US3430711A - Casing perforating and screen plug setting device - Google Patents
Casing perforating and screen plug setting device Download PDFInfo
- Publication number
- US3430711A US3430711A US689468A US3430711DA US3430711A US 3430711 A US3430711 A US 3430711A US 689468 A US689468 A US 689468A US 3430711D A US3430711D A US 3430711DA US 3430711 A US3430711 A US 3430711A
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- Prior art keywords
- casing
- perforating
- housing
- screen plug
- well
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- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
Definitions
- the invention relates to wells drilled in the earth, and more particularly to completing and producing fluids from such wells.
- the device involves an element for perforating a well casing in combination with an element for inserting a screen or filter plug into the perforation.
- An object of the invention is to provide a device wherein the casing of a well may be perforated and at the same time a screen plug set in the casing to prevent sand or other unconsolidated material from entering the well bore along with the fluid being produced.
- Another object is to provide a perforating and screen plug setting device which may be lowered into the well and perform the above mentioned functions after the casing has been lowered and cemented into place.
- Another object of the invention is to provide a device which will permit standard well completion and water shut off practices, and at the same time eliminate the need of setting screens, gravel packs and so forth.
- the screen setting process will instead be combined with the usual casing perforating procedure, and thus creating a savings in time and money.
- Still another object of the invention is to create a casing perforating and screen plug setting device which may be suspended in the well on a line from the surface and at any selected point, be locked in position in the casing by electric means from the surface. Also upon command from the surface the casing may be perforated and the screen plug set in the perforation. Subsequent to this the device may be freed from its position in the casing and retrieved from well.
- a further object is to offer an oil well casing perforating and screen plug setting device which contains multiple units as described above and which will perform the perforating and screen plug setting operation at selected points in the casing a number of times without necessitating the removal of the device from the well bore.
- Yet another object of this invention is to provide a casing perforating and screen plug setting device with the versatility mentioned and yet relatively simple in design, free from operating failure and inexpensive to fabricate.
- FIGURE 1 is a top view showing the casing with the perforating and screen plug setting device positioned within.
- FIGURE 2 is a top section view of line 2-2 of FIG. 4 showing the device after the screen plug has been set in the perforation.
- FIGURE 3 is a longitudinal section of the invention along line 3-3 of FIG. 1, showing the device disposed in the well casing after the perforation has been made.
- FIGURE 4 is a longitudinal section of the device positioned in the well casing subsequent to the insertion of the screen plug.
- FIGURE 5 is a detailed section of the screen plug after having been set in the casing.
- FIGURE 6 is a side view of the perforating and screen plug setting device shown in multiple unit construction.
- the casing In current well completion practice, the casing is lowered into the hole and cemented into place. The cement is forced down the casing and up between the casing and the bore hole. In doing this the formation is completely shut off from the casing, and in order to produce the fluids from the formation, the casing and cement must be perforated.
- the usual practice is to set the casing in cement as described above and then selectively perforate the casing and cement opposite oil or gas sands. This prevents the production of water, since the water sands are left shut off behind the cement.
- the procedure described here is to provide a device which will selectively perforate a Well casing, and at the same time insert a filter plug in the perforation which will hold fast, and prevent sand and other unconsolidated materials from entering the casing.
- FIG. 3 there is illustrated a Well casing 10 which has been set in the earth formation 11.
- the cement 12 has been pumped down the casing and up between the casing 10 and the earth formation 11 and allowed to set up.
- the main housing 13 is suspended on the cable 14 and is locked in position in the casing 10 by the clutch 15.
- the clutch is activated by the power motor 16.
- a multi-strand electrical conducting cable 17 is integral with the cable 14 and extends from the surface to the device and enters the device at point 18.
- a moveable member 19 is disposed within the main housing 13, and is moveable in a longitudinal direction relative to the main housing 13. The moveable member 19 is limited in its upward movement when the abutment 20 comes in contact with the main housing wall at 21.
- the movement of the moveable member in the opposite direction stops when the moveable member 19 comes in contact with the main housing wall at 22 as in FIG. 4.
- a spring 23 urges the moveable member 19 down toward the position shown in FIG. 4.
