Wellhead suspended centrifugal pump driven dual-tube jet flow drainage device and use method

Abstract

The present application relates to oil and gas field and coal bed gas field exploitation equipment technical field, especially relates to a kind of wellhead suspension centrifugal pump drive double-tube jet flow drainage device and use method.The technical scheme is: in bottom flange, lower tubing head four-way, middle tubing head four-way and upper tubing head four-way are installed in sequence, motor is installed in the upper portion of upper tubing head four-way, the lower end of submersible water injection centrifugal pump is installed inner tube plug-in pump core catcher, the lower end of guide pipe is connected with outer tubing, the lower end of inner tube plug-in pump core catcher is movably connected with inner tubing, and the pump core installed in double-tube jet flow pump sits inside jet flow pump cylinder.The beneficial effect is: since the packer is omitted, and double-tube jet flow pump is connected, not only can the sand-containing liquid under well be pumped, but also the exploitation of natural gas or coal bed gas can be realized;Pump core is captured by the elastic jaw of inner tube plug-in pump core catcher;Then by lifting motor at ground wellhead, submersible water injection centrifugal pump and pump core can be lifted to ground at one time, which is convenient for maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas field and coalbed methane field exploitation equipment, in particular to a wellhead suspended centrifugal pump driven double-tube jet flow drainage device and a use method thereof. BACKGROUND

[0002] At present, in the oil exploitation technology, the downhole jet flow drainage technology has great advantages for liquid containing sand, gas and other complex components. Compared with the commonly used plunger pump driven by a multistage centrifugal pump, the multistage centrifugal pump driven has the advantages of small floor area, low noise, less maintenance workload and easy to realize automatic control. However, the existing ground plunger pump driven single-tube jet flow pump drainage cannot meet the needs of monitoring the dynamic liquid level of oil and gas wells, and the existing concentric double-tube jet flow pump is limited due to high noise of the driving plunger pump, complex ground system, large management and maintenance workload, and difficulty in realizing unattended operation.

[0003] The present application relates to the technical field of oil and gas field and coalbed methane field exploitation equipment, in particular to a wellhead suspended centrifugal pump driven double-tube jet flow drainage device and a use method thereof. SUMMARY

[0004] The wellhead suspension centrifugal pump driven double-tube jet flow drainage device and use method aim at the above-mentioned defects in the prior art, remove the packer, and use the double-tube structure jet flow pump, so that not only the sand-containing liquid can be pumped, but also the gas production function can be realized; in addition, the inner tube plug-in pump core catcher is adopted, so that the pump core can be quickly captured, the time consumption is short, the maintenance is convenient, and the small-diameter and small-displacement pump core is not needed to cooperate with the hollow shaft motor, hollow shaft coupling, hollow shaft centrifugal electric pump and the like.

[0005] The wellhead suspension centrifugal pump driven double-tube jet flow drainage device provided by the application has the technical scheme that the device comprises a motor, a motor support, a shaft coupling, a bottom flange, a submersible water injection centrifugal pump, the motor is installed on the motor support, the output end of the motor is connected to the submersible water injection centrifugal pump through the shaft coupling, and the device further comprises an upper oil pipe head four-way joint, a middle oil pipe head four-way joint, a lower oil pipe head four-way joint, a guide pipe, an inner tube plug-in pump core catcher, an outer oil pipe, an inner oil pipe, a double-tube jet flow pump and a check valve, the lower oil pipe head four-way joint, the middle oil pipe head four-way joint and the upper oil pipe head four-way joint are sequentially installed on the bottom flange, the motor support is installed on the upper part of the upper oil pipe head four-way joint, the outer side of the upper oil pipe head four-way joint is provided with a power liquid inlet, the outer side of the middle oil pipe head four-way joint is provided with a mixed liquid outlet, and the outer side of the lower oil pipe head four-way joint is provided with a gas production outlet; the lower end of the submersible water injection centrifugal pump is provided with the inner tube plug-in pump core catcher, the outer part of the submersible water injection centrifugal pump is provided with the guide pipe, the upper end of the guide pipe is installed on the guide pipe joint in the inner cavity of the lower oil pipe head four-way joint, and the lower end is connected with the outer oil pipe, the lower end of the inner tube plug-in pump core catcher is movably connected with the inner oil pipe, the inner oil pipe is installed in the inner cavity of the outer oil pipe, the lower end of the outer oil pipe is connected with the upper end outer joint of the double-tube jet flow pump, the lower end of the inner oil pipe is connected with the upper end inner joint of the double-tube jet flow pump, the check valve is installed at the lower end of the double-tube jet flow pump, the pump core installed in the double-tube jet flow pump is seated in the jet flow pump cylinder, and the outer diameter of the pump core is smaller than the inner diameter of the inner oil pipe.

