A jet pump replaces the electric submersible pump production system and production method

Abstract

The application discloses a kind of jet pump replaces ESP production system and production method.The jet pump replaces ESP production system includes ground device, wellhead device, downhole string combination and replacement lifting tool;Ground device includes water injection pump, first liquid inlet pipeline, second liquid inlet pipeline, first liquid outlet pipeline, second liquid outlet pipeline;Wellhead device includes Christmas tree and wellhead four-way joint;Downhole string combination includes casing string combination and tubing string combination;The replacement lifting tool includes Y joint isolation sleeve and jet pump pump core.The jet pump replaces ESP production system and method of the present application can quickly use jet pump for production after ESP well failure, reduces the oil well lying well time, improves the oil well production efficiency.

Description

Technical Field

[0001] This invention relates to the field of oil and gas extraction, and in particular to a jet pump replacement electric submersible pump production system and production method. Background Technology

[0002] ESPs (Electric Submersible Pumps) have advantages such as high displacement and strong adaptability. Offshore oilfields primarily use ESPs as the mainstream method for artificial lift. Currently, the service life of ESPs is about three years. After an ESP failure, the well will be shut down for workover before production can resume. Offshore platforms are divided into platforms without workover rigs and platforms with workover rigs. Platforms with workover rigs can generally perform workover operations quickly after an ESP failure, reducing the well's downtime and restoring production as soon as possible. For platforms without workover rigs, workovers rely on drilling ships. Due to the high cost and limited resources of drilling ships, platforms without workover rigs typically wait for multiple wells to fail before using a drilling ship for concentrated workovers. This prolongs the well recovery time, significantly reduces crude oil production, and causes economic losses. Summary of the Invention

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

[0004] In a first aspect, the present invention provides a jet pump to replace electric submersible pump production system, which is achieved by the following technical solution.

[0005] A jet pump replacement electric submersible pump production system includes a surface unit, a wellhead unit, a downhole tubing assembly, and a replacement lifting tool;

[0006] The downhole tubing assembly includes a casing string assembly and a tubing string assembly; the tubing string assembly includes, from top to bottom, a tubing hanger, tubing, a Y-joint, a landing 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 channel; the interior of the tubing string assembly above the circulating sleeve constitutes a second fluid channel; the interior of the tubing string assembly below the circulating sleeve constitutes a third fluid channel; the landing joint has a landing shoulder; the circulating sleeve has a sleeve 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 landing shoulder and includes an isolation sleeve retrieval head, an isolation sleeve outlet, an upper isolation sleeve seal, and a lower isolation sleeve seal; the jet pump core includes a jet pump retrieval head, a jet pump upper seal, a jet pump mixed liquid outlet, and a jet pump lower seal, the jet pump mixed liquid outlet is located between the jet pump upper seal and the jet pump lower seal and communicates with the sliding sleeve outlet; the bottom of the jet pump core is provided with a lock core that cooperates with the locking groove.

[0008] Furthermore, the ground device includes a water injection pump, a first inlet pipeline, a second inlet pipeline, a first outlet pipeline, and a second outlet pipeline, with the first and second outlet pipelines connected to the production process; the water injection pump, the first inlet pipeline, and the second inlet pipeline are connected in sequence; a first valve and a second valve are respectively installed on the first and second inlet pipelines.

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

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

[0011] Furthermore, the jet pump core is either a positive 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-ring seal, and the lower seal of the isolation sleeve is a V-type packing seal; both the upper seal and the lower seal of the jet pump are O-ring seals.

[0014] Furthermore, the packer is either an insertion type or a compression type.

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

[0016] Secondly, the present invention provides a method for producing jet pumps to replace electric submersible pumps, which is achieved by the following technical solution.

[0017] A method for producing jet pumps to replace electric submersible pumps, based on the above-mentioned production system, uses positive injection kinetic fluid for production, and the steps are as follows:

[0018] S1. Open the circulating sleeve to flush the well, and replace the crude oil in the first fluid channel and the second fluid channel with production water;

[0019] S2. The wireline operation tool is used to sequentially lower the positive circulation jet pump core and the Y-joint isolation sleeve, which are then placed in the circulation sliding sleeve and the landing joint, respectively. The wireline equipment is then pulled out and the wellhead is restored.

[0020] S3, Reverse injection wellhead process: Close the left wing valve of the four-way valve, the upper valve of the Christmas tree and the right wing valve of the Christmas tree, and open the left wing valve of the Christmas tree and the right wing valve of the four-way valve.