- the catch 24 holds the moveable member 19 in position against the tension of the spring 23 until the solenoid 25 releases it from its seat 26 in the main housing.
- the wire 27 which activates the solenoid 25, leads into the multi-strand conducting cable 17.
- the Wire 28 activates the clutch motor 16 and also leads into the multi-strand cable 17.
- the moveable member 19 is equipped with a projectile passage 29, through which the perforating projectile 30 is fired.
- the solenoid 31 and Wire 48 detonate the cartridge 32 which fires the perforating projectile 30.
- the chamber 33 is completely enclosed and is filled with compressed gas.
- the solenoid valve 34 is activated by the wire 35 which leads to the multi-strand cable 17. When the solenoid valve 34 is activated the compressed gas flows into the chamber 36 and drives the packing 37 out of the chamber 36, and thus driving the screen plug 38 out of the chamber 36 and into the perforation 39 in the casing 10, as is shown in FIG. 4.
- the gasket 40 have been perforated by the perforating projectile 30.
- the screen plug 38 is equipped with projections 42 for the purpose of holding it fast in the perforation.
- the projections 42 are barb shaped and are made of hardened steel so as not to be damaged when the screen plug is forced into the perforation.
- the filtering material 43 is of a type which can be securely bonded to the inside of the plug, and can be adapted to filter out various size sands.
- the filter may be made of any of the common types of plastic or fiber filters.
- FIG. 6 This view shows the device in its multi-unit construction.
- the upper unit 44 is connected to a like unit 45 by the sleeve 46.
- the unit 45 i may be connected to a multiplicity of similar units in the same fashion.
- FIG. 2 is a section view taken along line 22 in FIG. 4. This view shows the open space 47 between the moveable member 19 and the main housing 13.
- the wires 27, 28, 35 and 48, which activate the clutch mechanism, the firing mechanism, the catch release and the solenoid valve 34, are shown in section view. Also shown in this view is the chamber 36, the packing 37 and the filter plug 38.
- FIG. 1 shows a top view of the main housing 13 in the casing 10. Also shown is the clutch mechanism 15, and the cable 14.
- the casing perforating and screen plug setting device would be used in place of a conventional casing perforating device, and when the casing has been cemented in place and prepared for selective perforating.
- the device would be lowered in the casing on the cable 14 to a point selected to be perforated.
- the clutch 15 would be employed to hold the device rigid in the casing.
- the detonator 31 is activated electrically from the surface and fires the projectile '30 through the casing.
- the catch 24 is then released and the moveable member 19 moves due to compression in the spring 23 to a predetermined point as shown in FIG. 4 which aligns the filter plug with the perforation.
- the solenoid operated valve 34 is then opened and the high pressure gas drives the packing 37 and the filter plug 38 through the passage and into the casing perforation.
- the packing remains at the end of the passage and is removed with the device.
- the clutch 15 is then released and the device moved to another selected point or removed from the well.
- Shaped charges can easily be substitued for the gun type perforating.
- the filter plug can be driven by a powder charge or by hydraulic means.
- the various operations described in the foregoing specification can be triggered individually from the surface or may be activated in an automatlc succession with the use of electrical relays.
- An oil well casing perforating and screen plug inserting device consisting of: a tubular housing, an electrically operated clutch mechanism attached to the outside of-said housing, said clutch made up of a power motor adapted to activate a hinged arm and cause said hinged arm to expand and contact relative to said tubular housing; a moveable member within said housing and adapted to move in a longitudinal manner relative to said tubular housing; within said moveable member a casing perforating device, consisting of a projectile and electrical means for firing said projectile through a well casing, also within said moveable member a high pressure gas chamber separated from a filter plug by a solenoid operated valve, said filter plug consisting of a tubular member with filtering material bonded within said tubular member, around one end of said tubular member an external lip and gasket; said tubular member having external projections; a spring disposed between said tubular housing and said moveable member for the purpose of creating relative movement between said members; a solenoid operated releasable catch
- a casing perforating and screen plug inserting device for oil wells and the like consisting of: a cylindrical housing for lowering into a well casing; an electrically operated power grip on said housing to hold it stationary at any selected point in the casing; within said housing a slidable member which is movable relative to said housing; within said slidable member a gun casing perforator which may be fired from the surface at a selected point in the casing; said slidable member being held in spring loaded position by a releasable catch; also within said slidable member a cylindrical screen plug with means for forcing said screen plug into a perforation in the casing; said component parts being so arranged that the gun perforator may be fired into the casing at a selected point after the housing is fixed in place by said power grip; said catch may then be released and the slidable member moved relative to the housing to a point aligning the screen plug with the casing perforation; said screen plug may then be driven into said casing perforation.