[0006] Preferably, a plurality of centralizers are installed between the inner oil pipe and the outer oil pipe.

[0007] Preferably, the upper end of the submersible water injection centrifugal pump is installed on the inner wall of the middle oil pipe head four-way joint through a submersible electric pump joint, a power connection shaft is arranged at the upper end of the submersible water injection centrifugal pump, the power connection shaft is connected with an extension shaft through a pump protection shaft coupling, and a power liquid inlet channel is arranged between the submersible electric pump joint and the power connection shaft.

[0008] Preferably, the aforementioned inner tube insertion pump core catcher includes a catcher assembly, elastic claws, a catcher upper connector, a catcher cavity, and an inner tube insertion connector. The catcher assembly has an upper connector at its upper end and an inner tube insertion connector at its lower end. The catcher assembly has a catcher cavity in its middle. A connecting hole is provided between the catcher cavity and the catcher upper connector. An elastic claw body is threadedly connected to the upper part of the catcher cavity. Multiple sets of elastic claws are provided at the lower part of the elastic claw body.

[0009] Preferably, the above-mentioned elastic claws are provided in six sets, and each set of elastic claws has multiple sets of inner protrusions at the lower end for connecting with the retrieval head at the top of the pump core of the dual-tube jet pump.

[0010] Preferably, the inner tube connector is connected to the upper end of the inner oil pipe, and the outer diameter of the inner tube connector is smaller than the inner diameter of the inner oil pipe. Multiple sealing rings are provided on the inner tube connector, and the upper connector of the catcher is connected to the submersible electric pump connecting pipe.

[0011] Preferably, the above-mentioned dual-tube jet pump includes a jet pump barrel, a pump core, a lower connector of the pump barrel, a mixed liquid discharge channel, an upper inner connector, an upper outer connector, a formation fluid inlet, and a pump core support seat. The top of the jet pump barrel is provided with an upper outer connector, and the bottom of the pump barrel is provided with a lower connector. The inner cavity of the jet pump barrel is provided with an inner cylinder, and a mixed liquid discharge channel is formed between the inner cylinder and the inner wall of the jet pump barrel. An inner connector seat is installed on the upper inner wall of the inner cylinder. The lower end of the inner cylinder is fixedly connected to the lower part of the jet pump barrel. A pump core support seat is provided in the lower part of the inner cavity of the jet pump barrel. A formation fluid inlet is provided between the pump core support seat and the inner cylinder. The pump core is seated on the pump core support seat, and the upper outer wall of the pump core contacts and engages with the inner wall of the inner connector seat.

[0012] Preferably, the pump core is provided with a retrieval head at the top and a pump core power fluid inlet at the lower side of the retrieval head. A nozzle, a throat, and a diffusion chamber are provided sequentially from top to bottom in the inner cavity of the pump core. The mixing chamber formed between the nozzle and the throat is connected to the formation fluid inlet, and the lower outlet of the diffusion chamber is connected to the mixing fluid discharge channel.

[0013] Preferably, the aforementioned conduit connector forms a mixed liquid annular channel between itself and the outer wall of the submersible water injection centrifugal pump.

[0014] The method of using the wellhead suspended centrifugal pump driven dual-tube jet drainage device mentioned in this invention includes the following process:

[0015] 1. During deep well oil extraction, open the upper and middle tubing head four-way valves and close the lower tubing head four-way valve. Inject power fluid through the power fluid inlet of the upper tubing head four-way valve. The power fluid enters the submersible water injection centrifugal pump along the power fluid inlet channel. After being pressurized by the submersible water injection centrifugal pump, the power fluid enters the inner tube insertion pump core catcher along the submersible electric pump connecting pipe. Then, it enters the inner tubing through the connecting hole, the catch chamber, and the inner tube insertion joint of the inner tube insertion pump core catcher, and then enters the inner tubing. Finally, it is sent into the double tubing. The power fluid inlet of the upper pump core of the jet pump is sprayed through the nozzle into the throat. Under negative pressure, the formation fluid is driven to enter the mixing chamber along the formation fluid inlet and mix with the power fluid. Then, the mixture flows downward along the diffusion chamber and is discharged from the dual-tube jet pump through the mixture discharge channel. Then, the mixture is discharged upward along the annulus between the inner and outer tubing. It passes through the annulus between the inner tube insertion pump core catcher and the guide tube and is discharged upward through the mixture outlet of the four-way valve at the middle tubing head to the surface, thus realizing the extraction of deep well oil.

