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Publication numberUS20090038804 A1
Publication typeApplication
Application numberUS 11/836,576
Publication dateFeb 12, 2009
Filing dateAug 9, 2007
Priority dateAug 9, 2007
Also published asEP2183463A2, WO2009154641A2, WO2009154641A3
Publication number11836576, 836576, US 2009/0038804 A1, US 2009/038804 A1, US 20090038804 A1, US 20090038804A1, US 2009038804 A1, US 2009038804A1, US-A1-20090038804, US-A1-2009038804, US2009/0038804A1, US2009/038804A1, US20090038804 A1, US20090038804A1, US2009038804 A1, US2009038804A1
InventorsWalter S. Going, III
Original AssigneeGoing Iii Walter S
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Subsurface Safety Valve for Electric Subsea Tree
US 20090038804 A1
Abstract
An all electric subsea tree can be coupled with a hydraulic pressure unit that is fed off electrical and control lines that are in the umbilical from the surface. In that way hydraulic lines do not need to be separately run from the surface to the tree. Alternatively hydraulic pressure can be generated at a downhole tool using power and control lines running from the tree to the downhole equipment. As another alternative, the downhole equipment can be run by electric motor located downhole adjacent the downhole equipment and powered and controlled by lines running from the tree to the downhole location.
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Claims(19)
1. A control system for a downhole tool, comprising:
an electric subsea tree;
a hydraulic pressure generating module mounted to or adjacent said tree operatively connected to the downhole tool.
2. The system of claim 1, wherein:
said module is connected to the downhole tool by at least one hydraulic pressure line run along a tubular string to the downhole tool.
3. The system of claim 2, wherein:
said tree provides at least one of power supply and control wire to said module.
4. The system of claim 3, wherein:
said module comprises a hydraulic pressure generating system further comprising a pump and a reservoir and a regulation system to maintain pressure in said hydraulic pressure line between predetermined values.
5. The system of claim 4, wherein:
said hydraulic pressure generating system is one of a vented system to the surrounding sea and a non-vented system.
6. The system of claim 5, wherein:
said hydraulic pressure line further comprises a wet connect for rapidly hooking up said pump to the downhole tool upon placement of said module on said tree.
7. The system of claim 1, wherein:
said downhole tool comprises a subsurface safety valve.
8. The system of claim 6, wherein:
said downhole tool comprises a subsurface safety valve.
9. A control system for a downhole tool, comprising:
an electric subsea tree;
a hydraulic pressure generating module mounted to or near the downhole tool.
10. The system of claim 9, wherein:
said tree provides at least one of power supply and control wire to said module.
11. The system of claim 10, wherein:
said module comprises a hydraulic pressure generating system further comprising a pump and a reservoir and a regulation system to maintain pressure in said hydraulic pressure line between predetermined values.
12. The system of claim 11, wherein:
said hydraulic pressure generating system is one of a vented system and a non-vented system.
13. The system of claim 12, wherein:
said hydraulic pressure generating module further comprises a wet connect for rapidly hooking up said pump to the downhole tool upon placement of said module near the downhole tool.
14. The system of claim 9, wherein:
said downhole tool comprises a subsurface safety valve.
15. The system of claim 13, wherein:
said downhole tool comprises a subsurface safety valve.
16. A control system for a downhole tool, comprising:
an electric subsea tree, said tree operatively electrically connected to a motor on the downhole tool for operation thereof.
17. The system of claim 16, wherein:
said tree provides at least one of power supply and control wire to the downhole tool.
18. The system of claim 17, wherein:
said motor directly or indirectly operates a valve member in the downhole tool between an open and a closed position.
19. The system of claim 18, wherein:
said valve member comprises a flapper on a subsurface safety valve.
Description
    FIELD OF THE INVENTION
  • [0001]
    The field of the invention is subsurface equipment that responds to hydraulic control from the surface and more particularly when that equipment is coupled with an electric subsea tree.
  • BACKGROUND OF THE INVENTION
  • [0002]
    Downhole equipment such as subsurface safety valves (SSV) is typically controlled by a hydraulic control line that runs from a surface hydraulic power supply to the SSV housing. Application of pressure holds the valve open and removal or loss of applied pressure generally results in the valve going closed. In subsea systems, a tree is installed subsea at the mud line. The tree is connected to surface located hydraulic controls through a hydraulic umbilical so that pressure can be developed in the hydraulic system at the surface can be transmitted to the downhole equipment.
