US20120067567A1 - Downhole completion system with retrievable power unit - Google Patents
Downhole completion system with retrievable power unit Download PDFInfo
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- US20120067567A1 US20120067567A1 US13/233,206 US201113233206A US2012067567A1 US 20120067567 A1 US20120067567 A1 US 20120067567A1 US 201113233206 A US201113233206 A US 201113233206A US 2012067567 A1 US2012067567 A1 US 2012067567A1
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- 230000008569 process Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0085—Adaptations of electric power generating means for use in boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
Definitions
- Hydrocarbon fluids e.g. oil and natural gas
- Hydrocarbon fluids are obtained from a subterranean geologic formation, referred to as a reservoir, by drilling a well that penetrates the hydrocarbon-bearing formation.
- a wellbore Once a wellbore is drilled, various forms of well completion components may be installed to control and enhance the efficiency of producing fluids from the reservoir.
- many downhole components e.g. sensors and electrically actuated valves, require power to function properly.
- downhole power generation devices For example, permanent magnet generators have been combined with turbines and located downhole in a wellbore. However, if constant power generation is required from the generator, the wellbore section containing the power generation device must remain open to provide continuous flow through the turbine. In some applications, the downhole power generation devices have been used to generate power for driving a hydraulic pump which, in turn, hydraulically actuates flow control valves. However, such systems have limited use for powering downhole electrical components. Additionally, retrieval and servicing of existing power generation devices tends to be a complex and time-consuming process.
- the present disclosure provides a technique for supplying a downhole completion with electrical power.
- the technique comprises placing an independent completion in a wellbore section.
- the independent completion is provided with a removable power unit having a hydraulically driven power generator coupled to a power storage device.
- the technique further comprises communicating data or other signals between the independent completion located in the wellbore section and a second completion located in a separate wellbore section.
- FIG. 1 is a schematic illustration of a well system deployed in a wellbore and including an independent completion with a removable power unit positioned in a wellbore section and another completion deployed in a different wellbore section, according to an embodiment of the present disclosure
- FIG. 2 is a schematic illustration similar to the illustration in FIG. 1 but showing a plurality of independent completions deployed in lateral wellbores and communicating with a completion deployed in a primary or vertical wellbore section, according to an embodiment of the present disclosure
- FIG. 3 is an illustration of an example of an independent completion comprising a power unit with a power generator and a power storage device deployed in a wellbore, according to an embodiment of the present disclosure.
- an independent completion is deployed in a wellbore section, such as a lateral wellbore section or other desired wellbore section.
- the independent completion comprises a removable power unit having a power generator and a power storage coupled to the power generator.
- the well system also may comprise a telemetry system for communicating data between the independent completion and another completion located in a different wellbore section.
- the telemetry system may comprise a wireless telemetry system, such as an electromagnetic wireless telemetry system or a pressure pulse telemetry system.
- the independent completion comprises a turbine power generator which provides power for monitoring and controlling well fluid production within a wellbore section.
- the independent completion may be a fully self-sustained system so that no hard wire is required between the wellbore section, e.g. a lateral wellbore section, and a second completion located in a second wellbore section, e.g. in a motherbore.
- Communication signals may be passed between the independent completion and the second completion via the wireless telemetry system. Additionally, the communication signals may be relayed between the second completion and a control system located at the surface.
- Power generated by the turbine power generator within the wellbore section may be stored in a suitable power storage device.
- the power storage device may comprise one or more batteries, e.g. rechargeable batteries, which directly power electrical devices in the independent completion.
- the electrical power may be used to power electric flow control valves and/or sensors located within the wellbore section. As the batteries become depleted, further production fluid spins the turbine of the turbine power generator to generate power for recharging batteries, thus increasing the life of the downhole independent completion system.
- the entire power unit comprising the power generator and the power storage device may be removable and retrievable to the surface.
- the power unit may be coupled to the remainder of the independent completion by a suitable coupling, such as an inductive coupling, to enable retrieval and servicing of the power unit. After servicing, the power unit can be re-deployed and reengaged with the remainder of the independent completion in the wellbore section (e.g. a lateral wellbore section or a portion of a vertical wellbore) for extended use during another service lifetime.
- a suitable coupling such as an inductive coupling
- the independent completion comprises an intelligent completion system which may be deployed in the downhole lateral wellbore section and used to power, for example, electric flow control valves.
- the independent completion may comprise numerous flow control valves which are used in cooperation with one or more production packers to isolate a plurality of production well zones.
- the multiple electric flow control valves can be controlled via electric power provided by the power unit of the independent completion.
- the ability to intelligently control each production well zone along the lateral wellbore section can substantially enhance hydrocarbon recovery.
- the wireless telemetry system is used to eliminate the challenges associated with routing a cable through a lateral window and with forming cable connections downhole. In other applications, however, the independent completion may be used in a non-lateral, e.g.
- downhole power generation can be used for re-completing vertical wells which have no existing electrical feed through the wellhead.