[0016] 2. When extracting natural gas or coalbed methane, open the lower oil pipe head four-way valve, close the upper oil pipe head four-way valve and the middle oil pipe head four-way valve, and the natural gas or coalbed methane will be discharged upward along the oil layer, discharged upward through the annulus between the outer oil pipe and the casing, until the natural gas or coalbed methane is discharged through the gas production outlet of the lower oil pipe head four-way valve, thus realizing the extraction of natural gas or coalbed methane.

[0017] 3. When a well needs maintenance, open the upper and middle tubing head tee and close the lower tubing head tee. Inject reverse circulation fluid into the mixed fluid outlet of the middle tubing head tee. The reverse circulation fluid flows down along the annulus between the guide pipe joint and the guide pipe into the annulus between the guide pipe and the inner tube insertion pump core catcher. It then continues down along the annulus between the outer and inner tubing into the mixed fluid discharge channel of the dual-tube jet pump. Under pressure, it pushes the pump core away from the pump core support seat. Then, under pressure, the pump core flows up along the inner tubing into the capture chamber of the inner tube insertion pump core catcher and is captured and fixed by the elastic claws. Since the lower end of the inner tube insertion pump core catcher is inserted into the inner tubing through the inner tube insertion joint, remove the bolts on the bottom flange. Lift the motor, upper tubing head tee, middle tubing head tee, and lower tubing head tee at the wellhead on the ground to bring the submersible water injection centrifugal pump and pump core to the surface for maintenance.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] I. This invention uses a multi-stage submersible water injection centrifugal pump suspended at the wellhead as the driving source of the power fluid to drive the downhole dual-tube jet pump for drainage. Its surface process is simple, saves well site area, has low noise, low maintenance cost, and is easy to automate. In addition, since it eliminates the packer and replaces the downhole jet pump with a dual-tube jet pump, it can not only pump sand-containing liquids downhole, but also realize the extraction of natural gas or coalbed methane, thus increasing the function of producing natural gas or coalbed methane.

[0020] II. This invention connects an inner tube plug-in pump core catcher to the lower end of the submersible water injection centrifugal pump. When the pump core of the dual-tube jet pump needs to be repaired or replaced, reverse circulation liquid is injected into the mixed liquid outlet of the four-way connector at the wellhead. The reverse circulation liquid pushes the pump core upward to the inner tube plug-in pump core catcher, where the retrieval head at the top of the pump core is caught by the elastic claws. Then, since the lower end of the inner tube plug-in pump core catcher is connected to the inner tubing by an inner tube plug-in connector, the submersible water injection centrifugal pump and pump core can be lifted to the surface in one go by hoisting the motor at the wellhead. This facilitates the repair and replacement of the pump core, saves construction time and costs, and avoids the problems associated with existing technologies. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a connection diagram of the inner tube inserting into the pump core catcher;

[0023] Figure 3 This is a three-dimensional structural diagram of the pump core catcher with an inner tube insertion;

[0024] Figure 4 This is a schematic diagram of a dual-tube jet pump;

[0025] In the diagram: 1. Motor; 2. Motor bracket; 3. Power fluid inlet; 4. Pump protection coupling; 5. Mixed liquid outlet; 6. Upper oil pipe head four-way; 7. Power fluid inlet channel; 8. Middle oil pipe head four-way; 9. Mixed liquid annular channel; 10. Lower oil pipe head four-way; 11. Gas outlet; 12. Bottom flange; 13. Submersible water injection centrifugal pump; 14. Pipe; 15. Sleeve; 16. Inner pipe plug-in pump core catcher; 17. Outer oil pipe; 18. Inner oil pipe; 19. Centralizer; 20. Submersible electric pump connecting pipe; 21. Double-pipe jet pump; 22. Check valve; 23. Submersible electric pump connector; 24. Pipe connector; 25. Extension shaft 1.1; Power connection shaft 14.1.

