EP0999342A2 - Method and apparatus for controlling actuation of a tool within a subterranean wellbore - Google Patents
Method and apparatus for controlling actuation of a tool within a subterranean wellbore Download PDFInfo
- Publication number
- EP0999342A2 EP0999342A2 EP99308564A EP99308564A EP0999342A2 EP 0999342 A2 EP0999342 A2 EP 0999342A2 EP 99308564 A EP99308564 A EP 99308564A EP 99308564 A EP99308564 A EP 99308564A EP 0999342 A2 EP0999342 A2 EP 0999342A2
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- European Patent Office
- Prior art keywords
- pump
- actuator
- fluid
- well
- tool
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/06—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers
Definitions
- the present invention relates generally to operations performed within subterranean wells and, in an embodiment described herein, more particularly provides apparatus and methods for controlling fluid flow within a subterranean well. More specifically, the invention relates to a downhole hydraulic power source.
- fluid migration has typically been controlled by positioning a production tubing string within the horizontal wellbore intersecting a formation.
- An annulus formed between the wellbore and the tubing string is then packed with gravel.
- a longitudinally spaced apart series of sliding sleeve valves in the tubing string provides fluid communication with selected portions of the formation in relatively close proximity to an open valve, while somewhat restricting fluid communication with portions of the formation at greater distances from an open valve. In this manner, water and gas coning may be reduced in some portions of the formation by closing selected ones of the valves, while not affecting production from other portions of the formation.
- the above method has proved unsatisfactory, inconvenient and inefficient for a variety of reasons.
- the gravel pack in the annulus does not provide sufficient fluid restriction to significantly prevent fluid migration longitudinally through the wellbore.
- an open valve in the tubing string may produce a significant volume of fluid from a portion of the formation longitudinally remote from the valve.
- providing additional fluid restriction in the gravel pack in order to prevent fluid migration longitudinally therethrough would also deleteriously affect production of fluid from a portion of the formation opposite an open valve.
- intervention into the well is typically required to open or close selected ones of the valves.
- intervention usually requires commissioning a slickline rig, wireline rig, coiled tubing rig, or other equipment, and is very time-consuming and expensive to perform.
- well conditions may prevent or hinder these operations.
- a method is provided which utilizes a remotely controllable actuator to operate well tools.
- Associated apparatus is provided as well.
- a method of controlling fluid flow within a subterranean well includes the step of providing a tubing string including a well tool and an actuator.
- the actuator includes a receiver, a pump and an electrical power source.
- the pump is operatively coupled to the power source, causing the pump to deliver pressurized fluid for actuation of the well tool.
- the well tool may be directly operable in response to the delivery of pressurized fluid, or a piston may be utilized to convert the pressurized fluid to a force usable to displace a component of the well tool.
- the actuating step may further comprise displacing the piston in response to the delivery of pressurized fluid, and may further comprise displacing a component of the tool in response to displacement of the piston.
- an apparatus which includes an actuator having at least a pump and a receiver.
- the receiver is utilized to operate the pump in response to reception of a signal.
- the actuator may be interconnected to a plurality of well tools via a control module, which directs the pressurized fluid to selected ones of the well tools.
- a control module which directs the pressurized fluid to selected ones of the well tools.
- apparatus operatively positionable within a subterranean well, the apparatus comprising: an actuator including a receiver, a pump and an electrical power source, the receiver being operable to couple the pump to the power source for operation of the pump in response to a remotely transmitted signal; a well tool; and a fluid conduit interconnecting the pump and the tool.
- the actuator and well tool are interconnected in a tubular string positionable within the well.
- the fluid conduit may extend externally relative to the tubular string.
- the apparatus further comprises a piston, the piston displacing and operating the tool in response to operation of the pump.
- the piston may be included in a hydraulic cylinder interconnected between the actuator and the tool.
- the apparatus includes a plurality of the well tools, and further comprises a control module interconnecting the fluid conduit to each of the well tools.
- the apparatus includes a plurality of the well tools, a plurality of the actuators, and a plurality of the fluid conduits, each of the actuators being interconnected to one of the well tools via a corresponding one of the fluid conduits.
- a remotely controllable well control system In the well control system, at least one well tool is operated in response to reception of a signal by a receiver of at least one actuator.
- the actuator includes a pump, which is operated to deliver pressurized fluid in response to reception of the signal by the receiver.
- a remotely controllable well control system comprising: a tubular string disposed in the well, the tubular string including at least one well tool and at least one actuator, the actuator including a receiver, and the actuator being operable to actuate the well tool in response to a signal transmitted to the receiver from a remote location.
- the actuator further includes a pump, and the pump is operable in response to the signal received by the receiver.
- the actuator further includes an electrical power source, the power source supplying electrical power to a component of the actuatorwhen the signal is received by the receiver.
- the component may be a pump, the pump supplying pressurized fluid to actuate the well tool when the electrical power is supplied thereto by the power source.
- the tubular string includes a plurality of the well tools, and further includes a control module, the control module interconnecting the actuator to a selected one of the well tools in response to reception of the signal by the receiver.
- the tubular string includes a plurality of the well tools and a plurality of the actuators, each of the well tools being operable by one of the actuators.
- FIG. 1 Representatively and schematically illustrated in FIG. 1 is a method 10 which embodies principles of the present invention.
- directional terms such as “above”, “below”, “upper”, “lower”, etc., are used for convenience in referring to the accompanying drawings. Additionally, it is to be understood that the various embodiments of the present invention described herein may be utilized in various orientations, such as inclined, inverted, horizontal, vertical, etc., without departing from the principles of the present invention.
- the method 10 is described herein as it is practiced in an open hole completion of a generally horizontal wellbore portion 12 intersecting a formation 14. However, it is to be clearly understood that methods and apparatus embodying principles of the present invention may be utilized in other environments, such as vertical wellbore portions, cased wellbore portions, etc. Additionally, the method 10 may be performed in wells including both cased and uncased portions, and vertical, inclined and horizontal portions, for example, including the generally vertical portion ofthe well lined with casing 16 and cement 18. Furthermore, the method 10 is described in terms of producing fluid from the well, but the method may also be utilized in injection operations. As used herein, the term "wellbore" is used to indicate an uncased wellbore (such as wellbore 12 shown in FIG. 1), or the interior bore of the casing or liner (such as the casing 16) if the wellbore has casing or liner installed therein.
- steps of the method 10 have been performed which include positioning a tubing string 28 within the wellbore 12.
- the tubing string 28 includes a longitudinally spaced apart series of sealing devices 30, 32, 34 and a longitudinally spaced apart series of flow control devices 36, 38, 40.
- the tubing string 28 extends to the earth's surface, or to another location remote from the wellbore 12, and its distal end is closed by a bull plug 42.
- the sealing devices 30, 32, 34 are representatively and schematically illustrated in FIG. 2 as inflatable packers, which are capable of radially outwardly extending to sealingly engage the wellbore 12 upon application of fluid pressure to the packers.
- inflatable packers which are capable of radially outwardly extending to sealingly engage the wellbore 12 upon application of fluid pressure to the packers.
- packers 30, 32, 34 may be utilized for the packers 30, 32, 34, without departing from the principles of the present invention.
- the packers 30, 32, 34 utilized in the method 10 have been modified somewhat, however, using techniques well within the capabilities of a person of ordinary skill in the art, so that each of the packers is independently inflatable.
- packers 30 and 32 have been inflated, while packer 34 remains deflated.
- a fluid power source is conveyed into the tubing string 28, and fluid is flowed into the packer.
- a fluid power source is conveyed into the tubing string 28, and fluid is flowed into the packer.
- a coiled tubing string 44 has been inserted into the tubing string 28, the coiled tubing string thereby forming a fluid conduit extending to the earth's surface.
- the coiled tubing string 44 includes a latching device 46 and a fluid coupling 48.
- the latching device 46 is of conventional design and is used to positively position the fluid coupling 48 within the selected one of the packers 30, 32, 34.
- each of the packers 30, 32, 34 includes a conventional internal latching profile (not shown in FIG. 2) formed therein.
- the coupling 48 provides fluid communication between the interior of the coiled tubing string 44 and the packer 30, 32, 34 in which it is engaged.
- fluid pressure may be applied to the coiled tubing string 44 and communicated to the packer via the coupling 48.
- Deflation of a previously inflated packer may be accomplished by relieving fluid pressure from within a selected one of the packers 30, 32, 34 via the coupling 48 to the coiled tubing string 44, or to the interior of the tubing string 28, etc. Therefore, it may be clearly seen that each of the packers 30, 32, 34 may be individually and selectively set and unset within the wellbore 12.
- the flow control devices 36, 38, 40 are representatively illustrated as sliding sleeve-type valves. However, it is to be understood that other types of flow control devices may be used for the valves 36, 38, 40, without departing from the principles of the present invention.
- the valves 36, 38, 40 may instead be downhole chokes, pressure operated valves, remotely controllable valves, etc.
- Each of the valves 36, 38, 40 may be opened and closed independently and selectively to thereby permit or prevent fluid flow between the wellbore 12 external to the tubing string 28 and the interior of the tubing string.
- the latching device 46 may be engaged with an internal profile of a selected one of the valves 36, 38, 40 to shift its sleeve to its open or closed position in a conventional manner.
- packers 30 and 32 have been inflated and the valve 36 has been closed, thereby preventing fluid migration through the wellbore 12 between the formation portion 22 and the other portions 20, 24, 26 of the formation 14.
- fluid from the portion 22 may still migrate to the other portions 20, 24, 26 through the formation 14 itself, but such flow through the formation 14 will typically be minimal compared to that which would otherwise be permitted through the wellbore 12.
- flow of fluids from the portion 22 to the interior of the tubing string 28 is substantially restricted by the method 10.
- production of fluid from selected ones of the other portions 20, 24, 26 may also be substantially restricted by inflating other packers, such as packer 34, and closing other valves, such as valves 38 or 40.
- inflation of the packer 30 may be used to substantially restrict production of fluid from the portion 20, without the need to close a valve.
- valve 36 may be opened and the other valves 38, 40 may be closed.
- the method 10 permits each of the packers 30, 32, 34 to be selectively set or unset, and permits each of the valves 36, 38, 40 to be selectively opened or closed, which enables an operator to tailor production from the formation 14 as conditions warrant.
- the use of variable chokes in place of the valves 36, 38, 40 allows even further control over production from each of the portions 20, 22, 24, 26.
