Jet pump replacing electric submersible pump production system and production method

Abstract

The invention discloses a jet pump replacing electric submersible pump production system and method. The jet pump replacing electric submersible pump production system comprises a ground device, a wellhead device, an underground pipe column combination and a replacing lifting tool. The ground device comprises a water injection pump, a first liquid inlet pipeline, a second liquid inlet pipeline, a first liquid outlet pipeline and a second liquid outlet pipeline; the wellhead device comprises a Christmas tree and a wellhead four-way joint; the underground pipe column combination comprises a casing pipe column combination and an oil pipe column combination; the replacing lifting tool comprises a Y connector isolation sleeve and a jet pump core. According to the production system and method for replacing the electric submersible pump with the jet pump, the jet pump can be rapidly adopted for production after the electric submersible pump well breaks down, the oil well laying time is shortened, and the oil well production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of oil and natural gas exploitation, and in particular to a production system and a production method for a jet pump replacing an electric submersible pump. Background Art

[0002] ESPs offer advantages such as high displacement and strong adaptability. Offshore oilfields generally use ESPs as the mainstream artificial lift method. Currently, ESPs have a lifespan of approximately three years. After an ESP failure, the well must be shut down for workover before production can resume. Offshore platforms are divided into those without workover rigs and those with workover rigs. Workover rig-equipped platforms can generally quickly perform workover operations after an ESP failure, reducing the time the well remains idle and expediting production. Platforms without workover rigs can only rely on drillships for workover operations. Due to the high cost and limited resources of drillships, platforms without workover rigs typically wait for multiple wells to fail before centrally working on them using a drillship. This prolongs the time it takes to resume production, significantly reducing the well's crude oil production and resulting in economic losses. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a production system and production method for a jet pump to replace an electric submersible pump, so as to reduce the lying time of a well with an electric pump failure and maximize the crude oil production of the well with an electric pump failure.

[0004] In a first aspect, the present invention provides a production system in which a jet pump replaces an electric submersible pump, which is realized by adopting the following technical solutions.

[0005] A jet pump takes over from an electric submersible pump production system, comprising a surface device, a wellhead device, a downhole tubing assembly, and a takeover lifting tool;

[0006] The downhole tubular string assembly includes a casing string assembly and a tubing string assembly; the tubing string assembly includes, arranged in order from top to bottom, a tubing hanger, a tubing, a Y-joint, a seating joint, an electric pump unit, a circulating sleeve, and a packer; the casing string assembly, the tubing string assembly, and the packer constitute a first fluid passage; the tubing string assembly above the circulating sleeve constitutes a second fluid passage; the tubing string assembly below the circulating sleeve constitutes a third fluid passage; the seating joint is provided with a seating shoulder; and the circulating sleeve is provided with a sleeve fluid outlet and a locking groove;

[0007] The replacement lifting tool includes a Y-joint isolation sleeve and a jet pump core; the Y-joint isolation sleeve is placed on the seating shoulder, and includes an isolation sleeve salvaging head, an isolation sleeve liquid outlet, an isolation sleeve upper seal, and an isolation sleeve lower seal; the jet pump core includes a jet pump salvaging head, an jet pump upper seal, a jet pump mixed liquid outlet, and a jet pump lower seal, and the jet pump mixed liquid outlet is located between the jet pump upper seal and the jet pump lower seal and is connected to the sleeve liquid outlet; a lock core is provided at the bottom of the jet pump core, which cooperates with the locking groove.

[0008] Furthermore, the surface device includes a water injection pump, a first liquid inlet pipeline, a second liquid inlet pipeline, a first liquid outlet pipeline, and a second liquid outlet pipeline, wherein the first liquid outlet pipeline and the second liquid outlet pipeline are connected to the production process; the water injection pump, the first liquid inlet pipeline and the second liquid inlet pipeline are connected in sequence; the first liquid inlet pipeline and the second liquid inlet pipeline are respectively provided with a first valve and a second valve;

[0009] The wellhead assembly includes a Christmas tree and a wellhead spool. The Christmas tree includes a Christmas tree left-wing valve, a Christmas tree right-wing valve, and a Christmas tree top valve. The wellhead spool includes a four-way left-wing valve and a four-way right-wing valve. The first liquid inlet pipeline is connected to the four-way left-wing valve. One end of the second liquid inlet pipeline is connected between the first valve and the four-way left-wing valve, and the other end is connected to the Christmas tree left-wing valve. The first liquid outlet pipeline is connected to the Christmas tree right-wing valve. The second liquid outlet pipeline is connected to the four-way right-wing valve.

[0010] Furthermore, the pressure rating of the water injection pump is 10-30 MPa.