  • [0003]
    More recently, all electric subsea trees have been developed to save money in removing complexity of hydraulic switching circuits as well as other reasons. When these all electric trees are deployed the umbilical to the surface no longer has a need for hydraulic lines to operate the equipment located at the tree. However, downhole equipment such as SSVs are still provided with hydraulic control. Thus to still be able to team up traditional safety valves with the new all electric subsea tree, hydraulic lines still had to be run from the surface mounted pressure generating equipment to the subsea tree, a distance that could be thousands of feet and beyond to the SSV.
  • [0004]
    The present invention improves this situation by providing a module at the tree that receives power and signal input from the umbilical and generates hydraulic pressure at the subsea tree for use by an SSV or other downhole hydraulically operated equipment. Alternatively, the downhole component such as the SSV can be constructed to receive electrical power and signal input from the tree and the hydraulic lines along the tubing can be eliminated in favor of local generation of hydraulic pressure at the housing of the downhole tool such as the SSV. Alternatively, the SSV can be reconfigured to open and close using an onboard electrically driven motor so that the hydraulic operating system can be replaced totally. These and other advantages of the present invention will be more readily understood by those skilled in the art from a review of the description of the preferred embodiment and the associated drawing while recognizing that the claims are the full measure of the invention.
  • SUMMARY OF THE INVENTION
  • [0005]
    An all electric subsea tree can be coupled with a hydraulic pressure unit that is fed off electrical and control lines that are in the umbilical from the surface. In that way hydraulic lines do not need to be separately run from the surface to the tree. Alternatively hydraulic pressure can be generated at a downhole tool using power and control lines running from the tree to the downhole equipment. As another alternative, the downhole equipment can be run by electric motor located downhole adjacent the downhole equipment and powered and controlled by lines running from the tree to the downhole location.
  • BRIEF DESCRIPTION OF THE DRAWING
  • [0006]
    FIG. 1 is a schematic of a subsea tree with a locally mounted hydraulic pressure generating unit for the safety valve downhole.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • [0007]
    FIG. 1 is a schematic representation that will be used to describe alternative design options. The variations revolve around an electric subsea tree 10 that is disposed near the mud line 12. The wellbore 14 has a tubing string 16 in it and a subsurface safety valve (SSV) 18 mounted in the tubing string 16.
  • [0008]
    A hydraulic pressure generating module 20 in one embodiment is mounted adjacent the tree 10. A power line 22 and a control line 24 extend from a control module 26 that is a part of the subsea tree 10. The umbilical 28 runs to surface at the waterline and provides power and control signals from the surface such as from a platform or a vessel (not shown). Module 20 has an onboard controller 30 to power motor 32 which runs pump 34. A low pressure switch 36 set above the minimum pressure required to hold SSV 18 open is there to sound an alarm if the pressure declines below a preset value. Conversely, a high pressure switch 38 alarms if the operating pressure exceeds a predetermined maximum. A pressure compensated reservoir 40 is provided as well as a multi-position valve 42 to direct pressure back to the reservoir 40 in the position shown in FIG. 1 or alternatively out line 44 through a wet connector 46 which is a quick connection that can be automatically connected when the module 20 is placed on the tree 10 or by a remotely operated vehicle (ROV) not shown. Line 44 is a hydraulic line down to the SSV 18 that runs along string 16 in the known manner. A pressure transmitter 48 can be connected to the pump 34 discharge t transmit the operating pressure to the surface on a real time basis. The system can be closed or it can discharge hydraulic fluid when stroking the valve 18. If the system is not closed it can be periodically replenished by an ROV or by a line run to the reservoir 40. A closed system that retains hydraulic fluid is preferred.
  • [0009]
    With the above described arrangement, there doesn't need to be any hydraulic line from the waterline to the tree 10. This allows for a more economical umbilical while still allowing SSVs 18 now on the market that operate hydraulically to continue to be operated as before.
  • [0010]
    In an alternative embodiment, the components of module 20 can be integrated into SSV 18 or along the string 16 near it so that lines 22 and 24 can continue to run into the wellbore 14 to a now relocated module 20 that is now in the wellbore close to or integrated with the housing of the SSV 18. With this arrangement, hydraulic lines don't need to be run the length of string 16 while allowing the continued use of currently available hydraulically operated SSVs such as 18.
