CA2084501C - Video logging system having remote power source - Google Patents
Video logging system having remote power sourceInfo
- Publication number
- CA2084501C CA2084501C CA002084501A CA2084501A CA2084501C CA 2084501 C CA2084501 C CA 2084501C CA 002084501 A CA002084501 A CA 002084501A CA 2084501 A CA2084501 A CA 2084501A CA 2084501 C CA2084501 C CA 2084501C
- Authority
- CA
- Canada
- Prior art keywords
- support cable
- instrument probe
- cable
- instrument
- seal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- 239000013307 optical fiber Substances 0.000 claims abstract description 51
- 239000004020 conductor Substances 0.000 claims abstract description 48
- 239000012530 fluid Substances 0.000 claims abstract description 29
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 6
- 239000010935 stainless steel Substances 0.000 claims abstract description 6
- 238000007689 inspection Methods 0.000 claims description 21
- 230000003287 optical effect Effects 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 12
- 230000000007 visual effect Effects 0.000 claims description 5
- 238000011179 visual inspection Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
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- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4415—Cables for special applications
- G02B6/4427—Pressure resistant cables, e.g. undersea cables
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/002—Survey of boreholes or wells by visual inspection
- E21B47/0025—Survey of boreholes or wells by visual inspection generating an image of the borehole wall using down-hole measurements, e.g. acoustic or electric
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
- E21B47/135—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency using light waves, e.g. infrared or ultraviolet waves
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4415—Cables for special applications
- G02B6/4416—Heterogeneous cables
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
- E21B47/017—Protecting measuring instruments
Abstract
An instrument probe (12) contains a camera (38) and light source (28) which is positioned in front of the camera for illumi-nating the passage (14) being inspected, such as a bore or a casing.
The power source for the instrument probe is located at the sur-face. A support cable (16) contains an optical fiber (50) for con-ducting camera signals to the surface and electrical conductors (54, 60) for conducting power from the surface to the instrument probe.
Outer electrical conductors (60) in the cable are alternating with and in electrical contact with strength member strands (58). The cable is enclosed in a stainless steel outer sheath (62). The support cable is coupled to the instrument probe by three fluid seals (64, 73, 76). The first (64) seals the outer sheath in the probe. The sec-ond (73) seals at the breakaway connection and the third (76) seals at the probe bulkhead (74).
The power source for the instrument probe is located at the sur-face. A support cable (16) contains an optical fiber (50) for con-ducting camera signals to the surface and electrical conductors (54, 60) for conducting power from the surface to the instrument probe.
Outer electrical conductors (60) in the cable are alternating with and in electrical contact with strength member strands (58). The cable is enclosed in a stainless steel outer sheath (62). The support cable is coupled to the instrument probe by three fluid seals (64, 73, 76). The first (64) seals the outer sheath in the probe. The sec-ond (73) seals at the breakaway connection and the third (76) seals at the probe bulkhead (74).
Description
~WO 91/19~ 2 0 g fl ~ ~ 1 Pcr/US9l/03485 VIDEO LOGGrNG SYSTEM HAVlNG REMOTE POWER SOURCE
BACKGROUND
t . The invention is related generally to the remote viewing of well bores and other lirnited accecs areas, OEnd more pOEticulOEly, to an apparatus having a cOEnera for remotely viewing the condi~ion of such limited access OEeas.
There has long been a need in the field of well bonng to visually ex~,..;..e the bore hole to ~,.,..i..e geological formations or for other reasons. Where those well bores have ~cings and fittingc7 there is a ccmtinlling need to incpect the c~Cingc OEnd fittingc for corrosion OEnd other conditions. By means of visual inspection, the 10 locations of leaks and points of infiltration can be more easily i~lPn~ifi~
One ~xicting method of ~cco..~l,liching this is to insert an instrument probe cont~ining a camera, such as a closed circuit television camera, in the bore hole and move it through the area to 15 be inspected. Typically, a cc ~ t, rugged i~ lent cont~ining the camera and a light source is provided as an ~lsLI~Ilent probe. A
cable is attached between the instrument probe and the surface st~ation to commun;cate camera signals to the surface from the instmment probe. In one technique, the co.. l.. ic~tion link 20 comrriceC optical fibers. Where the bore is vertical, gravity can be used to pull the ~ llent probe Ll.~ ,L the bore hole. The support cable collt~inc strength members which preserve the integnty ~t WO 91/19884 : .- 2 0 8 ~ 5 0 1 Pcr/usgl/o3485 ~
. 2 of the cable as it and the il~ t probe are being pulled from the bore hole.
Optical fibers offer certain advantages in comml.nication systems. They are relatively immlln~o to electrom~gn~qtic intelÇëienlce, they have relatively low cable weight, they have a large bandwidth, high frequency video signals can be L~ ...;tt~-l over long lengths of cable with ~.-;--;-.-~m ~tt~nn~tiQn and they have lower cost. Thus they are 1~sit~hle in a remote logging instrument probe such as that used to view bore holes. Ho~N~v~, optical fibers are sensitive to 10 point stresses and bPntling. T~e fiber may impart signifir~nt ntl~tion to its conducted signal when bent. The cable system of a well logging instrument is lepeat~bly pulled around at least one sheave and wound on and off a winch drum as it is lowered into and lifted out of bore holes. The cable must withstand repeated bending 15 and tensions of thousands of pounds. Stretching the cable can stretch the optical fibers thereby increasing their stress and aggrava~ing their ~ttPnll~tion. High pressures and high temperatures in the well holes may assist moisture in invading the cable and the optical fibers.
Moisture invading the optical fiber through micro-cracks can increase 20 its ~ ml~hon and reduce its strength. Thus, the cable csnn~cttng the insL,ull,ent probe with the remote controller must protect the optical fibers as well as be strong enough to withstand repeated ben~ing about sheaves and a winch drum, withstand ~ tf~ g forces and the high temperatùres and plëSSul~;S in the bore hole.
A logging instrument probe for well holes must be rugged to withstand the sometim~ harsh conditions encountered in typical operation. For example, hydrostatic well p~SSl~eS in excess of 4.Z
x 10~ kilo~ s per square meter (6,000 pounds per square inch) and ambient wall temperatures of up to and above 190C (375F) are not 30 ~ ol,.on The point where the support cable enters the instrument probe must have effec~ve seals to deflect such high i ~
~ . .
~WO 91/19884 2 0 ~ PCr/US91/03485 pressure/temperature fluids from entering. The main purpose of such seals is to protect the camera, the optical fibers and the Pl~ctric~l co~ntoctions from the fluids present in the bore hole. Such seals have been ~lifflclllt to m~nllf~cture on a repe~t~hle basis and make the S instrument probe very ~:A~el~ivt: as well as unreliable. Thus, it would be desirable to provide an eC~ seal arrangement which can be m~nllf~ctured on a repe~t~ble basis and which uses st~ncl~rd parts readily available thereby lowering the cost of the seal.
Another coInmon con-lition in bore holes is turbidity in the form 10 of gases, mud, oil, and other fluids under high pressure. In prior te~hniques, high int~ncity li~hting such as that provided by quartz larnps or halogen lamps, is provided to give bright light in the visible range for use with collvrl.lion~l television cameras. Depending upon the amount of turbidity, higher intensity light from the lamps may be 15 required to provide clear images.
In order to provide power for such lamps and for the camera and other equipment, well bore inspection instrllm~ntC carry a self-cont~in~-l power supply, typically battery packs. In ~ irion to adding weight and bulk to the ~LLu~l-ent probe, these battery packs 20 have a limited life which is di~e-Lly dependent upon the int~ncjty of the lights. As an example, many battery packs of the size which can fit in a bore hole logging insL~ lent probe can provide power for orlly 3 to 31/2 hours when used with halogen lamps. Upon tlics;~t;nn of the stored energy, the baLL~y- packs must be removed and replaced 25 with charged batteAes or a charging ~rocess must occur which may take many hours. This usually requires that the instrument probe be removed from the well hole, dis-~cs~mhled and re-~csemhled. This can be a time consuming pr~,cLss which subjects the support cable of the ~L~ ellt probe to the added ~L~esses of being pulled over the 30 sheave and wound on the dn~n an additional ~ime.
20845 ~
W O 91il9884 PC~r/US91/03485 To the inventor's knowledge, remotely locating a power source has up until this time not been practical in an application where a small di~m~ter optical fiber is employed in the support cable having the extremely long lengths l~:qu~t:d for deep well holes. The power source has been inrb-~le-~ in the ~ lent probe itself. This co-location of power source with il~L~ulllL~It probe was caused by the long lengths of cable re~luiled for use in deep well bores. In prior cables, the steel strength members of the cable were used as part of the ,ol~rtrir~lly conductive path. Typically, the strength members are made of steel which has a relatively high specific resistance, and therefore a low resistive loop circuit was not available to carry the required current at an acceptable working voltage. The diameter of the strength members was increased to result in less resistance;
however, even with this technique, the loop resistance was relatively high and the increased size of the strength members resulted in a large cable with the associ~te~l disadvantages of high weight and buLk. Additionally, such strength members were used to form the outer surface of the cable, thus m~king it rough and more difficult to h~ndl~
Hence, it would be desirable to provide an improved power arrangement so that the power source for the well logging instrument probe could be remotely located from the probe, such as at the surface, yet impracticably large voltages would not be Le~ d in order to get the required power over the typically long rlict~nr~o between the surface and the probe. Additionally, it would be desirable to provide a smaller support cable and a support cable having a smooth outer surface to farilit~te h~ndling, yet one having the required ~ n~ tio~lly, those concellled with insL.~ll,len~
probes for use in viewing bore holes and casing have recognized the need for an improved sealing system to keep fluids from ~nt~nng the 20~;S0~
~Wo 91/19884 Pcr/US91/03485 s probe which can be manufactured on repeatable and economical bases. The invention fulfills those needs.
