US20050028983A1 - Vibrating system and method for use in scale removal and formation stimulation in oil and gas recovery operations - Google Patents
Vibrating system and method for use in scale removal and formation stimulation in oil and gas recovery operations Download PDFInfo
- Publication number
- US20050028983A1 US20050028983A1 US10/634,254 US63425403A US2005028983A1 US 20050028983 A1 US20050028983 A1 US 20050028983A1 US 63425403 A US63425403 A US 63425403A US 2005028983 A1 US2005028983 A1 US 2005028983A1
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- Prior art keywords
- wellbore
- tool
- scale
- driver
- transducer
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/08—Methods or apparatus for cleaning boreholes or wells cleaning in situ of down-hole filters, screens, e.g. casing perforations, or gravel packs
-
- 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
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
-
- 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
- E21B43/003—Vibrating earth formations
Definitions
- This invention relates to a vibrating device for use in scale removal and formation stimulation in an oil and gas recovery operation.
- scale In many oil and gas downhole recovery operations, scale, or salt crystal growths, and other foreign materials (collectively referred to as “scale”) are often precipitated during production of the reservoir fluids which can compromise the fluid recovery. For example, in high-rate, high-permeability completions, reservoir fluids are recovered that contain fines, or formation sand. Therefore, support and screening devices, such as screens, slotted liners, and the like, have been utilized to support a gravel pack, or the like, in the well to stabilize the formation while permitting the recovered fluids to pass from the formation into the wellbore while preventing passage of fines or formation sand with the recovered fluids.
- support and screening devices such as screens, slotted liners, and the like
- a “skin” develops around the wall of the wellbore which impedes the flow of fluid from the formation requiring stimulation techniques to remove the skin and stimulate the formation.
- FIG. 1 is a part diagrammatic, part sectional, and part elevational view of an embodiment of the sand control system of the present invention shown in a downhole environment.
- FIG. 2 is enlarged view of a portion of the system of FIG. 1 .
- the reference numeral 10 refers to a wellbore penetrating a subterranean ground formation F for the purpose of recovering hydrocarbon fluids from the formation.
- a tool 12 is lowered into the wellbore 10 to a predetermined depth by a work string 14 , in the form of wire line, coiled tubing, or the like, which is connected to the upper end of the tool 12 in a manner to be described.
- the tool 12 is shown generally in FIG. 1 but will be described in detail later.
- the string 14 extends from a rig 16 that is located above ground and over the wellbore 10 .
- the rig 16 is conventional and, as such, includes, inter alia, support structure, a motor driven winch, and other associated equipment for receiving and supporting the tool 12 and lowering it to a predetermined depth in the wellbore 10 by unwinding the string 14 from a reel, or the like, provided on the rig 16 .
- a string of production tubing 20 having a diameter greater than that of the tool 12 , is installed in the wellbore 10 in a conventional manner and extends from the ground surface to a predetermined depth in the wellbore 10 .
- three annular, axially-spaced, gravel pack support and screening devices 24 a , 24 b , and 24 c are mounted, in any conventional manner, to the wall of the wellbore 10 adjacent the formation F.
- the devices 24 a , 24 b , and 24 c can be in the form of screens, slotted liners, or any similar type of gravel support device.
- the devices 24 a , 24 b , and 24 c receive one or more gravel packs, or the like, (not shown).
- each device 24 a , 24 b , and 24 c The purpose of each device 24 a , 24 b , and 24 c is to improve the integrity of the wall of the wellbore 10 , yet allow the fluids recovered from the formation F to pass to and through the devices 24 a , 24 b , and 24 c and into the wellbore 10 , while preventing the passage of fines or sand from the fluids. Since the devices 24 a , 24 b , and 24 c are conventional, they will not be described in any further detail.
- the tool 12 is in the form of a mandrel, or cylindrical body member 30 having several components to be described mounted to it in a conventional manner.
- a conventional, quick release connector 30 a is mounted on the upper end of the body member 30 for connecting to the corresponding end of the string 14 in a manner to permit release of the connection remotely from the rig 16 .
- An annular flange 30 b extends radially outwardly from the upper end portion of the body member 30 and, in the operative position of the tool 12 shown in FIG. 2 , engages a landing nipple 32 mounted to the wall of the wellbore 10 in any conventional manner to support the tool 12 in the position shown.
- a driver, or power module 34 is mounted to the tool 12 and either contains a battery pack that provides a source of DC power, or is connected to an electrical conductor for receiving DC power from the rig 16 .
- the power module 34 is adapted to supply electrical power for reasons to be described.
