External oil expansion chamber for seabed boosting ESP equipment
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04B-035/04
H02K-005/10
H02K-005/132
출원번호
US-0825182
(2010-06-28)
등록번호
US-8485797
(2013-07-16)
발명자
/ 주소
Martinez, Ignacio
Merrill, Dan A.
출원인 / 주소
Baker Hughes Incorporated
대리인 / 주소
Bracewell & Giuliani LLP
인용정보
피인용 횟수 :
3인용 특허 :
7
초록▼
An expansion chamber to serve ESP equipment installed on the seabed located in either a caisson or a conduit on a skid. The expansion chamber provides an external reservoir for expansion and contraction of motor oil in the ESP equipment. During operation of an ESP, the heat generated in the motor ra
An expansion chamber to serve ESP equipment installed on the seabed located in either a caisson or a conduit on a skid. The expansion chamber provides an external reservoir for expansion and contraction of motor oil in the ESP equipment. During operation of an ESP, the heat generated in the motor raises the temperature of the motor oil, causing it to expand. The expansion chamber is connected to the ESP equipment via oil lines that allow oil to expand into the expansion chamber when the temperature of the motor oil increases. The expansion chamber has a movable barrier therein that defines primary and secondary chamber. Oil communicates with the primary chamber. Formation fluid within the conduit surrounding the motor communicates with the secondary chamber.
대표청구항▼
1. A method for boosting pressure of well fluid flowing from a subsea well, surprising: mounting a motor and a pump within a subsea capsule, the motor being filled with a dielectric lubricant, deploying the capsule in a subsea location, and isolating an interior of the capsule from a hydrostaic pres
1. A method for boosting pressure of well fluid flowing from a subsea well, surprising: mounting a motor and a pump within a subsea capsule, the motor being filled with a dielectric lubricant, deploying the capsule in a subsea location, and isolating an interior of the capsule from a hydrostaic pressure of sea water in the subsea location;providing a submerged expansion housing external of the capsule in the vicinity of a sea floor, the expansion housing having a movable barrier therein, defining a primary and a secondary chamber;flowing well fluid into the interior of the capsule around the motor and into an intake of the pump and operating the motor and the pump to pump the well fluid from the capsule;communicating a dielectric lubricant pressure of the dielectric lubricant in the motor to the primary chamber within the expansion housing;communicating an intake well fluid pressure of the well fluid within the capsule before entering the intake with the secondary chamber within the expansion housing; andallowing the movable barrier to move to equalize the dielectric lubricant pressure with the well fluid intake pressure. 2. The method of clam 1, wherein the movable barrier comprises a bellows, and communicating the dielectric lubricant pressure comprises flowing the dielectric lubricant between an interior of the bellows and the motor. 3. The method of claim 2, wherein communicating the intake well fluid pressure comprises flowing the well fluid between the interior of the capsule and an exterior of the bellows. 4. The method of claim 2, wherein the primary and secondary chambers are sealed from the hydrostatic pressure of the sea water. 5. The method of claim 1, wherein the capsule is mounted on a skid and deployed on a sea floor. 6. The method of claim 1, further comprising; providing a second expansion housing having a movable barrier, therein, defining a primary chamber and a secondary chamber; whereincommunicating the intake well fluid pressure to the secondary chamber of said first mentioned expansion housing comprises communicating the well fluid in the interior of the capsule to the secondary chamber of the second expansion housing;filling the secondary chamber of said first mentioned expansion housing with dielectric lubricant and filing the primary chamber of the second expansion housing with dielectric lubricant; andcommunicating the dielectric lubricant in the secondary chamber of the first expansion housing with the dielectric lubricant in the primary chamber of the secondary expansion housing. 7. The method of claim 1. wherein the capsule is located within a caisson extending into the sea floor and the expansion housing is located on the sea floor. 8. The method of claim 1, wherein the motor is immersed in the well fluid at the intake well fluid pressure. 