[0026] 17.1 Snapper assembly, 17.2 Elastic claw, 17.3 Snapper upper connector, 17.4 Snapper chamber, 17.5 Inner tube connector, 17.6 Elastic claw body, 17.7 Connecting hole;

[0027] Jet pump barrel 22.1, pump core 22.2, retrieval head 22.3, nozzle 22.4, throat 22.5, diffuser chamber 22.6, pump barrel lower connector 22.7, mixed liquid discharge channel 22.8, pump core power fluid inlet 22.9, upper inner connector 22.10, upper outer connector 22.11, formation fluid inlet 22.12, pump core support seat 22.13, inner cylinder 22.14, inner connector seat 22.15. Detailed Implementation

[0028] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0029] Example 1, referring to Figures 1-4 The present invention discloses a wellhead suspended centrifugal pump-driven dual-tube jet drainage device, comprising a motor 1, a motor bracket 2, a coupling 3, a bottom flange 13, and a submersible water injection centrifugal pump 14. The motor 1 is mounted on the motor bracket 2, and the output end of the motor 1 is connected to the submersible water injection centrifugal pump 14 via the coupling 3. The device also includes an upper oil pipe head four-way 7, a middle oil pipe head four-way 9, a lower oil pipe head four-way 11, a guide tube 15, an inner tube insertion pump core catcher 17, an outer oil pipe 18, an inner oil pipe 19, a dual-tube jet pump 22, and a check valve 23. The lower oil pipe head four-way 11, the middle oil pipe head four-way 9, and the upper oil pipe head four-way 7 are sequentially mounted on the bottom flange 13. The motor bracket 2 is mounted on the upper part of the upper oil pipe head four-way 7. A power fluid inlet 4 is provided on the outside of the upper oil pipe head four-way 7, a mixed fluid outlet 6 is provided on the outside of the middle oil pipe head four-way 9, and a... There is a gas outlet 12; the lower end of the submersible water-injection centrifugal pump 14 is equipped with an inner tube plug-in pump core catcher 17, and the outer side of the submersible water-injection centrifugal pump 14 is equipped with a conduit 15. The upper end of the conduit 15 is installed on the conduit connector 25 in the inner cavity of the lower oil pipe head four-way 11, and the lower end is connected to the outer oil pipe 18. The lower end of the inner tube plug-in pump core catcher 17 is movably connected to the inner oil pipe 19, and the inner oil pipe 19 is installed on the outer oil pipe 18. The inner cavity is 8, and the lower end of the outer oil pipe 18 is connected to the upper end external connector 22.11 of the double-pipe jet pump 22. The lower end of the inner oil pipe 19 is connected to the upper end internal connector 22.10 of the double-pipe jet pump 22. A single-flow valve 23 is installed at the lower end of the double-pipe jet pump 22. The pump core 22.2 installed inside the double-pipe jet pump 22 sits inside the jet pump barrel 22.1, and the outer diameter of the pump core 22.2 is smaller than the inner diameter of the inner oil pipe 19.

[0030] In this process, one or more centralizers 20 are installed between the inner oil pipe 19 and the outer oil pipe 18, which can play a role in straightening the inner oil pipe 19 and keeping it in the middle of the outer oil pipe 18.

[0031] In addition, the upper end of the aforementioned submersible water injection centrifugal pump 14 is installed on the inner wall of the intermediate oil pipe head four-way 9 through the submersible electric pump connector 24, and a power connection shaft 14.1 is provided at the upper end of the submersible water injection centrifugal pump 14. The power connection shaft 14.1 is connected to the extension shaft 1.1 through the pump protection coupling 5, and a power fluid inlet channel 8 is provided between the submersible electric pump connector 24 and the power connection shaft 14.1.

[0032] Reference Figure 2 and Figure 3 The inner tube insertion pump core catcher 17 mentioned in this invention includes a catcher assembly 17.1, elastic claws 17.2, a catcher upper connector 17.3, a catch chamber 17.4, and an inner tube insertion connector 17.5. The catcher assembly 17.1 has a catcher upper connector 17.3 at its upper end and an inner tube insertion connector 17.5 at its lower end. The catch chamber 17.4 is located in the middle of the catcher assembly 17.1. A connecting hole 17.7 is provided between the catch chamber 17.4 and the catcher upper connector 17.3. An elastic claw body 17.6 is threadedly connected to the upper part of the catch chamber 17.4. Multiple sets of elastic claws 17.2 are provided at the lower part of the elastic claw body 17.6. Each set of elastic claws 17.2 has multiple sets of inner protrusions at its lower end, which are used to cooperate and connect with the retrieval head 22.3 on the top of the pump core 22.2 of the dual-tube jet pump 22.

[0033] In addition, the aforementioned inner tube connector 17.5 is inserted and connected to the upper end of the inner oil pipe 19, and the outer diameter of the inner tube connector 17.5 is smaller than the inner diameter of the inner oil pipe 19. Multiple sealing rings are provided on the inner tube connector 17.5 to connect to the lower inner oil pipe 19. The upper connector 17.3 of the catcher is connected to the submersible electric pump connecting pipe 21, so that when the motor 1, the submersible water injection centrifugal pump 14, and the pump core 22.2 are pulled out, the inner tube connector 17.5 can be smoothly disengaged from the inner oil pipe 19.