- three packers 30, 32, 34 and three valves 36, 38, 40 are used in the method 10 to control production from four portions 20, 22, 24, 26 of the formation 14. It will be readily appreciated that any other number of packers and any number of valves (the number of packers not necessarily being the same as the number of valves) may be used to control production from any number of formation portions, as long as a sufficient number of packers is utilized to prevent flow through the wellbore between each adjacent pair of formation portions. Furthermore, production from additional formations intersected by the wellbore could be controlled by extending the tubing string 28 and providing additional sealing devices and flow control devices therein.
- FIG. 3 another method 50 is schematically and representatively illustrated. Elements of the method 50 which are similar to those previously described are indicated in FIG. 3 using the same reference numbers, with an added suffix "a".
- the power source used to inflate the packers 30a, 32a, 34a is a fluid pump 52 conveyed into the tubing string 28a attached to a wireline or electric line 54 extending to the earth's surface.
- the electric line 54 supplies electricity to operate the pump 52, as well as conveying the latching device 46a, pump, and coupling 48a within the tubing string 28a.
- Other conveyances, such as slickline, coiled tubing, etc. may be used in place of the electric line 54, and electricity may be otherwise supplied to the pump 52, without departing from the principles of the present invention.
- the pump 52 may include a battery, such as the Downhole Power Unit available from Halliburton Energy Services, Inc. of Duncan, Oklahoma.
- the latching device 46a is engaged with the packer 30a, and the coupling 48a is providing fluid communication between the packer and the pump 52.
- Actuation of the pump 52 causes fluid to be pumped into the packer 30a, thereby inflating the packer, so that it sealingly engages the wellbore 12a.
- the packer 34a has been previously inflated in a similar manner. Additionally, the valves 36a, 38a have been closed to restrict fluid flow generally radially therethrough.
- packers 30a, 34a longitudinally straddle two of the formation portions 22a, 24a.
- fluid flow from multiple formation portions may be restricted in keeping with the principles of the present invention.
- another flow control device could be installed in the tubing string 28a above the packer 30a to selectively permit and prevent fluid flow into the tubing string directly from the formation portion 20a while the packer 30a is set within the wellbore 12a.
- FIG. 4 another method 60 embodying principles of the present invention is representatively illustrated. Elements shown in FIG. 4 which are similar to those previously described are indicated using the same reference numbers, with an added suffix "b".
- the method 60 is similar in many respects to the method 50, in that the power source used to set selected ones of the packers 30b, 32b, 34b includes the electric line 54b and a fluid pump 62.
- the pump 62 is interconnected as a part of the tubing string 28b.
- the pump 62 is not separately conveyed into the tubing string 28b, and is not separately engaged with the selected ones of the packers 30b, 32b, 34b by positioning it therein. Instead, fluid pressure developed by the pump 62 is delivered to selected ones of the packers 30b, 32b, 34b and valves 36b, 38b, 40b via lines 64.
- the term "pump” includes any means for pressurizing a fluid.
- the pump 62 could be a motorized rotary or axial pump, a hydraulic accumulator, a device which utilizes a pressure differential between hydrostatic pressure and atmospheric pressure to produce hydraulic pressure, other types of fluid pressurizing devices, etc.
- Fluid pressure from the pump 62 is delivered to the lines 64 as directed by a control module 66 interconnected between the pump and lines.
- control modules are well known in the art and may include a plurality of solenoid valves (not shown) for directing the pump fluid pressure to selected ones of the lines 64, in order to actuate corresponding ones of the packers 30b, 32b, 34b and valves 36b, 38b, 40b.
- the pump 62 is operated to provide fluid pressure to the control module 66, and the control module directs the fluid pressure to an appropriate one of the lines 64 interconnecting the control module to the packer 34b by opening a corresponding solenoid valve in the control module.
- Electricity to operate the pump 62 is supplied by the electric line 54b extending to the earth's surface.
- the electric line 54b is properly positioned by engaging the latching device 46b within the pump 62 or control module 66.
- a wet connect head 68 of the type well known to those of ordinary skill in the art provides an electrical connection between the electric line 54b and the pump 62 and control module 66.
- the electric line 54b may be a slickline or coiled tubing, and electric power may be supplied by a battery installed as a part of the tubing string or conveyed separately therein.
- the pump 62 is of a type which does not require electricity for its operation, an electric power source is not needed.
- the control module 66 directs the fluid pressure from the pump 62 to selected ones of the lines 64 in response to a signal transmitted thereto via the electric line 54b from a remote location, such as the earth's surface.
- the electric line 54b performs several functions in the method 60: conveying the latching device 46b and wet connect head 68 within the tubing string 28b, supplying electric power to operate the pump 62, and transmitting signals to the control module 66.
- valves 36b, 38b, 40b utilized in the method 60 differ from the valves in the previously described methods 10, 50 in that they are pressure actuated.
- Pressure actuated valves are well known in the art. They may be of the type that is actuated to a closed or open position upon application of fluid pressure thereto and return to the alternate position upon release of the fluid pressure by a biasing member, such as a spring, they may be of the type that is actuated to a closed or open position only upon application of fluid pressure thereto, or they may be of any other type.
- the valves 36b, 38b, 40b may be chokes in which a resistance to fluid flow generally radially therethrough is varied by varying fluid pressure applied thereto, or by balancing fluid pressures applied thereto.
- any type of flow control device may be used for the valves 36b, 38b, 40b, without departing from the principles of the present invention.
- FIG. 5 another method 70 embodying principles of the present invention is schematically and representatively illustrated.
- elements which are similar to those previously described are indicated using the same reference numbers, with an added suffix "c".
- the method 70 is substantially similar to the method 60 described above, except that no intervention into the well is used to selectively set or unset the packers 30c, 32c, 34c or to operate the valves 36c, 38c, 40c. Instead, the pump 62c and control module 66c are operated by a receiver 72 interconnected in the tubing string 28c. Power for operation of the receiver 72, pump 62c and control module 66c is supplied by a battery 74 also interconnected in the tubing string 28c. Of course, other types of power sources may be utilized in place of the battery 74. For example, the power source may be an electro-hydraulic generator, wherein fluid flow is utilized to generate electrical power, etc.
- the receiver 72 may be any of a variety of receivers capable of operatively receiving signals transmitted from a remote location.
- the signals may be in the form of acoustic telemetry, radio waves, mud pulses, electromagnetic waves, or any other form of data transmission.
- the receiver 72 is connected to the pump 62c, so that when an appropriate signal is received by the receiver, the pump is operated to provide fluid pressure to the control module 66c.
- the receiver 72 is also connected to the control module 66c, so that when another appropriate signal is received by the receiver, the control module is operated to direct the fluid pressure via the lines 64c to a selected one of the packers 30c, 32c, 34c or valves 36c, 38c, 40c.
- the combined receiver 72, battery 74, pump 62c and control module 66c may be referred to as a common actuator 76 for the sealing devices and flow control devices of the tubing string 28c.
- the receiver 72 has received a signal to operate the pump 62c, and has received a signal for the control module 66c to direct the fluid pressure to the packer 30c.
- the packer 30c has, thus, been inflated and is preventing fluid flow longitudinally through the wellbore 12c between the formation portions 20c and 22c.
- FIG. 6 another method 80 embodying principles of the present invention is schematically and representatively illustrated. Elements of the method 80 which are similar to those previously described are indicated in FIG. 6 with the same reference numbers, with an added suffix "d".
- the method 80 is similar to the previously described method 70. However, instead of a common actuator 76 utilized for selectively actuating the sealing devices and flow control devices, the method 80 utilizes a separate actuator 82, 84, 86 directly connected to a corresponding pair of the packers 30d, 32d, 34d and valves 36d, 38d, 40d. In other words, each of the actuators 82, 84, 86 is interconnected to one of the packers 30d, 32d, 34d, and to one of the valves 36d, 38d, 40d.
- Each of the actuators 82, 84, 86 is a combination of a receiver 72d, battery 74d, pump 62d and control module 66d. Since each actuator 82, 84, 86 is directly connected to its corresponding pair of the packers 30d, 32d, 34d and valves 36d, 38d, 40d, no lines (such as lines 64c, see FIG. 6) are used to interconnect the control modules 66d to their respective packers and valves. However, lines could be provided if it were desired to space one or more of the actuators 82, 84, 86 apart from its corresponding pair of the packers and valves.
- each actuator 82, 84, 86 it is not necessary for each actuator 82, 84, 86 to be connected to a pair of the packers and valves, for example, a separate actuator could be utilized for each packer and for each valve, or for any combination thereof, in keeping with the principles of the present invention.
- the receiver 72d of the actuator 84 has received a signal to operate its pump 62d, and a signal for its control module 66d to direct the fluid pressure developed by the pump to the packer 32d, and then to direct the fluid pressure to the valve 38d.
- the packer 32d is, thus sealingly engaging the wellbore 12d between the formation portions 22d and 24d.
- the receiver 72d of the actuator 86 has received a signal to operate its pump 62d, and a signal for its control module 66d to direct the fluid pressure to the packer 34d. Therefore, the packer 34d is sealingly engaging the wellbore 12d between the formation portions 24d and 26d, and fluid flow is substantially restricted from the formation portion 24d to the interior of the tubing string 28d.
- FIG. 7 another method 90 embodying principles of the present invention is schematically and representatively illustrated. Elements shown in FIG. 7 which are similar to those previously described are indicated using the same reference numbers, with an added suffix "e”.
- the method 90 is similar to the method 70 shown in FIG. 5, in that a single actuator 92 is utilized to selectively actuate the packers 30e, 32e, 34e and valves 36e, 38e, 40e.
- the actuator 92 relies only indirectly on a battery 94 for operation of its fluid pump 96, thus greatly extending the useful life of the battery.
- a receiver 98 and control module 100 of the actuator 92 are connected to the battery 94 for operation thereof.
- the pump 96 is connected via a shaft 102 to an impeller 104 disposed within a fluid passage 106 formed internally in the actuator 92.
- a solenoid valve 108 is interconnected to the fluid passage 106 and serves to selectively permit and prevent fluid flow from the wellbore 12e into an atmospheric gas chamber 110 of the actuator through the fluid passage.
- the valve 108 and control module 100 are operated in response to signals received by the receiver 98. As shown in FIG. 7, the receiver 98 has received a signal to operate the pump 96, and the valve 108 has been opened accordingly. The receiver 98 has also received a signal to operate the control module 100 to direct fluid pressure developed by the pump 96 via the lines 64e to the packer 32e and then to the valve 36e. In this manner, the packer 32e has been inflated to sealingly engage the wellbore 12e and the valve 36e has been closed. Thus, it may be readily appreciated that fluid flow from multiple formation portions 20e and 22e into the tubing string 28e has been substantially restricted, even though only one of the packers 30e, 32e, 34e has been inflated.