- Downhole power generation combined with a wireless telemetry system enables monitoring and control without incurring the cost and inconvenience of replacing the wellhead and tubing hanger.
- a well system 20 is illustrated as deployed in a well 22 having a wellbore section 24 and at least one additional wellbore section 26 , such as a generally vertical wellbore section.
- wellbore section 24 may be a lateral wellbore section or a vertical wellbore section.
- the wellbore section 26 is a generally vertical wellbore section which may comprise a motherbore from which one or more lateral wellbore sections 24 extend.
- a well completion 28 is deployed in the wellbore section 26
- an independent completion 30 is deployed in the wellbore section 24 , e.g. in a lateral wellbore section.
- the independent completion 30 is a fully self-sustained system with no hard wire connection to the well completion 28 .
- the well completion 28 may comprise a variety of components and systems 32 to facilitate, for example, production and/or injection of fluids.
- One or more packers 34 may be employed to segregate well zones 36 along wellbore section 26 .
- independent completion 30 may comprise a variety of components and systems to facilitate the flow of production fluid and/or injection fluids with respect to one or more well zones 38 located along lateral wellbore section 24 .
- independent completion 30 comprises at least one tubing or housing section 40 and one or more packers 42 surrounding tubing section 40 to isolate the desired well zone(s) 38 along lateral wellbore section 24 .
- the independent completion 30 also comprises a power unit 44 which is removably engaged with the remainder of independent completion 30 , e.g. with tubing section 40 .
- the power unit 40 comprises a power generator 46 and a power storage device 48 operatively coupled with the power generator 46 .
- the power generator 46 may be a hydraulically driven generator, such as a turbine generator, which is rotated by fluid flow along independent completion 30 .
- the flow of production fluid into lateral wellbore 24 from one or more well zones 38 of the surrounding formation 50 may be used to drive the turbine or other type of hydraulically driven power generator 46 .
- the resulting electrical power can be used to charge power storage device 48 and/or to directly power a variety of electrical devices 52 positioned in independent completion 30 or at other locations along the lateral wellbore section 24 or at other suitable downhole locations.
- the power storage device 48 may be in the form of a battery, e.g. a rechargeable battery, which can be charged by the power/current output from power generator 46 . This allows the power storage device 48 to provide power for electrical devices 52 even when lateral wellbore section 24 is shut-in or during other periods when no fluid flows through power generator 46 .
- Electrical devices 52 may comprise a wide variety of electrically powered devices, and the specific types of devices 52 depend on the design of independent completion 30 as well as on operational and/or environmental considerations.
- the power unit 44 may be used to provide power for a single electrical device 52 or for multiple electrical devices 52 .
- electrical devices 52 may comprise one or more flow control valves 54 and one or more sensors 56 .
- the electric flow control valves 54 and the sensors 56 may be placed in the well zones 38 along lateral wellbore section 24 .
- Power may be provided to electrical devices 52 and/or data signals may be output from sensors 56 or other electrical devices 52 through suitable conductors 58 .
- a suitable coupling mechanism 60 is employed to enable selective engagement of the power unit 44 while also enabling transfer of signals to or from conductors 58 .
- the coupling mechanism 60 may comprise an inductive coupler.
- the wireless telemetry system 62 may be used to convey control signals from well completion 28 to independent completion 30 and its electrical devices 52 .
- signals may be transmitted downhole from a surface control system 64 to a first transceiver 66 of the wireless telemetry system 62 and those signals are transmitted wirelessly to a second transceiver 68 of wireless telemetry system 62 located on independent completion 30 .
- the wireless telemetry system 62 may be used to transmit sensor data and other data wirelessly from independent completion 30 to well completion 28 for relay uphole to surface control system 64 .
- the wellbore section 24 also may be a vertical wellbore section capable of receiving independent completion 30 .
- downhole power generation may be employed in a vertical wellbore and wireless communication can be established through a tubing hanger located below a tree. This approach can be used in, for example, a re-completion in which the existing wellhead and tubing hanger do not have an electrical feed through. The downhole power can be used even though there is no electrical hardware through the existing surface or subsea wellheads.
- the wellbore section 26 is a generally vertical wellbore from which a plurality of the lateral wellbores 24 extend.
- an independent completion 30 is deployed in each of the illustrated lateral wellbore sections 24 .
- the independent completions 30 are each fully self-sustained systems which independently communicate with well completion 28 in vertical wellbore 26 via wireless telemetry system 62 .
- the overall system enables independent flow control and/or other control functions in each lateral wellbore section 24 without requiring connecting equipment or electrical cables between the independent completions 30 and the well completion 28 .
- each independent completion 30 comprises removable and retrievable power unit 44 .
- each power unit 30 comprises the power generator 46 coupled with the corresponding power storage device 48 . This enables electrical power to be supplied to electrical devices 52 , e.g. flow control valves 54 and sensors 56 , via the power generator 46 and/or the power storage device 48 .