[0021] S4. Resume production by injecting dynamic fluid. Open the first and second valves, start the water injection pump to inject dynamic fluid. The dynamic 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 mixture flows out from the jet pump's mixture outlet and enters the first fluid channel through the sliding sleeve outlet to reach the wellhead. After reaching the wellhead, the mixture enters the production process through the second outlet pipeline for the next step of oil and water treatment. This completes the production of dynamic fluid injection.

[0022] Thirdly, the present invention provides another method for producing jet pumps to replace electric submersible pumps, which is achieved by the following technical solution.

[0023] A method for producing jet pumps to replace electric submersible pumps, based on the above-mentioned production system, uses reverse injection kinetic fluid for production, and the steps are as follows:

[0024] S1. Open the circulating sleeve to flush the well, and replace the crude oil in the first fluid channel and the second fluid channel with production water;

[0025] S2. The wireline operation tool is used to sequentially lower the reverse circulation jet pump core and the Y-joint isolation sleeve, which are then placed in the circulation sliding sleeve and the landing joint, respectively. The wireline equipment is then pulled out and the wellhead is restored.

[0026] S3, Reverse injection wellhead process: Open the left wing valve of the four-way valve and the right wing valve of the Christmas tree, and close the upper valve of the Christmas tree, the left wing valve of the Christmas tree, and the right wing valve of the four-way valve.

[0027] S4. Reverse injection of 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 mixture enters the second fluid channel and then reaches the wellhead. After reaching the wellhead, the mixture enters the production process through the first outlet pipeline for the next step of oil and water treatment. This completes the reverse injection of power fluid production.

[0028] This application has the following beneficial effects.

[0029] (1) The present invention has high operational efficiency, and the installation of downhole tools can be completed quickly using only wire rope operations;

[0030] (2) The present invention has low operating costs. It can restore production of faulty wells without the need for workover rigs or drilling vessels to perform moving tubing operations, which greatly reduces operating costs.

[0031] (3) This invention can effectively reduce crude oil loss. This system and method can enable rapid recovery of production during the gap between well failure and well workover. This system can quickly restore oil well production by using a jet pump to replace the well after an electric pump well failure through various methods. Attached Figure Description

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

[0033] Figure 2 This is a schematic diagram of the system for production using a jet pump after the electric pump fails, according to the present invention.

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

[0035] Figure 4 This is an enlarged schematic diagram of the sliding sleeve when the electric pump fails and a jet pump is used for production.

[0036] Among them, 1. Water injection pump; 2. First inlet pipeline; 21. First valve; 3. Second inlet pipeline; 31. Second valve; 4. Christmas tree; 41. Left wing valve of Christmas tree; 42. Right wing valve of Christmas tree; 43. Upper valve of Christmas tree; 5. Wellhead four-way connector; 51. Tubing hanger; 52. Left wing valve of four-way connector; 53. Right wing valve of four-way connector; 6. First outlet pipeline; 7. Second outlet pipeline; 8. Casing string assembly; 9. Tubing string assembly; 91. Y-joint; 92. Electric pump unit; 93. Location joint; 931. Location shoulder; 9 4. Circulating sleeve; 941. Sleeve outlet; 942. Locking groove; 97. Packer; 98. Oil pipe; 10. Y-joint isolation sleeve; 101. Isolation sleeve retrieval head; 102. Isolation sleeve outlet; 103. Upper seal of isolation sleeve; 104. Lower seal of isolation sleeve; 11. Jet pump core; 111. Jet pump retrieval head; 112. Upper seal of jet pump; 113. Mixed liquid outlet of jet pump; 114. Lower seal of jet pump; 12. First fluid channel; 13. Second fluid channel; 14. Third fluid channel; 15. Y-plug. Detailed Implementation

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

[0038] Figure 1 A schematic diagram of the structure of an electric pump well during normal production is shown. (Combined with...) Figure 1As shown, a tubing string assembly 9 is installed in the oil well. From bottom to top, the 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 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 four-way 5 and sets the packer 97. A Y-plug 15 is inserted into the landing joint 93 via wireline work. The landing joint 93 is separated into two independent parts by the Y-plug 15. A treehouse 4 is installed above the wellhead four-way 5 and connected to the surface equipment. The surface equipment includes a water injection pump 1, a first inlet line 2, a second inlet line 3, a first outlet line 6, and a second outlet line 7. The first outlet line 6 and the second outlet line 7 are connected to the production process. The produced fluid enters the oil and gas processing system for oil-water separation through the production process. The water injection pump 1, the first inlet pipeline 2, and the second inlet pipeline 3 are connected in sequence. The first inlet pipeline 2 and the second inlet pipeline 3 are respectively equipped with a first valve 21 and a second valve 31. The wellhead 4 includes a left wing valve 41, a right wing valve 42, and an upper valve 43. The wellhead four-way valve 5 includes a left wing valve 52 and a left wing valve 53. The first inlet pipeline 2 is connected to the left wing valve 52. One end of the second inlet pipeline 3 is connected to the first valve 21 and the left wing valve 52, and the other end is connected to the left wing valve 41 of the wellhead.