[0034] Reference Figure 4The dual-tube jet pump 22 mentioned in this invention includes a jet pump barrel 22.1, a pump core 22.2, a lower connector 22.7, a mixed liquid discharge channel 22.8, an upper inner connector 22.10, an upper outer connector 22.11, a formation fluid inlet 22.12, and a pump core support 22.13. The upper outer connector 22.11 is located at the top of the jet pump barrel 22.1, and the lower connector 22.7 is located at the bottom. An inner cylinder 22.14 is located within the inner cavity of the jet pump barrel 22.1. The inner cylinder 22.14 is connected to the inner cavity of the jet pump barrel 22.1. A mixed liquid discharge channel 22.8 is formed between the walls. An inner connector seat 22.15 is installed on the upper inner wall of the inner cylinder 22.14. The lower end of the inner cylinder 22.14 is fixedly connected to the lower part of the jet pump cylinder 22.1. A pump core support seat 22.13 is provided in the lower part of the inner cavity of the jet pump cylinder 22.1. A formation fluid inlet 22.12 is provided between the pump core support seat 22.13 and the inner cylinder 22.14. A pump core 22.2 is seated on the pump core support seat 22.13. The upper outer wall of the pump core 22.2 contacts and engages with the inner wall of the inner connector seat 22.15.

[0035] The pump core 22.2 is provided with a retrieval head 22.3 at the top and a pump core power fluid inlet 22.9 at the lower side of the retrieval head 22.3. In the inner cavity of the pump core 22.2, a nozzle 22.4, a throat 22.5, and a diffusion chamber 22.6 are arranged sequentially from top to bottom. The mixing chamber formed between the nozzle 22.4 and the throat 22.5 is connected to the formation fluid inlet 22.12, and the lower outlet of the diffusion chamber 22.6 is connected to the mixed liquid discharge channel 22.8.

[0036] In addition, a mixed liquid annular channel 10 is formed between the aforementioned conduit connector 25 and the outer wall of the submersible water injection centrifugal pump 14.

[0037] The method of using the wellhead suspended centrifugal pump driven dual-tube jet drainage device mentioned in this invention includes the following process:

[0038] 1. During deep well oil extraction, open the upper oil pipe head tee 7 and the middle oil pipe head tee 9, and close the lower oil pipe head tee 11. Inject power fluid through the power fluid inlet 4 of the upper oil pipe head tee 7. The power fluid enters the submersible water injection centrifugal pump 14 along the power fluid inlet channel 8. After being pressurized by the submersible water injection centrifugal pump 14, the power fluid enters the inner tube insertion pump core catcher 17 along the submersible electric pump connecting pipe 21, then along the connecting hole 17.7, the catch chamber 17.4, and the inner tube insertion joint 17.5 inside the inner tube insertion pump core catcher 17, and then enters the inner layer oil pipe 19, and then is sent to the dual-tube jet pump 2. The pump core power fluid inlet 22.9 at the top of 2 is sprayed through nozzle 22.4 to throat 22.5. Under negative pressure, it drives the formation fluid along formation fluid inlet 22.12 into the mixing chamber and mixes with the power fluid. Then, the mixture flows down along diffuser 22.6 and is discharged through mixture discharge channel 22.8 to the dual-tube jet pump 22. Then, the mixture is discharged upward along the annulus between inner tubing 19 and outer tubing 18. It passes through the annulus between inner tube insertion pump core catcher 17 and guide tube 15 and is discharged upward through the mixture outlet 6 of middle tubing head four-way 9 to the surface, thus realizing the extraction of deep well oil.

[0039] 2. When extracting natural gas or coalbed methane, open the lower oil pipe head four-way 11, close the upper oil pipe head four-way 7 and the middle oil pipe head four-way 9, and the natural gas or coalbed methane will be discharged upward along the oil layer, and discharged upward through the annulus between the outer oil pipe 18 and the casing 16, until the natural gas or coalbed methane is discharged through the gas production outlet 12 of the lower oil pipe head four-way 11, thus realizing the extraction of natural gas or coalbed methane.