- An oil well casing perforating and filter plug setting device comprising: a tubular housing suspended in a well casing on a line from the surface, integral with said housing a power grip which can be expanded upon command from the surface to hold said housing rigid within said casing; a movable member within said housing adapted to move relative to said housing; spring means urging said movable member to move relative to said housing, a releasable latch between said movable member and said housing to prevent relative movement; within said movable member a casing perforating device adapted to perforate the casing subsequent to the activation of said power grip; adjacent to the perforating device and within said movable member a filter plug, with means for forcible insertion into a casing perforation; said moveable member adapted to move, subsequent to the perforation of the casing and upon release of said latch, a predetermined distance necessary to align the filter plug with said casing perforation.
- a casing perforating and screen plug inserting device for oil wells and the like consisting of: a housing suitable for lowering into a well bore, said housing provided with clutches for holding said housing in a fixed position at a selected point in the well bore; within said housing a moveable member, said moveable member containing casing perforating means and a screen plug, with means for inserting said screen plug into a casing perforation, said moveable member adapted to move a distance neces- References Cited UNITED STATES PATENTS Jobe 166-55.1 Kinley 16655.1 Kinley 166-55.1 Thomas 16655.1 X Zandmer 166100 6 3,217,804 11/1965 Peter 175-4.52 X 3,301,337 1/1967 Vaughn et a1. 16655.3 3,348,621 10/1967 Schuster l754.52
Description
March 4, 1969 H. A. TAGGART CASING PERFORATING AND SCREEN PLUG SETTING DEVICE Filed Dec. 11, 1967 o 4L Z/ INVENTOR Hm/J6? T 30417 United States Patent Claims ABSTRACT OF THE DISCLOSURE The invention relates to wells drilled in the earth, and more particularly to completing and producing fluids from such wells. The device involves an element for perforating a well casing in combination with an element for inserting a screen or filter plug into the perforation.
An object of the invention is to provide a device wherein the casing of a well may be perforated and at the same time a screen plug set in the casing to prevent sand or other unconsolidated material from entering the well bore along with the fluid being produced.
Another object is to provide a perforating and screen plug setting device Which may be lowered into the well and perform the above mentioned functions after the casing has been lowered and cemented into place.
Another object of the invention is to provide a device which will permit standard well completion and water shut off practices, and at the same time eliminate the need of setting screens, gravel packs and so forth. The screen setting process will instead be combined with the usual casing perforating procedure, and thus creating a savings in time and money.
Still another object of the invention is to create a casing perforating and screen plug setting device which may be suspended in the well on a line from the surface and at any selected point, be locked in position in the casing by electric means from the surface. Also upon command from the surface the casing may be perforated and the screen plug set in the perforation. Subsequent to this the device may be freed from its position in the casing and retrieved from well.
A further object is to offer an oil well casing perforating and screen plug setting device which contains multiple units as described above and which will perform the perforating and screen plug setting operation at selected points in the casing a number of times without necessitating the removal of the device from the well bore.
Yet another object of this invention is to provide a casing perforating and screen plug setting device with the versatility mentioned and yet relatively simple in design, free from operating failure and inexpensive to fabricate.
These and other objects will become apparent in the following detailed specification and drawing in which:
FIGURE 1 is a top view showing the casing with the perforating and screen plug setting device positioned within.
FIGURE 2 is a top section view of line 2-2 of FIG. 4 showing the device after the screen plug has been set in the perforation.
FIGURE 3 is a longitudinal section of the invention along line 3-3 of FIG. 1, showing the device disposed in the well casing after the perforation has been made.
FIGURE 4 is a longitudinal section of the device positioned in the well casing subsequent to the insertion of the screen plug.