  • [0011]
    In yet another variation, the design of the SSV 18 can be reconfigured so that it needs no hydraulic power at all. Instead lines 22 and 24 run down the string 16 to a locally mounted electric motor M that directly or indirectly powers a flapper or other closure device in the SSV 18. In this alternative, hydraulic pressure and a control system for it would not be needed. On the other hand, the currently available hydraulically operated valves could not be used and instead a different SSV design would be required for power and control input that would be all electrical.
  • [0012]
    The above description is illustrative of the preferred embodiment and many modifications may be made by those skilled in the art without departing from the invention whose scope is to be determined from the literal and equivalent scope of the claims below.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3261398 *Sep 12, 1963Jul 19, 1966Shell Oil CoApparatus for producing underwater oil fields
US3777812 *Nov 26, 1971Dec 11, 1973Exxon Production Research CoSubsea production system
US3789355 *Dec 28, 1971Jan 29, 1974Mobil Oil CorpMethod of and apparatus for logging while drilling
US3921500 *Jun 10, 1974Nov 25, 1975Chevron ResSystem for operating hydraulic apparatus
US4027286 *Apr 23, 1976May 31, 1977Trw Inc.Multiplexed data monitoring system
US4174000 *Feb 16, 1978Nov 13, 1979Fmc CorporationMethod and apparatus for interfacing a plurality of control systems for a subsea well
US4378848 *Sep 25, 1980Apr 5, 1983Fmc CorporationMethod and apparatus for controlling subsea well template production systems
US4730677 *Dec 22, 1986Mar 15, 1988Otis Engineering CorporationMethod and system for maintenance and servicing of subsea wells
US4848475 *Mar 24, 1988Jul 18, 1989The British Petroleum Company P.L.C.Sea bed process complex
US4920811 *Mar 7, 1989May 1, 1990The British Petroleum Company P.L.C.Fail-safe release actuator mechanism
US5195721 *Mar 28, 1991Mar 23, 1993Ava International CorporationFail safe valve actuator
US5280766 *Jun 26, 1991Jan 25, 1994Framo Developments (Uk) LimitedSubsea pump system
US5295547 *Nov 2, 1992Mar 22, 1994Petroleo Brasileiro S.A. PetrobrasMultiplexed electrohydraulic type of control system for use in undersea production system
US5497672 *Jun 26, 1992Mar 12, 1996Alpha Thames Engineering LimitedValve actuator
US5839508 *Jun 19, 1996Nov 24, 1998Baker Hughes IncorporatedDownhole apparatus for generating electrical power in a well
US5984260 *Oct 15, 1996Nov 16, 1999Baker Hughes IncorporatedElectrically driven actuator with failsafe feature
US6059039 *Nov 12, 1997May 9, 2000Exxonmobil Upstream Research CompanyExtendable semi-clustered subsea development system
US6102124 *Jun 30, 1999Aug 15, 2000Fmc CorporationFlying lead workover interface system
US6125938 *Aug 8, 1997Oct 3, 2000Halliburton Energy Services, Inc.Control module system for subterranean well
US6384738 *Apr 6, 1998May 7, 2002Halliburton Energy Services, Inc.Pressure impulse telemetry apparatus and method
US6536528 *Sep 29, 2000Mar 25, 2003Kellogg Brown & Root, Inc.Extended reach tie-back system
US6595487 *May 16, 2001Jul 22, 2003Kongsberg Offshore A/SElectric actuator
US6681861 *Jun 13, 2002Jan 27, 2004Schlumberger Technology CorporationPower system for a well
US6698520 *Sep 30, 2002Mar 2, 2004Abb Vetco Gray Inc.Light-intervention subsea tree system
US6715554 *Oct 9, 2000Apr 6, 2004Fmc Technologies, Inc.Slimbore subsea completion system and method
US6760275 *May 10, 2002Jul 6, 2004Kenneth J. CarstensenHigh impact communication and control system
US6988554 *May 1, 2003Jan 24, 2006Cooper Cameron CorporationSubsea choke control system
US6998724 *Feb 18, 2004Feb 14, 2006Fmc Technologies, Inc.Power generation system
US7108069 *Apr 23, 2004Sep 19, 2006Offshore Systems, Inc.Online thermal and watercut management