- actuator 92 has been described only as an example of the variety of actuators that may be utilized for operation of the packers 30e, 32e, 34e and valves 36e, 38e, 40e.
- an actuator of the type disclosed in U.S. Patent No. 5,127,477 may be used in place of the actuator 92.
- the actuator 92 may be modified extensively without departing from the principles of the present invention.
- the battery 94 and receiver 98 may be eliminated by running a control line 112 from a remote location, such as the earth's surface or another location in the well, to the actuator 92.
- the control line 112 may be connected to the valve 108 and control module 100 for transmitting signals thereto, supplying electrical power, etc. Furthermore, the chamber 110, impeller 104 and valve 108 may be eliminated by delivering power directly from the control line 112 to the pump 100 for operation thereof.
- FIG. 8 another method 120 embodying principles of the present invention is schematically and representatively illustrated.
- elements which are similar to those previously described are indicated using the same reference numbers, with an added suffix "f".
- each packer 30f, 32f, 34f and each valve 36f, 38f, 40f has a corresponding control module 122 connected thereto.
- the control modules 122 are of the type utilized to direct fluid pressure from lines 124 extending to a remote location to actuate equipment to which the control modules are connected.
- the control modules 122 may be SCRAMS modules available from Petroleum Engineering Services of The Woodlands, Texas, and/or as described in U.S. Patent No. 5,547,029. Accordingly, the lines 124 also carry electrical power and transmit signals to the control modules 122 for selective operation thereof.
- the lines 124 may transmit a signal to the control module 122 connected to the packer 30f, causing the control module to direct fluid pressure from the lines to the packer 30f, thereby inflating the packer 30f.
- one control module may be connected to more than one of the packers 30f, 32f, 34f and valves 36f, 38f, 40f in a manner similar to that described in U.S. Patent No. 4,636,934.
- an actuator 126 embodying principles of the present invention is representatively illustrated.
- the actuator 126 may be used to actuate any of the tools described above, such as packers 30, 32, 34, valves 36, 38, 40, flow chokes, etc.
- the actuator 126 may be utilized where it is desired to have an individual actuator actuate a corresponding individual tool, such as in the method 80 described above.
- the actuator 126 includes a generally tubular outer housing 128, a generally tubular inner mandrel 130 and circumferential seals 132.
- the seals 132 sealingly engage both the outer housing 128 and the inner mandrel, and divide the annular space therebetween into three annular chambers 134, 136, 138.
- Each of chambers 134 and 138 initially has a gas, such as air or nitrogen, contained therein at atmospheric pressure or another relatively low pressure. Hydrostatic pressure within a well is permitted to enter the chamber 136 via openings 140 formed through the housing 128.
- the outer housing 128 will be biased downwardly relative to the mandrel 130.
- biasing force may be utilized to actuate a tool, for example, a packer, valve or choke, connected to the actuator 126.
- a mandrel of a conventional packer which is set by applying a downwardly directed force to the packer mandrel may be connected to the housing 128 so that, when the housing is downwardly displaced relative to the inner mandrel 130 by the downwardly biasing force, the packer will be set.
- the actuator 126 may be connected to a valve, for example, to displace a sleeve or other closure element of the valve, and thereby open or close the valve.
- a valve for example, to displace a sleeve or other closure element of the valve, and thereby open or close the valve.
- the housing 128 or the mandrel 130, or both of them may be interconnected in a tubular string for conveying the actuator 126 in the well, and either the housing or the mandrel, or both of them, may be attached to the tool for actuation thereof.
- the actuator 126 may be otherwise conveyed, for example, by slickline, etc., without departing from the principles of the present invention.
- devices 142, 144 for releasing the housing 128 and mandrel 130 for relative displacement therebetween are representatively illustrated.
- Each of the devices 142, 144 permits the actuator 126 to be lowered into a well with increasing hydrostatic pressure, without the housing 128 displacing relative to the mandrel 130, until the device is triggered, at which time the housing and mandrel are released for displacement relative to one another.
- an annular recess 146 is formed internally on the housing 128.
- a tumbler or stop member 148 extends outward through an opening 150 formed in the mandrel 130 and into the recess 146. In this position, the tumbler 148 prevents downward displacement of the housing 128 relative to the mandrel 130. The tumbler 148 is maintained in this position by a retainer member 152.
- a detent pin or lug 154 engages an external shoulder 156 formed on the mandrel 130 and prevents displacement of the retainer 152 relative to the tumbler 148.
- An outer release sleeve or blocking member 158 prevents disengagement of the detent pin 154 from the shoulder 156.
- a solenoid 160 permits the release sleeve 158 to be displaced, so that the detent pin 154 is released, the retainer is permitted to displace relative to the tumbler 148, and the tumbler is permitted to disengage from the recess 146, thereby releasing the housing 128 for displacement relative to the mandrel 130.
- the solenoid 160 is activated to displace the release sleeve 158 in response to a signal received by a receiver, such as receivers 72, 98 described above.
- lines 162 may be interconnected to a receiver and battery as described above for the actuator 76 in the methods 70, 80, or for the actuator 92 in the method 90.
- electrical power may be supplied to the lines 162 via a wet connect head, such as the wet connect head 68 in the method 60.
- FIG. 11 it may be seen that the recess 146 is engaged by a piston 164 extending outwardly from a fluid-filled chamber 166 formed in the mandrel 130. Fluid in the chamber 166 prevents the piston 164 from displacing inwardly out of engagement with the recess 146.
- a valve 168 selectively permits fluid to be vented from the chamber 166, thereby permitting the piston 164 to disengage from the recess, and permitting the housing 128 to displace relative to the mandrel 130.
- the valve 168 may be a solenoid valve or other type of valve which permits fluid to flow therethrough in response to an electrical signal on lines 170.
- the valve 168 may be interconnected to a receiver and/or battery in a manner similar to the solenoid 160 described above.
- the valve 168 may be remotely actuated by transmission of a signal to a receiver connected thereto, or the valve may be directly actuated by coupling an electrical power source to the lines 170.
- other manners of venting fluid from the chamber 166 may be utilized without departing from the principles of the present invention.
- the actuator 172 includes a generally tubular outer housing 174 and a generally tubular inner mandrel 176. Circumferential seals 178 sealingly engage the housing 174 and mandrel 176, isolating annular chambers 180, 182, 184 formed between the housing and mandrel.
- Chamber 180 is substantially filled with a fluid, such as oil.
- a valve 186 similar to valve 168 described above, permits the fluid. to be selectively vented from the chamber 180 to the exterior of the actuator 172.
- the valve 186 is closed, the housing 174 is prevented from displacing downward relative to the mandrel 176.
- the valve 186 is opened, such as by using any of the methods described above for opening the valve 168, the fluid is permitted to flow out of the chamber 180 and the housing 174 is permitted to displace downwardly relative to the mandrel 176.
- the housing 174 is biased downwardly due to a difference in pressure between the chambers 182, 184.
- the chamber 182 is exposed to hydrostatic pressure via an opening 188 formed through the housing 174.
- the chamber 184 contains a gas, such as air or nitrogen at atmospheric or another relatively low pressure.
- the actuator 190 is similar in many respects to the previously described actuator 172. However, the actuator 190 has additional chambers for increasing its force output, and includes a combined valve and choke 196 for regulating the rate at which its housing 192 displaces relative to its mandrel 194.
- the valve and choke 196 may be a combination of a solenoid valve, such as valves 168, 186 described above, and an orifice or other choke member, or it may be a variable choke having the capability of preventing fluid flow therethrough or of metering such fluid flow. If the valve and choke 196 includes a variable choke, the rate at which fluid is metered therethrough may be adjusted by correspondingly adjusting an electrical signal applied to lines 198 connected thereto.
- Annular chambers 200, 202, 204, 206, 208 are formed between the housing 192 and the mandrel 194.
- the chambers 200, 202, 204, 206, 208 are isolated from each other by circumferential seals 210.
- the chambers 202, 206 are exposed to hydrostatic pressure via openings 212 formed through the housing 192.
- the chambers 200, 204 contain a gas, such as air or nitrogen at atmospheric or another relatively low pressure. The use of multiple sets of chambers permits a larger force to be generated by the actuator 190 in a given annular space.
- a fluid such as oil
- the valve/choke 196 regulates venting of the fluid from the chamber 208 to the exterior of the actuator 190.
- the valve/choke 196 When the valve/choke 196 is opened, the fluid in the chamber 208 is permitted to escape therefrom, thereby permitting the housing 192 to displace relative to the mandrel 194.
- a larger or smaller orifice may be selected to correspondingly increase or decrease the rate at which the housing 192 displaces relative to the mandrel 194 when the fluid is vented from the chamber 208, or the electrical signal on the lines 198 may be adjusted to correspondingly vary the rate of fluid flow through the valve/choke 196 if it includes a variable choke.
- FIG. 14 another actuator 214 embodying principles of the present invention is representatively illustrated.
- the actuator 214 is similar in many respects to the actuator 172 described above. However, the actuator 214 utilizes an increased piston area associated with its annular gas chamber 216 in order to increase the force output by the actuator.
- the actuator 214 includes the chamber 216 and annular chambers 218, 220 formed between an outer generally tubular housing 222 and an inner generally tubular mandrel 224. Circumferential seals 226 sealingly engage the mandrel 224 and the housing 222.
- the chamber 216 contains gas, such as air or nitrogen, at atmospheric or another relatively low pressure, the chamber 218 is exposed to hydrostatic pressure via an opening 228 formed through the housing 222, and the chamber 220 contains a fluid, such as oil.
- a valve 230 selectively permits venting of the fluid in the chamber 220 to the exterior of the actuator 214.
- the housing 222 is prevented by the fluid in the chamber 220 from displacing relative to the mandrel 224.
- the valve 230 is opened, for example, by applying an appropriate electrical signal to lines 231, the fluid in the chamber 220 is vented, thereby permitting the housing 222 to displace relative to the mandrel 224.
- each of the actuators 126, 172, 190, 214 has been described above as if the housing and/or mandrel thereof is connected to the packer, valve, choke, tool, item of equipment, flow control device, etc. which is desired to be actuated.
- each of the actuators 126, 172, 190, 214 may be otherwise connected or attached to the tool(s) or item(s) of equipment, without departing from the principles of the present invention.
- the output of each of valves 168, 186, 196, 230 may be connected to any hydraulically actuated tool(s) or item(s) of equipment for actuation thereof.