- An acoustic transducer 36 is mounted on the outside of the body member 30 and is in the form of an electromechanical transducer that vibrates when it is driven, or excited by electrical power from the power module 34 .
- the acoustic transducer 36 can be in the form of a conventional electromechanical transducer, or converter, such as a loudspeaker, tuning fork, cantilever, oval-mode tool, magnetostrictive driver, or piezoelectric transducer.
- the frequency, or frequencies, of the output of the power module 34 is matched to the frequencies of the acoustic transducer 36 , so that the acoustic transducer 36 is driven at its resonating frequency.
- the acoustic transducer 36 can be in the form of a piezoelectric transducer, such as those marketed under the designation PZT-4 by the Edo Corporation of Salt Lake City, Utah.
- the tool 12 may be coupled with a lower frequency producing device to create the localized pressure drop necessary to dislodge some of the particles.
- a sensor 38 is mounted on the tool 12 and is adapted to remotely sense the accumulation of scale on the devices 24 a , 24 b , and 24 c and output a corresponding signal.
- the sensor 38 can operate in several conventional manners. For example, it can transmit an audio signal in a direction towards the devices 24 a , 24 b , and/or 24 c , measure the reflective signal returning from the devices 24 a , 24 b , and/or 24 c , compare the difference between the signals, and output a signal based on the comparison which will correspond to the scale accumulation on the devices 24 a , 24 b , and/or 24 c.
- a control unit 40 which can be in the form of a microprocessor, or the like, is mounted to the tool 12 and although not shown in the drawing in the interest of clarity, is electrically connected to the sensor 38 for receiving the above output signals from the sensor 38 corresponding to the scale accumulation on the devices 24 a , 24 b , and/or 24 c .
- the control unit 40 is also electrically connected to the power module 34 and is adapted to activate the power module 34 so that it provides the electrical power to vibrate the acoustic transducer 36 .
- the fluids pass through the devices 24 a , 24 b , and 24 c and upwardly in the wellbore 10 to the production tubing 20 for passing to the rig 16 for collection, while the devices 24 a , 24 b , and 24 c prevent fines or sand from the fluids from passing with the fluids.
- the tool 12 is lowered into the wellbore 10 before, after, or at any stage during, the above recovery process, until the flange 30 b engages the nipple 32 to locate the tool 12 adjacent the formation F.
- the sensor 38 is activated to sense any accumulation of scale on the devices 24 a , 24 b , and 24 c in the manner discussed above, and outputs a corresponding signal to the control unit 40 .
- the control unit 40 activates the acoustic transducer 36 when the scale accumulation exceeds a predetermined threshold, and the acoustic transducer 36 functions in the manner discussed above to vibrate continuously, or at a pulsed rate, to an extent that a sympathetic vibration is imparted to the devices 24 a , 24 b , and 24 c which loosen the scale and cause it to fall off the devices.
- the removed scale can be allowed to fall to the bottom of the wellbore 10 , or it could be circulated, in any conventional manner, to the rig 16 for recovery.
- the vibration of the acoustic transducer 36 also stimulates the formation F adjacent the devices 24 a , 24 b , and 24 c to promote recovery of the production fluids, and reduces the “skin” around the wellbore 10 that can slow the flow of production fluid from the formation F to the wellbore 10 .
- the tool 12 can remain in the wellbore 10 adjacent the formation F for later use, or can be removed as needed by lowering the string 14 into the wellbore 10 , reconnecting the string 14 to the connector 30 a on the body member 30 , and then raising the tool 12 out of the wellbore 10 .
- the scale accumulating on the devices 24 a , 24 b , and 24 c is broken up without causing any physical or chemical damage to the devices 24 a , 24 b , and 24 c , while the formation F is stimulated and the skin around the wellbore 10 is reduced.
- scale will accumulate on the wall of the well defining the bore, and can be removed in accordance with the foregoing, i.e. by vibrating the acoustic transducer 36 continuously or at a pulsed rate when the scale accumulation exceeds a predetermined threshold, to loosen the scale and cause it to fall off the wall.
- it is possible to directly measure the amount of scale on the wall by directly measuring the thickness of the radius of the wellbore 10 . This is achieved by using the reflected sonic signal to measure the distance to the wall of the well.
- both down-hole pressure and rate are monitored.
- the cumulative skin factor of the wellbore 10 is calculated. Skin factor is plotted versus treating time and will initially drop quickly as the devices 24 a , 24 b , and 24 c and the formation F are treated as described above. The skin factor will eventually level off indicating that the optimum cleaning has taken place.