SUMMARY OF THE ~NVENT~ON
5Briefly and in general terms, the present invendon provides a video logging inspectdon system with an instrument probe having ruv~d sealing and a remotely located power source. ~n one embotlim~nt, the ins~ument probe comprises a closed circuit television camera and an opdcal fiber or fibers are used to conduct 10the camera signals to the surface for remote viewing. A light source is placed forward of the camera for illllmin~ting the walls of the bore hole, casing and fitdngs. Three moundng bars are used to firmly extend the light source forward of the camera lens and protect the electrical power cables powering the lights. The length of the bars 15is selected in dependence upon the inner diameter of the bore hole or casing.
The power source for both the camera and the light source is located at the surface. Power is conducted to the components in the instrument probe through a muld-conductor support cable having the 20optical fiber, the electrical conductors and the strength members all enclosed in a smooth outer sheath which in one embodiment is made of stainless steel. The outside sheath is thin enough so that it may be routinely pulled around sheaves and rolled on the winch drum for L~ s~olL yet is strong enough to protect the inner conductors and 25strength members. The support cable has the optical fiber located in the center and a buffer m~t~on~l surrounding the optical fiber.
Next is a layer of inner power conductors which are su~loullded by a layer of ins~ inn Next is a layer of strength members alt~ ting with outer electrical conductors. Surrounding this layer is insulation 30and surrounding this and all layers is the outer sheath of the cable.
wo 91/19884 2 0 8 4 5 0 I Pcr/Usgl/03485 ~n order to prevent fluids from entering the inshument probe along the support cable entry point, a multiple seal arrangement has been provided. ~n one emboflimpnt~ the sealing arrangement comprice~ three seals. The first seal co~ lises flexible material such as multiple "O-rings" colll~les~ed around the Su~O~l cable at the end of the instrument probe where the support cable enters. The second seal is formed in conjunction with the breakaway conn~ction. A
strengh tube is placed over a sechon of the cable, the outer sheath removed thereafter and the sh-ength members and outer el~crrir~l con~lnctors are bent back over the tube. A fluid resistant, adhesive cauLking m~t~n~l such as epoxy is applied to the bent-back strength members and outer conductor strands. A bl-lkhP~tl tube, which is rigidly connected to the bl-lkhe~rl, is then mounted over the bent-back strength members and conductors. Enough epoxy is used to fill the gaps between the strands and to also fill the buLtchead tube around the cable to the bl-lkhe~l The epoxy not only holds the strands in place but also provides a fluid seal. The blllkh~l tube makes electrical co~t~ct with the bent back ~lectn~l conductors to establish an electrical path.
The third seal is formed at the blllkh~ of the instrument probe. A threaded co~ ression coupler is screwed at one end into the bnlkh~ The threads used for the blllkh~rl conn~c~ion are in one embo~lim~nt NPT pipe threads, thus providing a fluid seal. The rem~in~Pr of the support cable aess the already bent-back members) proceeds through the bulkhead tube and through the blllkh~-l A
metal sheath also cont~ining a fluid ~e~isL~lt, adhesive cau~cing m~tf~ri~l is mounted over this portion of the support cable and enters the co~ r~s~ion coupler at its other threaded end. A compression fit~ing slides over the metal sheath and a threaded co~ rês~ion nut is screwed onto the second threaded end of the compression co~n~ctor to coll~ress the coll~ples~ion fitting onto the metal sheath thus forming a fluid seal at the bulkhead. The epoxy forms an internal fluid seal at the bulkhead while the compression fitting forms an external seal.
Because the power source is located at the surface, no battery packs are needed in the instrument probe and it can be used for much greater time periods for observation of the conditions of the bore hole, the casing and the fittings. A support cable provides not only the optical fiber support and strength members but also the power transmission means necessary to operate the camera and lights and other equipment in the instrument probe. The triple seal of the cable in the instrument probe provided by the invention assures protection of the instrument probe equipment and is easily and relatively inexpensively provided.
Other aspects of this invention are as follows:
An inspection system for inspecting the condition of an elongated passage with an instrument probe for placement in the passage, the instrument probe comprising a camera for generating images of the passage and providing signals representative of those images, the system having a surface unit located near the entrance to the passage, the surface unit comprising a controller and a power source; a support cable connected between the instrument probe and the surface unit and having: an optical fiber along which the camera signals are conducted to the controller; a plurality of electrical conductors connected between the power source of the surface unit and the instrument probe which provide power to the instrument probe; and a plurality of strength members being connected between the surface unit and the instrument probe and disposed in electrical contact with the electrical conductors; and sealing means for sealing the instrument probe against external fluids at a connection of the support cable to the instrument probe.
s -5 .~
~ - 7a - 2084501 A communication and power cable comprising an optical fiber and electrical conductors, the optical fiber being located substantially at the center of the cable; a first layer of electrical conductors; a second layer of electrical conductors separated from the first layer; and strength members which are in electrical contact with and are alternating with the electrical conductors of the second layer.
A down-hole inspection system for the remote visual inspection of the condition of an elongated passage, comprising:
a down-hole instrument for plac~nt in the elongated passage for performing the visual inspection of said passage, said instrument comprising a non-articulated body being sealed against the entry of pressurized external fluid into the instrument and configured so that gra~itational forces are required to move the instrument downwardly through the elongated passage, the non-articulated body having a first end, the body comprising:
a television camera for rendering the visual imagery of the passage into corresponding electrical image signals representative of that visual imagery; and an electrical-to-light transducer for converting the electrical image signals into optical image signals;
a support cable having a first end and a second end, the first end connected to the first end of the down-hole instrument so as to support the entire weight of the instrument, the support cable having at least one optical fiber, the optical fiber operative to receive the optical image signals from the electrical-to-optical transducer and conduct said optical image signals to the second end of the cable; and surface equipment located outside the passage, the surface equipment comprising:
a controllable actuator coupled to the support - 7b - 20~50 1 cable to control the position of the support cable and oppose the gravitational forces acting on the instrument thereby controlling the position of the instrument in the passage; and a processor coupled to the optical fiber at the second end of the support cable to receive the optical image signals, the processor having an optical-to-electrical transducer for converting the optical image signals from the optical fiber into corresponding electrical image signals.
These and other objects and advantages of the invention will become apparent from the following more detailed description when taken in conjunction with the accompanying drawings of illustrative embodiments.
BRI~F D~-~CRIPTIO~ ~F T~ DRAWINGS
FIG. 1 is an overall block diagram of a well logging system according to the present invention;
FIG. 2 is a side view ,of an instrument probe which is in place in a well bore showing a part of the support cable, cable head, camera section and the light section;
FIG. 3 is a partial cross-sectional side view of part of the camera section of the probe showing the camera, cabling, power distribution section, fiber optic transmitter section, lens and mounting points of the support legs used to hold the light section in front of the lens of the camera;
.,~, wo gl/l9884- - ~ 2 0 8 ~ 5 0 1 PCI~/US91/03485 ~
FlG. 4 is a partial cross-sectional view of the light section of the instrument probe showing a halogen lamp and the legs and molmtin~;
FlG. 5 is a cross-sec~on~l view of a ~u~pGll cable in accordance with the prin~irl~s of the invention;
FIG. 6 is a partial cross-sectional view of the cable head showing the three seals of the support cable and the instrument probe in accordance with the invention; and FIG. 7 is an exploded view of the third seal in accordance with the principles of the invention.
DESCRIPTlON OF THE PREFERRED EMBOD~MENTS
In the following description, lLce reference numerals will be used to refer to like or collesl,onding ~l~m~nts in the different figures of the drawings. Refernng now to the drawings with more particularity, in FlG. 1 there is shown a well logging system 10 comprising a well bore instrument probe 12 which has been lowered into a well bore 14, a ~up~o~L cable 16, a sheave 18, a rotatable winch drum 20, a surface controller 22, a controller enclosure 23 and a transportable platform 24 which in this case is a skid unit.
One end of the support cable 16 is wound on the drurn 20 which supports the cable 16 for raising and lowering it in~o the bore 14 as the drum is rotated. The surface controller 22 controls the operation of the winch and the probe 12 and receivt:s and processes inforrs~ion provided by the probe 12. The control enclosure 23 may inr~ a recorder, such as a video tape recorder, for l~cordLlg the informaion provided by the probe 12.
Referring now to FlG. 2, an L~~ Ient probe 12 is shown in greater detail and is presently disposed in a bore 14. The support cable 16 is connected to the probe 12. T~e probe 12 has three sec~ion~, a cable head 25, a camera head 26 and a light head 28.