FIGURE 5 is a detailed section of the screen plug after having been set in the casing.
FIGURE 6 is a side view of the perforating and screen plug setting device shown in multiple unit construction.
In current well completion practice, the casing is lowered into the hole and cemented into place. The cement is forced down the casing and up between the casing and the bore hole. In doing this the formation is completely shut off from the casing, and in order to produce the fluids from the formation, the casing and cement must be perforated. The usual practice is to set the casing in cement as described above and then selectively perforate the casing and cement opposite oil or gas sands. This prevents the production of water, since the water sands are left shut off behind the cement.
Many times the producin sands are unconsolidated and flow into the well with the fluids being produced and cause damage to the equipment, and sanding up in the well. When this occurs the production equipment must be pulled and the well cleaned out. Many different approaches have been taken to solve the problem of sand production. The approach taken here is to plug the perforation with a fluid permeable filter plug, and thus prevent the sand from entering the well bore. The procedure of selectively perforating cemented casing precludes the possibility of placing filters or screen plugs in the casing before the casing is set in the well, because the cement must also be perforated after it has set up in the hole.
The procedure described here is to provide a device which will selectively perforate a Well casing, and at the same time insert a filter plug in the perforation which will hold fast, and prevent sand and other unconsolidated materials from entering the casing.
Referring now to the drawing in FIG. 3 there is illustrated a Well casing 10 which has been set in the earth formation 11. The cement 12 has been pumped down the casing and up between the casing 10 and the earth formation 11 and allowed to set up. The main housing 13 is suspended on the cable 14 and is locked in position in the casing 10 by the clutch 15. The clutch is activated by the power motor 16. A multi-strand electrical conducting cable 17 is integral with the cable 14 and extends from the surface to the device and enters the device at point 18. A moveable member 19 is disposed within the main housing 13, and is moveable in a longitudinal direction relative to the main housing 13. The moveable member 19 is limited in its upward movement when the abutment 20 comes in contact with the main housing wall at 21. The movement of the moveable member in the opposite direction stops when the moveable member 19 comes in contact with the main housing wall at 22 as in FIG. 4. A spring 23 urges the moveable member 19 down toward the position shown in FIG. 4. The catch 24 holds the moveable member 19 in position against the tension of the spring 23 until the solenoid 25 releases it from its seat 26 in the main housing. The wire 27 which activates the solenoid 25, leads into the multi-strand conducting cable 17. The Wire 28 activates the clutch motor 16 and also leads into the multi-strand cable 17.
The moveable member 19 is equipped with a projectile passage 29, through which the perforating projectile 30 is fired. The solenoid 31 and Wire 48 detonate the cartridge 32 which fires the perforating projectile 30. The chamber 33 is completely enclosed and is filled with compressed gas. The solenoid valve 34 is activated by the wire 35 which leads to the multi-strand cable 17. When the solenoid valve 34 is activated the compressed gas flows into the chamber 36 and drives the packing 37 out of the chamber 36, and thus driving the screen plug 38 out of the chamber 36 and into the perforation 39 in the casing 10, as is shown in FIG. 4. The gasket 40 have been perforated by the perforating projectile 30. The
Referring now to FIG. 6. This view shows the device in its multi-unit construction. The upper unit 44 is connected to a like unit 45 by the sleeve 46. The unit 45 i may be connected to a multiplicity of similar units in the same fashion.
FIG. 2 is a section view taken along line 22 in FIG. 4. This view shows the open space 47 between the moveable member 19 and the main housing 13. The wires 27, 28, 35 and 48, which activate the clutch mechanism, the firing mechanism, the catch release and the solenoid valve 34, are shown in section view. Also shown in this view is the chamber 36, the packing 37 and the filter plug 38.
FIG. 1 shows a top view of the main housing 13 in the casing 10. Also shown is the clutch mechanism 15, and the cable 14.
