IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0031240
(2011-02-20)
|
등록번호 |
US-8613311
(2013-12-24)
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발명자
/ 주소 |
- Xiao, Jinjiang
- Noui-Mehidi, Mohamed Nabil
- Bukhamseen, Ahmed Yasin
|
출원인 / 주소 |
- Saudi Arabian Oil Company
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
21 |
초록
▼
A method and apparatus for reducing erosion and friction losses in a wellbore using a power cabled deployed electric submersible pump (ESP). The apparatus can include an ESP disposed within production tubing, wherein a portion of the production tubing surrounding the ESP contains fluid openings that
A method and apparatus for reducing erosion and friction losses in a wellbore using a power cabled deployed electric submersible pump (ESP). The apparatus can include an ESP disposed within production tubing, wherein a portion of the production tubing surrounding the ESP contains fluid openings that are operable to allow produced fluids to flow outward, thereby increasing the available volume for the produced fluids. The increased volume results in lower fluid velocities of the produced fluid, which advantageously reduces erosion and friction loss.
대표청구항
▼
1. An electric submersible pump (ESP) assembly for use in a wellbore, the assembly comprising: a pump, wherein the pump comprises: a fluid inlet,a seal section,a pump discharge, anda pump motor coupled to the pump;a tubing section adapted for insertion within a casing to define an annulus between th
1. An electric submersible pump (ESP) assembly for use in a wellbore, the assembly comprising: a pump, wherein the pump comprises: a fluid inlet,a seal section,a pump discharge, anda pump motor coupled to the pump;a tubing section adapted for insertion within a casing to define an annulus between the tubing section and the casing, the tubing section circumferentially surrounding a portion of the pump, wherein the tubing section comprises fluid openings that are operable to allow produced fluid from the wellbore to flow radially outward and occupy a greater volume than a volume defined by the tubing section alone, thereby reducing a fluid velocity of the produced fluid; anda lower packer and an upper packer, the lower packer being connected to the casing and a production tubing, the lower packer being positioned proximate the lower end of the production tubing, the lower packer being operable to support the positioning of the production tubing within the casing, the upper packer connected to the casing and the production tubing, the upper packer being positioned at a point above the lower packer thereby forming a first interstitial space in the annulus between the upper packer and the lower packer and a second interstitial space in the annulus between the upper packer and the surface. 2. The ESP assembly as claimed in claim 1, wherein the tubing section is integral within a string of production tubing that is adapted for insertion into the wellbore. 3. The ESP assembly as claimed in claim 1, further comprising a safety valve positioned at the lower end of the tubing section, the safety valve having an open and a closed position, wherein the produced fluid from the wellbore enters the tubing section through the safety valve when the safety valve is in an open position. 4. The ESP assembly as claimed in claim 3, further comprising a control line in communication with the safety valve. 5. The ESP assembly as claimed in claim 1, wherein the fluid openings are selected from the group consisting of slots, holes, perforations, and combinations thereof, wherein tubular integrity of the production tubing is not compromised. 6. An electric submersible pump (ESP) assembly for use in a wellbore, the assembly comprising: a casing positioned within a bore of a hydrocarbon well, the casing being in fluid communication with a producing region of a reservoir such that produced fluid can enter the casing;a production tubing positioned within the casing to provide a pathway for produced fluids dispersed from the hydrocarbon well, the production tubing having a diameter that is less than the diameter of the casing such that an annulus is formed between an outer wall of the production tubing and an inner wall of the casing, the production tubing having a lower end that is distal from the surface;a lower packer connected to the casing and the production tubing, the lower packer being positioned proximate the lower end of the production tubing, the lower packer being operable to support the positioning of the production tubing within the casing;an upper packer connected to the casing and the production tubing, the upper packer being positioned at a point above the lower packer thereby forming a first interstitial space in the annulus between the upper packer and the lower packer and a second interstitial space in the annulus between the upper packer and the surface;a safety valve positioned on an inner wall of the production tubing proximate the lower packer, the safety valve having an open position and a closed position; anda safety valve control line in communication with the safety valve,wherein the first interstitial space is in fluid communication with the production tubing, such that the assembly is operable to allow produced fluid from the producing region of the reservoir to flow from the production tubing into the first interstitial space, such that a fluid velocity of the produced fluid is less than the fluid velocity of the produced fluid if the first interstitial space was not in fluid communication with the production tubing. 7. The ESP assembly as claimed in claim 6, further comprising an absence of perforations in the casing in areas other than proximate the producing region of the reservoir. 8. The ESP assembly as claimed in claim 6, wherein the casing does not allow produced fluids to reenter the reservoir. 9. The ESP assembly as claimed in claim 6, wherein the second interstitial space is not in fluid communication with the production tubing. 