-2 0 8 ~
WO 9l/19884 PCr/US9l/03485 The light head 28 is attached to the camera head 26 through three legs 30, two of which are shown. Legs of different lengths may be used depending upon the inner ~ met~r of the bore 14 or casing.
The larger the inner diarneter, the longer the legs should be so as to not illtelrele with the camera viewing angle.
Referring now to FIG. 3, the camera head 26 part of the instrument probe 12 is preC~nte~ Section 32 of the cable 16 is coupled to the optical t~ r section 34. At this component, electric~l signals from the camera rep.esel,tillg camera irnages are converted into optical signals and coupled to an optical fiber disposed within the cable. The optical fiber is used for the tr~ncmiccion of the irnages to the surface. Flectri~l/optical COllYt~ are well known in the art as well as couplers for coupling the converter 34 to the optical fiber and no further details are given herein.
The next section in the carnera head 26 is the electrical section 36. The electrical power brought into the instrurnent probe 12 by the cable 16 is coupled to this section where the olectTic~l power is converted into the voltages ~etle~l by the camera, the light and the electrical/optical collv~lLer. For example, the voltage supplied by the cable 16 may be 100 Vdc while the camera opOEates on 12 Vdc and the light on 50 Vdc. The ~lectri~l/optical converter may require 12 Vdc. Such cul~v~Ler boards are well known in the art, for example, Model SWA175-4300 by Power-One, Inc., C~mm~nllo, California.
The next section in the camera head 26 is the camera 38 itself.
In one embo~lim~n~, the camera was a charge coupled device (CCD) type television camera which is capable of providing high speed, high resolution images in relatively & light. One camera found to be usable in an embodiment is the CCD Video Camera Module having a model number ûf XC 37 made by Sony Corporation. Coupled to the camera is a lens 40 which in one embodiment was a fisheye lens, and a quartz window 42. The window 42 seals the camera head 26 at WOgl/19884 ~ PCr/US91/03485 its bottom end and protects the lens 40 against high pressure/high temperature fluids which may exist in the well bore. Its angle is selected so as to not obstruct the viewing angle of the lens 40. Also shown in F~G. 3 is part of the legs 30 which are welded to the 5 camera head 33 in this embodiment and which hold the light head 44 in positiorl in front of the lens 40. The electrical corl~ to~s 48 are separately routed through the legs to the light head. In the embo-iim~nt shown, three legs were used although only two legs are shown in this figure.
Referring now to F~G. 4, the light head 28 is shown having a halogen lamp 46. The light head 28 is attached to the camera sect;on by legs 30 which are also welded into the light head 28 in this emborlimPnt The length of the legs is selected based on the inner rli~mpt~r of the bore or casing. Where the camera must see further because of a larger inner diameter of the casing, the legs 30 are made longer so that the light head will not obstruct the view of the lens. Where the inner fii~meter is small, the legs may be shorter so that more light is placed within the camera viewing angle. Thus, several different light heads with varying lengths of legs may be required. F.lectric~l power conductors 48 which provide .olectric~l power to the light traverse one or more of the legs 30. Other light sources may be used such as in~n~l~s~nt lamps. Additionally, light other than visible light may be used, for example, infrared and ultraviolet.
In accordance with the invention, power for the ilL~hu~llent probe 12 resides at the surface at the controller 22. In one embo~iment, the power source at the controller 22 is L~ lll;tte-l to the support cable 16 via slip rings at the drum 20 in accordance with techniques known to those skilled in the art.
~n order to conduct the n~c~ss~.~y power over the long distances comm~ nly experienced by video logging systems, a multi-layer cable 2 0 8 tI ~
WO 91/19884 PCI/US9lt03485 11 .
is provided. Referring now to F~G. 5, a cross-sectional view of a cable in accordance with the invention is presented. Disposed at the center is the optical fiber 50 and imm~ t~oly around it is a buffer layer 52. Although only a single optical fiber is shown in this 5 embollim~nt, mtlltiple fibers may be used to comprise a fiber optic cable. The buffer layer 52 provides m~h~nic~l iCol~tion Surrounding the bùffer layer 52 and co~ l therewith is an inner layer of electrically conductive strands 54 which in one embodiment are formed of copper. These strands form a power conductor which 10 conducts power from the controller 22 to the instrument probe colll~onents. Surrounding the power conductor 54 is a layer of insulation 56 and surrounding the insulation is a layer comprising strength member strands 58 alten~ting with outer, f~lectric~lly conductive strands 60. In this embo-liment, one outer conductive 15 strand 60 is interspaced with two strength member strands 58.
To b~l~nce the resistance of the power conductors 54 with the resistance of the strength members 58 which also serve as one leg of the resistive loop, ten outer electrically conductive strands which in one embodiment are formed of copper, are alternately interspaced 20 in the total of thirty strands in the layer. The power conductor resistance when formed of copper strands is 6.1 ohms per 305 melers (1000 feet). The twenty steel and the ten copper resistive loop strands have a resistance of 18.1 ohms per 305 m (1000 ft). l~us, the loop resistance is 24.2 ohms per 305 m (1000 ft). Because of 25 this arrangement of ~It~t~ly interspaced copper and steel strands, the loop resistance is lowered. The diameter of the strength members then may be stqlecterl to satisfy only strength concerns rather than both strength and electrical conductivity concerns. It has been found that in a cable in accordance with the invention, the strength 30 members are significantly cm~llP~ thus resulting in a much s~ ler wo 91/19884 2 0 8 4 5 0 1 Pcr/us9l/o3485 and lighter support cable yet one with loop resistance low enough so that a manageable voltage may be used at the surface.
~n one embotlim~nt, the optical fiber used was a 50/125/245 multi-mode fiber with a buffer formed of Hytrel which is available from Dupont in Wilmington, Delaware. The optical fiber had a 0.050 mm core with 0.125 mm rl~ ing. The Hytrel buffer was 0.18 mm (0.007 in.) in average thi~knPss. The power con~ Ls~ls were 0.38 - mm (0.015 in.) in diameter and were formed of copper HDBC, the insulator was 0.48 mm (0.019 in.) in thickn.ocs, and each strength member and resistive loop conductor was 0.25 mm (0.010 in.) in ~i~m~ot~r. The insulahon was compounded Hytrel and the strength strands were formed of i~ ov~d plow steel.
Surrounding all of the above members is an outer sheath 62 which in one embo-lim~nt, is made of st~inl~cs steel sheet having a thickness of 0.20 mm (0.008 in.). In one emborlim~nt, the st~inl~s steel sheet was formed into a tube shape and welded lengthwise to form the outer ch~th The st~inl~sc steel is strong and fluid resistive thus protecting the internal components. rt was found that forming the outer sheath of st~inl~cs steel provides a smooth outer surface .20 thus f~rilit~ting its movement in pressure sealing glands and around sheaves and drums. Because it is relatively thin, it can be rolled on the sheaves and drums as n~c~s~
Because of the commo~ly-exp~ nre~l high p~ s of fluids found in bores, the cable entry point into the i~ lent probe 12 must be sufficiently sealed to protect against the entry of extraneous fluids. ~n accordance with the invention, a series of three fluid seals is provided. Each seal is formed of col~ ol~ly available parts thus being eco~omir~l to provide.
Refemng now to F~G. 6, mounted at the cable head 25 is the first seal 64. ~t comprises a co~ lesaiv~ type seal using flexible m~t~n~lc such as ordinary "O-rings." ~n this embo~liment, three O-208~5~1 WOsl/l9884 . PCI/US9l/03485 rings are used and are coll.pl~ssed onto the outer cable sheath 62 as it enters the instrument probe. Two of these O-rings 66 comprise metal washers which have rubber seals inserted within them. These are comm~ nly called Parker "Thread Seals" or "Stat-O-Seals" and are S available from Parker Seals, Culver City, CaliforIua. The third O-ring 68 is a collvt:lltional O-ring inserted between the two Parker thread seals.
ReÇellillg now to FIGS. 6 and 7 for a des.li~tion of the second seal, the outer sheath 62is t~ terl and a length of tubing 71 is 10 mounted on a s~lPcte~l length of the outer sheath 62 ad3acent the tPnnin~tion point. The steel strength members 58 and outer conductors strands 60 are folded back over the tubing 71. The optical fiber, buffer, power conductor strands and insulation are not folded back. The folded back strands are then coated liberally with 15 a fluid resistant a&esive caulking material 73 such as that sold as Tri-con #230 epoxy made by Tri-Con, Inc. of 55 North Street, Medford, Massachusetts. After co~ting with epoxy, an outer blllkhP~tl tube 72 is placed over the folded back strands. As is well known in the art, the number of strands folded back and their lengths 20 detell,.ule the break-away force r~uired for the cable to be separated from the il~Llul~lent probe 12. By sPlPcting the number and length of the bent back strength members, the force may be set so that if the instrument probe 12 should become stuck in a bore or casing for some reason, the cable may be pulled out of the instrument probe 25 and then the instrument probe can be reco~ed by other m~n.C. In the event that a reduced breakaway force is required, some of the strength members may be cut but not folded back.
The b-llkhP~tl tube 72 makes electncal contact with the bent back members thus putting the b~llkhe~(l tube 72 and b--lkh.o~l 74, 30 to which the tube is joined, in the electrical return path.