In operation the casing perforating and screen plug setting device would be used in place of a conventional casing perforating device, and when the casing has been cemented in place and prepared for selective perforating. The device would be lowered in the casing on the cable 14 to a point selected to be perforated. At this time the clutch 15 would be employed to hold the device rigid in the casing. The detonator 31 is activated electrically from the surface and fires the projectile '30 through the casing. The catch 24 is then released and the moveable member 19 moves due to compression in the spring 23 to a predetermined point as shown in FIG. 4 which aligns the filter plug with the perforation. The solenoid operated valve 34 is then opened and the high pressure gas drives the packing 37 and the filter plug 38 through the passage and into the casing perforation. The packing remains at the end of the passage and is removed with the device. The clutch 15 is then released and the device moved to another selected point or removed from the well.
Although a specific embodiment of the invention has been illustrated and described, it should be understood that many substitutions and modifications may be made without departing from the spirit of the invention. Shaped charges can easily be substitued for the gun type perforating. The filter plug can be driven by a powder charge or by hydraulic means. The various operations described in the foregoing specification can be triggered individually from the surface or may be activated in an automatlc succession with the use of electrical relays.
What I claim is:
1. An oil well casing perforating and screen plug inserting device of the type described consisting of: a tubular housing, an electrically operated clutch mechanism attached to the outside of-said housing, said clutch made up of a power motor adapted to activate a hinged arm and cause said hinged arm to expand and contact relative to said tubular housing; a moveable member within said housing and adapted to move in a longitudinal manner relative to said tubular housing; within said moveable member a casing perforating device, consisting of a projectile and electrical means for firing said projectile through a well casing, also within said moveable member a high pressure gas chamber separated from a filter plug by a solenoid operated valve, said filter plug consisting of a tubular member with filtering material bonded within said tubular member, around one end of said tubular member an external lip and gasket; said tubular member having external projections; a spring disposed between said tubular housing and said moveable member for the purpose of creating relative movement between said members; a solenoid operated releasable catch disposed between said tubular housing and said moveable member for the purpose of preventing relative movement between said members; said tubular housing being suspended on a multi-strand electrical conducting cable, said cable entering said housing; said component parts being so arranged that said clutch may be activated from the surface to expand and hold the device stationary in the well casing; at which time the perforating projectile may be fired through the casing and the catch released; said spring will then push the moveable member to a point aligning the filter plug with the perforation; the filter plug may then be inserted in the perforation by means of the high pressure gas; upon command from the surface the clutch may be released and the device removed from the well.
2. A casing perforating and screen plug inserting device for oil wells and the like consisting of: a cylindrical housing for lowering into a well casing; an electrically operated power grip on said housing to hold it stationary at any selected point in the casing; within said housing a slidable member which is movable relative to said housing; within said slidable member a gun casing perforator which may be fired from the surface at a selected point in the casing; said slidable member being held in spring loaded position by a releasable catch; also within said slidable member a cylindrical screen plug with means for forcing said screen plug into a perforation in the casing; said component parts being so arranged that the gun perforator may be fired into the casing at a selected point after the housing is fixed in place by said power grip; said catch may then be released and the slidable member moved relative to the housing to a point aligning the screen plug with the casing perforation; said screen plug may then be driven into said casing perforation.
3. An oil well casing perforating and filter plug setting device comprising: a tubular housing suspended in a well casing on a line from the surface, integral with said housing a power grip which can be expanded upon command from the surface to hold said housing rigid within said casing; a movable member within said housing adapted to move relative to said housing; spring means urging said movable member to move relative to said housing, a releasable latch between said movable member and said housing to prevent relative movement; within said movable member a casing perforating device adapted to perforate the casing subsequent to the activation of said power grip; adjacent to the perforating device and within said movable member a filter plug, with means for forcible insertion into a casing perforation; said moveable member adapted to move, subsequent to the perforation of the casing and upon release of said latch, a predetermined distance necessary to align the filter plug with said casing perforation.
4. The casing perforating and screen plug setting device of claim 3 combined in a series with a multiplicity of like units.
5. A casing perforating and screen plug inserting device for oil wells and the like consisting of: a housing suitable for lowering into a well bore, said housing provided with clutches for holding said housing in a fixed position at a selected point in the well bore; within said housing a moveable member, said moveable member containing casing perforating means and a screen plug, with means for inserting said screen plug into a casing perforation, said moveable member adapted to move a distance neces- References Cited UNITED STATES PATENTS Jobe 166-55.1 Kinley 16655.1 Kinley 166-55.1 Thomas 16655.1 X Zandmer 166100 6 3,217,804 11/1965 Peter 175-4.52 X 3,301,337 1/1967 Vaughn et a1. 16655.3 3,348,621 10/1967 Schuster l754.52
DAVID H. BROWN, Primary Examiner.