- the wireless telemetry system 62 may be designed to independently handle transmission of data signals from each of the independent completions 30 and to transmit control signals to specific independent completions 30 so as to control fluid flow and/or other functions within each lateral wellbore section 24 .
- the power unit 44 may be retrieved when necessary to recharge the power storage device 48 , to service the power unit 44 , or to replace the power unit 44 with a new or different power unit.
- the power unit 44 may be coupled with an appropriate fishing tool or other retrieval tool and pulled to a surface location.
- the power unit 44 may be sized for retrieval up through an interior of the well completion 28 located in wellbore section 26 .
- the new or serviced power unit 44 is then simply conveyed downhole through the interior of well completion 28 and re-engaged with the remainder of the corresponding independent completion 30 residing in the corresponding wellbore section 24 , e.g. a corresponding lateral wellbore section or suitable non-lateral wellbore section.
- FIG. 3 a more detailed example of overall wellbore system 20 and of independent completion 30 is illustrated.
- the independent completion 30 as well as other components and systems of the overall well system 20 , may be adjusted with a variety of additional and/or alternate components and systems.
- the specific components and the arrangement of components and systems depends on the parameters of a given application and environment.
- the power unit 44 comprises power generator 46 in the form of a turbine generator 70 and further comprises power storage 48 in the form of a rechargeable battery 72 .
- the power unit 44 also includes coupling mechanism 60 in the form of an inductive coupler 74 .
- Turbine generator 70 and rechargeable battery 72 are electrically coupled to electrical devices 52 via inductive coupler 74 .
- electrical power signals and/or data signals may be transferred through inductive coupler 74 to or from electrical devices, such as electrical flow control valve 54 , sensors 56 , and a corresponding telemetry unit 76 which is used to transfer signals to or from electric flow control valve 54 and/or sensors 56 via conductors 58 in cooperation with inductive coupler 74 .
- the power unit 44 may be secured within an expanded housing portion 78 via a locking mechanism 80 disposed between power unit 44 and housing portion 78 .
- the electrical flow control valve 54 is powered by power unit 44 and actuated to selectively control the flow of fluid, e.g. production fluid, along lateral wellbore section 24 .
- the electrical flow control valve 54 may be selectively opened to enable flow of well fluid from the surrounding well zone 38 into independent completion 30 through appropriate inlet ports 82 .
- the well fluid then flows through the flow control valve 54 and along an interior of independent completion 30 , as represented by arrows 84 .
- the production fluid continues to flow through an interior of the inductive coupler 74 and is released into expanded housing portion 78 , as represented by arrows 86 .
- the production fluid flows along an exterior of rechargeable battery 72 within the expanded housing portion 78 until passing through turbine generator 70 .
- the flow of fluid through turbine generator 70 causes rotation of the turbine and generation of electrical power which is supplied to rechargeable battery 72 and/or to electrical devices 52 of independent completion 30 via conductors 58 .
- the produced well fluid continues to flow into vertical wellbore section 26 and up through well completion 28 for production to a desired surface location.
- the well completion 28 may comprise one or more electric submersible pumping systems designed to produce fluid to the surface location while drawing fluid into the lateral wellbore section 24 .
- FIG. 3 illustrates a single packer 42 , however additional packers 42 may be used to isolate additional well zones 38 along lateral wellbore section 24 .
- a variety of telemetry systems 62 may be employed to communicate signals between the independent completion 30 and the well completion 28 located in a different wellbore section.
- the telemetry system may comprise a wireless telemetry system, such as an acoustic telemetry system or an electromagnetic wireless telemetry system.
- telemetry system 62 may comprise an electromagnetic wireless telemetry system or an acoustic telemetry system.
- the downhole turbine generator 70 , battery 72 , inductive coupler 74 , and wireless telemetry system 62 may be used in cooperation to fully control and power the independent, intelligent completion 30 located in lateral wellbore section 24 .
- electrical signals are output and those electrical power signals may be rectified into a DC signal for charging the battery 72 .
- the battery 72 sends the correct amount of power to the flow control valve actuator or to the appropriate sensor through the inductive coupler 74 .
- Telemetry unit 76 may also be used to distribute the power from power unit 44 to all of the electrically powered completion components 52 .
- Feedback may be continuously sent to the surface via the wireless telemetry system 62 .
- the use of power storage device 48 and wireless telemetry system 62 enables operation of and control over the independent completion 30 even during a well shut-in when no production fluid flows.
- the localized power storage provided by power storage device 48 allows an operator to shut-in the well for a finite period of time while devices 52 are powered by the power storage device 48 . Even during shut-in, sensor readings regarding pressure build-up and/or other parameters may be obtained and other well testing can be conducted.
- the resulting data may be transmitted to the surface with the aid of wireless telemetry system 62 during the finite shut-in period.
- the entire power unit 44 may be removed by releasing the locking mechanism 80 .
- the power unit portion of the inductive coupler 74 is simply pulled or otherwise disengaged from the remainder of the independent completion 30 and retrieved to the surface.