Additionally, in the embodiment shown, the length of cable covered WO 91/19884 ~ Q ~ ~ 5 ~ 1 Pcr/US9l/03485 by the blllkh~ tubing 72 is also coated with the cauLking 73 so that all parts of the cable covered by the bl.lkhe~3 tubing 72 are coated. Upon set~ng, the adhesive cauLtcing 73 will hold the au~pOlL
cable in position inside the bl.lkh~.l tubing as well as provide a fluid seal. In the event that ~l~atL, ~l~ctnr~l conductivity is rt:qu~ed, an Plectn-~lly cond-lcLiv~ epoxy may be used.
Refe~ing now more particularly to FIG. 7, welded to the other end of the bu~head tube 72 is a blllkhe~ 74. As show~ it has fluid seals 75 on its outer surface. A threaded bore is formed through the bnlkh~ 74 for pl~c~m~nt of the third seal 76. Mounted in the threaded bore and comprising part of the third seal is a co~ re~ion coupler 78. The coupler 78 has NPT pipe threads formed on its end which is connected to the btllkh~(l thus fo~ning a fluid seal. The other end of the coupler is shaped to accept a coll,pres~ion fitting and a co~ re~ion nut for col"plt:s~ing the fitting.
In the third seal, a col,lpres~ion sheath 80 also having a fluid resistant, a&esive cauL~ing material placed inside is mounted over the r.om~intl~r of the support cable which proceeds through the buLkhead. In one embo~lim~ont, a col~l~lession sheath 80 formed of brass tubing having a 3.2 mm (0.125 in.) outer fli~m~rer by 2.3 mm (0.090 in.) inner ~i~m~t~r. Placed over the colll~le~sion shearh 80 is a-colllp~es~ioll fitting 82 and placed over the fitting 82 is a conlpl~s~ion nut 84. As the cu~ ression nut 84 is turned OlltO the coupler 78, the colllplession fitting 82 is forced into closer contact with the colllpression sheath 80 thereby fo~r~ing a fluid tight seal.
The con.~es~ion fit~ing 82, nut 84 and coupler 78 are all st~n~l~rd "plnmhing' parts which are commonly av~ le Thus by use of the three seals, the cnnn~oc~ion of the ~ulJ~oLL
cable with the i~ ent probe 12 is made fluid tight for use in high ~ s~ ri~u~nllentc Additionally, because all of the seals WO 91/19884 ~ 0 8 4 ~ ~) 1 PCI/US91/03485 are made of standard componPntc~ the three seals are economical to provide and m~nllf~cturing on a repP~r~hle basis is f~rilit~te~l Past the third seal, a co~t~ct 86 is formed on the co~ ression sheath 80. Because the cG~ es~ion sheath 80 is in physical and 5 ~l~ctrir~l contact with other third seal parts which are in ~lPctnt~l contact with the b-llkh~ 74 which is in ~l~ctri~ ~l contact with the b--lkh~l tube 72 which cont~ct~ th~e folded back steel strength members 58 and outer conductor strands 60, a potential is made available at the contact 86 as in~liC~te~l by the t~rmin~l symbol. Past 10 this cont~ct, the power con~lctors 54 are folded back to make a second potential available. Past this point, the optical fiber 50 CQ~timl-oc.
Thus, in accordance with the invention, a new and useful inspection system is provided having the power source for the 15 instrument probe located at the sl~ e rather than in the instrument probe itself. The design of the su~po~ cable results in lower loop r~ ce thus allowing a sm~ r cable and a more manageable supply voltage at the surface. Additionally, a smooth yet strong outer sheath on the cable makes it easier to handle yet it provides 20 protection for the int~orn~l cable colu~lents. The fluid seals are relatively ~imI~le, easy to impl~m.ont, lower in cost and can be r~ctured on a repe~t~hle basis.
rt will be ~ lt from the f~ e~oil~g that, while particular forms of the invention have been illustrated and described, various 25 mo-lifi~tiQns can be made without depamng from the spirit and scope of the invention. Acco~ lgly, it is not intended that the invention be limitefl, except as by the appended claims.
BACKGROUND
t . The invention is related generally to the remote viewing of well bores and other lirnited accecs areas, OEnd more pOEticulOEly, to an apparatus having a cOEnera for remotely viewing the condi~ion of such limited access OEeas.
There has long been a need in the field of well bonng to visually ex~,..;..e the bore hole to ~,.,..i..e geological formations or for other reasons. Where those well bores have ~cings and fittingc7 there is a ccmtinlling need to incpect the c~Cingc OEnd fittingc for corrosion OEnd other conditions. By means of visual inspection, the 10 locations of leaks and points of infiltration can be more easily i~lPn~ifi~
One ~xicting method of ~cco..~l,liching this is to insert an instrument probe cont~ining a camera, such as a closed circuit television camera, in the bore hole and move it through the area to 15 be inspected. Typically, a cc ~ t, rugged i~ lent cont~ining the camera and a light source is provided as an ~lsLI~Ilent probe. A
cable is attached between the instrument probe and the surface st~ation to commun;cate camera signals to the surface from the instmment probe. In one technique, the co.. l.. ic~tion link 20 comrriceC optical fibers. Where the bore is vertical, gravity can be used to pull the ~ llent probe Ll.~ ,L the bore hole. The support cable collt~inc strength members which preserve the integnty ~t WO 91/19884 : .- 2 0 8 ~ 5 0 1 Pcr/usgl/o3485 ~
. 2 of the cable as it and the il~ t probe are being pulled from the bore hole.
Optical fibers offer certain advantages in comml.nication systems. They are relatively immlln~o to electrom~gn~qtic intelÇëienlce, they have relatively low cable weight, they have a large bandwidth, high frequency video signals can be L~ ...;tt~-l over long lengths of cable with ~.-;--;-.-~m ~tt~nn~tiQn and they have lower cost. Thus they are 1~sit~hle in a remote logging instrument probe such as that used to view bore holes. Ho~N~v~, optical fibers are sensitive to 10 point stresses and bPntling. T~e fiber may impart signifir~nt ntl~tion to its conducted signal when bent. The cable system of a well logging instrument is lepeat~bly pulled around at least one sheave and wound on and off a winch drum as it is lowered into and lifted out of bore holes. The cable must withstand repeated bending 15 and tensions of thousands of pounds. Stretching the cable can stretch the optical fibers thereby increasing their stress and aggrava~ing their ~ttPnll~tion. High pressures and high temperatures in the well holes may assist moisture in invading the cable and the optical fibers.
Moisture invading the optical fiber through micro-cracks can increase 20 its ~ ml~hon and reduce its strength. Thus, the cable csnn~cttng the insL,ull,ent probe with the remote controller must protect the optical fibers as well as be strong enough to withstand repeated ben~ing about sheaves and a winch drum, withstand ~ tf~ g forces and the high temperatùres and plëSSul~;S in the bore hole.
A logging instrument probe for well holes must be rugged to withstand the sometim~ harsh conditions encountered in typical operation. For example, hydrostatic well p~SSl~eS in excess of 4.Z
x 10~ kilo~ s per square meter (6,000 pounds per square inch) and ambient wall temperatures of up to and above 190C (375F) are not 30 ~ ol,.on The point where the support cable enters the instrument probe must have effec~ve seals to deflect such high i ~
~ . .
~WO 91/19884 2 0 ~ PCr/US91/03485 pressure/temperature fluids from entering. The main purpose of such seals is to protect the camera, the optical fibers and the Pl~ctric~l co~ntoctions from the fluids present in the bore hole. Such seals have been ~lifflclllt to m~nllf~cture on a repe~t~hle basis and make the S instrument probe very ~:A~el~ivt: as well as unreliable. Thus, it would be desirable to provide an eC~ seal arrangement which can be m~nllf~ctured on a repe~t~ble basis and which uses st~ncl~rd parts readily available thereby lowering the cost of the seal.
Another coInmon con-lition in bore holes is turbidity in the form 10 of gases, mud, oil, and other fluids under high pressure. In prior te~hniques, high int~ncity li~hting such as that provided by quartz larnps or halogen lamps, is provided to give bright light in the visible range for use with collvrl.lion~l television cameras. Depending upon the amount of turbidity, higher intensity light from the lamps may be 15 required to provide clear images.
In order to provide power for such lamps and for the camera and other equipment, well bore inspection instrllm~ntC carry a self-cont~in~-l power supply, typically battery packs. In ~ irion to adding weight and bulk to the ~LLu~l-ent probe, these battery packs 20 have a limited life which is di~e-Lly dependent upon the int~ncjty of the lights. As an example, many battery packs of the size which can fit in a bore hole logging insL~ lent probe can provide power for orlly 3 to 31/2 hours when used with halogen lamps. Upon tlics;~t;nn of the stored energy, the baLL~y- packs must be removed and replaced 25 with charged batteAes or a charging ~rocess must occur which may take many hours. This usually requires that the instrument probe be removed from the well hole, dis-~cs~mhled and re-~csemhled. This can be a time consuming pr~,cLss which subjects the support cable of the ~L~ ellt probe to the added ~L~esses of being pulled over the 30 sheave and wound on the dn~n an additional ~ime.