- each of the actuators 126, 172, 190, 214 may serve as the actuator or fluid power source in the methods 50, 60, 70, 80,120.
- the container 232 may be utilized to store a gas at atmospheric or another relatively low pressure downhole.
- the container 232 is utilized in the actuation of one or more tools or items of equipment downhole.
- the container 232 includes a generally tubular inner housing 234 and a generally tubular outer housing 236.
- An annular chamber 238 is formed between the inner and outer housings 234, 236.
- the annular chamber 238 contains a gas, such as air or nitrogen, at atmospheric or another relatively low pressure.
- the container 232 includes a series of circumferentially spaced apart and longitudinally extending ribs or rods 240.
- the ribs 240 are spaced equidistant from each other, but that is not necessary, as shown in FIG. 15.
- the ribs 240 significantly increase the ability of the outer housing 236 to resist collapse due to pressure applied externally thereto.
- the ribs 240 contact both the outer housing 236 and the inner housing 234, so that radially inwardly directed displacement of the outer housing 236 is resisted by the inner housing 234.
- the container 232 is well suited for use in high pressure downhole environments.
- the apparatus 242 demonstrates use of the container 232 along with a fluid power source 244, such as any of the pumps and/or actuators described above which are capable of producing an elevated fluid pressure, to control actuation of a tool 246.
- a fluid power source 244 such as any of the pumps and/or actuators described above which are capable of producing an elevated fluid pressure, to control actuation of a tool 246.
- the tool 246 is representatively illustrated as including a generally tubular outer housing 248 sealingly engaged and reciprocably disposed relative to a generally tubular inner mandrel 250. Annular chambers 252, 254 are formed between the housing 248 and mandrel 250. Fluid pressure in the chamber 252 greater than fluid pressure in the chamber 254 will displace the housing 248 to the left relative to the mandrel 250 as viewed in FIG. 16, and fluid pressure in the chamber 254 greater than fluid pressure in the chamber 252 will displace the housing 248 to the right relative to the mandrel 250 as viewed in FIG. 16. Of course, either or both of the housing 248 and mandrel 250 may displace in actual practice. It is to be clearly understood that the tool 246 is merely representative of tools, such as packers, valves, chokes, etc., which may be operated by fluid pressure applied thereto.
- one of the chambers 252, 254 is vented to the container 232, and the other chamber is opened to the fluid power source 244.
- a valve 256 between the fluid power source 244 and the chamber 254 is opened, and a valve 258 between the container 232 and the chamber 252 is opened.
- the resulting pressure differential between the chambers 252, 254 causes the housing 248 to displace to the right relative to the mandrel 250.
- valve 260 between the fluid power source 244 and the chamber 252 is opened, and a valve 262 between the container 232 and the chamber 254 is opened.
- the valves 260, 262 are closed when the housing 248 is displaced to the right relative to the mandrel, and the valves 256, 258 are closed when the housing is displaced to the left relative to the mandrel.
- the tool 246 may, thus, be repeatedly actuated by alternately connecting each of the chambers 252, 254 to the fluid power source 244 and the container 232.
- valves 256, 258, 260, 262 are representatively illustrated in FIG. 16 as being separate electrically actuated valves, but it is to be understood that any type of valves may be utilized without departing from the principles of the present invention.
- the valves 256, 258, 260, 262 may be replaced by two appropriately configured conventional two-way valves, etc.
- the tool 246 may be used to actuate another tool, without departing from the principles of the present invention.
- the mandrel 250 may be attached to a packer mandrel, so that when the mandrel 250 is displaced in one direction relative to the housing 248, the packer is set, and when the mandrel 250 is displaced in the other direction relative to the housing 248, the packer is unset.
- the housing 248 or mandrel 250 may be interconnected in a tubular string for conveyance within a well.
- fluid power source 244 may alternatively be another source of fluid at a pressure greater than that of the gas or other fluid in the container 232, without the pressure of the delivered fluid being elevated substantially above hydrostatic pressure in the well.
- element 244 shown in FIG. 16 may be a source of fluid at hydrostatic pressure.
- the fluid source 244 may be the well annulus surrounding the apparatus 242 when it is disposed in the well; it may be the interior of a tubular string to which the apparatus is attached; it may originate in a chamber conveyed into the well with, or separate from, the apparatus; if conveyed into the well in a chamber, the chamber may be a collapsible or elastic bag, or the chamber may include an equalizing piston separating clean fluid for delivery to the tool 246 from fluid in the well; the fluid source may include fluid processing features, such as a fluid filter, etc.
- the fluid source 244 may deliver fluid at greater than, less than and/or equal to hydrostatic pressure.
- the apparatus 264 includes multiple tools 266, 268, 270 having generally tubular outer housings 272, 274, 276 sealingly engaged with generally tubular inner mandrels 278, 280, 282, thereby forming annular chambers 284, 286, 288 therebetween, respectively.
- the tools 266, 268, 270 are merely representative of the wide variety of packers, valves, chokes, and other flow control devices, items of equipment and tools which may be actuated using the apparatus 264.
- displacement of each of the housings 272, 274, 276 relative to corresponding ones of the mandrels 278, 280, 282 may be utilized to actuate associated flow control devices, items of equipment and tools attached thereto.
- the apparatus 264 including the container 232 and the tool 266 may be interconnected in a tubular string, with the tool 266 attached to a packer mandrel, such that when the housing 272 is displaced relative to the mandrel 278, the packer is set.
- Valves 290, 292, 294 initially isolate each of the chambers 284, 286, 288, respectively, from communication with the chamber 238 of the container 232.
- Each of the chambers 284, 286, 288 is initially substantially filled with a fluid, such as oil.
- a fluid such as oil.
- hydrostatic pressure in the well acts to pressurize the fluid in the chambers 284, 286, 288.
- the fluid prevents each of the housings 272, 274, 276 from displacing substantially relative to its corresponding mandrel 278, 280, 282.
- the chamber 238 is substantially filled with a gas, such as air or nitrogen at atmospheric or another relatively low pressure. Hydrostatic pressure in the well will displace the corresponding housing 272, 274, 276 relative to the corresponding mandrel 278, 280, 282, forcing the fluid in the corresponding chamber 284, 286, 288 to flow through the corresponding valve 290, 292, 294 and into the container 232. Such displacement may be readily stopped by closing the corresponding valve 290, 292, 294.
- valves 290, 292, 294 Operation of the valves 290, 292, 294 may be controlled by any of the methods described above.
- the valves 290, 292, 294 may be connected to an electrical power source conveyed into the well on slickline, wireline or coiled tubing, a receiver may be utilized to receive a remotely transmitted signal whereupon the valves are connected to an electrical power source, such as a battery, downhole, etc.
- an electrical power source such as a battery, downhole, etc.
- other methods of operating the valves 290, 292, 294 may be utilized without departing from the principles of the present invention.
- the valve 290 may be a solenoid valve.
- the valve 292 may be a fusible plug-type valve (a valve openable by dissipation of a plug blocking fluid flow through a passage therein), such as that available from BEI.
- the valve 294 may be a valve/choke, such as the valve/choke 196 described above.
- any type of valve may be used for each of the valves 290, 292, 294.
- the apparatus 296 includes the receiver 72, battery 74 and pump 62 described above, combined in an individual actuator or hydraulic power source 298 connected via a fluid conduit or line 300 to a tool or item of equipment 302, such as a packer, valve, choke, or other flow control device.
- the line 300 may be internally or externally provided, and the actuator 298 may be constructed with the tool 302, with no separation therebetween.
- the apparatus 296 is depicted interconnected as a part of a tubular string 304 installed in a well.
- a signal is transmitted from a remote location, such as the earth's surface or another location within the well, to the receiver 72.
- the pump 62 is supplied electrical power from the battery 74, so that fluid at an elevated pressure is transmitted via the line 300 to the tool 302, for example, to set or unset a hydraulic packer, open or close a valve, vary a choke flow restriction, etc.
- the representatively illustrated tool 302 is of the type which is responsive to fluid pressure applied thereto.
- an apparatus 306 embodying principles of the present invention is representatively illustrated.
- the apparatus 306 is similar in many respects to the apparatus 296 described above, however, a tool 308 of the apparatus 306 is of the type responsive to force applied thereto, such as a packer set by applying an axial force to a mandrel thereof, or a valve opened or closed by displacing a sleeve or other blocking member therein.
- a signal is transmitted from a remote location, such as the earth's surface or another location within the well, to the receiver 72.
- the pump 62 is supplied electrical power from the battery 74, so that fluid at an elevated pressure is transmitted via the line 300 to a hydraulic cylinder 310 interconnected between the tool 308 and the actuator 298.
- the cylinder 310 includes a piston 312 therein which displaces in response to fluid pressure in the line 300. Such displacement of the piston 312 operates the tool 308, for example, displacing a mandrel of a packer, opening or closing a valve, varying a choke flow restriction, etc.
- each of the valves 168, 186, 196, 230, 256, 258, 260, 262, 290, 292, 294 may be other than a solenoid valve, such as a pilot-operated valve, and any of the actuators, pumps, control modules, receivers, packers, valves, etc. may be differently configured or interconnected, without departing from the principles of the present invention.
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Abstract
Description
- The present invention relates generally to operations performed within subterranean wells and, in an embodiment described herein, more particularly provides apparatus and methods for controlling fluid flow within a subterranean well. More specifically, the invention relates to a downhole hydraulic power source.
- In horizontal well open hole completions, fluid migration has typically been controlled by positioning a production tubing string within the horizontal wellbore intersecting a formation. An annulus formed between the wellbore and the tubing string is then packed with gravel. A longitudinally spaced apart series of sliding sleeve valves in the tubing string provides fluid communication with selected portions of the formation in relatively close proximity to an open valve, while somewhat restricting fluid communication with portions of the formation at greater distances from an open valve. In this manner, water and gas coning may be reduced in some portions of the formation by closing selected ones of the valves, while not affecting production from other portions of the formation.
- Unfortunately, the above method has proved unsatisfactory, inconvenient and inefficient for a variety of reasons. First, the gravel pack in the annulus does not provide sufficient fluid restriction to significantly prevent fluid migration longitudinally through the wellbore. Thus, an open valve in the tubing string may produce a significant volume of fluid from a portion of the formation longitudinally remote from the valve. However, providing additional fluid restriction in the gravel pack in order to prevent fluid migration longitudinally therethrough would also deleteriously affect production of fluid from a portion of the formation opposite an open valve.