[0011] Furthermore, the jet pump core is a forward circulation pump core or a reverse circulation pump core.

[0012] Furthermore, the isolation sleeve has 2-3 liquid outlets, which are distributed at equal angles.

[0013] Furthermore, the upper seal of the isolation sleeve is an O-type rubber ring seal, and the lower seal of the isolation sleeve is a V-shaped packing seal; the upper seal and the lower seal of the jet pump are both O-type rubber ring seals.

[0014] Furthermore, the packer is of insert type or compression type.

[0015] Furthermore, the switching mode of the circulating sleeve is a mechanical switch or a hydraulic control switch.

[0016] In a second aspect, the present invention provides a method for producing a jet pump to replace an electric submersible pump, which is achieved by adopting the following technical solution.

[0017] A method for producing a jet pump to replace an electric submersible pump is based on the above-mentioned production system and adopts positive injection of power fluid for production. The steps are as follows:

[0018] S1. Open the circulation sleeve to perform well washing, and replace the crude oil in the first fluid channel and the second fluid channel with produced water;

[0019] S2, the wireline running tool, uses wireline operation to sequentially run the positive circulation jet pump core and Y-joint isolation sleeve, and respectively seat them in the circulation sleeve and landing joint, and then pull out the wireline equipment and restore the wellhead;

[0020] S3, reverse the wellhead injection process, close the four-way left wing valve, the Christmas tree top valve and the Christmas tree right wing valve, and open the Christmas tree left wing valve and the four-way right wing valve;

[0021] S4. Positive injection of power fluid to resume production. Open the first valve and the second valve, start the water injection pump to inject power fluid. The power fluid enters the second fluid channel along the surface process and mixes with the formation crude oil in the third fluid channel in the positive circulation jet pump core. The mixed liquid flows out from the mixed liquid outlet of the jet pump and enters the first fluid channel through the liquid outlet of the sliding sleeve to reach the wellhead. After reaching the wellhead, the mixed liquid enters the production process through the second liquid outlet pipeline for the next oil-water treatment, thus completing the positive injection of power fluid production.

[0022] In a third aspect, the present invention provides another method for producing a jet pump to replace an electric submersible pump, which is achieved by adopting the following technical solution.

[0023] A method for producing a jet pump to replace an electric submersible pump is based on the above-mentioned production system and adopts reverse injection of power fluid for production. The steps are as follows:

[0024] S1. Open the circulation sleeve to perform well washing, and replace the crude oil in the first fluid channel and the second fluid channel with produced water;

[0025] S2, the wireline running tool, uses wireline operation to sequentially run the reverse circulation jet pump core and Y-joint isolation sleeve, and respectively seat them in the circulation sleeve and landing joint, and then pull out the wireline equipment and restore the wellhead;

[0026] S3, reverse injection wellhead process, open the four-way left wing valve and the Christmas tree right wing valve, close the Christmas tree top valve, the Christmas tree left wing valve and the four-way right wing valve;

[0027] S4. Back-inject power fluid to resume production. Open the first valve, close the second valve, start the water injection pump to inject power fluid. The power fluid enters the first fluid channel along the surface process and mixes with the formation crude oil in the third fluid channel in the reverse circulation jet pump core. The mixed liquid enters the second fluid channel and then reaches the wellhead. After reaching the wellhead, the mixed liquid enters the production process through the first liquid outlet pipeline for the next oil-water treatment, thus completing the back-injection power fluid production.

[0028] This application has the following beneficial effects.

[0029] (1) The present invention has high operating efficiency and can quickly complete downhole tool installation only through wireline operation;

[0030] (2) The present invention has low operating costs. It can restore the production of a faulty well without moving the tubing string through a workover rig or drilling ship, which greatly reduces the operating costs.

[0031] (3) The present invention can effectively reduce crude oil losses. Through this system and method, production can be quickly restored during the period between the failure of an oil well and the start of a well repair with a moving tubing string. The system can use a variety of methods to quickly replace the electric pump well with a jet pump to quickly restore oil well production after a well failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the system during normal production of the electric pump of the present invention;

[0033] Figure 2 This is a schematic diagram of a system using a jet pump for production after an electric pump failure of the present invention;

[0034] Figure 3 This is an enlarged schematic diagram of the Y-joint isolation sleeve when the jet pump is used for production after the electric pump fails;

[0035] Figure 4 It is an enlarged schematic diagram of the sliding sleeve when the jet pump is used for production after the electric pump of the present invention fails.