20845 ~
W O 91il9884 PC~r/US91/03485 To the inventor's knowledge, remotely locating a power source has up until this time not been practical in an application where a small di~m~ter optical fiber is employed in the support cable having the extremely long lengths l~:qu~t:d for deep well holes. The power source has been inrb-~le-~ in the ~ lent probe itself. This co-location of power source with il~L~ulllL~It probe was caused by the long lengths of cable re~luiled for use in deep well bores. In prior cables, the steel strength members of the cable were used as part of the ,ol~rtrir~lly conductive path. Typically, the strength members are made of steel which has a relatively high specific resistance, and therefore a low resistive loop circuit was not available to carry the required current at an acceptable working voltage. The diameter of the strength members was increased to result in less resistance;
however, even with this technique, the loop resistance was relatively high and the increased size of the strength members resulted in a large cable with the associ~te~l disadvantages of high weight and buLk. Additionally, such strength members were used to form the outer surface of the cable, thus m~king it rough and more difficult to h~ndl~
Hence, it would be desirable to provide an improved power arrangement so that the power source for the well logging instrument probe could be remotely located from the probe, such as at the surface, yet impracticably large voltages would not be Le~ d in order to get the required power over the typically long rlict~nr~o between the surface and the probe. Additionally, it would be desirable to provide a smaller support cable and a support cable having a smooth outer surface to farilit~te h~ndling, yet one having the required ~ n~ tio~lly, those concellled with insL.~ll,len~
probes for use in viewing bore holes and casing have recognized the need for an improved sealing system to keep fluids from ~nt~nng the 20~;S0~
~Wo 91/19884 Pcr/US91/03485 s probe which can be manufactured on repeatable and economical bases. The invention fulfills those needs.
SUMMARY OF THE ~NVENT~ON
5Briefly and in general terms, the present invendon provides a video logging inspectdon system with an instrument probe having ruv~d sealing and a remotely located power source. ~n one embotlim~nt, the ins~ument probe comprises a closed circuit television camera and an opdcal fiber or fibers are used to conduct 10the camera signals to the surface for remote viewing. A light source is placed forward of the camera for illllmin~ting the walls of the bore hole, casing and fitdngs. Three moundng bars are used to firmly extend the light source forward of the camera lens and protect the electrical power cables powering the lights. The length of the bars 15is selected in dependence upon the inner diameter of the bore hole or casing.
The power source for both the camera and the light source is located at the surface. Power is conducted to the components in the instrument probe through a muld-conductor support cable having the 20optical fiber, the electrical conductors and the strength members all enclosed in a smooth outer sheath which in one embodiment is made of stainless steel. The outside sheath is thin enough so that it may be routinely pulled around sheaves and rolled on the winch drum for L~ s~olL yet is strong enough to protect the inner conductors and 25strength members. The support cable has the optical fiber located in the center and a buffer m~t~on~l surrounding the optical fiber.
Next is a layer of inner power conductors which are su~loullded by a layer of ins~ inn Next is a layer of strength members alt~ ting with outer electrical conductors. Surrounding this layer is insulation 30and surrounding this and all layers is the outer sheath of the cable.
wo 91/19884 2 0 8 4 5 0 I Pcr/Usgl/03485 ~n order to prevent fluids from entering the inshument probe along the support cable entry point, a multiple seal arrangement has been provided. ~n one emboflimpnt~ the sealing arrangement comprice~ three seals. The first seal co~ lises flexible material such as multiple "O-rings" colll~les~ed around the Su~O~l cable at the end of the instrument probe where the support cable enters. The second seal is formed in conjunction with the breakaway conn~ction. A
strengh tube is placed over a sechon of the cable, the outer sheath removed thereafter and the sh-ength members and outer el~crrir~l con~lnctors are bent back over the tube. A fluid resistant, adhesive cauLking m~t~n~l such as epoxy is applied to the bent-back strength members and outer conductor strands. A bl-lkhP~tl tube, which is rigidly connected to the bl-lkhe~rl, is then mounted over the bent-back strength members and conductors. Enough epoxy is used to fill the gaps between the strands and to also fill the buLtchead tube around the cable to the bl-lkhe~l The epoxy not only holds the strands in place but also provides a fluid seal. The blllkh~l tube makes electrical co~t~ct with the bent back ~lectn~l conductors to establish an electrical path.
The third seal is formed at the blllkh~ of the instrument probe. A threaded co~ ression coupler is screwed at one end into the bnlkh~ The threads used for the blllkh~rl conn~c~ion are in one embo~lim~nt NPT pipe threads, thus providing a fluid seal. The rem~in~Pr of the support cable aess the already bent-back members) proceeds through the bulkhead tube and through the blllkh~-l A
metal sheath also cont~ining a fluid ~e~isL~lt, adhesive cau~cing m~tf~ri~l is mounted over this portion of the support cable and enters the co~ r~s~ion coupler at its other threaded end. A compression fit~ing slides over the metal sheath and a threaded co~ rês~ion nut is screwed onto the second threaded end of the compression co~n~ctor to coll~ress the coll~ples~ion fitting onto the metal sheath thus forming a fluid seal at the bulkhead. The epoxy forms an internal fluid seal at the bulkhead while the compression fitting forms an external seal.
Because the power source is located at the surface, no battery packs are needed in the instrument probe and it can be used for much greater time periods for observation of the conditions of the bore hole, the casing and the fittings. A support cable provides not only the optical fiber support and strength members but also the power transmission means necessary to operate the camera and lights and other equipment in the instrument probe. The triple seal of the cable in the instrument probe provided by the invention assures protection of the instrument probe equipment and is easily and relatively inexpensively provided.
Other aspects of this invention are as follows:
An inspection system for inspecting the condition of an elongated passage with an instrument probe for placement in the passage, the instrument probe comprising a camera for generating images of the passage and providing signals representative of those images, the system having a surface unit located near the entrance to the passage, the surface unit comprising a controller and a power source; a support cable connected between the instrument probe and the surface unit and having: an optical fiber along which the camera signals are conducted to the controller; a plurality of electrical conductors connected between the power source of the surface unit and the instrument probe which provide power to the instrument probe; and a plurality of strength members being connected between the surface unit and the instrument probe and disposed in electrical contact with the electrical conductors; and sealing means for sealing the instrument probe against external fluids at a connection of the support cable to the instrument probe.
s -5 .~
~ - 7a - 2084501 A communication and power cable comprising an optical fiber and electrical conductors, the optical fiber being located substantially at the center of the cable; a first layer of electrical conductors; a second layer of electrical conductors separated from the first layer; and strength members which are in electrical contact with and are alternating with the electrical conductors of the second layer.
A down-hole inspection system for the remote visual inspection of the condition of an elongated passage, comprising:
a down-hole instrument for plac~nt in the elongated passage for performing the visual inspection of said passage, said instrument comprising a non-articulated body being sealed against the entry of pressurized external fluid into the instrument and configured so that gra~itational forces are required to move the instrument downwardly through the elongated passage, the non-articulated body having a first end, the body comprising:
a television camera for rendering the visual imagery of the passage into corresponding electrical image signals representative of that visual imagery; and an electrical-to-light transducer for converting the electrical image signals into optical image signals;
a support cable having a first end and a second end, the first end connected to the first end of the down-hole instrument so as to support the entire weight of the instrument, the support cable having at least one optical fiber, the optical fiber operative to receive the optical image signals from the electrical-to-optical transducer and conduct said optical image signals to the second end of the cable; and surface equipment located outside the passage, the surface equipment comprising:
a controllable actuator coupled to the support - 7b - 20~50 1 cable to control the position of the support cable and oppose the gravitational forces acting on the instrument thereby controlling the position of the instrument in the passage; and a processor coupled to the optical fiber at the second end of the support cable to receive the optical image signals, the processor having an optical-to-electrical transducer for converting the optical image signals from the optical fiber into corresponding electrical image signals.
These and other objects and advantages of the invention will become apparent from the following more detailed description when taken in conjunction with the accompanying drawings of illustrative embodiments.
BRI~F D~-~CRIPTIO~ ~F T~ DRAWINGS
FIG. 1 is an overall block diagram of a well logging system according to the present invention;
FIG. 2 is a side view ,of an instrument probe which is in place in a well bore showing a part of the support cable, cable head, camera section and the light section;
FIG. 3 is a partial cross-sectional side view of part of the camera section of the probe showing the camera, cabling, power distribution section, fiber optic transmitter section, lens and mounting points of the support legs used to hold the light section in front of the lens of the camera;
.,~, wo gl/l9884- - ~ 2 0 8 ~ 5 0 1 PCI~/US91/03485 ~
FlG. 4 is a partial cross-sectional view of the light section of the instrument probe showing a halogen lamp and the legs and molmtin~;
FlG. 5 is a cross-sec~on~l view of a ~u~pGll cable in accordance with the prin~irl~s of the invention;
FIG. 6 is a partial cross-sectional view of the cable head showing the three seals of the support cable and the instrument probe in accordance with the invention; and FIG. 7 is an exploded view of the third seal in accordance with the principles of the invention.