- Second, it is difficult to achieve a uniform gravel pack in horizontal well completions. In many cases the gravel pack will be less dense and/or contain voids in the upper portion of the annulus. This situation results in a substantially unrestricted longitudinal flow path for migration of fluids in the wellbore.
- Third, in those methods which utilize the spaced apart series of sliding sleeve valves, intervention into the well is typically required to open or close selected ones of the valves. Such intervention usually requires commissioning a slickline rig, wireline rig, coiled tubing rig, or other equipment, and is very time-consuming and expensive to perform. Furthermore, well conditions may prevent or hinder these operations.
- Therefore, it would be advantageous to provide a method of controlling fluid flow within a subterranean well, which method does not rely on a gravel pack for restricting fluid flow longitudinally through the wellbore. Additionally, it would be advantageous to provide associated apparatus which permits an operator to produce or inject fluid from or into a selected portion of a formation intersected by the well. These methods and apparatus would be useful in open hole, as well as cased hole, completions.
- It would also be advantageous to provide a method of controlling fluid flow within a well, which does not require intervention into the well for its performance. Such method would permit remote control of the operation, without the need to kill the well or pass equipment through the wellbore.
- In carrying out the principles of the present invention, in accordance with an embodiment thereof, a method is provided which utilizes a remotely controllable actuator to operate well tools. Associated apparatus is provided as well.
- In one aspect of the present invention, a method of controlling fluid flow within a subterranean well is provided which includes the step of providing a tubing string including a well tool and an actuator. The actuator includes a receiver, a pump and an electrical power source. When a remotely transmitted signal is received by the receiver, the pump is operatively coupled to the power source, causing the pump to deliver pressurized fluid for actuation of the well tool.
- The well tool may be directly operable in response to the delivery of pressurized fluid, or a piston may be utilized to convert the pressurized fluid to a force usable to displace a component of the well tool. In the latter case, the actuating step may further comprise displacing the piston in response to the delivery of pressurized fluid, and may further comprise displacing a component of the tool in response to displacement of the piston.
- In another aspect of the present invention, an apparatus is provided which includes an actuator having at least a pump and a receiver. The receiver is utilized to operate the pump in response to reception of a signal. The actuator may be interconnected to a plurality of well tools via a control module, which directs the pressurized fluid to selected ones of the well tools. Alternatively, there may be a plurality of the actuators interconnected to corresponding ones of the plurality of well tools.
- According to another aspect of the invention there is provided apparatus operatively positionable within a subterranean well, the apparatus comprising: an actuator including a receiver, a pump and an electrical power source, the receiver being operable to couple the pump to the power source for operation of the pump in response to a remotely transmitted signal; a well tool; and a fluid conduit interconnecting the pump and the tool.
- In an embodiment, the actuator and well tool are interconnected in a tubular string positionable within the well. The fluid conduit may extend externally relative to the tubular string.
- In an embodiment, the apparatus further comprises a piston, the piston displacing and operating the tool in response to operation of the pump. The piston may be included in a hydraulic cylinder interconnected between the actuator and the tool.
- In an embodiment, the apparatus includes a plurality of the well tools, and further comprises a control module interconnecting the fluid conduit to each of the well tools.
- In an embodiment, the apparatus includes a plurality of the well tools, a plurality of the actuators, and a plurality of the fluid conduits, each of the actuators being interconnected to one of the well tools via a corresponding one of the fluid conduits.
- In still another aspect of the present invention, a remotely controllable well control system is provided. In the well control system, at least one well tool is operated in response to reception of a signal by a receiver of at least one actuator. The actuator includes a pump, which is operated to deliver pressurized fluid in response to reception of the signal by the receiver.
- According to another aspect of the invention there is provided a remotely controllable well control system comprising: a tubular string disposed in the well, the tubular string including at least one well tool and at least one actuator, the actuator including a receiver, and the actuator being operable to actuate the well tool in response to a signal transmitted to the receiver from a remote location.
- In an embodiment, the actuator further includes a pump, and the pump is operable in response to the signal received by the receiver.
- In an embodiment, the actuator further includes an electrical power source, the power source supplying electrical power to a component of the actuatorwhen the signal is received by the receiver. The component may be a pump, the pump supplying pressurized fluid to actuate the well tool when the electrical power is supplied thereto by the power source.
- In an embodiment, the tubular string includes a plurality of the well tools, and further includes a control module, the control module interconnecting the actuator to a selected one of the well tools in response to reception of the signal by the receiver.
- In an embodiment, the tubular string includes a plurality of the well tools and a plurality of the actuators, each of the well tools being operable by one of the actuators.
- Reference is now made to the accompanying drawings, in which:
- FIG. 1 is a schematicized cross-sectional view of a subterranean well;
- FIG. 2 is a schematicized partially cross-sectional and partially elevational view of the well of FIG. 1, in which steps of a first embodiment of a method according to the present invention have been performed;
- FIG. 3 is a schematicized partially cross-sectional and partially elevational view of the well of FIG. 1, in which steps of a second embodiment of a method according to the present invention have been performed;
- FIG. 4 is a schematicized partially cross-sectional and partially elevational view of the well of FIG. 1, in which steps of a third embodiment of a method according to the present invention have been performed;
- FIG. 5 is a schematicized partially cross-sectional and partially elevational view of the well of FIG. 1, in which steps of a fourth embodiment of a method according to the present invention have been performed;
- FIG. 6 is a schematicized partially cross-sectional and partially elevational view of the well of FIG. 1, in which steps of a fifth embodiment of a method according to the present invention have been performed;
- FIG. 7 is a schematicized partially cross-sectional and partially elevational view of the well of FIG. 1, in which steps of a sixth embodiment of a method according to the present invention have been performed;
- FIG. 8 is a schematicized partially cross-sectional and partially elevational view of the well of FIG. 1, in which steps of a seventh embodiment of a method according to the present invention have been performed;
- FIG. 9 is a schematicized cross-sectional view of a first embodiment of an apparatus according to the present invention;
- FIG. 10 is a schematicized quarter-sectional view of a first embodiment of a release device according to the present invention which may be used with the first apparatus;
- FIG. 11 is a schematicized quarter-sectional view of a second embodiment of a release device according to the present invention which may be used with the first apparatus;
- FIG. 12 is a schematicized quarter-sectional view of a second embodiment of an apparatus according to the present invention;
- FIG. 13 is a schematicized quarter-sectional view of a third embodiment of an apparatus according to the present invention;
- FIG. 14 is a schematicized quarter-sectional view of a fourth embodiment of an apparatus according to the present invention;
- FIG. 15 is a cross-sectional view of an embodiment of an atmospheric chamber according to the present invention;
- FIG. 16 is a schematicized view of a fifth embodiment of an apparatus according to the present invention;
- FIG. 17 is a schematicized view of a sixth embodiment of an apparatus according to the present invention;
- FIG. 18 is a schematicized elevational view of a seventh embodiment of an apparatus according to the present invention; and
- FIG. 19 is a schematicized elevational view of an eighth embodiment of an apparatus according to the present invention.
-
- Representatively and schematically illustrated in FIG. 1 is a
method 10 which embodies principles of the present invention. In the following description of themethod 10 and other apparatus and methods described herein, directional terms, such as "above", "below", "upper", "lower", etc., are used for convenience in referring to the accompanying drawings. Additionally, it is to be understood that the various embodiments of the present invention described herein may be utilized in various orientations, such as inclined, inverted, horizontal, vertical, etc., without departing from the principles of the present invention. - The
method 10 is described herein as it is practiced in an open hole completion of a generallyhorizontal wellbore portion 12 intersecting aformation 14. However, it is to be clearly understood that methods and apparatus embodying principles of the present invention may be utilized in other environments, such as vertical wellbore portions, cased wellbore portions, etc. Additionally, themethod 10 may be performed in wells including both cased and uncased portions, and vertical, inclined and horizontal portions, for example, including the generally vertical portion ofthe well lined withcasing 16 andcement 18. Furthermore, themethod 10 is described in terms of producing fluid from the well, but the method may also be utilized in injection operations. As used herein, the term "wellbore" is used to indicate an uncased wellbore (such aswellbore 12 shown in FIG. 1), or the interior bore of the casing or liner (such as the casing 16) if the wellbore has casing or liner installed therein. - It will be readily appreciated by a person of ordinary skill in the art that if the well shown in FIG. 1 is completed in a conventional manner utilizing gravel surrounding a production tubing string including longitudinally spaced apart screens and/or sliding sleeve valves, fluid from various
longitudinal portions formation 14 will be permitted to migrate longitudinally through the gravel pack in the annular space between the tubing string and thewellbore 12. Of course, a sliding sleeve valve may be closed in an attempt to restrict fluid production from one of theformation portions - Referring additionally now to FIG. 2, steps of the
method 10 have been performed which include positioning atubing string 28 within thewellbore 12. Thetubing string 28 includes a longitudinally spaced apart series of sealingdevices flow control devices tubing string 28 extends to the earth's surface, or to another location remote from thewellbore 12, and its distal end is closed by abull plug 42. - The sealing
devices wellbore 12 upon application of fluid pressure to the packers. Of course, other types of packers, such as production packers settable by pressure, may be utilized for thepackers packers method 10 have been modified somewhat, however, using techniques well within the capabilities of a person of ordinary skill in the art, so that each of the packers is independently inflatable. Thus, as shown in FIG. 2,packers packer 34 remains deflated. - In order to inflate a selected one of the
packers tubing string 28, and fluid is flowed into the packer. For example, in FIG. 2 acoiled tubing string 44 has been inserted into thetubing string 28, the coiled tubing string thereby forming a fluid conduit extending to the earth's surface. - At its distal end, the coiled
tubing string 44 includes a latchingdevice 46 and afluid coupling 48. The latchingdevice 46 is of conventional design and is used to positively position thefluid coupling 48 within the selected one of thepackers packers - The