[0036] Among them, 1. Water injection pump; 2. First liquid inlet pipeline; 21. First valve; 3. Second liquid inlet pipeline; 31. Second valve; 4. Christmas tree; 41. Christmas tree left wing valve; 42. Christmas tree right wing valve; 43. Christmas tree top valve; 5. Wellhead spool; 51. Tubing hanger; 52. Four-way left wing valve; 53. Four-way right wing valve; 6. First liquid outlet pipeline; 7. Second liquid outlet pipeline; 8. Casing string assembly; 9. Tubing string assembly; 91. Y-connector; 92. Electric pump unit; 93. Seating joint; 931. Seating shoulder; 9 4. Circulating sleeve; 941. Sleeve liquid outlet; 942. Locking groove; 97. Packer; 98. Oil pipe; 10. Y-joint isolation sleeve; 101. Isolation sleeve fishing head; 102. Isolation sleeve liquid outlet; 103. Isolation sleeve upper seal; 104. Isolation sleeve lower seal; 11. Jet pump core; 111. Jet pump fishing head; 112. Jet pump upper seal; 113. Jet pump mixed liquid outlet; 114. Jet pump lower seal; 12. First fluid channel; 13. Second fluid channel; 14. Third fluid channel; 15. Y plug. DETAILED DESCRIPTION

[0037] The present patent application is further described below with reference to the embodiments.

[0038] Figure 1 The diagram shows the structure of the electric pump well during normal production. Figure 1As shown, a tubing string assembly 9 is lowered into the oil well. From bottom to top, tubing string assembly 9 includes a packer 97, a circulating sleeve 94, an electric pump unit 92, a landing joint 93, and a Y-joint 91, all of which are connected to the wellhead and tubing hanger 51 via tubing 98. The tubing hanger 51 suspends the entire tubing string assembly 9 within the wellhead spool 5 and sets the packer 97. A Y-plug 15 is deployed via a wireline to the landing joint 93, separating the landing joint 93 into two independent sections. A Christmas tree 4 is installed above the wellhead spool 5 and connected to the surface system. The surface system includes a water injection pump 1, a first liquid inlet line 2, a second liquid inlet line 3, a first liquid outlet line 6, and a second liquid outlet line 7. The first and second liquid outlet lines 6 and 7 are connected to the production process. The produced fluid enters the oil and gas processing system for oil-water separation. The water injection pump 1, first liquid inlet pipeline 2, and second liquid inlet pipeline 3 are connected in sequence. First and second liquid inlet pipelines 2 and 3 are respectively equipped with first and second valves 21 and 31. The Christmas tree 4 includes a left-wing valve 41, a right-wing valve 42, and a top-end valve 43. The wellhead spool 5 includes a four-way left-wing valve 52 and a four-way left-wing valve 53. The first liquid inlet pipeline 2 is connected to the four-way left-wing valve 52. One end of the second liquid inlet pipeline 3 is connected between the first valve 21 and the four-way left-wing valve 52, and the other end is connected to the left-wing valve 41.

[0039] Reversing the production process, close four-way left wing valve 52, four-way left wing valve 53, Christmas tree upper valve 43, and Christmas tree left wing valve 41. Open Christmas tree right wing valve 42. Open circulation sleeve 94 and start pumping. Formation crude oil flows through third fluid channel 14, circulation sleeve 94, into first fluid channel 12 formed by tubing string assembly 9 and packer 97, then through electric pump unit 92 to second fluid channel 13, and finally through Christmas tree right wing valve 42 to enter the production process.

[0040] When the electric pump unit 92 fails, the oil well will stop producing. Figure 2The schematic diagram shows a structure using the original tubing string structure to replace an electric submersible pump with a jet pump for production. The circulating sleeve 94 is opened for well washing, and the crude oil in the first and second fluid channels 12, 13 is displaced with produced water. After well washing, the Y-plug 15 is removed using a wireline, releasing the isolation at the landing joint 93. The jet pump core 11 is then introduced using a wireline. A lock core at the bottom of the core 11 engages with a locking groove 942, securing it within the circulating sleeve 94. The core 11 also includes a jet pump fishing head 111, an upper seal 112, a lower seal 114, and a mixed liquid outlet 113. The mixed liquid outlet 113 is located between the upper and lower seals 112, 114, and communicates with the sleeve outlet 941. The core 11 can be either a forward or reverse circulation pump core. Continuing with the wireline operation, the Y-joint isolation sleeve 10 is lowered to the landing joint 93. The Y-joint isolation sleeve 10 includes an isolation sleeve fishing head 101, an isolation sleeve liquid outlet 102, an isolation sleeve upper seal 103, and an isolation sleeve lower seal 104. There are two to three isolation sleeve liquid outlets 102, equidistantly spaced. The isolation sleeve upper seal 103 is an O-ring seal, and the isolation sleeve lower seal 104 is a V-packing seal. The jet pump upper seal 112 and jet pump lower seal 114 are both O-ring seals.