DESCRIPTlON OF THE PREFERRED EMBOD~MENTS
In the following description, lLce reference numerals will be used to refer to like or collesl,onding ~l~m~nts in the different figures of the drawings. Refernng now to the drawings with more particularity, in FlG. 1 there is shown a well logging system 10 comprising a well bore instrument probe 12 which has been lowered into a well bore 14, a ~up~o~L cable 16, a sheave 18, a rotatable winch drum 20, a surface controller 22, a controller enclosure 23 and a transportable platform 24 which in this case is a skid unit.
One end of the support cable 16 is wound on the drurn 20 which supports the cable 16 for raising and lowering it in~o the bore 14 as the drum is rotated. The surface controller 22 controls the operation of the winch and the probe 12 and receivt:s and processes inforrs~ion provided by the probe 12. The control enclosure 23 may inr~ a recorder, such as a video tape recorder, for l~cordLlg the informaion provided by the probe 12.
Referring now to FlG. 2, an L~~ Ient probe 12 is shown in greater detail and is presently disposed in a bore 14. The support cable 16 is connected to the probe 12. T~e probe 12 has three sec~ion~, a cable head 25, a camera head 26 and a light head 28.
-2 0 8 ~
WO 9l/19884 PCr/US9l/03485 The light head 28 is attached to the camera head 26 through three legs 30, two of which are shown. Legs of different lengths may be used depending upon the inner ~ met~r of the bore 14 or casing.
The larger the inner diarneter, the longer the legs should be so as to not illtelrele with the camera viewing angle.
Referring now to FIG. 3, the camera head 26 part of the instrument probe 12 is preC~nte~ Section 32 of the cable 16 is coupled to the optical t~ r section 34. At this component, electric~l signals from the camera rep.esel,tillg camera irnages are converted into optical signals and coupled to an optical fiber disposed within the cable. The optical fiber is used for the tr~ncmiccion of the irnages to the surface. Flectri~l/optical COllYt~ are well known in the art as well as couplers for coupling the converter 34 to the optical fiber and no further details are given herein.
The next section in the carnera head 26 is the electrical section 36. The electrical power brought into the instrurnent probe 12 by the cable 16 is coupled to this section where the olectTic~l power is converted into the voltages ~etle~l by the camera, the light and the electrical/optical collv~lLer. For example, the voltage supplied by the cable 16 may be 100 Vdc while the camera opOEates on 12 Vdc and the light on 50 Vdc. The ~lectri~l/optical converter may require 12 Vdc. Such cul~v~Ler boards are well known in the art, for example, Model SWA175-4300 by Power-One, Inc., C~mm~nllo, California.
The next section in the camera head 26 is the camera 38 itself.
In one embo~lim~n~, the camera was a charge coupled device (CCD) type television camera which is capable of providing high speed, high resolution images in relatively & light. One camera found to be usable in an embodiment is the CCD Video Camera Module having a model number ûf XC 37 made by Sony Corporation. Coupled to the camera is a lens 40 which in one embodiment was a fisheye lens, and a quartz window 42. The window 42 seals the camera head 26 at WOgl/19884 ~ PCr/US91/03485 its bottom end and protects the lens 40 against high pressure/high temperature fluids which may exist in the well bore. Its angle is selected so as to not obstruct the viewing angle of the lens 40. Also shown in F~G. 3 is part of the legs 30 which are welded to the 5 camera head 33 in this embodiment and which hold the light head 44 in positiorl in front of the lens 40. The electrical corl~ to~s 48 are separately routed through the legs to the light head. In the embo-iim~nt shown, three legs were used although only two legs are shown in this figure.
Referring now to F~G. 4, the light head 28 is shown having a halogen lamp 46. The light head 28 is attached to the camera sect;on by legs 30 which are also welded into the light head 28 in this emborlimPnt The length of the legs is selected based on the inner rli~mpt~r of the bore or casing. Where the camera must see further because of a larger inner diameter of the casing, the legs 30 are made longer so that the light head will not obstruct the view of the lens. Where the inner fii~meter is small, the legs may be shorter so that more light is placed within the camera viewing angle. Thus, several different light heads with varying lengths of legs may be required. F.lectric~l power conductors 48 which provide .olectric~l power to the light traverse one or more of the legs 30. Other light sources may be used such as in~n~l~s~nt lamps. Additionally, light other than visible light may be used, for example, infrared and ultraviolet.
In accordance with the invention, power for the ilL~hu~llent probe 12 resides at the surface at the controller 22. In one embo~iment, the power source at the controller 22 is L~ lll;tte-l to the support cable 16 via slip rings at the drum 20 in accordance with techniques known to those skilled in the art.
~n order to conduct the n~c~ss~.~y power over the long distances comm~ nly experienced by video logging systems, a multi-layer cable 2 0 8 tI ~
WO 91/19884 PCI/US9lt03485 11 .
is provided. Referring now to F~G. 5, a cross-sectional view of a cable in accordance with the invention is presented. Disposed at the center is the optical fiber 50 and imm~ t~oly around it is a buffer layer 52. Although only a single optical fiber is shown in this 5 embollim~nt, mtlltiple fibers may be used to comprise a fiber optic cable. The buffer layer 52 provides m~h~nic~l iCol~tion Surrounding the bùffer layer 52 and co~ l therewith is an inner layer of electrically conductive strands 54 which in one embodiment are formed of copper. These strands form a power conductor which 10 conducts power from the controller 22 to the instrument probe colll~onents. Surrounding the power conductor 54 is a layer of insulation 56 and surrounding the insulation is a layer comprising strength member strands 58 alten~ting with outer, f~lectric~lly conductive strands 60. In this embo-liment, one outer conductive 15 strand 60 is interspaced with two strength member strands 58.
To b~l~nce the resistance of the power conductors 54 with the resistance of the strength members 58 which also serve as one leg of the resistive loop, ten outer electrically conductive strands which in one embodiment are formed of copper, are alternately interspaced 20 in the total of thirty strands in the layer. The power conductor resistance when formed of copper strands is 6.1 ohms per 305 melers (1000 feet). The twenty steel and the ten copper resistive loop strands have a resistance of 18.1 ohms per 305 m (1000 ft). l~us, the loop resistance is 24.2 ohms per 305 m (1000 ft). Because of 25 this arrangement of ~It~t~ly interspaced copper and steel strands, the loop resistance is lowered. The diameter of the strength members then may be stqlecterl to satisfy only strength concerns rather than both strength and electrical conductivity concerns. It has been found that in a cable in accordance with the invention, the strength 30 members are significantly cm~llP~ thus resulting in a much s~ ler wo 91/19884 2 0 8 4 5 0 1 Pcr/us9l/o3485 and lighter support cable yet one with loop resistance low enough so that a manageable voltage may be used at the surface.
~n one embotlim~nt, the optical fiber used was a 50/125/245 multi-mode fiber with a buffer formed of Hytrel which is available from Dupont in Wilmington, Delaware. The optical fiber had a 0.050 mm core with 0.125 mm rl~ ing. The Hytrel buffer was 0.18 mm (0.007 in.) in average thi~knPss. The power con~ Ls~ls were 0.38 - mm (0.015 in.) in diameter and were formed of copper HDBC, the insulator was 0.48 mm (0.019 in.) in thickn.ocs, and each strength member and resistive loop conductor was 0.25 mm (0.010 in.) in ~i~m~ot~r. The insulahon was compounded Hytrel and the strength strands were formed of i~ ov~d plow steel.
Surrounding all of the above members is an outer sheath 62 which in one embo-lim~nt, is made of st~inl~cs steel sheet having a thickness of 0.20 mm (0.008 in.). In one emborlim~nt, the st~inl~s steel sheet was formed into a tube shape and welded lengthwise to form the outer ch~th The st~inl~sc steel is strong and fluid resistive thus protecting the internal components. rt was found that forming the outer sheath of st~inl~cs steel provides a smooth outer surface .20 thus f~rilit~ting its movement in pressure sealing glands and around sheaves and drums. Because it is relatively thin, it can be rolled on the sheaves and drums as n~c~s~
Because of the commo~ly-exp~ nre~l high p~ s of fluids found in bores, the cable entry point into the i~ lent probe 12 must be sufficiently sealed to protect against the entry of extraneous fluids. ~n accordance with the invention, a series of three fluid seals is provided. Each seal is formed of col~ ol~ly available parts thus being eco~omir~l to provide.
Refemng now to F~G. 6, mounted at the cable head 25 is the first seal 64. ~t comprises a co~ lesaiv~ type seal using flexible m~t~n~lc such as ordinary "O-rings." ~n this embo~liment, three O-208~5~1 WOsl/l9884 . PCI/US9l/03485 rings are used and are coll.pl~ssed onto the outer cable sheath 62 as it enters the instrument probe. Two of these O-rings 66 comprise metal washers which have rubber seals inserted within them. These are comm~ nly called Parker "Thread Seals" or "Stat-O-Seals" and are S available from Parker Seals, Culver City, CaliforIua. The third O-ring 68 is a collvt:lltional O-ring inserted between the two Parker thread seals.