[0040] 3. When the well needs maintenance, open the upper tubing head tee 7 and the middle tubing head tee 9, and close the lower tubing head tee 11. Inject reverse circulation fluid into the mixed fluid outlet 6 of the middle tubing head tee 9. The reverse circulation fluid flows down along the annulus between the guide pipe joint 25 and the guide pipe 15 into the annulus between the guide pipe 15 and the inner pipe insertion pump core catcher 17, and then continues down along the annulus between the outer tubing 18 and the inner tubing 19 into the mixed fluid discharge channel 22.8 of the dual-tube jet pump 22. Under pressure, the pump core 22.2 is pushed away from the pump core support seat 22. 13. Then, under pressure, the pump core 22.2 moves upward along the inner tubing 19 into the capture chamber 17.4 of the inner tube insertion pump core catcher 17 and is captured and fixed by the elastic claw 17.2. Since the lower end of the inner tube insertion pump core catcher 17 is inserted into the inner tubing 19 through the inner tube insertion joint 17.5, the bolts on the bottom flange 13 are removed, and the motor 1, the upper tubing head four-way 7, the middle tubing head four-way 9 and the lower tubing head four-way 11 are lifted from the wellhead on the ground to bring the submersible water injection centrifugal pump 14 and the pump core 22.2 to the ground for maintenance.

[0041] Example 2: A wellhead suspended centrifugal pump driven dual-tube jet drainage device mentioned in this invention includes a motor 1, a motor bracket 2, a coupling 3, a bottom flange 13, and a submersible water injection centrifugal pump 14. The motor 1 is mounted on the motor bracket 2, and the output end of the motor 1 is connected to the submersible water injection centrifugal pump 14 through the coupling 3. It also includes an upper oil pipe head four-way 7, a middle oil pipe head four-way 9, a lower oil pipe head four-way 11, a guide tube 15, an inner tube plug-in pump core catcher 17, an outer oil pipe 18, an inner oil pipe 19, a dual-tube jet pump 22, and a check valve 23. The lower oil pipe head four-way 11, the middle oil pipe head four-way 9, and the upper oil pipe head four-way 7 are sequentially mounted on the bottom flange 13. The motor bracket 2 is mounted on the upper oil pipe head four-way 7. A power fluid inlet 4 is provided on the outside of the upper oil pipe head four-way 7, and a mixed fluid outlet 6 is provided on the outside of the middle oil pipe head four-way 9. The lower oil pipe head four-way 11... A gas outlet 12 is provided on the side; an inner tube insertion pump core catcher 17 is installed at the lower end of the submersible water injection centrifugal pump 14, and a conduit 15 is installed on the outside of the submersible water injection centrifugal pump 14. The upper end of the conduit 15 is installed on the conduit connector 25 in the inner cavity of the lower oil pipe head four-way 11, and the lower end is connected to the outer oil pipe 18. The lower end of the inner tube insertion pump core catcher 17 is movably connected to the inner oil pipe 19, and the inner oil pipe 19 is installed on the outer oil pipe. The inner cavity is 18, and the lower end of the outer oil pipe 18 is connected to the upper end external connector 22.11 of the double-pipe jet pump 22. The lower end of the inner oil pipe 19 is connected to the upper end internal connector 22.10 of the double-pipe jet pump 22. A single-flow valve 23 is installed at the lower end of the double-pipe jet pump 22. The pump core 22.2 installed inside the double-pipe jet pump 22 sits inside the jet pump barrel 22.1, and the outer diameter of the pump core 22.2 is smaller than the inner diameter of the inner oil pipe 19.

[0042] The difference from Example 1 is:

[0043] The elastic claws 17.2 of this embodiment are provided in three, six or eight sets, and the lower end of each elastic claw 17.2 is provided with multiple sets of inner protrusions for connecting with the retrieval head 22.3 on the top of the pump core 22.2 of the dual-tube jet pump 22.