US. Cl. X.R.
Applications Claiming Priority (1)
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US68946867A | 1967-12-11 | 1967-12-11 |
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US3430711A true US3430711A (en) | 1969-03-04 |
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US689468A Expired - Lifetime US3430711A (en) | 1967-12-11 | 1967-12-11 | Casing perforating and screen plug setting device |
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Cited By (18)
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US3498377A (en) * | 1968-08-01 | 1970-03-03 | Schlumberger Technology Corp | Well completion methods and apparatus |
US3690380A (en) * | 1970-06-22 | 1972-09-12 | Donovan B Grable | Well apparatus and method of placing apertured inserts in well pipe |
US3695368A (en) * | 1971-04-07 | 1972-10-03 | Schlumberger Technology Corp | Apparatus for perforating earth formations |
US3706340A (en) * | 1971-04-07 | 1972-12-19 | Schlumberger Technology Corp | Methods for perforating an earth formation |
US6719049B2 (en) | 2002-05-23 | 2004-04-13 | Schlumberger Technology Corporation | Fluid sampling methods and apparatus for use in boreholes |
US6766854B2 (en) * | 1997-06-02 | 2004-07-27 | Schlumberger Technology Corporation | Well-bore sensor apparatus and method |
US20050016727A1 (en) * | 2003-07-25 | 2005-01-27 | Schlumberger Technology Corporation | [downhole sampling apparatus and method] |
US20050155760A1 (en) * | 2002-06-28 | 2005-07-21 | Schlumberger Technology Corporation | Method and apparatus for subsurface fluid sampling |
US20050279499A1 (en) * | 2004-06-18 | 2005-12-22 | Schlumberger Technology Corporation | Downhole sampling tool and method for using same |
US20060000603A1 (en) * | 2002-06-28 | 2006-01-05 | Zazovsky Alexander F | Formation evaluation system and method |
US20080035349A1 (en) * | 2004-04-12 | 2008-02-14 | Richard Bennett M | Completion with telescoping perforation & fracturing tool |
US20090183882A1 (en) * | 2006-07-21 | 2009-07-23 | Halliburton Energy Services, Inc. | Packer variable volume excluder and sampling method therefor |
US20100155061A1 (en) * | 2002-06-28 | 2010-06-24 | Zazovsky Alexander F | Formation evaluation system and method |
US20100175873A1 (en) * | 2002-06-28 | 2010-07-15 | Mark Milkovisch | Single pump focused sampling |
WO2010147476A1 (en) | 2009-06-16 | 2010-12-23 | Agr Cannseal As | Well tool and method for in situ introduction of a treatment fluid into an annulus in a well |
US8899323B2 (en) | 2002-06-28 | 2014-12-02 | Schlumberger Technology Corporation | Modular pumpouts and flowline architecture |
US10392909B2 (en) * | 2015-04-16 | 2019-08-27 | Advanced Hydrogen Technologies Corporation (Ahtc) | Nonexplosive device for perforating well casing and fracking |
US10662745B2 (en) * | 2017-11-22 | 2020-05-26 | Exxonmobil Upstream Research Company | Perforation devices including gas supply structures and methods of utilizing the same |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3498377A (en) * | 1968-08-01 | 1970-03-03 | Schlumberger Technology Corp | Well completion methods and apparatus |
US3690380A (en) * | 1970-06-22 | 1972-09-12 | Donovan B Grable | Well apparatus and method of placing apertured inserts in well pipe |
US3695368A (en) * | 1971-04-07 | 1972-10-03 | Schlumberger Technology Corp | Apparatus for perforating earth formations |
US3706340A (en) * | 1971-04-07 | 1972-12-19 | Schlumberger Technology Corp | Methods for perforating an earth formation |
US6766854B2 (en) * | 1997-06-02 | 2004-07-27 | Schlumberger Technology Corporation | Well-bore sensor apparatus and method |
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