[0039] Reverse the production process: close the four-way left wing valve 52, four-way left wing valve 53, upper tree valve 43, and left wing valve 41; open the right wing valve 42. Open the circulating sleeve 94 and start the pump. Formation crude oil enters the first fluid channel 12, which is composed of the tubing string assembly 9 and the packer 97, through the third fluid channel 14 and the circulating sleeve 94. Then, it enters the second fluid channel 13 through the electric pump unit 92, and finally enters the production process through the right wing valve 42 of the tree.

[0040] When the electric pump unit 92 malfunctions, the oil well will cease production. Figure 2This diagram illustrates a production structure where a jet pump replaces an electric submersible pump using the original tubing string structure. The circulating sleeve 94 is opened for well flushing, replacing the crude oil in the first fluid channel 12 and the second fluid channel 13 with production water. After flushing, the Y-plug 15 is retrieved using a wireline, releasing the isolation at the joint 93. The jet pump core 11 is then inserted using a wireline. The bottom of the jet pump core 11 has a locking core that engages with the locking groove 942, securing the jet pump core 11 inside the circulating sleeve 94. The jet pump core 11 also includes a jet pump retrieval head 111, a jet pump upper seal 112, a jet pump lower seal 114, and a jet pump mixture outlet 113. The jet pump mixture outlet 113 is located between the jet pump upper seal 112 and the jet pump lower seal 114 and communicates with the sleeve outlet 941. The jet pump core 11 can be a forward circulation pump core or a reverse circulation pump core. Continue using wire rope to lower the Y-joint isolation sleeve 10 to the landing joint 93. The Y-joint isolation sleeve 10 includes an isolation sleeve retrieval head 101, an isolation sleeve outlet 102, an upper isolation sleeve seal 103, and a lower isolation sleeve seal 104. There are 2-3 outlets 102, evenly distributed. The upper isolation sleeve seal 103 is an O-ring seal, and the lower isolation sleeve seal 104 is a V-type packing seal. Both the upper seal 112 and the lower seal 114 of the jet pump are O-ring seals.

[0041] In practical use, a jet pump replacement electric submersible pump production system according to an embodiment of the present invention may include the following two methods:

[0042] The first method involves direct injection of power fluid for production, where power fluid is injected into the tubing assembly 9. The jet pump core 11, which is used in conjunction with the direct injection power fluid production, is a positive circulation pump core. The reverse injection wellhead process involves closing the left wing valve 52 of the four-way valve, the upper valve 43 of the Christmas tree, and the right wing valve 42 of the Christmas tree, and opening the left wing valve 41 of the Christmas tree and the right wing valve 53 of the four-way valve. The first valve 21 and the second valve 31 are opened, and the water injection pump 1 is started to inject power fluid. The power fluid flows along the surface flow path into the second fluid channel 13 and mixes with the formation crude oil in the third fluid channel 14 within the positive circulation jet pump core 11. The mixture flows out from the jet pump's mixture outlet 113, passes through the sliding sleeve outlet 941, enters the first fluid channel 12, and reaches the wellhead. After reaching the wellhead, the mixture passes through the second outlet pipeline 7 and enters the production process for the next step of oil-water treatment, thus completing the direct injection power fluid production.

[0043] The second method involves reverse injection of power fluid for production. Power fluid is injected into the first fluid channel 12, and the jet pump core 11 used in conjunction with this reverse injection is a reverse circulation pump core. The reverse injection wellhead process is as follows: open the left wing valve 52 of the four-way valve and the right wing valve 42 of the Christmas tree; close the upper valve 43 of the Christmas tree, the left wing valve 41 of the Christmas tree, and the right wing valve 53 of the four-way valve; open the first valve 21 and close the second valve 31; start the water injection pump 1 to inject the power fluid. The power fluid flows along the surface process into the first fluid channel 12 and mixes with the formation crude oil in the third fluid channel 14 within the reverse circulation jet pump core 11. The mixture then enters the second fluid channel 13 and reaches the wellhead. After reaching the wellhead, the mixture enters the production process through the first outlet pipeline 6 for the next step of oil-water treatment, thus completing the reverse injection of power fluid production.