[0044] The above description is merely a partial preferred embodiment of the present invention. Any person skilled in the art can modify the above-described technical solutions or modify them into equivalent technical solutions. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A wellhead-mounted centrifugal pump-driven dual-tube jet drainage device, comprising a motor (1), a motor bracket (2), a coupling (3), a bottom flange (13), and a submersible water injection centrifugal pump (14), wherein the motor (1) is mounted on the motor bracket (2), and the output end of the motor (1) is connected to the submersible water injection centrifugal pump (14) through the coupling (3), characterized in that: It also includes an upper oil pipe head tee (7), a middle oil pipe head tee (9), a lower oil pipe head tee (11), a conduit (15), an inner pipe plug-in pump core catcher (17), an outer oil pipe (18), an inner oil pipe (19), a double-pipe jet pump (22), and a single-flow valve (23). The lower oil pipe head tee (11), the middle oil pipe head tee (9), and the upper oil pipe head tee (7) are installed sequentially on the bottom flange (13). A motor bracket (2) is installed on the upper part of the upper oil pipe head tee (7). A power fluid inlet (4) is provided on the outside of the upper oil pipe head tee (7), a mixed liquid outlet (6) is provided on the outside of the middle oil pipe head tee (9), and a gas outlet (12) is provided on the outside of the lower oil pipe head tee (11). The lower end of the submersible water injection centrifugal pump (14) is equipped with an inner pipe plug-in pump core catcher (17), and the outside of the submersible water injection centrifugal pump (14) is... Install the conduit (15), the upper end of which is installed on the conduit connector (25) inside the lower oil pipe head four-way (11), and the lower end is connected to the outer oil pipe (18). The lower end of the inner pipe insert pump core catcher (17) is movably connected to the inner oil pipe (19). The inner oil pipe (19) is installed inside the outer oil pipe (18), and the lower end of the outer oil pipe (18) is connected to the upper end of the double-pipe jet pump (22). The lower end of the inner oil pipe (19) is connected to the upper end of the double-pipe jet pump (22) via the external connector (22.11). A single-flow valve (23) is installed at the lower end of the double-pipe jet pump (22). The pump core (22.2) installed inside the double-pipe jet pump (22) sits inside the jet pump barrel (22.1), and the outer diameter of the pump core (22.2) is smaller than the inner diameter of the inner oil pipe (19). The inner tube insertion pump core catcher (17) includes a catcher assembly (17.1), elastic claws (17.2), a catcher upper connector (17.3), a catch chamber (17.4), and an inner tube insertion connector (17.5). The catcher assembly (17.1) has a catcher upper connector (17.3) at its upper end and an inner tube insertion connector (17.5) at its lower end. The catcher assembly (17.1) has a catch chamber (17.4) in the middle. A connecting hole (17.7) is provided between the catch chamber (17.4) and the catcher upper connector (17.3). An elastic claw body (17.6) is threadedly connected to the upper part of the catch chamber (17.4). Multiple sets of elastic claws (17.2) are provided at the lower part of the elastic claw body (17.6). The elastic claws (17.2) are provided in six sets, and each set of elastic claws (17.2) has multiple sets of inner protrusions at the lower end for connecting with the retrieval head (22.3) on the top of the pump core (22.2) of the dual-tube jet pump (22).

2. The wellhead suspended centrifugal pump driven dual-tube jet drainage device according to claim 1, characterized in that: One or more centralizers (20) are installed between the inner oil pipe (19) and the outer oil pipe (18).

3. The wellhead suspended centrifugal pump driven dual-tube jet drainage device according to claim 2, characterized in that: The upper end of the submersible water injection centrifugal pump (14) is installed on the inner wall of the oil pipe head four-way (9) through the submersible electric pump connector (24), and a power connection shaft (14.1) is provided at the upper end of the submersible water injection centrifugal pump (14). The power connection shaft (14.1) is connected to the extension shaft (1.1) through the pump protection coupling (5). A power fluid inlet channel (8) is provided between the submersible electric pump connector (24) and the power connection shaft (14.1).

4. The wellhead suspended centrifugal pump driven dual-tube jet drainage device according to claim 3, characterized in that: The inner tube connector (17.5) is connected to the upper end of the inner oil pipe (19), and the outer diameter of the inner tube connector (17.5) is smaller than the inner diameter of the inner oil pipe (19). Multiple sealing rings are provided on the inner tube connector (17.5). The upper connector (17.3) of the catcher is connected to the submersible electric pump connecting pipe (21).

5. The wellhead suspended centrifugal pump driven dual-tube jet drainage device according to claim 4, characterized in that: The dual-tube jet pump (22) includes a jet pump barrel (22.1), a pump core (22.2), a lower connector (22.7), a mixed liquid discharge channel (22.8), an upper inner connector (22.10), an upper outer connector (22.11), a formation fluid inlet (22.12), and a pump core support (22.13). The top of the jet pump barrel (22.1) is provided with an upper outer connector (22.11), and the lower end is provided with a lower connector (22.7). The inner cavity of the jet pump barrel (22.1) is provided with an inner cylinder (22.14), and the inner cylinder (22.14) is flush with the inner wall of the jet pump barrel (22.1). A mixed liquid discharge channel (22.8) is formed between them. An inner connector seat (22.15) is installed on the upper inner wall of the inner cylinder (22.14). The lower end of the inner cylinder (22.14) is fixedly connected to the lower part of the jet pump cylinder (22.1). A pump core support seat (22.13) is provided in the lower part of the inner cavity of the jet pump cylinder (22.1). A formation fluid inlet (22.12) is provided between the pump core support seat (22.13) and the inner cylinder (22.14). A pump core (22.2) is seated on the pump core support seat (22.13). The upper outer wall of the pump core (22.2) is in contact with the inner wall of the inner connector seat (22.15).