- applying a pulling force to power unit 44 may be used to cause release of locking mechanism 80 and disengagement of inductive coupler 74 .
- the entire power unit 44 may be designed with a sufficiently small diameter or cross-section so that it may be pulled up through an interior of well completion 28 . Removal through the interior of the completion 28 obviates the need to remove any uphole hardware to perform the servicing or replacement operation.
- the power unit 44 may simply be re-deployed down through well completion 28 and locked into place within the independent completion 30 via locking mechanism 80 .
- the inductive coupler also is again connected to allow for electrical signals to be transmitted from and/or to electrical devices 52 .
- the components of power unit 44 , independent completion 30 , and overall well system 20 can be adjusted to accommodate a variety of structural, operational, and/or environmental parameters.
- various combinations of packers, flow control valves, telemetry systems, power generators, power storage devices, sensors and other components may be used to achieve the desired flow control or other downhole functional control.
- the number and arrangement of wellbore sections and well zones along each wellbore section may vary substantially from one well application to another. In some applications, wellbore sections are disposed along lateral wellbores while other applications have at least one wellbore section in a non-lateral, e.g. vertical, wellbore.
- the technique and mechanisms used to deploy and retrieve the power units also may change from one application to another.
Abstract
A technique facilitates providing a downhole completion with electrical power. The technique may comprise placing an independent completion in a wellbore section. The independent completion is provided with a removable power unit having a power generator coupled to a power storage device. The technique further comprises communicating data or other signals between the independent completion located in the wellbore section and a second completion located in a separate wellbore section.
Description
- The present document is based on and claims priority to U.S. Provisional Application Ser. No.: 61/385,229, filed Sep. 22, 2010, incorporated herein by reference.
- Hydrocarbon fluids, e.g. oil and natural gas, are obtained from a subterranean geologic formation, referred to as a reservoir, by drilling a well that penetrates the hydrocarbon-bearing formation. Once a wellbore is drilled, various forms of well completion components may be installed to control and enhance the efficiency of producing fluids from the reservoir. However, many downhole components, e.g. sensors and electrically actuated valves, require power to function properly.
- To provide power downhole, attempts have been made to utilize downhole power generation devices. For example, permanent magnet generators have been combined with turbines and located downhole in a wellbore. However, if constant power generation is required from the generator, the wellbore section containing the power generation device must remain open to provide continuous flow through the turbine. In some applications, the downhole power generation devices have been used to generate power for driving a hydraulic pump which, in turn, hydraulically actuates flow control valves. However, such systems have limited use for powering downhole electrical components. Additionally, retrieval and servicing of existing power generation devices tends to be a complex and time-consuming process.
- In general, the present disclosure provides a technique for supplying a downhole completion with electrical power. According to one embodiment, the technique comprises placing an independent completion in a wellbore section. The independent completion is provided with a removable power unit having a hydraulically driven power generator coupled to a power storage device. The technique further comprises communicating data or other signals between the independent completion located in the wellbore section and a second completion located in a separate wellbore section.
- Certain embodiments of the disclosure will hereafter be described with reference to the accompanying drawings, wherein like reference numerals denote like elements, and:
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FIG. 1 is a schematic illustration of a well system deployed in a wellbore and including an independent completion with a removable power unit positioned in a wellbore section and another completion deployed in a different wellbore section, according to an embodiment of the present disclosure; -
FIG. 2 is a schematic illustration similar to the illustration inFIG. 1 but showing a plurality of independent completions deployed in lateral wellbores and communicating with a completion deployed in a primary or vertical wellbore section, according to an embodiment of the present disclosure; and -
FIG. 3 is an illustration of an example of an independent completion comprising a power unit with a power generator and a power storage device deployed in a wellbore, according to an embodiment of the present disclosure. - In the following description, numerous details are set forth to provide an understanding of the present disclosure. However, it will be understood by those of ordinary skill in the art that the present disclosure may be practiced without these details and that numerous variations or modifications from the described embodiments may be possible.
- The disclosure herein generally relates to a system and methodology regarding well completion systems and more particularly to well completion systems having a retrievable downhole power generating unit. According to one embodiment, an independent completion is deployed in a wellbore section, such as a lateral wellbore section or other desired wellbore section. The independent completion comprises a removable power unit having a power generator and a power storage coupled to the power generator. The well system also may comprise a telemetry system for communicating data between the independent completion and another completion located in a different wellbore section. By way of example, the telemetry system may comprise a wireless telemetry system, such as an electromagnetic wireless telemetry system or a pressure pulse telemetry system.
- In some embodiments, the independent completion comprises a turbine power generator which provides power for monitoring and controlling well fluid production within a wellbore section. The independent completion may be a fully self-sustained system so that no hard wire is required between the wellbore section, e.g. a lateral wellbore section, and a second completion located in a second wellbore section, e.g. in a motherbore. Communication signals may be passed between the independent completion and the second completion via the wireless telemetry system. Additionally, the communication signals may be relayed between the second completion and a control system located at the surface.