[0041] When a jet pump replaces an electric submersible pump production system according to an embodiment of the present invention is used, the following two methods may be included:

[0042] The first method involves positive injection of power fluid for production, i.e., injecting power fluid from within the tubing string assembly 9. The jet pump core 11 used for this positive injection is a positive circulation pump core. To perform the reverse positive injection wellhead process, close the four-way left wing valve 52, the Christmas tree upper valve 43, and the Christmas tree right wing valve 42, then open the Christmas tree left wing valve 41 and the four-way right wing valve 53. Open the first valve 21 and the second valve 31, start the water injection pump 1, and inject power fluid. The power fluid flows along the surface flow path into the second fluid channel 13, where it mixes with the formation crude oil in the third fluid channel 14 within the positive circulation jet pump core 11. The mixed liquid flows out of the jet pump mixed liquid outlet 113, passes through the sleeve liquid outlet 941, enters the first fluid channel 12, and reaches the wellhead. After reaching the wellhead, the mixed liquid enters the production process through the second liquid outlet pipeline 7 for the next step of oil-water treatment, completing the positive injection power fluid production.

[0043] The second method involves reverse injection of power fluid for production, injecting power fluid from within the first fluid channel 12. The jet pump core 11 used for this reverse injection process is a reverse circulation pump core. To perform the reverse injection wellhead process, open the four-way left-wing valve 52 and the right-wing valve 42 of the Christmas tree, and close the Christmas tree top valve 43, the left-wing valve 41 of the Christmas tree, and the four-way right-wing valve 53. Open the first valve 21, close the second valve 31, and start the water injection pump 1 to inject power fluid. The power fluid flows along the surface into the first fluid channel 12, where it mixes with the formation crude oil in the third fluid channel 14 within the reverse circulation jet pump core 11. The mixed liquid then enters the second fluid channel 13 and reaches the wellhead. Once there, it enters the production process through the first outlet pipeline 6 for the next step of oil-water treatment, completing the reverse injection power fluid production.

[0044] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A jet pump replacing an electric submersible pump production system, characterized in that: It includes surface equipment, wellhead equipment, downhole tubular assembly and replacement lifting tools; The downhole tubular string assembly comprises a casing string assembly (8) and an oil tubing string assembly (9); the oil tubing string assembly (9) comprises an oil tubing hanger (51), an oil tubing (98), a Y joint (91), a seating joint (93), an electric pump unit (92), a circulating sleeve (94) and a packer (97) which are arranged in sequence from top to bottom; the casing string assembly (8), the oil tubing string assembly (9) and the packer (97) constitute a first fluid passage (12); the interior of the oil tubing string assembly (9) above the circulating sleeve (94) constitutes a second fluid passage (13); the interior of the oil tubing string assembly (9) below the circulating sleeve (94) constitutes a third fluid passage (14); the seating joint (93) is provided with a seating shoulder (931); the circulating sleeve (94) is provided with a sleeve fluid outlet (941) and a locking groove (942); The replacement lifting tool comprises a Y-joint isolation sleeve (10) and a jet pump core (11); the Y-joint isolation sleeve (10) is placed on a seating shoulder (931), and comprises an isolation sleeve salvaging head (101), an isolation sleeve liquid outlet (102), an isolation sleeve upper seal (103), and an isolation sleeve lower seal (104); the jet pump core (11) comprises a jet pump salvaging head (111), an jet pump upper seal (112), a jet pump mixed liquid outlet (113), and a jet pump lower seal (114); the jet pump mixed liquid outlet (113) is located between the jet pump upper seal (112) and the jet pump lower seal (114) and is connected to the sleeve liquid outlet (941); a lock core that cooperates with the locking groove (942) is provided at the bottom of the jet pump core (11).

2. A jet pump replacing electric submersible pump production system according to claim 1, characterized in that: The surface device comprises a water injection pump (1), a first liquid inlet pipeline (2), a second liquid inlet pipeline (3), a first liquid outlet pipeline (6), and a second liquid outlet pipeline (7); the first liquid outlet pipeline (6) and the second liquid outlet pipeline (7) are connected to a production process; the water injection pump (1), the first liquid inlet pipeline (2) and the second liquid inlet pipeline (3) are connected in sequence; the first liquid inlet pipeline (2) and the second liquid inlet pipeline (3) are respectively provided with a first valve (21) and a second valve (31); The wellhead device comprises a Christmas tree (4) and a wellhead spool (5); the Christmas tree (4) comprises a Christmas tree left wing valve (41), a Christmas tree right wing valve (42) and a Christmas tree upper end valve (43); the wellhead spool (5) comprises a four-way left wing valve (52) and a four-way right wing valve (53); the first liquid inlet pipeline (2) is connected to the four-way left wing valve (52); one end of the second liquid inlet pipeline (3) is connected to the first valve (21) and the four-way left wing valve (52), and the other end is connected to the Christmas tree left wing valve (41); the first liquid outlet pipeline (6) is connected to the Christmas tree right wing valve (42); the second liquid outlet pipeline (7) is connected to the four-way right wing valve (53).