10. The ESP assembly of 6, wherein the assembly is operable to house an ESP within the production tubing, wherein the ESP comprises: a pump intake positioned above the safety valve so that the produced fluids enter the pump intake;a pump discharge positioned above the upper packer and within the production tubing so that the produced fluids are discharged within inner walls of the production tubing and to the surface;a medial pump body portion extending between the pump intake and the pump discharge through which the produced fluids flow from the pump intake to the pump discharge;an isolation member positioned at an upper portion of the ESP for isolating the pump intake from the pump discharge; a motor for supplying power to the ESP; anda seal section connected between the motor and a distal end portion of the pump intake, the seal section being operable to prevent produced fluids from entering the motor. 11. The ESP assembly as claimed in claim 10, wherein the second interstitial space is not in fluid communication with the ESP. 12. The ESP assembly as claimed in claim 6, wherein the portion of the tubing between the upper packer and safety valve comprises fluid openings for allowing the produced fluids to enter the first interstitial space. 13. The ESP assembly as claimed in claim 12, wherein the fluid openings are selected from the group consisting of slots, holes, perforations, and combinations thereof, wherein tubular integrity of the production tubing is not compromised. 14. The ESP assembly as claimed in claim 6, wherein the casing extends through the producing region of the reservoir. 15. The ESP assembly as claimed in claim 6, wherein the fluid velocity of the produced fluid is not greater than 20 fps. 16. A method for enhanced well control for high fluid velocity wells, the method comprising the steps of: providing an ESP assembly, the ESP assembly selected from the group consisting of the ESP assembly as claimed in Claim 1 or Claim 6;inserting the ESP assembly into a wellbore, wherein the wellbore is in fluid communication with an underground hydrocarbon reservoir; andflowing fluid from the underground hydrocarbon reservoir through the fluid openings of the tubing string and radially outward, such that the fluid occupies a greater volume of space than a volume defined by the tubing section alone, the greater volume of space defined by both the tubing section and an annulus between the tubing section and the casing, thereby lowering the fluid velocity of the fluid. 17. A method for enhanced well control for high fluid velocity wells, the method comprising the steps of: positioning casing into a bore of a hydrocarbon well, the bore extending from a surface and having an inner diameter, wherein the casing is in fluid communication with a producing region of a reservoir such that produced fluids can enter the casing;positioning production tubing at least partially within the casing to provide a pathway for produced fluids, the production tubing having a diameter that is less than the diameter of the casing such that an annulus is formed between an outer wall of the production tubing and an inner wall of the casing, the production tubing having a lower end that is distal from the surface;connecting a lower packer to the casing and the production tubing, the lower packer being positioned proximate the lower end of the production tubing, the lower packer being operable to support the positioning of the production tubing within the casing;connecting an upper packer to the casing and the production tubing, the upper packer being positioned at a point above the lower packer thereby forming a first interstitial space in the annulus between the upper packer and the lower packer;positioning a safety valve on an inner wall of the production tubing proximate the lower packer, the safety valve having a bias between an open position and a closed position, the safety valve creating an opening when in the open position;communicating with the safety valve using a safety valve control line to control the bias of the safety valve; andallowing produced fluids to flow from the reservoir through the opening of the safety valve to the production tubing and the first interstitial space, such that the fluid velocity of the produced fluid is less than the fluid velocity of the produced fluid if the first interstitial space was not in fluid communication with the production tubing. 18. The method as claimed in claim 17, further comprising the step of operating an electric submersible pump (ESP) so that the produced fluids enter the ESP, flow through the ESP, and discharge from the ESP to an inner volume of the production tubing and to the surface. 19. The method as claimed in claim 18, wherein the second interstitial space is not in fluid communication with the ESP. 20. The method as claimed in claim 17, wherein the portion of the tubing between the upper packer and safety valve comprises fluid. 21. The method as claimed in claim 20, wherein fluid openings provided in the outer wall of the production tubing establish fluid communication between the production tubing and the first interstitial space, and wherein the fluid openings are selected from the group consisting of slots, holes, perforations, and combinations thereof, wherein tubular integrity of the production tubing is not compromised. 22. The method as claimed in claim 17, wherein the casing extends through the producing region of the reservoir. 23. The method as claimed in claim 17, wherein the fluid velocity of the produced fluid is not greater than 20 fps. 24. The method as claimed in claim 17, wherein the casing further comprises an absence of perforations in areas other than proximate the producing region of the reservoir. 25. The method as claimed in claim 17, wherein the casing is operable to prevent produced fluids from reentering the reservoir. 26. The method as claimed in claim 17, wherein the second interstitial space is not in fluid communication with the production tubing. 27. The method as claimed in claim 17, wherein the hydrocarbon well is located offshore.
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