- the number of screening devices can be varied, and one or more additional power modules, acoustic transducers, sensors, and/or control units can be added to the tool 12 .
- the tool 12 can be lowered into the wellbore 10 at any stage relative to the recovery of the fluids from the formation F and can remain connected to the string 14 during the above operation.
- the specific type of acoustic transducer 36 can be varied.
- the control unit 40 can be programmed to adjust the amount of scale accumulation that is necessary for it to actuate the power module 34 .
- the specific location of the above components can be varied.
Abstract
A system and method for removing scale from a device for supporting a gravel pack in a wellbore and for stimulating a formation penetrated by the wellbore, according to which a transducer and a driver for the transducer are mounted on a tool which is lowered into the wellbore in the vicinity of the device. The driver is actuated to vibrate the transducer to remove the scale and stimulate the formation.
Description
- This invention relates to a vibrating device for use in scale removal and formation stimulation in an oil and gas recovery operation.
- In many oil and gas downhole recovery operations, scale, or salt crystal growths, and other foreign materials (collectively referred to as “scale”) are often precipitated during production of the reservoir fluids which can compromise the fluid recovery. For example, in high-rate, high-permeability completions, reservoir fluids are recovered that contain fines, or formation sand. Therefore, support and screening devices, such as screens, slotted liners, and the like, have been utilized to support a gravel pack, or the like, in the well to stabilize the formation while permitting the recovered fluids to pass from the formation into the wellbore while preventing passage of fines or formation sand with the recovered fluids.
- However, scale often accumulates on the devices and must be removed either mechanically, which adds to the labor and cost of the project, or chemically, which may harm the metal parts of the devices and/or cause the dissolved scale to flow into the formation and thus potentially compromise the productivity of the well.
- Also, during the recovery operation from the wellbore, a “skin” develops around the wall of the wellbore which impedes the flow of fluid from the formation requiring stimulation techniques to remove the skin and stimulate the formation.
- Therefore, what is needed is a device of the above type that simultaneously performs the above scale removal and stimulation of the well, yet eliminates the above problems.
-
FIG. 1 is a part diagrammatic, part sectional, and part elevational view of an embodiment of the sand control system of the present invention shown in a downhole environment. -
FIG. 2 is enlarged view of a portion of the system ofFIG. 1 . - Referring to
FIG. 1 , thereference numeral 10 refers to a wellbore penetrating a subterranean ground formation F for the purpose of recovering hydrocarbon fluids from the formation. To this end, and for the purpose of carrying out specific operations to be described, atool 12 is lowered into thewellbore 10 to a predetermined depth by awork string 14, in the form of wire line, coiled tubing, or the like, which is connected to the upper end of thetool 12 in a manner to be described. Thetool 12 is shown generally inFIG. 1 but will be described in detail later. - The
string 14 extends from arig 16 that is located above ground and over thewellbore 10. Therig 16 is conventional and, as such, includes, inter alia, support structure, a motor driven winch, and other associated equipment for receiving and supporting thetool 12 and lowering it to a predetermined depth in thewellbore 10 by unwinding thestring 14 from a reel, or the like, provided on therig 16. - A string of
production tubing 20, having a diameter greater than that of thetool 12, is installed in thewellbore 10 in a conventional manner and extends from the ground surface to a predetermined depth in thewellbore 10. - As better shown in
FIG. 2 , three annular, axially-spaced, gravel pack support andscreening devices wellbore 10 adjacent the formation F. Thedevices devices device wellbore 10, yet allow the fluids recovered from the formation F to pass to and through thedevices wellbore 10, while preventing the passage of fines or sand from the fluids. Since thedevices - The
tool 12 is in the form of a mandrel, orcylindrical body member 30 having several components to be described mounted to it in a conventional manner. A conventional,quick release connector 30 a is mounted on the upper end of thebody member 30 for connecting to the corresponding end of thestring 14 in a manner to permit release of the connection remotely from therig 16. - An
annular flange 30 b extends radially outwardly from the upper end portion of thebody member 30 and, in the operative position of thetool 12 shown inFIG. 2 , engages alanding nipple 32 mounted to the wall of thewellbore 10 in any conventional manner to support thetool 12 in the position shown. - A driver, or
power module 34 is mounted to thetool 12 and either contains a battery pack that provides a source of DC power, or is connected to an electrical conductor for receiving DC power from therig 16. Thepower module 34 is adapted to supply electrical power for reasons to be described. - An