- Power generated by the turbine power generator within the wellbore section may be stored in a suitable power storage device. By way of example, the power storage device may comprise one or more batteries, e.g. rechargeable batteries, which directly power electrical devices in the independent completion. For example, the electrical power may be used to power electric flow control valves and/or sensors located within the wellbore section. As the batteries become depleted, further production fluid spins the turbine of the turbine power generator to generate power for recharging batteries, thus increasing the life of the downhole independent completion system. Additionally, the entire power unit comprising the power generator and the power storage device may be removable and retrievable to the surface. The power unit may be coupled to the remainder of the independent completion by a suitable coupling, such as an inductive coupling, to enable retrieval and servicing of the power unit. After servicing, the power unit can be re-deployed and reengaged with the remainder of the independent completion in the wellbore section (e.g. a lateral wellbore section or a portion of a vertical wellbore) for extended use during another service lifetime.
- In some embodiments, the independent completion comprises an intelligent completion system which may be deployed in the downhole lateral wellbore section and used to power, for example, electric flow control valves. Within the lateral wellbore section, the independent completion may comprise numerous flow control valves which are used in cooperation with one or more production packers to isolate a plurality of production well zones. The multiple electric flow control valves can be controlled via electric power provided by the power unit of the independent completion. The ability to intelligently control each production well zone along the lateral wellbore section can substantially enhance hydrocarbon recovery. In some applications, the wireless telemetry system is used to eliminate the challenges associated with routing a cable through a lateral window and with forming cable connections downhole. In other applications, however, the independent completion may be used in a non-lateral, e.g. a vertical, wellbore. For example, downhole power generation can be used for re-completing vertical wells which have no existing electrical feed through the wellhead. Downhole power generation combined with a wireless telemetry system enables monitoring and control without incurring the cost and inconvenience of replacing the wellhead and tubing hanger.
- Referring generally to
FIG. 1 , an embodiment of awell system 20 is illustrated as deployed in a well 22 having awellbore section 24 and at least oneadditional wellbore section 26, such as a generally vertical wellbore section. Depending on the application,wellbore section 24 may be a lateral wellbore section or a vertical wellbore section. In the example illustrated, thewellbore section 26 is a generally vertical wellbore section which may comprise a motherbore from which one or more lateralwellbore sections 24 extend. In this embodiment, awell completion 28 is deployed in thewellbore section 26, and anindependent completion 30 is deployed in thewellbore section 24, e.g. in a lateral wellbore section. In at least some applications, theindependent completion 30 is a fully self-sustained system with no hard wire connection to thewell completion 28. - The
well completion 28 may comprise a variety of components andsystems 32 to facilitate, for example, production and/or injection of fluids. One ormore packers 34 may be employed to segregatewell zones 36 alongwellbore section 26. Similarly,independent completion 30 may comprise a variety of components and systems to facilitate the flow of production fluid and/or injection fluids with respect to one ormore well zones 38 located alonglateral wellbore section 24. - In the embodiment illustrated,
independent completion 30 comprises at least one tubing orhousing section 40 and one ormore packers 42 surroundingtubing section 40 to isolate the desired well zone(s) 38 alonglateral wellbore section 24. Theindependent completion 30 also comprises apower unit 44 which is removably engaged with the remainder ofindependent completion 30, e.g. withtubing section 40. By way of example, thepower unit 40 comprises apower generator 46 and apower storage device 48 operatively coupled with thepower generator 46. By way of further example, thepower generator 46 may be a hydraulically driven generator, such as a turbine generator, which is rotated by fluid flow alongindependent completion 30. For example, the flow of production fluid intolateral wellbore 24 from one or morewell zones 38 of the surroundingformation 50 may be used to drive the turbine or other type of hydraulically drivenpower generator 46. - The resulting electrical power can be used to charge
power storage device 48 and/or to directly power a variety ofelectrical devices 52 positioned inindependent completion 30 or at other locations along thelateral wellbore section 24 or at other suitable downhole locations. Thepower storage device 48 may be in the form of a battery, e.g. a rechargeable battery, which can be charged by the power/current output frompower generator 46. This allows thepower storage device 48 to provide power forelectrical devices 52 even whenlateral wellbore section 24 is shut-in or during other periods when no fluid flows throughpower generator 46. -