ReÇellillg now to FIGS. 6 and 7 for a des.li~tion of the second seal, the outer sheath 62is t~ terl and a length of tubing 71 is 10 mounted on a s~lPcte~l length of the outer sheath 62 ad3acent the tPnnin~tion point. The steel strength members 58 and outer conductors strands 60 are folded back over the tubing 71. The optical fiber, buffer, power conductor strands and insulation are not folded back. The folded back strands are then coated liberally with 15 a fluid resistant a&esive caulking material 73 such as that sold as Tri-con #230 epoxy made by Tri-Con, Inc. of 55 North Street, Medford, Massachusetts. After co~ting with epoxy, an outer blllkhP~tl tube 72 is placed over the folded back strands. As is well known in the art, the number of strands folded back and their lengths 20 detell,.ule the break-away force r~uired for the cable to be separated from the il~Llul~lent probe 12. By sPlPcting the number and length of the bent back strength members, the force may be set so that if the instrument probe 12 should become stuck in a bore or casing for some reason, the cable may be pulled out of the instrument probe 25 and then the instrument probe can be reco~ed by other m~n.C. In the event that a reduced breakaway force is required, some of the strength members may be cut but not folded back.
The b-llkhP~tl tube 72 makes electncal contact with the bent back members thus putting the b~llkhe~(l tube 72 and b--lkh.o~l 74, 30 to which the tube is joined, in the electrical return path.
Additionally, in the embodiment shown, the length of cable covered WO 91/19884 ~ Q ~ ~ 5 ~ 1 Pcr/US9l/03485 by the blllkh~ tubing 72 is also coated with the cauLking 73 so that all parts of the cable covered by the bl.lkhe~3 tubing 72 are coated. Upon set~ng, the adhesive cauLtcing 73 will hold the au~pOlL
cable in position inside the bl.lkh~.l tubing as well as provide a fluid seal. In the event that ~l~atL, ~l~ctnr~l conductivity is rt:qu~ed, an Plectn-~lly cond-lcLiv~ epoxy may be used.
Refe~ing now more particularly to FIG. 7, welded to the other end of the bu~head tube 72 is a blllkhe~ 74. As show~ it has fluid seals 75 on its outer surface. A threaded bore is formed through the bnlkh~ 74 for pl~c~m~nt of the third seal 76. Mounted in the threaded bore and comprising part of the third seal is a co~ re~ion coupler 78. The coupler 78 has NPT pipe threads formed on its end which is connected to the btllkh~(l thus fo~ning a fluid seal. The other end of the coupler is shaped to accept a coll,pres~ion fitting and a co~ re~ion nut for col"plt:s~ing the fitting.
In the third seal, a col,lpres~ion sheath 80 also having a fluid resistant, a&esive cauL~ing material placed inside is mounted over the r.om~intl~r of the support cable which proceeds through the buLkhead. In one embo~lim~ont, a col~l~lession sheath 80 formed of brass tubing having a 3.2 mm (0.125 in.) outer fli~m~rer by 2.3 mm (0.090 in.) inner ~i~m~t~r. Placed over the colll~le~sion shearh 80 is a-colllp~es~ioll fitting 82 and placed over the fitting 82 is a conlpl~s~ion nut 84. As the cu~ ression nut 84 is turned OlltO the coupler 78, the colllplession fitting 82 is forced into closer contact with the colllpression sheath 80 thereby fo~r~ing a fluid tight seal.
The con.~es~ion fit~ing 82, nut 84 and coupler 78 are all st~n~l~rd "plnmhing' parts which are commonly av~ le Thus by use of the three seals, the cnnn~oc~ion of the ~ulJ~oLL
cable with the i~ ent probe 12 is made fluid tight for use in high ~ s~ ri~u~nllentc Additionally, because all of the seals WO 91/19884 ~ 0 8 4 ~ ~) 1 PCI/US91/03485 are made of standard componPntc~ the three seals are economical to provide and m~nllf~cturing on a repP~r~hle basis is f~rilit~te~l Past the third seal, a co~t~ct 86 is formed on the co~ ression sheath 80. Because the cG~ es~ion sheath 80 is in physical and 5 ~l~ctrir~l contact with other third seal parts which are in ~lPctnt~l contact with the b-llkh~ 74 which is in ~l~ctri~ ~l contact with the b--lkh~l tube 72 which cont~ct~ th~e folded back steel strength members 58 and outer conductor strands 60, a potential is made available at the contact 86 as in~liC~te~l by the t~rmin~l symbol. Past 10 this cont~ct, the power con~lctors 54 are folded back to make a second potential available. Past this point, the optical fiber 50 CQ~timl-oc.
Thus, in accordance with the invention, a new and useful inspection system is provided having the power source for the 15 instrument probe located at the sl~ e rather than in the instrument probe itself. The design of the su~po~ cable results in lower loop r~ ce thus allowing a sm~ r cable and a more manageable supply voltage at the surface. Additionally, a smooth yet strong outer sheath on the cable makes it easier to handle yet it provides 20 protection for the int~orn~l cable colu~lents. The fluid seals are relatively ~imI~le, easy to impl~m.ont, lower in cost and can be r~ctured on a repe~t~hle basis.
rt will be ~ lt from the f~ e~oil~g that, while particular forms of the invention have been illustrated and described, various 25 mo-lifi~tiQns can be made without depamng from the spirit and scope of the invention. Acco~ lgly, it is not intended that the invention be limitefl, except as by the appended claims.
Claims (30)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An inspection system for inspecting the condition of an elongated passage with an instrument probe for placement in the passage, the instrument probe comprising a camera for generating images of the passage and providing signals representative of those images, the system having a surface unit located near the entrance to the passage, the surface unit comprising a controller and a power source; a support cable connected between the instrument probe and the surface unit and having: an optical fiber along which the camera signals are conducted to the controller; a plurality of electrical conductors connected between the power source of the surface unit and the instrument probe which provide power to the instrument probe; and a plurality of strength members being connected between the surface unit and the instrument probe and disposed in electrical contact with the electrical conductors; and sealing means for sealing the instrument probe against external fluids at a connection of the support cable to the instrument probe.
2. The inspection system of Claim 1, wherein the strength members and electrical conductors are in electrical contact with each other and are alternating with each other.
3. The inspection system of Claim 1, wherein the optical fiber is located substantially at the center of the support cable; and the support cable comprises: a first layer of electrical conductors; a second layer of electrical conductors; and the strength members are in electrical contact with and are alternating with the conductors in the second layer.
4. The inspection system of Claim 2, wherein the optical fiber is located substantially at the center of the support cable; and the support cable comprises: a first layer of electrical conductors; a second layer of electrical conductors; and the strength members are in electrical contact with and are alternating with the conductors in the second layer.
5. The inspection system of Claim 3, wherein the first layer of electrical conductors is located adjacent the optical fiber and the second layer of electrical conductors and strength members is located on the opposite side of the first layer from the optical fiber.
6. The inspection system of Claim 4, wherein the first layer of electrical conductors is located adjacent the optical fiber and the second layer of electrical conductors and strength members is located on the opposite side of the first layer from the optical fiber.
7. The inspection system of any one of Claims 1, 2, 3, 4, 5 or 6, wherein the support cable is connected to the instrument probe with a breakaway connection which will cause disconnection of the support cable from the instrument probe upon pulling the support cable with a predetermined amount of force.
8. The inspection system of any one of Claims 1, 2, 3, 4, 5 or 6, wherein the support cable comprises a continuous, sealed and smooth outer sheath which surrounds the electrical conductors, strength members and the optical fiber.
9. The inspection system of any one of Claims 1, 2, 3, 4, 5 or 6, wherein the support cable is connected to the instrument probe with a breakaway connection which will cause disconnection of the support cable from the instrument probe upon pulling the support cable with a predetermined amount of force, and wherein the support cable comprises a continuous, sealed and smooth outer sheath which surrounds the electrical conductors, strength members and the optical fiber.
10. The inspection system of any one of Claims 1, 2, 3, 4, 5 or 6, wherein the support cable comprises a continuous, sealed and smooth outer sheath which surrounds the electrical conductors, strength members and the optical fiber, and where the outer sheath comprises stainless steel.
11. The inspection system of any one of Claims 1, 2, 3, 4, 5 or 6, wherein the support cable is connected to the instrument probe with a breakaway connection which will cause disconnection of the support cable from the instrument probe upon pulling the support cable with a predetermined amount of force, wherein the support cable comprises a continuous, sealed and smoothed outer sheath which surrounds the electrical conductors, strength members and the optical fiber, and wherein the outer sheath comprises stainless steel.
12. The inspection system of any one of Claims 1, 2, 3, 4, 5 or 6, wherein the instrument probe further comprises a bulkhead; and the sealing means comprise: a first seal for providing a seal between the support cable and the instrument probe near the connection point of the support cable to the instrument probe; a second seal for providing a seal between the instrument probe and the cable in the area of the connection of the strength members to the instrument probe; and a third seal for providing a seal between the instrument probe and the support cable at the bulkhead.
13. The inspection system of any one of Claims 1, 2, 3, 4, 5 or 6, wherein the support cable is connected to the instrument probe with a breakaway connection which will cause disconnection of the support cable from the instrument probe upon pulling the support cable with a predetermined amount of force, and wherein the instrument probe further comprises a bulkhead; and the sealing means comprise: a first seal for providing a seal between the support cable and the instrument probe near the connection point of the support cable to the instrument probe; a second seal for providing a seal between the instrument probe and the cable in the area of the connection of the strength members to the instrument probe; and a third seal for providing a seal between the instrument probe and the support cable at the bulkhead.