acoustic transducer 36 is mounted on the outside of thebody member 30 and is in the form of an electromechanical transducer that vibrates when it is driven, or excited by electrical power from thepower module 34. Theacoustic transducer 36 can be in the form of a conventional electromechanical transducer, or converter, such as a loudspeaker, tuning fork, cantilever, oval-mode tool, magnetostrictive driver, or piezoelectric transducer. - The frequency, or frequencies, of the output of the
power module 34 is matched to the frequencies of theacoustic transducer 36, so that theacoustic transducer 36 is driven at its resonating frequency. For example, if the desired frequency is above 4 kHz, theacoustic transducer 36 can be in the form of a piezoelectric transducer, such as those marketed under the designation PZT-4 by the Edo Corporation of Salt Lake City, Utah. - In addition to the application of the resonating frequency, the
tool 12 may be coupled with a lower frequency producing device to create the localized pressure drop necessary to dislodge some of the particles. - A
sensor 38 is mounted on thetool 12 and is adapted to remotely sense the accumulation of scale on thedevices sensor 38 can operate in several conventional manners. For example, it can transmit an audio signal in a direction towards thedevices devices devices - A
control unit 40, which can be in the form of a microprocessor, or the like, is mounted to thetool 12 and although not shown in the drawing in the interest of clarity, is electrically connected to thesensor 38 for receiving the above output signals from thesensor 38 corresponding to the scale accumulation on thedevices control unit 40 is also electrically connected to thepower module 34 and is adapted to activate thepower module 34 so that it provides the electrical power to vibrate theacoustic transducer 36. - In operation, and assuming that production fluids are recovered from the formation F, the fluids pass through the
devices wellbore 10 to theproduction tubing 20 for passing to therig 16 for collection, while thedevices tool 12 is lowered into thewellbore 10 before, after, or at any stage during, the above recovery process, until theflange 30 b engages thenipple 32 to locate thetool 12 adjacent the formation F. - The
sensor 38 is activated to sense any accumulation of scale on thedevices control unit 40. Thecontrol unit 40 activates theacoustic transducer 36 when the scale accumulation exceeds a predetermined threshold, and theacoustic transducer 36 functions in the manner discussed above to vibrate continuously, or at a pulsed rate, to an extent that a sympathetic vibration is imparted to thedevices wellbore 10, or it could be circulated, in any conventional manner, to therig 16 for recovery. - The vibration of the
acoustic transducer 36 also stimulates the formation F adjacent thedevices wellbore 10 that can slow the flow of production fluid from the formation F to thewellbore 10. - After the above operations, the
tool 12 can remain in thewellbore 10 adjacent the formation F for later use, or can be removed as needed by lowering thestring 14 into thewellbore 10, reconnecting thestring 14 to theconnector 30 a on thebody member 30, and then raising thetool 12 out of thewellbore 10. As a result of all of the foregoing, the scale accumulating on thedevices devices wellbore 10 is reduced. - The above technique is also applicable when the well is completed open-hole, i.e., with no screens, liners, etc. In this case, scale will accumulate on the wall of the well defining the bore, and can be removed in accordance with the foregoing, i.e. by vibrating the
acoustic transducer 36 continuously or at a pulsed rate when the scale accumulation exceeds a predetermined threshold, to loosen the scale and cause it to fall off the wall. In this situation, it is possible to directly measure the amount of scale on the wall by directly measuring the thickness of the radius of thewellbore 10. This is achieved by using the reflected sonic signal to measure the distance to the wall of the well. This can be done during the operation of theacoustic transducer 36, in which case the thickness of the scale should initially decline quickly and is monitored as a function of time. A stabilized thickness (small change in the radius of the wellbore 10) is an indication that scale removal is complete. - In another mode, both down-hole pressure and rate are monitored. By continuously analyzing the rate and pressure, the cumulative skin factor of the
wellbore 10 is calculated. Skin factor is plotted versus treating time and will initially drop quickly as thedevices - Several variations may be made in the above embodiments without departing from the scope of the invention. For example, the number of screening devices can be varied, and one or more additional power modules, acoustic transducers, sensors, and/or control units can be added to the
tool 12. Also, thetool 12 can be lowered into thewellbore 10 at any stage relative to the recovery of the fluids from the formation F and can remain connected to thestring 14 during the above operation. Further, the specific type ofacoustic transducer 36, as well as thepower module 34 to drive same, can be varied. Still further, thecontrol unit 40 can be programmed to adjust the amount of scale accumulation that is necessary for it to actuate thepower module 34. Moreover, the specific location of the above components can be varied. - The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.