9. A subsea eiectrical submersible booster pumping system, comprising: a capsule adapted to be placed subsea, the capsule having an inlet leading to an interior of the capsule for receiving well fluid and an outlet, the capsule being sealed to isolate hydrostatic pressure of sea water exterior of the capsule from the interior of the capsule;a centrifugal pump within the capsule, and having an intake within the interior of the capsule for drawing well fluid from the interior of the capsule into the pump and a discharge connected to the outlet of the capsule to discharge fluid from the capsule;an electrical motor cooperatively coupled to the centrifugal pump and located within the interior of the capsule for immersion in the well fluid flowing to the intake of the pump, the motor being filled with a dieiectric lubricant;at least one expansion housing exterior of the capsule, the expansion housing having a movable barrier therein, defining a primary and a secondary chamber;a dielectric lubricant line in communication with an interior of the motor and connected to the primary chamber of the expansion housing, the dielectric lubricant line having a passage for communicating the dielectric lubricant between the motor and the primary chamber; anda well fluid line in communication with the interior of the capsule exterior of the motor, the well fluid line having a passage that communicates well fluid pressure at the intake of the pump to the secondary chamber of the expansion chamber so as to equalize a pressure of the dielectric lubricant in the motor with the well fluid pressure at the intake of the pump. 10. The system of claim 9, wherein the passage in the well fluid line communicates the well fluid to the secondary chamber. 11. The system of claim 9, wherein the movable barrier comprises a bellows that can expand and contract as the dielectric lubricant expands and contracts. 12. The system of claim 9, wherein the expansion housing is sealed so as to prevent hydrostatic pressure of sea water from acting on the primary and secondary chambers. 13. The system of claim 9, wherein the capsule is mounted on a skid adapted to be located on the sea floor. 14. The system of claim 9, wherein the passage of the well fluid line leads to the secondary chamber of the expansion housing to communicate well fluid to the secondary chamber. 15. The system of claim 9, wherein; said at least one expansion housing further comprises a second expansion housing having a movable barrier, defining a primary chamber and a secondary chamber therein;the well fluid line leads to the secondary chamber of the second expansion chamber; andthe secondary chamber of the first mentioned expansion housing and the primary chamber of second expansion housing are filled with a liquid and connected to each other with a coupling line. 16. The system of claim 15, wherein the liquid in the primary chamber of the first mentioned expansion housing, the coupling line, and the primary chamber of the second expansion housing is dielectric lubricant. 17. the system of claim 9, wherein the dielectric lubricant line and the well fluid line pass through a cap located at one end of the capsule. 18. The system of claim 9, wherein the capsule is adopted to be located within a caisson extending into the seabed. 19. A subsea booster pump system, comprising: a subsea capsule having a well fluid inlet and a well fluid outlet, the capsule being sealed so as to isolate an interior of the capsule from hydrostatic pressure of sea water;a centrifugal pump and electric motor located in the capsule, the pump having an intake in fluid communication with the interior of the capsule, the pump intake being positioned so that well fluid flowing into the well fluid inlet flows over the motor to the pump intake, the pump having a discharge coupled to the outlet of the capsule to discharge the well fluid out the outlet;an expansion housing located subsea exterior of the capsule, the expansion chamber having a movable barrier, defining a primary chamber and a secondary chamber in the expansion housing;an inlet dielectric fluid line connected between the motor and the primary chamber of the expansion housing to communicate dielectric lubricant from the motor to one side of the movable barrier; andan inlet well fluid line connected between the interior of the capsule and the secondary chamber of the expansion housing to communicate well fluid to the other side of the movable barrier at a pressure equal to pressure of the well fluid at the pump intake.
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이 특허에 인용된 특허 (7)
Lee Lawrence, Adjustable shroud for a submergible pumping system and pumping system incorporating same.
Nyilas Charles P. ; Campen ; Jr. Clifford H. ; Kujawski Joseph M., Sub-sea pumping system and associated method including pressure compensating arrangement for cooling and lubricating.
Straub Peter H. G.,CAX ; Haworth Cameron G.,CAX, System and method for protecting a submergible motor from corrosive agents in a subterranean environment.
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