6. The wellhead suspended centrifugal pump driven dual-tube jet drainage device according to claim 5, characterized in that: The pump core (22.2) is provided with a retrieval head (22.3) at the top, and a pump core power fluid inlet (22.9) is provided on the lower side of the retrieval head (22.3). In the inner cavity of the pump core (22.2), a nozzle (22.4), a throat (22.5), and a diffusion chamber (22.6) are arranged sequentially from top to bottom. The mixing chamber formed between the nozzle (22.4) and the throat (22.5) is connected to the formation fluid inlet (22.12), and the lower outlet of the diffusion chamber (22.6) is connected to the mixed fluid discharge channel (22.8).

7. The wellhead-suspended centrifugal pump-driven dual-tube jet drainage device according to claim 6, characterized in that: The conduit connector (25) forms a mixed liquid annular channel (10) between the outer wall of the submersible water injection centrifugal pump (14).

8. A method of using the wellhead suspended centrifugal pump driven dual-tube jet drainage device as described in claim 7, characterized in that: Includes the following processes:

1. During deep well oil extraction, open the upper oil pipe head four-way (7) and the middle oil pipe head four-way (9), and close the lower oil pipe head four-way (11). Inject power fluid through the power fluid inlet (4) of the upper oil pipe head four-way (7). The power fluid enters the submersible water injection centrifugal pump (14) along the power fluid inlet channel (8). After being pressurized by the submersible water injection centrifugal pump (14), the power fluid enters the inner tube insertion pump core catcher (17) along the submersible electric pump connecting pipe (21). Then, it enters the inner tube insertion pump core catcher (17) along the connecting hole (17.7), the catch chamber (17.4), and the inner tube insertion joint (17.5) in the inner tube insertion pump core catcher (17), and then enters the inner layer oil pipe (19). Finally, it is sent to the double tube jet pump. The pump core power fluid inlet (22.9) at the top of (22) is sprayed through the nozzle (22.4) to the throat (22.5). Under the action of negative pressure, the formation fluid is driven to enter the mixing chamber along the formation fluid inlet (22.12) and mix with the power fluid. Then, the mixture flows down along the diffusion chamber (22.6) and is discharged from the double-tube jet pump (22) through the mixture discharge channel (22.8). Then, the mixture is discharged upward along the annulus between the inner oil pipe (19) and the outer oil pipe (18). It is discharged upward through the annulus between the inner tube plug-in pump core catcher (17) and the guide tube (15) and discharged to the surface through the mixture outlet (6) of the middle oil pipe head four-way (9), thus realizing the exploitation of deep well oil.

2. When extracting natural gas or coalbed methane, open the lower oil pipe head four-way (11), close the upper oil pipe head four-way (7) and the middle oil pipe head four-way (9), and the natural gas or coalbed methane will be discharged upward along the oil layer, and discharged upward through the annulus between the outer oil pipe (18) and the casing (16) until the natural gas or coalbed methane is discharged through the gas production outlet (12) of the lower oil pipe head four-way (11), thus realizing the extraction of natural gas or coalbed methane; 3. When the well needs maintenance, open the upper tubing head tee (7) and the middle tubing head tee (9), and close the lower tubing head tee (11). Inject reverse circulation fluid into the mixing outlet (6) of the middle tubing head tee (9). The reverse circulation fluid flows down along the annulus between the guide pipe joint (25) and the guide pipe (15) into the annulus between the guide pipe (15) and the inner pipe insertion pump core catcher (17). It then continues down along the annulus between the outer tubing (18) and the inner tubing (19) into the mixing discharge channel (22.8) of the dual-tube jet pump (22). Under pressure, it pushes the pump core (22.2) away from the pump core support seat (22.1). 3) Then, the pump core (22.2) enters the capture chamber (17.4) of the inner tube plug-in pump core catcher (17) under pressure and is captured and fixed by the elastic claw (17.2). Since the lower end of the inner tube plug-in pump core catcher (17) is plugged into the inner tube (19) through the inner tube plug joint (17.5), the bolts on the bottom flange (13) are removed, and the submersible water injection centrifugal pump (14) and pump core (22.2) are lifted to the ground by hoisting the motor (1), the upper oil pipe head four-way (7), the middle oil pipe head four-way (9) and the lower oil pipe head four-way (11) at the ground wellhead, and then the maintenance is carried out.

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