3. A jet pump replacing electric submersible pump production system according to claim 2, characterized in that: The pressure rating of the water injection pump (1) is 10-30 MPa.

4. A jet pump replacing electric submersible pump production system according to claim 1 or 2, characterized in that: The jet pump core (11) is a positive circulation pump core or a reverse circulation pump core.

5. A jet pump replacing electric submersible pump production system according to claim 1 or 2, characterized in that: The number of the isolation sleeve liquid outlets (102) is 2-3 and they are distributed at equal angles.

6. A jet pump replacing electric submersible pump production system according to claim 1 or 2, characterized in that: The upper seal (103) of the isolation sleeve is an O-type rubber ring seal, and the lower seal (104) of the isolation sleeve is a V-type packing seal; the upper seal (112) of the jet pump and the lower seal (114) of the jet pump are both O-type rubber ring seals.

7. A jet pump replacing electric submersible pump production system according to claim 1 or 2, characterized in that: The packer (97) is of insertion type or compression type.

8. A jet pump replacing electric submersible pump production system according to claim 1 or 2, characterized in that: The circulating sleeve (94) is switched in a mechanical manner or in a hydraulically controlled manner.

9. A method for producing a jet pump to replace an electric submersible pump, characterized in that: Based on the production system described in any one of claims 1 to 8, the production is carried out by positive injection of power fluid, and the steps are as follows: S1, opening the circulation sleeve (94) to wash the well, and replacing the crude oil in the first fluid channel (12) and the second fluid channel (13) with produced water; S2, a wireline operation running tool is used to sequentially run the positive circulation jet pump core (11) and the Y-joint isolation sleeve (10) using a wireline operation, and respectively seat them in the circulation sleeve (94) and the landing joint (93), and then pull out the wireline equipment and restore the wellhead; S3, reverse the wellhead injection process, close the four-way left wing valve (52), the Christmas tree upper end valve (43) and the Christmas tree right wing valve (42), and open the Christmas tree left wing valve (41) and the four-way right wing valve (53); S4, positive injection of power fluid to resume production, open the first valve (21) and the second valve (31), start the water injection pump (1) to inject power fluid, the power fluid enters the second fluid channel (13) along the surface process and mixes with the formation crude oil in the third fluid channel (14) in the positive circulation jet pump core (11), the mixed liquid flows out from the jet pump mixed liquid outlet (113) and enters the first fluid channel (12) through the sleeve liquid outlet (941) to reach the wellhead, after reaching the wellhead, the mixed liquid enters the production process through the second liquid outlet pipeline (7) for the next step of oil and water treatment, thus completing the positive injection of power fluid production.

10. A method for producing a jet pump to replace an electric submersible pump, characterized in that: Based on the production system described in any one of claims 1 to 8, production is carried out by back-injection of power fluid, and the steps are as follows: S1, opening the circulation sleeve (94) to wash the well, and replacing the crude oil in the first fluid channel (12) and the second fluid channel (13) with produced water; S2, a wireline operation running tool is used to run the reverse circulation jet pump core (11) and the Y-joint isolation sleeve (10) in sequence by wireline operation, and seat them in the circulation sleeve (94) and the landing joint (93) respectively, and then the wireline equipment is pulled out and the wellhead is restored; S3, reverse injection wellhead process, open the four-way left wing valve (52) and the Christmas tree right wing valve (42), close the Christmas tree upper end valve (43), the Christmas tree left wing valve (41) and the four-way right wing valve (53); S4, reverse injection of power fluid to resume production, open the first valve (21), close the second valve (31), start the water injection pump (1) to inject power fluid, the power fluid enters the first fluid channel (12) along the surface process and mixes with the formation crude oil in the third fluid channel (14) in the reverse circulation jet pump core (11), the mixed liquid enters the second fluid channel (13) and then reaches the wellhead, after reaching the wellhead, the mixed liquid enters the production process through the first liquid outlet pipeline (6) for the next step of oil and water treatment, thus completing the reverse injection of power fluid production.

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