coupling 48 provides fluid communication between the interior of the coiledtubing string 44 and thepacker coupling 48 is engaged within thepacker 30 as shown in FIG. 2, fluid pressure may be applied to the coiledtubing string 44 and communicated to the packer via thecoupling 48. Deflation of a previously inflated packer may be accomplished by relieving fluid pressure from within a selected one of thepackers coupling 48 to the coiledtubing string 44, or to the interior of thetubing string 28, etc. Therefore, it may be clearly seen that each of thepackers wellbore 12. - The
flow control devices valves valves - Each of the
valves tubing string 28 and the interior of the tubing string. For example, the latchingdevice 46 may be engaged with an internal profile of a selected one of thevalves - As representatively depicted in FIG. 2,
packers valve 36 has been closed, thereby preventing fluid migration through thewellbore 12 between theformation portion 22 and theother portions formation 14. Note that fluid from theportion 22 may still migrate to theother portions formation 14 itself, but such flow through theformation 14 will typically be minimal compared to that which would otherwise be permitted through thewellbore 12. Thus, flow of fluids from theportion 22 to the interior of thetubing string 28 is substantially restricted by themethod 10. It will be readily appreciated that production of fluid from selected ones of theother portions packer 34, and closing other valves, such asvalves packer 30 may be used to substantially restrict production of fluid from theportion 20, without the need to close a valve. - If, however, it is desired to produce fluid substantially only from the
portion 22, thevalve 36 may be opened and theother valves method 10 permits each of thepackers valves formation 14 as conditions warrant. The use of variable chokes in place of thevalves portions - As shown in FIG. 2, three
packers valves method 10 to control production from fourportions formation 14. It will be readily appreciated that any other number of packers and any number of valves (the number of packers not necessarily being the same as the number of valves) may be used to control production from any number of formation portions, as long as a sufficient number of packers is utilized to prevent flow through the wellbore between each adjacent pair of formation portions. Furthermore, production from additional formations intersected by the wellbore could be controlled by extending thetubing string 28 and providing additional sealing devices and flow control devices therein. - Referring additionally now to FIG. 3, another
method 50 is schematically and representatively illustrated. Elements of themethod 50 which are similar to those previously described are indicated in FIG. 3 using the same reference numbers, with an added suffix "a". - The
method 50 is in many respects similar to themethod 10. However, in themethod 50, the power source used to inflate thepackers fluid pump 52 conveyed into thetubing string 28a attached to a wireline orelectric line 54 extending to the earth's surface. Theelectric line 54 supplies electricity to operate thepump 52, as well as conveying thelatching device 46a, pump, andcoupling 48a within thetubing string 28a. Other conveyances, such as slickline, coiled tubing, etc., may be used in place of theelectric line 54, and electricity may be otherwise supplied to thepump 52, without departing from the principles of the present invention. For example, thepump 52 may include a battery, such as the Downhole Power Unit available from Halliburton Energy Services, Inc. of Duncan, Oklahoma. - As depicted in FIG. 3, the
latching device 46a is engaged with thepacker 30a, and thecoupling 48a is providing fluid communication between the packer and thepump 52. Actuation of thepump 52 causes fluid to be pumped into thepacker 30a, thereby inflating the packer, so that it sealingly engages thewellbore 12a. Thepacker 34a has been previously inflated in a similar manner. Additionally, thevalves - Note that the
packers formation portions tubing string 28a above thepacker 30a to selectively permit and prevent fluid flow into the tubing string directly from theformation portion 20a while thepacker 30a is set within thewellbore 12a. - Referring additionally now to FIG. 4, another
method 60 embodying principles of the present invention is representatively illustrated. Elements shown in FIG. 4 which are similar to those previously described are indicated using the same reference numbers, with an added suffix "b". - The
method 60 is similar in many respects to themethod 50, in that the power source used to set selected ones of thepackers electric line 54b and afluid pump 62. However, in this case thepump 62 is interconnected as a part of thetubing string 28b. Thus, thepump 62 is not separately conveyed into thetubing string 28b, and is not separately engaged with the selected ones of thepackers pump 62 is delivered to selected ones of thepackers valves lines 64. - As used herein, the term "pump" includes any means for pressurizing a fluid. For example, the
pump 62 could be a motorized rotary or axial pump, a hydraulic accumulator, a device which utilizes a pressure differential between hydrostatic pressure and atmospheric pressure to produce hydraulic pressure, other types of fluid pressurizing devices, etc. - Fluid pressure from the
pump 62 is delivered to thelines 64 as directed by acontrol module 66 interconnected between the pump and lines. Such control modules are well known in the art and may include a plurality of solenoid valves (not shown) for directing the pump fluid pressure to selected ones of thelines 64, in order to actuate corresponding ones of thepackers valves packer 34b, thepump 62 is operated to provide fluid pressure to thecontrol module 66, and the control module directs the fluid pressure to an appropriate one of thelines 64 interconnecting the control module to thepacker 34b by opening a corresponding solenoid valve in the control module. - Electricity to operate the
pump 62 is supplied by theelectric line 54b extending to the earth's surface. Theelectric line 54b is properly positioned by engaging the latching device 46b within thepump 62 orcontrol module 66. Awet connect head 68 of the type well known to those of ordinary skill in the art provides an electrical connection between theelectric line 54b and thepump 62 andcontrol module 66. Alternatively, theelectric line 54b may be a slickline or coiled tubing, and electric power may be supplied by a battery installed as a part of the tubing string or conveyed separately therein. Of course, if thepump 62 is of a type which does not require electricity for its operation, an electric power source is not needed. - The
control module 66 directs the fluid pressure from thepump 62 to selected ones of thelines 64 in response to a signal transmitted thereto via theelectric line 54b from a remote location, such as the earth's surface. Thus, theelectric line 54b performs several functions in the method 60: conveying the latching device 46b andwet connect head 68 within thetubing string 28b, supplying electric power to operate thepump 62, and transmitting signals to thecontrol module 66. Of course, it is not necessary for theelectric line 54b to perform all of these functions, and these functions may be performed by separate elements, without departing from the principles of the present invention. - Note that the
valves method 60 differ from the valves in the previously describedmethods valves valves - In FIG. 4, the
packer 34b has been set within thewellbore 12b, and thevalve 40b has been closed. The remainder of thevalves formation portion 26b to the interior of thetubing string 28b is restricted. It may now be clearly seen that it is not necessary to set more than one of thepackers - Referring additionally now to FIG. 5, another
method 70 embodying principles of the present invention is schematically and representatively illustrated. In FIG. 5, elements which are similar to those previously described are indicated using the same reference numbers, with an added suffix "c". - The
method 70 is substantially similar to themethod 60 described above, except that no intervention into the well is used to selectively set or unset thepackers valves pump 62c andcontrol module 66c are operated by areceiver 72 interconnected in the tubing string 28c. Power for operation of thereceiver 72,pump 62c andcontrol module 66c is supplied by abattery 74 also interconnected in thetubing string 28c. Of course, other types of power sources may be utilized in place of thebattery 74. For example, the power source may be an electro-hydraulic generator, wherein fluid flow is utilized to generate electrical power, etc. - The
receiver 72 may be any of a variety of receivers capable of operatively receiving signals transmitted from a remote location. The signals may be in the form of acoustic telemetry, radio waves, mud pulses, electromagnetic waves, or any other form of data transmission. - The
receiver 72 is connected to thepump 62c, so that when an appropriate signal is received by the receiver, the pump is operated to provide fluid pressure to thecontrol module 66c. Thereceiver 72 is also connected to thecontrol module 66c, so that when another appropriate signal is received by the receiver, the control module is operated to direct the fluid pressure via thelines 64c to a selected one of thepackers valves receiver 72,battery 74,pump 62c andcontrol module 66c may be referred to as acommon actuator 76 for the sealing devices and flow control devices of thetubing string 28c. - As shown in FIG. 5, the
receiver 72 has received a signal to operate thepump 62c, and has received a signal for thecontrol module 66c to direct the fluid pressure to thepacker 30c. Thepacker 30c has, thus, been inflated and is preventing fluid flow longitudinally through thewellbore 12c between theformation portions - Referring additionally now to FIG. 6, another
method 80 embodying principles of the present invention is schematically and representatively illustrated. Elements of themethod 80 which are similar to those previously described are indicated in FIG. 6 with the same reference numbers, with an added suffix "d". - The
method 80 is similar to the previously describedmethod 70. However, instead of acommon actuator 76 utilized for selectively actuating the sealing devices and flow control devices, themethod 80 utilizes aseparate actuator packers valves actuators packers valves - Each of the
actuators receiver 72d,battery 74d,pump 62d andcontrol module 66d. Since each actuator 82, 84, 86 is directly connected to its corresponding pair of thepackers valves lines 64c, see FIG. 6) are used to interconnect thecontrol modules 66d to their respective packers and valves. However, lines could be provided if it were desired to space one or more of theactuators - In FIG. 6, the
receiver 72d of theactuator 84 has received a signal to operate itspump 62d, and a signal for itscontrol module 66d to direct the fluid pressure developed by the pump to thepacker 32d, and then to direct the fluid pressure to thevalve 38d. Thepacker 32d is, thus sealingly engaging thewellbore 12d between theformation portions receiver 72d of theactuator 86 has received a signal to operate itspump 62d, and a signal for itscontrol module 66d to direct the fluid pressure to thepacker 34d. Therefore, thepacker 34d is sealingly engaging thewellbore 12d between theformation portions formation portion 24d to the interior of thetubing string 28d. - Referring additionally now to FIG. 7, another
method 90 embodying principles of the present invention is schematically and representatively illustrated. Elements shown in FIG. 7 which are similar to those previously described are indicated using the same reference numbers, with an added suffix "e". - The
method 90 is similar to themethod 70 shown in FIG. 5, in that asingle actuator 92 is utilized to selectively actuate thepackers valves actuator 92 relies only indirectly on abattery 94 for operation of itsfluid pump 96, thus greatly extending the useful life of the battery. Areceiver 98 andcontrol module 100 of theactuator 92 are connected to thebattery 94 for operation thereof. - The
pump 96 is connected via ashaft 102 to animpeller 104 disposed within afluid passage 106 formed internally in theactuator 92. Asolenoid valve 108 is interconnected to thefluid passage 106 and serves to selectively permit and prevent fluid flow from thewellbore 12e into anatmospheric gas chamber 110 of the actuator through the fluid passage. Thus, when thevalve 108 is opened, fluid flowing from thewellbore 12e through thefluid passage 106 into thechamber 110 causes theimpeller 104 andshaft 102 to rotate, thereby operating thepump 96. When thevalve 108 is closed, thepump 96 ceases to operate. - The