Claims (23)
1. A system for use in a wellbore, comprising:
a tool adapted to be inserted in the wellbore;
a driver mounted to the tool for supplying electrical power; and
a transducer mounted on the outside of the tool and adapted to vibrate in response to the electrical power supplied by the driver.
2. The system of claim 1 further comprising a screening device for supporting a gravel pack in the wellbore, wherein vibration of the transducer removes scale from the screening device.
3. The system of claim 1 wherein vibration of the transducer removes scale from the wall of the wellbore to stimulate a formation penetrated by the wellbore.
4. The system of claim 1 further comprising:
a sensor for sensing scale accumulation and outputting a signal when the scale accumulation exceeds a predetermined value; and
means responsive to the signal for actuating the driver.
5. The system of claim 4 wherein the sensor is mounted on the tool.
6. The system of claim 4 wherein the means comprises a microprocessor connected to the sensor and to the driver.
7. The system of claim 6 wherein the microprocessor is mounted on the tool.
8. The system of claim 1 wherein the transducer is selected from the group consisting of a tuning fork, a cantilever, an oval-mode tool, a magnetostrictive driver, and a piezoelectric transducer.
9. A method of cleaning scale located in a wellbore, comprising the steps of:
providing a tool comprising:
a transducer mounted on the outside of the tool; and
a driver for the transducer;
lowering the tool into the wellbore in the vicinity of the scale; and
actuating the driver to vibrate the transducer to remove the scale.
10. The method of claim 9 wherein the scale is removed from a gravel support device in the wellbore.
11. The method of claim 9 wherein the scale is removed from the wall of the wellbore to stimulate a formation penetrated by the wellbore.
12. The method of claim 9 further comprising the steps of:
sensing scale accumulation;
outputting a signal when the scale accumulation exceeds a predetermined value; and
actuating the driver in response to the outputting of the signal.
13. The method of claim 12 wherein the step of sensing is done by a sensor mounted on the tool.
14. The method of claim 13 wherein the step of actuating comprises the step of connecting the sensor and the driver, to a control unit for actuating the driver when the signal is outputted from the sensor.
15. The method of claim 14 further comprising the step of mounting the control unit on the tool.
16. A system for use in a wellbore, comprising:
a tool adapted to be inserted in the wellbore;
first means mounted to the tool for supplying electrical power; and
second means mounted on the outside of the tool for vibrating in response to the electrical power supplied by the first means.
17. The system of claim 16 further comprising means for supporting a gravel pack in the wellbore, wherein vibration of the second means removes scale from the means for supporting a gravel pack.
18. The system of claim 16 wherein vibration of the second means removes scale from wall of the wellbore to stimulate a formation penetrated by the wellbore.
19. The system of claim 16 further comprising:
means for sensing scale accumulation and outputting a signal when the scale accumulation exceeds a predetermined value; and
means responsive to the signal for actuating the first means.
20. The system of claim 19 wherein the means for sensing is mounted on the tool.
21. The system of claim 19 wherein the means for actuating comprises a microprocessor connected to the means for sensing and to the first means.
22. The system of claim 21 wherein the microprocessor is mounted on the tool.
23. The system of claim 16 wherein the second means is selected from the group consisting of a tuning fork, a cantilever, an oval-mode tool, a magnetostrictive driver, and a piezoelectric transducer.
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US10/634,254 US20050028983A1 (en) | 2003-08-05 | 2003-08-05 | Vibrating system and method for use in scale removal and formation stimulation in oil and gas recovery operations |
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US10/634,254 US20050028983A1 (en) | 2003-08-05 | 2003-08-05 | Vibrating system and method for use in scale removal and formation stimulation in oil and gas recovery operations |
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US10/634,254 Abandoned US20050028983A1 (en) | 2003-08-05 | 2003-08-05 | Vibrating system and method for use in scale removal and formation stimulation in oil and gas recovery operations |
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Cited By (9)
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US20060254766A1 (en) * | 2005-05-13 | 2006-11-16 | Baker Hughes Incorporated | Acoustic inhibition of hydrates, scales and paraffins |
US20110011576A1 (en) * | 2009-07-14 | 2011-01-20 | Halliburton Energy Services, Inc. | Acoustic generator and associated methods and well systems |
US20110094732A1 (en) * | 2003-08-28 | 2011-04-28 | Lehman Lyle V | Vibrating system and method for use in sand control and formation stimulation in oil and gas recovery operations |
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EP2803771A1 (en) * | 2013-05-14 | 2014-11-19 | William C. Frazier | A system and method for monitoring the change in permeablility of a water well |
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