Electrical devices 52 may comprise a wide variety of electrically powered devices, and the specific types ofdevices 52 depend on the design ofindependent completion 30 as well as on operational and/or environmental considerations. Thepower unit 44 may be used to provide power for a singleelectrical device 52 or for multipleelectrical devices 52. By way of example,electrical devices 52 may comprise one or moreflow control valves 54 and one ormore sensors 56. The electricflow control valves 54 and thesensors 56 may be placed in thewell zones 38 alonglateral wellbore section 24. Power may be provided toelectrical devices 52 and/or data signals may be output fromsensors 56 or otherelectrical devices 52 throughsuitable conductors 58. Because thepower unit 44 may be selectively engaged and disengaged from the remainder ofindependent completion 30, asuitable coupling mechanism 60 is employed to enable selective engagement of thepower unit 44 while also enabling transfer of signals to or fromconductors 58. By way of example, thecoupling mechanism 60 may comprise an inductive coupler. - In some applications, no hard wired connections exist between
independent completion 30 andwell completion 28. In these applications, signals are transferred via awireless telemetry system 62. Thewireless telemetry system 62 may be used to convey control signals fromwell completion 28 toindependent completion 30 and itselectrical devices 52. For example, signals may be transmitted downhole from asurface control system 64 to afirst transceiver 66 of thewireless telemetry system 62 and those signals are transmitted wirelessly to asecond transceiver 68 ofwireless telemetry system 62 located onindependent completion 30. Similarly, thewireless telemetry system 62 may be used to transmit sensor data and other data wirelessly fromindependent completion 30 towell completion 28 for relay uphole to surfacecontrol system 64. Although theindependent completion 30 andwireless telemetry system 62 are amenable to use in lateral wellbores, thewellbore section 24 also may be a vertical wellbore section capable of receivingindependent completion 30. In some applications, for example, downhole power generation may be employed in a vertical wellbore and wireless communication can be established through a tubing hanger located below a tree. This approach can be used in, for example, a re-completion in which the existing wellhead and tubing hanger do not have an electrical feed through. The downhole power can be used even though there is no electrical hardware through the existing surface or subsea wellheads. - Referring generally to
FIG. 2 , another embodiment ofwell system 20 is illustrated. In this embodiment, thewellbore section 26 is a generally vertical wellbore from which a plurality of thelateral wellbores 24 extend. In each of the illustratedlateral wellbore sections 24, anindependent completion 30 is deployed. Theindependent completions 30 are each fully self-sustained systems which independently communicate withwell completion 28 invertical wellbore 26 viawireless telemetry system 62. The overall system enables independent flow control and/or other control functions in eachlateral wellbore section 24 without requiring connecting equipment or electrical cables between theindependent completions 30 and thewell completion 28. - In the embodiment illustrated in
FIG. 2 , eachindependent completion 30 comprises removable andretrievable power unit 44. As similarly described with reference toFIG. 1 , eachpower unit 30 comprises thepower generator 46 coupled with the correspondingpower storage device 48. This enables electrical power to be supplied toelectrical devices 52, e.g.flow control valves 54 andsensors 56, via thepower generator 46 and/or thepower storage device 48. Thewireless telemetry system 62 may be designed to independently handle transmission of data signals from each of theindependent completions 30 and to transmit control signals to specificindependent completions 30 so as to control fluid flow and/or other functions within eachlateral wellbore section 24. - In the embodiments illustrated in
FIGS. 1 and 2 , thepower unit 44 may be retrieved when necessary to recharge thepower storage device 48, to service thepower unit 44, or to replace thepower unit 44 with a new or different power unit. For retrieval, thepower unit 44 may be coupled with an appropriate fishing tool or other retrieval tool and pulled to a surface location. For example, thepower unit 44 may be sized for retrieval up through an interior of thewell completion 28 located inwellbore section 26. The new or servicedpower unit 44 is then simply conveyed downhole through the interior ofwell completion 28 and re-engaged with the remainder of the correspondingindependent completion 30 residing in the correspondingwellbore section 24, e.g. a corresponding lateral wellbore section or suitable non-lateral wellbore section. - Referring generally to
FIG. 3 , a more detailed example ofoverall wellbore system 20 and ofindependent completion 30 is illustrated. However, theindependent completion 30, as well as other components and systems of theoverall well system 20, may be adjusted with a variety of additional and/or alternate components and systems. The specific components and the arrangement of components and systems depends on the parameters of a given application and environment. - In the example illustrated, the
power unit 44 comprisespower generator 46 in the form of aturbine generator 70 and further comprisespower storage 48 in the form of arechargeable battery 72. Thepower unit 44 also includescoupling mechanism 60 in the form of aninductive coupler 74.Turbine generator 70 andrechargeable battery 72 are electrically coupled toelectrical devices 52 viainductive coupler 74. For example, electrical power signals and/or data signals may be transferred throughinductive coupler 74 to or from electrical devices, such as electricalflow control valve 54,sensors 56, and acorresponding telemetry unit 76 which is used to transfer signals to or from electricflow control valve 54 and/orsensors 56 viaconductors 58 in cooperation withinductive coupler 74. - In the embodiment illustrated in
FIG. 3 , thepower unit 44 may be secured within an expandedhousing portion 78 via alocking mechanism 80 disposed betweenpower unit 44 andhousing portion 78. The electricalflow control valve 54 is powered bypower unit 44 and actuated to selectively control the flow of fluid, e.g. production fluid, alonglateral wellbore section 24. For example, the electricalflow control valve 54 may be selectively opened to enable flow of well fluid from the surroundingwell zone 38 intoindependent completion 30 throughappropriate inlet ports 82. The well fluid then flows through theflow control valve 54 and along an interior ofindependent completion 30, as represented byarrows 84. The production fluid continues to flow through an interior of theinductive coupler 74 and is released into expandedhousing portion 78, as represented byarrows 86. - Once in expanded