[0044] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A jet pump replacing an electric submersible pump production system, characterized in that: This includes surface equipment, wellhead equipment, downhole tubing assemblies, and replacement lifting tools; The downhole tubing assembly includes a casing assembly (8) and a tubing assembly (9); the tubing assembly (9) includes, from top to bottom, a tubing hanger (51), tubing (98), a Y-joint (91), a landing joint (93), an electric pump unit (92), a circulating sleeve (94), and a packer (97); the casing assembly (8), the tubing assembly (9), and the packer (97) form a first fluid channel (12); the tubing assembly (9) above the circulating sleeve (94) forms a second fluid channel (13); the tubing assembly (9) below the circulating sleeve (94) forms a third fluid channel (14); the landing joint (93) is provided with a landing shoulder (931); the circulating sleeve (94) is provided with a sleeve outlet (941) and a locking groove (942). The replacement lifting tool includes a Y-connector isolation sleeve (10) and a jet pump core (11); the Y-connector isolation sleeve (10) is placed on the sitting shoulder (931) and includes an isolation sleeve retrieval head (101), an isolation sleeve outlet (102), an upper isolation sleeve seal (103), and a lower isolation sleeve seal (104); the jet pump core (11) is a positive circulation pump core or a reverse circulation pump core; the jet pump core (11) includes a jet pump retrieval head (111), a 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 communicates with the sliding sleeve outlet (941); the bottom of the jet pump core (11) is provided with a lock core that cooperates with the locking groove (942); The ground device includes 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 the 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 equipped with a first valve (21) and a second valve (31). The wellhead assembly includes a tree (4) and a four-way valve (5). The tree (4) includes a left wing valve (41), a right wing valve (42), and an upper valve (43). The four-way valve (5) includes a left wing valve (52) and a right wing valve (53). The first inlet line (2) is connected to the left wing valve (52). One end of the second inlet line (3) is connected to the first valve (21) and the left wing valve (52), and the other end is connected to the left wing valve (41). The first outlet line (6) is connected to the right wing valve (42). The second outlet line (7) is connected to the right wing valve (53).

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

3. The jet pump replacement electric submersible pump production system according to claim 1, characterized in that: The isolation sleeve has 2-3 liquid outlets (102) that are distributed at equal angles.

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

5. A jet pump replacing an electric submersible pump production system according to claim 1, characterized in that: The packer (97) is either an insert type or a compression type.

6. A jet pump replacement electric submersible pump production system according to claim 1, characterized in that: The switching method of the circulating sleeve (94) is a mechanical switch or a hydraulic control switch.

7. 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 1-6, production is carried out using positive injection kinetic fluid, and the steps are as follows: S1. Open the circulating sleeve (94) to flush the well and replace the crude oil in the first fluid channel (12) and the second fluid channel (13) with production water; S2. The wire rope cutting tool is used to sequentially cut the positive circulation jet pump core (11) and the Y-joint isolation sleeve (10) into the circulation sliding sleeve (94) and the landing joint (93) respectively, and then the wire rope equipment is pulled out and the wellhead is restored. S3, reverse injection wellhead process: close the four-way left wing valve (52), the upper valve of the tree (43) and the right wing valve of the tree (42), and open the left wing valve of the tree (41) and the four-way right wing valve (53). S4. Resume production of positive injection power fluid, 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 mixture flows out from the jet pump mixture outlet (113) and enters the first fluid channel (12) through the sliding sleeve outlet (941) to reach the wellhead, the mixture enters the production process through the second outlet pipeline (7) for the next step of oil and water treatment, and the positive injection power fluid production is completed.

8. 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 1-6, production is carried out using back-injection kinetic fluid, with the following steps: S1. Open the circulating sleeve (94) to flush the well and replace the crude oil in the first fluid channel (12) and the second fluid channel (13) with production water; S2. The wire rope operation tool is used to sequentially lower the reverse circulation jet pump core (11) and the Y-joint isolation sleeve (10) into the circulation sliding sleeve (94) and the landing joint (93) respectively, and then the wire rope equipment is pulled out and the wellhead is restored. S3, Reverse injection wellhead process: Open the left wing valve (52) of the four-way valve and the right wing valve (42) of the tree, and close the upper valve (43) of the tree, the left wing valve (41) of the tree and the right wing valve (53) of the four-way valve. S4. Resume production by injecting reverse power fluid, 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 pump core (11) of the reverse circulation jet pump, the mixture enters the second fluid channel (13) and then reaches the wellhead, the mixture enters the production process through the first liquid outlet pipeline (6) after reaching the wellhead, and the next step of oil and water treatment is carried out. The production of reverse power fluid is thus completed.

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