US7137450 *Feb 18, 2004Nov 21, 2006Fmc Technologies, Inc.Electric-hydraulic power unit
US7148812 *Dec 3, 2003Dec 12, 2006Vetco Gray Controls LimitedSystem for use in controlling a hydrocarbon production well
US7156183 *Nov 17, 2004Jan 2, 2007Fmc Technologies, Inc.Electric hydraulic power unit and method of using same
US7159662 *Feb 18, 2004Jan 9, 2007Fmc Technologies, Inc.System for controlling a hydraulic actuator, and methods of using same
US7201229 *Oct 22, 2004Apr 10, 2007Vetco Gray Inc.Tree mounted well flow interface device
US7219740 *Nov 22, 2005May 22, 2007Energy Equipment CorporationWell production and multi-purpose intervention access hub
US7287595 *Aug 25, 2006Oct 30, 2007Fmc Technologies, Inc.Electric-hydraulic power unit
US7398830 *Sep 19, 2007Jul 15, 2008Advanced Micro Devices, Inc.Electric-hydraulic power unit
US7615893 *Apr 30, 2004Nov 10, 2009Cameron International CorporationElectric control and supply system
US20040251030 *Oct 11, 2002Dec 16, 2004Appleford David EricSingle well development system
US20060231264 *Feb 9, 2006Oct 19, 2006Boyce Charles BRiserless modular subsea well intervention, method and apparatus
US20070107907 *Nov 15, 2005May 17, 2007Schlumberger Technology CorporationSystem and Method for Controlling Subsea Wells
US20080264642 *Apr 24, 2007Oct 30, 2008Horton Technologies, LlcSubsea Well Control System and Method
US20100019573 *Sep 29, 2009Jan 28, 2010Cameron International CorporationElectric control and supply system
US20100051286 *Mar 4, 2010Mcstay DanielOptical sensing system for wellhead equipment
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7650943 *Dec 22, 2005Jan 26, 2010Vetco Gray Controls LimitedHydraulic control system
US7963335 *Dec 18, 2007Jun 21, 2011Kellogg Brown & Root LlcSubsea hydraulic and pneumatic power
US8096365 *Dec 9, 2009Jan 17, 2012Vetco Gray Controls LimitedHydraulic control system
US8708054 *Dec 9, 2010Apr 29, 2014Schlumberger Technology CorporationDual path subsea control system
US8746346 *Dec 29, 2010Jun 10, 2014Vetco Gray Inc.Subsea tree workover control system
US8839868 *Sep 9, 2010Sep 23, 2014Schlumberger Technology CorporationSubsea control system with interchangeable mandrel
US8857785Feb 23, 2011Oct 14, 2014Baker Hughes IncorporatedThermo-hydraulically actuated process control valve
US9062512 *Oct 9, 2009Jun 23, 2015Onesubsea Ip Uk LimitedIntegrated installation workover control system
US20060157254 *Dec 22, 2005Jul 20, 2006Vetco Gray Controls LimitedHydraulic control system
US20080264646 *Dec 13, 2005Oct 30, 2008Vidar Sten-HalvorsenModular Actuator for Subsea Valves and Equipment, and Methods of Using Same
US20090151954 *Dec 18, 2007Jun 18, 2009Drew KrehbielSubsea hydraulic and pneumatic power
US20100078175 *Apr 1, 2010Vetco Gray Controls LimitedHydraulic Control System
US20110120722 *May 26, 2011Schlumberger Technology CorporationSubsea control system with interchangeable mandrel
US20110137471 *Dec 9, 2010Jun 9, 2011Schlumberger Technology CorporationDual path subsea control system
US20110297387 *Oct 9, 2009Dec 8, 2011Cameron International CorporationIntegrated Installation Workover Control System
US20120168169 *Dec 29, 2010Jul 5, 2012Vetco Gray Inc.Subsea tree workover control system
CN102561997A *Dec 29, 2011Jul 11, 2012韦特柯格雷公司Subsea tree workover control system
WO2011041550A2 *Sep 30, 2010Apr 7, 2011Schlumberger Canada LimitedSubsea control system with interchangeable mandrel
Classifications
U.S. Classification166/335, 166/363, 166/66.6, 166/106
International ClassificationE21B34/04, E21B43/00, E21B33/035, E21B23/00
Cooperative ClassificationE21B34/10, E21B33/0355
European ClassificationE21B33/035C, E21B34/10
Legal Events
DateCodeEventDescription
Sep 5, 2007ASAssignment
Owner name: BAKER HUGHES INCORPORATED, TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GOING, WALTER S., III;REEL/FRAME:019786/0440
Effective date: 20070821