housing portion 78, the production fluid flows along an exterior ofrechargeable battery 72 within the expandedhousing portion 78 until passing throughturbine generator 70. The flow of fluid throughturbine generator 70 causes rotation of the turbine and generation of electrical power which is supplied torechargeable battery 72 and/or toelectrical devices 52 ofindependent completion 30 viaconductors 58. After passing throughturbine generator 70, the produced well fluid continues to flow intovertical wellbore section 26 and up throughwell completion 28 for production to a desired surface location. In some embodiments, thewell completion 28 may comprise one or more electric submersible pumping systems designed to produce fluid to the surface location while drawing fluid into thelateral wellbore section 24. - The embodiment illustrated in
FIG. 3 illustrates asingle packer 42, howeveradditional packers 42 may be used to isolate additionalwell zones 38 alonglateral wellbore section 24. Furthermore, a variety oftelemetry systems 62 may be employed to communicate signals between theindependent completion 30 and thewell completion 28 located in a different wellbore section. As discussed above, the telemetry system may comprise a wireless telemetry system, such as an acoustic telemetry system or an electromagnetic wireless telemetry system. In the specific example illustrated,telemetry system 62 may comprise an electromagnetic wireless telemetry system or an acoustic telemetry system. - The
downhole turbine generator 70,battery 72,inductive coupler 74, andwireless telemetry system 62 may be used in cooperation to fully control and power the independent,intelligent completion 30 located inlateral wellbore section 24. As theturbine generator 70 is rotated by the flowing well fluid, electrical signals are output and those electrical power signals may be rectified into a DC signal for charging thebattery 72. When a wireless command from the surface is transmitted to theindependent completion 30 viawireless telemetry system 62 to, for example, open a valve or to transmit a sensor reading, thebattery 72 sends the correct amount of power to the flow control valve actuator or to the appropriate sensor through theinductive coupler 74. -
Telemetry unit 76, or another suitable independent completion component, may also be used to distribute the power frompower unit 44 to all of the electricallypowered completion components 52. Feedback may be continuously sent to the surface via thewireless telemetry system 62. The use ofpower storage device 48 andwireless telemetry system 62 enables operation of and control over theindependent completion 30 even during a well shut-in when no production fluid flows. The localized power storage provided bypower storage device 48 allows an operator to shut-in the well for a finite period of time whiledevices 52 are powered by thepower storage device 48. Even during shut-in, sensor readings regarding pressure build-up and/or other parameters may be obtained and other well testing can be conducted. The resulting data may be transmitted to the surface with the aid ofwireless telemetry system 62 during the finite shut-in period. - If a failure event occurs or if an end of service life for
power unit 44 is anticipated, theentire power unit 44 may be removed by releasing thelocking mechanism 80. The power unit portion of theinductive coupler 74 is simply pulled or otherwise disengaged from the remainder of theindependent completion 30 and retrieved to the surface. For example, applying a pulling force topower unit 44 may be used to cause release of lockingmechanism 80 and disengagement ofinductive coupler 74. As discussed above, theentire power unit 44 may be designed with a sufficiently small diameter or cross-section so that it may be pulled up through an interior ofwell completion 28. Removal through the interior of thecompletion 28 obviates the need to remove any uphole hardware to perform the servicing or replacement operation. After service, thepower unit 44 may simply be re-deployed down throughwell completion 28 and locked into place within theindependent completion 30 vialocking mechanism 80. As the power unit is moved into position withinindependent completion 30, the inductive coupler also is again connected to allow for electrical signals to be transmitted from and/or toelectrical devices 52. - However, the components of
power unit 44,independent completion 30, andoverall well system 20 can be adjusted to accommodate a variety of structural, operational, and/or environmental parameters. For example, various combinations of packers, flow control valves, telemetry systems, power generators, power storage devices, sensors and other components may be used to achieve the desired flow control or other downhole functional control. Additionally, the number and arrangement of wellbore sections and well zones along each wellbore section may vary substantially from one well application to another. In some applications, wellbore sections are disposed along lateral wellbores while other applications have at least one wellbore section in a non-lateral, e.g. vertical, wellbore. The technique and mechanisms used to deploy and retrieve the power units also may change from one application to another. - Although only a few embodiments of the present disclosure have been described in detail above, those of ordinary skill in the art will readily appreciate that many modifications are possible without materially departing from the teachings of this disclosure. Accordingly, such modifications are intended to be included within the scope of this disclosure as defined in the claims.