14. The inspection system of any one of Claims 1, 2, 3, 4, 5 or 6, wherein the support cable is connected to the instrument probe with a breakaway connection which will cause disconnection of the support cable from the instrument probe upon pulling the support cable with a predetermined amount of force, wherein the support cable comprises a continuous, sealed and smooth outer sheath which surrounds the electrical conductors, strength members and the optical fiber, and wherein the instrument probe further comprises a bulkhead; and the sealing means comprise: a first seal for providing a seal between the support cable and the instrument probe near the connection point of the support cable to the instrument probe; a second seal for providing a seal between the instrument probe and the cable in the area of the connection of the strength members to the instrument probe; and a third seal for providing a seal between the instrument probe and the support cable at the bulkhead.
15. The inspection system of any one of Claims 1, 2, 3, 4, 5 or 6, wherein the support cable is connected to the instrument probe with a breakaway connection which will cause disconnection of the support cable from the instrument probe upon pulling the support cable with a predetermined amount of force, wherein the support cable comprises a continuous, sealed and smooth outer sheath which surrounds the electrical conductors, strength members and the optical fiber, said outer sheath comprising stainless steel, and wherein the instrument probe further comprises a bulkhead; and the sealing means comprise: a first seal for providing a seal between the support cable and the instrument probe near the connection point of the support cable to the instrument probe; a second seal for providing a seal between the instrument probe and the cable in the area of the connection of the strength members to the instrument probe; and a third seal for providing a seal between the instrument probe and the support cable at the bulkhead.
16. A communication and power cable comprising an optical fiber and electrical conductors, the optical fiber being located substantially at the center of the cable; a first layer of electrical conductors; a second layer of electrical conductors separated from the first layer; and strength members which are in electrical contact with and are alternating with the electrical conductors of the second layer.
17. The cable of Claim 16, wherein the first layer is located adjacent the optical fiber and the second layer is located on the opposite side of the first layer from the optical fiber.
18. The cable of Claim 16, further comprising a continuous, sealed and smooth outer sheath which surrounds the optical fiber, the first and second layers and the strength members.
19. The cable of Claim 18, wherein the outer sheath comprises stainless steel.
20. A down-hole inspection system for the remote visual inspection of the condition of an elongated passage, comprising:
a down-hole instrument for placement in the elongated passage for performing the visual inspection of said passage, said instrument comprising a non-articulated body being sealed against the entry of pressurized external fluid into the instrument and configured so that gravitational forces are required to move the instrument downwardly through the elongated passage, the non-articulated body having a first end, the body comprising:
a television camera for rendering the visual imagery of the passage into corresponding electrical image signals representative of that visual imagery; and an electrical-to-light transducer for converting the electrical image signals into optical image signals;
a support cable having a first end and a second end, the first end connected to the first end of the down-hole instrument so as to support the entire weight of the instrument, the support cable having at least one optical fiber, the optical fiber operative to receive the optical image signals from the electrical-to-optical transducer and conduct said optical image signals to the second end of the cable; and surface equipment located outside the passage, the surface equipment comprising:
a controllable actuator coupled to the support cable to control the position of the support cable and oppose the gravitational forces acting on the instrument thereby controlling the position of the instrument in the passage; and a processor coupled to the optical fiber at the second end of the support cable to receive the optical image signals, the processor having an optical-to-electrical transducer for converting the optical image signals from the optical fiber into corresponding electrical image signals.
a down-hole instrument for placement in the elongated passage for performing the visual inspection of said passage, said instrument comprising a non-articulated body being sealed against the entry of pressurized external fluid into the instrument and configured so that gravitational forces are required to move the instrument downwardly through the elongated passage, the non-articulated body having a first end, the body comprising:
a television camera for rendering the visual imagery of the passage into corresponding electrical image signals representative of that visual imagery; and an electrical-to-light transducer for converting the electrical image signals into optical image signals;
a support cable having a first end and a second end, the first end connected to the first end of the down-hole instrument so as to support the entire weight of the instrument, the support cable having at least one optical fiber, the optical fiber operative to receive the optical image signals from the electrical-to-optical transducer and conduct said optical image signals to the second end of the cable; and surface equipment located outside the passage, the surface equipment comprising:
a controllable actuator coupled to the support cable to control the position of the support cable and oppose the gravitational forces acting on the instrument thereby controlling the position of the instrument in the passage; and a processor coupled to the optical fiber at the second end of the support cable to receive the optical image signals, the processor having an optical-to-electrical transducer for converting the optical image signals from the optical fiber into corresponding electrical image signals.
21. The system of claim 20, wherein the surface equipment further comprises a display device for receiving the electrical image signals provided by the optical-to-electrical transducer and converting them into a visual display for presentation to an operator.
22. The system of claim 20, wherein the surface equipment further comprises a recording device for receiving the electrical image signals provided by the optical-to-electrical transducer and recording those signals.
23. The system of claim 20, wherein the surface equipment further comprises a video tape recorder for receiving the electrical image signals provided by the optical-to-electrical transducer and recording the video imagery represented by those signals for later analysis and inspection.
24. The system of claim 20, wherein the surface equipment further comprises a printing device for receiving the electrical image signals provided by the optical-to-electrical transducer and printing the images represented.
25. The system of claim 20, wherein the television camera comprises a charge coupled device television camera which is capable of providing high speed, high resolution images in relatively dim light.
26. The system of claim 20, wherein:
the down-hole instrument comprises a longitudinal centerline; and the television camera is located in the instrument such that it views in a direction parallel to the longitudinal centerline.
the down-hole instrument comprises a longitudinal centerline; and the television camera is located in the instrument such that it views in a direction parallel to the longitudinal centerline.
27. The system of claim 20, further comprising a light source positioned so as to illuminate the field of view of the television camera.
28. The system of claim 27, wherein the light source is positioned within the field of view of the camera.
29. The system of claim 28, wherein the light source is held in position in front of the television camera by means of at least one leg mounted on the unitary body of the down-hole instrument.
30. The system of claim 29, wherein the length of the at least one leg is selected in dependance on the portion of the field of view of the camera to be illuminated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US540,573 | 1983-10-07 | ||
| US07/540,573 US5140319A (en) | 1990-06-15 | 1990-06-15 | Video logging system having remote power source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2084501A1 CA2084501A1 (en) | 1991-12-16 |
| CA2084501C true CA2084501C (en) | 1995-06-27 |
Family
ID=24156025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002084501A Expired - Lifetime CA2084501C (en) | 1990-06-15 | 1991-05-17 | Video logging system having remote power source |
Country Status (8)
| Country | Link |
|---|---|
| US (2) | US5140319A (en) |
| EP (2) | EP0533771B1 (en) |
| JP (1) | JPH05507975A (en) |
| BR (1) | BR9106562A (en) |
| CA (1) | CA2084501C (en) |
| DE (2) | DE69132463T2 (en) |
| NO (1) | NO306178B1 (en) |
| WO (1) | WO1991019884A1 (en) |
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| CN115614023B (en) * | 2022-12-16 | 2023-03-10 | 中国石油集团川庆钻探工程有限公司 | Underground visualization system for coiled tubing |
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-
1990
- 1990-06-15 US US07/540,573 patent/US5140319A/en not_active Expired - Lifetime
-
1991
- 1991-05-17 EP EP91911108A patent/EP0533771B1/en not_active Expired - Lifetime
- 1991-05-17 CA CA002084501A patent/CA2084501C/en not_active Expired - Lifetime
- 1991-05-17 BR BR919106562A patent/BR9106562A/en unknown
- 1991-05-17 EP EP94117679A patent/EP0643198B1/en not_active Expired - Lifetime
- 1991-05-17 JP JP91510629A patent/JPH05507975A/en active Pending
- 1991-05-17 DE DE69132463T patent/DE69132463T2/en not_active Expired - Fee Related
- 1991-05-17 WO PCT/US1991/003485 patent/WO1991019884A1/en active IP Right Grant
- 1991-05-17 DE DE69117952T patent/DE69117952T2/en not_active Expired - Fee Related
-
1992
- 1992-12-14 NO NO924831A patent/NO306178B1/en not_active IP Right Cessation
-
1993
- 1993-02-11 US US08/016,769 patent/US5355128A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE69117952D1 (en) | 1996-04-18 |
| BR9106562A (en) | 1993-04-20 |
| DE69117952T2 (en) | 1996-11-21 |
| CA2084501A1 (en) | 1991-12-16 |
| JPH05507975A (en) | 1993-11-11 |
| EP0643198B1 (en) | 2000-11-02 |
| DE69132463T2 (en) | 2001-06-07 |
| US5355128A (en) | 1994-10-11 |
| DE69132463D1 (en) | 2000-12-07 |
| EP0533771A1 (en) | 1993-03-31 |
| WO1991019884A1 (en) | 1991-12-26 |
| EP0643198A3 (en) | 1995-05-31 |
| EP0533771B1 (en) | 1996-03-13 |
| US5140319A (en) | 1992-08-18 |
| NO306178B1 (en) | 1999-09-27 |
| NO924831L (en) | 1993-02-12 |
| EP0643198A2 (en) | 1995-03-15 |
| NO924831D0 (en) | 1992-12-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKEC | Expiry (correction) |
Effective date: 20121202 |