valve 108 andcontrol module 100 are operated in response to signals received by thereceiver 98. As shown in FIG. 7, thereceiver 98 has received a signal to operate thepump 96, and thevalve 108 has been opened accordingly. Thereceiver 98 has also received a signal to operate thecontrol module 100 to direct fluid pressure developed by thepump 96 via thelines 64e to thepacker 32e and then to thevalve 36e. In this manner, thepacker 32e has been inflated to sealingly engage thewellbore 12e and thevalve 36e has been closed. Thus, it may be readily appreciated that fluid flow frommultiple formation portions tubing string 28e has been substantially restricted, even though only one of thepackers - Of course, many other types of actuators may be used in place of the
actuator 92 shown in FIG. 7. Theactuator 92 has been described only as an example of the variety of actuators that may be utilized for operation of thepackers valves actuator 92. Additionally, theactuator 92 may be modified extensively without departing from the principles of the present invention. For example, thebattery 94 andreceiver 98 may be eliminated by running acontrol line 112 from a remote location, such as the earth's surface or another location in the well, to theactuator 92. Thecontrol line 112 may be connected to thevalve 108 andcontrol module 100 for transmitting signals thereto, supplying electrical power, etc. Furthermore, thechamber 110,impeller 104 andvalve 108 may be eliminated by delivering power directly from thecontrol line 112 to thepump 100 for operation thereof. - Referring additionally now to FIG. 8, another
method 120 embodying principles of the present invention is schematically and representatively illustrated. In FIG. 8, elements which are similar to those previously described are indicated using the same reference numbers, with an added suffix "f". - In the
method 120, eachpacker valve corresponding control module 122 connected thereto. Thecontrol modules 122 are of the type utilized to direct fluid pressure fromlines 124 extending to a remote location to actuate equipment to which the control modules are connected. For example, thecontrol modules 122 may be SCRAMS modules available from Petroleum Engineering Services of The Woodlands, Texas, and/or as described in U.S. Patent No. 5,547,029. Accordingly, thelines 124 also carry electrical power and transmit signals to thecontrol modules 122 for selective operation thereof. For example, thelines 124 may transmit a signal to thecontrol module 122 connected to the packer 30f, causing the control module to direct fluid pressure from the lines to the packer 30f, thereby inflating the packer 30f. Alternatively, one control module may be connected to more than one of thepackers valves - Referring additionally now to FIG. 9, an
actuator 126 embodying principles of the present invention is representatively illustrated. Theactuator 126 may be used to actuate any of the tools described above, such aspackers valves actuator 126 may be utilized where it is desired to have an individual actuator actuate a corresponding individual tool, such as in themethod 80 described above. - The
actuator 126 includes a generally tubularouter housing 128, a generally tubularinner mandrel 130 andcircumferential seals 132. Theseals 132 sealingly engage both theouter housing 128 and the inner mandrel, and divide the annular space therebetween into threeannular chambers chambers chamber 136 viaopenings 140 formed through thehousing 128. - It will be readily appreciated by one skilled in the art that, with hydrostatic pressure greater than atmospheric pressure in
chamber 136 and surrounding the exterior of theactuator 126, theouter housing 128 will be biased downwardly relative to themandrel 130. Such biasing force may be utilized to actuate a tool, for example, a packer, valve or choke, connected to theactuator 126. For example, a mandrel of a conventional packer which is set by applying a downwardly directed force to the packer mandrel may be connected to thehousing 128 so that, when the housing is downwardly displaced relative to theinner mandrel 130 by the downwardly biasing force, the packer will be set. Similarly, theactuator 126 may be connected to a valve, for example, to displace a sleeve or other closure element of the valve, and thereby open or close the valve. Note that either thehousing 128 or themandrel 130, or both of them, may be interconnected in a tubular string for conveying theactuator 126 in the well, and either the housing or the mandrel, or both of them, may be attached to the tool for actuation thereof. Of course, theactuator 126 may be otherwise conveyed, for example, by slickline, etc., without departing from the principles of the present invention. - Referring additionally now to FIGS. 10 and 11,
devices housing 128 andmandrel 130 for relative displacement therebetween are representatively illustrated. Each of thedevices actuator 126 to be lowered into a well with increasing hydrostatic pressure, without thehousing 128 displacing relative to themandrel 130, until the device is triggered, at which time the housing and mandrel are released for displacement relative to one another. - In FIG. 10, it may be seen that an
annular recess 146 is formed internally on thehousing 128. A tumbler or stopmember 148 extends outward through anopening 150 formed in themandrel 130 and into therecess 146. In this position, thetumbler 148 prevents downward displacement of thehousing 128 relative to themandrel 130. Thetumbler 148 is maintained in this position by aretainer member 152. - A detent pin or lug 154 engages an
external shoulder 156 formed on themandrel 130 and prevents displacement of theretainer 152 relative to thetumbler 148. An outer release sleeve or blockingmember 158 prevents disengagement of thedetent pin 154 from theshoulder 156. Asolenoid 160 permits therelease sleeve 158 to be displaced, so that thedetent pin 154 is released, the retainer is permitted to displace relative to thetumbler 148, and the tumbler is permitted to disengage from therecess 146, thereby releasing thehousing 128 for displacement relative to themandrel 130. - The
solenoid 160 is activated to displace therelease sleeve 158 in response to a signal received by a receiver, such asreceivers lines 162 may be interconnected to a receiver and battery as described above for theactuator 76 in themethods actuator 92 in themethod 90. Alternatively, electrical power may be supplied to thelines 162 via a wet connect head, such as thewet connect head 68 in themethod 60. - In FIG. 11, it may be seen that the
recess 146 is engaged by apiston 164 extending outwardly from a fluid-filledchamber 166 formed in themandrel 130. Fluid in thechamber 166 prevents thepiston 164 from displacing inwardly out of engagement with therecess 146. Avalve 168 selectively permits fluid to be vented from thechamber 166, thereby permitting thepiston 164 to disengage from the recess, and permitting thehousing 128 to displace relative to themandrel 130. - The
valve 168 may be a solenoid valve or other type of valve which permits fluid to flow therethrough in response to an electrical signal onlines 170. Thus, thevalve 168 may be interconnected to a receiver and/or battery in a manner similar to thesolenoid 160 described above. Thevalve 168 may be remotely actuated by transmission of a signal to a receiver connected thereto, or the valve may be directly actuated by coupling an electrical power source to thelines 170. Of course, other manners of venting fluid from thechamber 166 may be utilized without departing from the principles of the present invention. - Referring additionally now to FIG. 12, another
actuator 172 embodying principles of the present invention is representatively illustrated. Theactuator 172 includes a generally tubularouter housing 174 and a generally tubularinner mandrel 176.Circumferential seals 178 sealingly engage thehousing 174 andmandrel 176, isolatingannular chambers -
Chamber 180 is substantially filled with a fluid, such as oil. Avalve 186, similar tovalve 168 described above, permits the fluid. to be selectively vented from thechamber 180 to the exterior of theactuator 172. When thevalve 186 is closed, thehousing 174 is prevented from displacing downward relative to themandrel 176. However, when thevalve 186 is opened, such as by using any of the methods described above for opening thevalve 168, the fluid is permitted to flow out of thechamber 180 and thehousing 174 is permitted to displace downwardly relative to themandrel 176. - The
housing 174 is biased downwardly due to a difference in pressure between thechambers chamber 182 is exposed to hydrostatic pressure via anopening 188 formed through thehousing 174. Thechamber 184 contains a gas, such as air or nitrogen at atmospheric or another relatively low pressure. Thus, when thevalve 186 is opened, hydrostatic pressure in thechamber 182 displaces thehousing 174 downward relative to themandrel 176, with the fluid in thechamber 180 being vented to the exterior of theactuator 172. - Referring additionally now to FIG. 13, another actuator190 embodying principles of the present invention is representatively illustrated. The
actuator 190 is similar in many respects to the previously describedactuator 172. However, theactuator 190 has additional chambers for increasing its force output, and includes a combined valve and choke 196 for regulating the rate at which itshousing 192 displaces relative to itsmandrel 194. - The valve and choke 196 may be a combination of a solenoid valve, such as
valves lines 198 connected thereto. -
Annular chambers housing 192 and themandrel 194. Thechambers circumferential seals 210. Thechambers 202, 206 are exposed to hydrostatic pressure viaopenings 212 formed through thehousing 192. Thechambers actuator 190 in a given annular space. - A fluid, such as oil, is contained in the
chamber 208. The valve/choke 196 regulates venting of the fluid from thechamber 208 to the exterior of theactuator 190. When the valve/choke 196 is opened, the fluid in thechamber 208 is permitted to escape therefrom, thereby permitting thehousing 192 to displace relative to themandrel 194. A larger or smaller orifice may be selected to correspondingly increase or decrease the rate at which thehousing 192 displaces relative to themandrel 194 when the fluid is vented from thechamber 208, or the electrical signal on thelines 198 may be adjusted to correspondingly vary the rate of fluid flow through the valve/choke 196 if it includes a variable choke. - Referring additionally now to FIG. 14, another
actuator 214 embodying principles of the present invention is representatively illustrated. Theactuator 214 is similar in many respects to theactuator 172 described above. However, theactuator 214 utilizes an increased piston area associated with itsannular gas chamber 216 in order to increase the force output by the actuator. - The
actuator 214 includes thechamber 216 andannular chambers tubular housing 222 and an inner generallytubular mandrel 224.Circumferential seals 226 sealingly engage themandrel 224 and thehousing 222. Thechamber 216 contains gas, such as air or nitrogen, at atmospheric or another relatively low pressure, thechamber 218 is exposed to hydrostatic pressure via anopening 228 formed through thehousing 222, and thechamber 220 contains a fluid, such as oil. - A
valve 230 selectively permits venting of the fluid in thechamber 220 to the exterior of theactuator 214. Thehousing 222 is prevented by the fluid in thechamber 220 from displacing relative to themandrel 224. When thevalve 230 is opened, for example, by applying an appropriate electrical signal tolines 231, the fluid in thechamber 220 is vented, thereby permitting thehousing 222 to displace relative to themandrel 224. - Note that each of the
actuators actuators valves actuators methods - Referring additionally now to FIG. 15, a
container 232 embodying principles of the present invention is representatively illustrated. Thecontainer 232 may be utilized to store a gas at atmospheric or another relatively low pressure downhole. In an embodiment described below, thecontainer 232 is utilized in the actuation of one or more tools or items of equipment downhole. - The
container 232 includes a generally tubularinner housing 234 and a generally tubularouter housing 236. Anannular chamber 238 is formed between the inner andouter housings annular chamber 238 contains a gas, such as air or nitrogen, at atmospheric or another relatively low pressure. - It will be readily appreciated by one skilled in the art that, in a well, hydrostatic pressure will tend to collapse the