Claims (20)
1. A system for use in a well, comprising:
a well completion deployed in a generally vertical wellbore;
an independent completion deployed in a lateral wellbore, the independent completion comprising a power unit having a power generator and a power storage to store energy generated by the power generator, the power unit being removably engaged within the independent completion to enable removal and re-engagement of the power unit; and
a wireless telemetry system positioned to communicate signals between the independent completion and the well completion.
2. The system is recited in claim 1 , wherein the independent completion further comprises a flow control valve.
3. The system is recited in claim 1 , wherein the independent completion further comprises a sensor which receives power from the power storage, wherein data from the sensor is transmitted via the wireless telemetry system.
4. The system is recited in claim 1 , wherein the independent completion further comprises a plurality of electrical devices receiving power from the power storage.
5. The system is recited in claim 1 , wherein the power storage is coupled to an electrical device via an inductive coupler in the independent completion.
6. The system as recited in claim 1 , wherein the power storage comprises a rechargeable battery.
7. The system as recited in claim 1 , wherein the power generator comprises a turbine rotated by fluid flowing along the lateral wellbore.
8. The system as recited in claim 1 , wherein the wireless telemetry system comprises an electromagnetic wireless telemetry system.
9. The system as recited in claim 1 , wherein the wireless telemetry system comprises a pressure pulse system.
10. A method, comprising:
placing an independent completion in a wellbore section;
providing the independent completion with a removable power unit having a hydraulically driven power generator coupled to a power storage; and
communicating data between the independent completion and a second completion located in a second wellbore section.
11. The method as recited in claim 10 , wherein communicating comprises communicating data wirelessly.
12. The method as recited in claim 10 , wherein communicating comprises communicating data to the second completion located in a generally vertical wellbore section.
13. The method as recited in claim 10 , wherein providing comprises coupling the removable power unit with a remainder of the independent completion via an inductive coupler and a lock mechanism.
14. The method as recited in claim 10 , wherein providing comprises providing the independent completion with the removable power unit having the hydraulically driven power generator in the form of a turbine and the power storage in the form of a battery.
15. The method as recited in claim 10 , further comprising locating the independent completion in a lateral wellbore and using a sensor and a flow control valve in the independent completion to monitor and control flow in the lateral wellbore, wherein communicating comprises communicating data from the sensor to the second completion via wireless telemetry.
16. The method as recited in claim 10 , wherein communicating comprises communicating via a wireless, acoustic telemetry system.
17. The method as recited in claim 10 , further comprising removing the removable power unit through an interior of the second completion.
18. A system for use in a wellbore, comprising:
a remote, independent completion deployed in a wellbore, the remote, independent completion comprising a power unit which is selectively engageable and disengageable from a remainder of the remote, independent completion, the power unit comprising a power generator and a power storage.
19. The system as recited in claim 18 , wherein the remote, independent completion further comprises a wireless telemetry system.
20. The system as recited in claim 19 , further comprising a second, downhole completion in communication with the remote, independent completion via the wireless telemetry system.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US13/233,206 US20120067567A1 (en) | 2010-09-22 | 2011-09-15 | Downhole completion system with retrievable power unit |
NO20111279A NO20111279A1 (en) | 2010-09-22 | 2011-09-21 | Down-hole replenishment system with pull-out power unit |
BRPI1105752-1A BRPI1105752A2 (en) | 2010-09-22 | 2011-09-21 | SYSTEM FOR USE IN A WELL, METHOD, AND SYSTEM FOR USE IN A WELL |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US38522910P | 2010-09-22 | 2010-09-22 | |
US13/233,206 US20120067567A1 (en) | 2010-09-22 | 2011-09-15 | Downhole completion system with retrievable power unit |
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US20120067567A1 true US20120067567A1 (en) | 2012-03-22 |
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US13/233,206 Abandoned US20120067567A1 (en) | 2010-09-22 | 2011-09-15 | Downhole completion system with retrievable power unit |
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US11391132B2 (en) | 2020-05-28 | 2022-07-19 | Saudi Arabian Oil Company | Turbine powered electrical submersible pump system |
US20230212939A1 (en) * | 2021-12-30 | 2023-07-06 | Halliburton Energy Services, Inc. | Borehole geometry sensor and running tool assemblies and methods to deploy a completion component in a lateral bore |
US20230366291A1 (en) * | 2022-05-16 | 2023-11-16 | Halliburton Energy Services, Inc. | Wireless flow control devices and methods to reestablish fluid flow through a flow control device |
US11952862B2 (en) * | 2022-05-16 | 2024-04-09 | Halliburton Energy Services, Inc | Wireless flow control devices and methods to reestablish fluid flow through a flow control device |
US20240084673A1 (en) * | 2022-09-08 | 2024-03-14 | Saudi Arabian Oil Company | Method for downhole installation of batteries with recharging and energy harvesting systems in dedicated compartments |
Also Published As
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NO20111279A1 (en) | 2012-03-23 |
BRPI1105752A2 (en) | 2014-11-25 |
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