outer housing 236 and burst theinner housing 234, due to the differential between the pressure in theannular chamber 238 and the pressure external to the container 232 (within theinner housing 234 and outside the outer housing 236). For this reason, thecontainer 232 includes a series of circumferentially spaced apart and longitudinally extending ribs orrods 240. Preferably, theribs 240 are spaced equidistant from each other, but that is not necessary, as shown in FIG. 15. - The
ribs 240 significantly increase the ability of theouter housing 236 to resist collapse due to pressure applied externally thereto. Theribs 240 contact both theouter housing 236 and theinner housing 234, so that radially inwardly directed displacement of theouter housing 236 is resisted by theinner housing 234. Thus, thecontainer 232 is well suited for use in high pressure downhole environments. - Referring additionally now to FIG. 16, an
apparatus 242 embodying principles of the present invention is representatively illustrated. Theapparatus 242 demonstrates use of thecontainer 232 along with afluid power source 244, such as any of the pumps and/or actuators described above which are capable of producing an elevated fluid pressure, to control actuation of atool 246. - The
tool 246 is representatively illustrated as including a generally tubularouter housing 248 sealingly engaged and reciprocably disposed relative to a generally tubularinner mandrel 250.Annular chambers housing 248 andmandrel 250. Fluid pressure in thechamber 252 greater than fluid pressure in thechamber 254 will displace thehousing 248 to the left relative to themandrel 250 as viewed in FIG. 16, and fluid pressure in thechamber 254 greater than fluid pressure in thechamber 252 will displace thehousing 248 to the right relative to themandrel 250 as viewed in FIG. 16. Of course, either or both of thehousing 248 andmandrel 250 may displace in actual practice. It is to be clearly understood that thetool 246 is merely representative of tools, such as packers, valves, chokes, etc., which may be operated by fluid pressure applied thereto. - When it is desired to displace the
housing 248 and/ormandrel 250, one of thechambers container 232, and the other chamber is opened to thefluid power source 244. For example, to displace thehousing 248 to the right relative to themandrel 250 as viewed in FIG. 16, avalve 256 between thefluid power source 244 and thechamber 254 is opened, and avalve 258 between thecontainer 232 and thechamber 252 is opened. The resulting pressure differential between thechambers housing 248 to displace to the right relative to themandrel 250. To displace thehousing 248 to the left relative to themandrel 250 as viewed in FIG. 16, avalve 260 between thefluid power source 244 and thechamber 252 is opened, and avalve 262 between thecontainer 232 and thechamber 254 is opened. Thevalves housing 248 is displaced to the right relative to the mandrel, and thevalves tool 246 may, thus, be repeatedly actuated by alternately connecting each of thechambers fluid power source 244 and thecontainer 232. - The
valves valves - The
tool 246 may be used to actuate another tool, without departing from the principles of the present invention. For example, themandrel 250 may be attached to a packer mandrel, so that when themandrel 250 is displaced in one direction relative to thehousing 248, the packer is set, and when themandrel 250 is displaced in the other direction relative to thehousing 248, the packer is unset. For this purpose, thehousing 248 ormandrel 250 may be interconnected in a tubular string for conveyance within a well. - Note that the
fluid power source 244 may alternatively be another source of fluid at a pressure greater than that of the gas or other fluid in thecontainer 232, without the pressure of the delivered fluid being elevated substantially above hydrostatic pressure in the well. For example,element 244 shown in FIG. 16 may be a source of fluid at hydrostatic pressure. Thefluid source 244 may be the well annulus surrounding theapparatus 242 when it is disposed in the well; it may be the interior of a tubular string to which the apparatus is attached; it may originate in a chamber conveyed into the well with, or separate from, the apparatus; if conveyed into the well in a chamber, the chamber may be a collapsible or elastic bag, or the chamber may include an equalizing piston separating clean fluid for delivery to thetool 246 from fluid in the well; the fluid source may include fluid processing features, such as a fluid filter, etc. Thus, it will be readily appreciated that it is not necessary for thefluid source 244 to deliver fluid to thetool 246 at a pressure having any particular relationship to hydrostatic pressure in the well, although the fluid source may deliver fluid at greater than, less than and/or equal to hydrostatic pressure. - Referring additionally to FIG. 17, another
apparatus 264 utilizing thecontainer 232 and embodying principles of the present invention is representatively illustrated. Theapparatus 264 includesmultiple tools outer housings inner mandrels annular chambers tools apparatus 264. Alternatively, displacement of each of thehousings mandrels apparatus 264 including thecontainer 232 and thetool 266 may be interconnected in a tubular string, with thetool 266 attached to a packer mandrel, such that when thehousing 272 is displaced relative to themandrel 278, the packer is set. -
Valves chambers chamber 238 of thecontainer 232. Each of thechambers apparatus 264 is lowered within a well, hydrostatic pressure in the well acts to pressurize the fluid in thechambers housings corresponding mandrel - To actuate one of the
tools valve corresponding chamber chamber 238 of thecontainer 232. As described above, thechamber 238 is substantially filled with a gas, such as air or nitrogen at atmospheric or another relatively low pressure. Hydrostatic pressure in the well will displace thecorresponding housing corresponding mandrel corresponding chamber corresponding valve container 232. Such displacement may be readily stopped by closing thecorresponding valve - Operation of the
valves valves valves - The
valve 290 may be a solenoid valve. Thevalve 292 may be a fusible plug-type valve (a valve openable by dissipation of a plug blocking fluid flow through a passage therein), such as that available from BEI. Thevalve 294 may be a valve/choke, such as the valve/choke 196 described above. Thus, it may be clearly seen that any type of valve may be used for each of thevalves - Referring additionally now to FIG. 18, another
apparatus 296 embodying principles of the present invention is representatively illustrated. Theapparatus 296 includes thereceiver 72,battery 74 and pump 62 described above, combined in an individual actuator orhydraulic power source 298 connected via a fluid conduit orline 300 to a tool or item ofequipment 302, such as a packer, valve, choke, or other flow control device. Theline 300 may be internally or externally provided, and theactuator 298 may be constructed with thetool 302, with no separation therebetween. - In FIG. 18, the
apparatus 296 is depicted interconnected as a part of atubular string 304 installed in a well. To operate thetool 302, a signal is transmitted from a remote location, such as the earth's surface or another location within the well, to thereceiver 72. In response, thepump 62 is supplied electrical power from thebattery 74, so that fluid at an elevated pressure is transmitted via theline 300 to thetool 302, for example, to set or unset a hydraulic packer, open or close a valve, vary a choke flow restriction, etc. Note that the representatively illustratedtool 302 is of the type which is responsive to fluid pressure applied thereto. - Referring additionally now to FIG. 19, an
apparatus 306 embodying principles of the present invention is representatively illustrated. Theapparatus 306 is similar in many respects to theapparatus 296 described above, however, atool 308 of theapparatus 306 is of the type responsive to force applied thereto, such as a packer set by applying an axial force to a mandrel thereof, or a valve opened or closed by displacing a sleeve or other blocking member therein. - To operate the
tool 308, a signal is transmitted from a remote location, such as the earth's surface or another location within the well, to thereceiver 72. In response, thepump 62 is supplied electrical power from thebattery 74, so that fluid at an elevated pressure is transmitted via theline 300 to ahydraulic cylinder 310 interconnected between thetool 308 and theactuator 298. Thecylinder 310 includes apiston 312 therein which displaces in response to fluid pressure in theline 300. Such displacement of thepiston 312 operates thetool 308, for example, displacing a mandrel of a packer, opening or closing a valve, varying a choke flow restriction, etc. - Thus have been described the
methods actuators valves
Claims (10)
- A method of controlling actuation of a tool within a subterranean wellbore, comprising the steps of: positioning a tubular string within the wellbore, the tubular string including the tool, a pump, an electrical power source, and a receiver; transmitting a signal to the receiver, thereby causing the pump to be powered by the power source, the pump delivering pressurized fluid; and actuating the tool in response to the delivery of pressurized fluid by the pump.
- A method according to Claim 1, wherein the pump, receiver and power source are combined in an actuator.
- A method according to Claim 2, wherein the actuator is attached to the tool via a line extending therebetween.
- A method according to Claim 2, wherein the actuator is combined with the tool.
- A method according to Claim 1, wherein a piston is interconnected between the pump and the tool.
- Apparatus operatively positionable within a subterranean well, comprising: an actuator including a receiver, a pump and an electrical power source, the receiver being operable to couple the pump to the power source for operation of the pump in response to a remotely transmitted signal; a well tool; and a fluid conduit interconnecting the pump and the tool.
- Apparatus according to Claim 6, wherein the actuator and well tool are interconnected in a tubular string positionable within the well.
- Apparatus according to Claim 6 or 7, further comprising a piston, the piston displacing and operating the tool in response to operation of the pump.
- A remotely controllable well control system comprising: a tubular string disposed in the well, the tubular string including at least one well tool and at least one actuator, the actuator including a receiver, and the actuator being operable to actuate the well tool in response to a signal transmitted to the receiver from a remote location.
- A system according to Claim 9, wherein the actuator further includes an electrical power source, the power source supplying electrical power to a component of the actuator when the signal is received by the receiver.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18452698A | 1998-11-02 | 1998-11-02 | |
US184526 | 1998-11-02 |
Publications (2)
Publication Number | Publication Date |
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EP0999342A2 true EP0999342A2 (en) | 2000-05-10 |
EP0999342A3 EP0999342A3 (en) | 2002-12-04 |
Family
ID=22677267
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99308564A Withdrawn EP0999342A3 (en) | 1998-11-02 | 1999-10-28 | Method and apparatus for controlling actuation of a tool within a subterranean wellbore |
Country Status (2)
Country | Link |
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EP (1) | EP0999342A3 (en) |
AU (1) | AU5601999A (en) |
Cited By (2)
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US8479810B2 (en) | 2007-06-26 | 2013-07-09 | Paul David Metcalfe | Downhole apparatus |
US9353606B2 (en) | 2010-11-16 | 2016-05-31 | Darcy Technologies Limited | Downhole method and apparatus |
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1999
- 1999-10-22 AU AU56019/99A patent/AU5601999A/en not_active Abandoned
- 1999-10-28 EP EP99308564A patent/EP0999342A3/en not_active Withdrawn
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EP0500341A1 (en) * | 1991-02-20 | 1992-08-26 | Halliburton Company | Downhole tool apparatus actuatable by pressure differential |
EP0697500A2 (en) * | 1994-08-15 | 1996-02-21 | Halliburton Company | Method and apparatus for the evaluation of formation pressure |
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US8479810B2 (en) | 2007-06-26 | 2013-07-09 | Paul David Metcalfe | Downhole apparatus |
US8555985B2 (en) | 2007-06-26 | 2013-10-15 | Paul David Metcalfe | Permeability modification |
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Also Published As
Publication number | Publication date |
---|---|
EP0999342A3 (en) | 2002-12-04 |
AU5601999A (en) | 2000-05-04 |
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