Gas-liquid mixed pumping oil pump with air chamber ring cavity

Abstract

The application relates to a gas-liquid mixed pumping oil pump with a gas chamber ring cavity, and belongs to the technical field of oil-gas field oil extraction equipment, which comprises a pump cylinder outer pipe assembly, a plunger assembly and a suction valve. The pump cylinder outer pipe assembly comprises an upper joint, a pump cylinder, an outer pipe and a lower joint, the upper part of the pump cylinder is provided with a communication port, the outer pipe is arranged outside the pump cylinder, the upper end and the lower end of the outer pipe are in sealing connection with the pump cylinder, and the pump cylinder and the outer pipe surround to form a closed gas chamber ring cavity. The plunger assembly can reciprocate along the pump cylinder in the axial direction, and the lower end of the plunger assembly is provided with a discharge valve. A turbulence component is further arranged on the outer wall of the pump cylinder. The pump cylinder and the outer pipe form the gas chamber ring cavity, the machining precision and the manufacturing cost are reduced, the gas chamber ring cavity opens up a replacement channel for the gas in the pump, the filling coefficient of the liquid in the pump cylinder is improved, and the oil extraction efficiency is improved. The turbulence component is arranged, the gas backflow is crushed into small bubbles, the free gas retention amount is reduced, and the negative influence of the gas on the pumping efficiency is further weakened.

Description

Technical Field

[0001] This invention relates to a gas-liquid mixed-extraction pump with a gas chamber annular cavity, belonging to the technical field of oil and gas field production equipment. Background Technology

[0002] In the process of oil and gas field development, oil production operations in wells with high gas-liquid ratios have always been a challenge in the industry. Under high gas-liquid ratio conditions, conventional oil pumps are prone to accumulating a large amount of gas inside the pump barrel, resulting in a significant decrease in the liquid filling coefficient. In severe cases, gas lock can occur, preventing the oil pump from producing oil normally and resulting in extremely low pump efficiency.

[0003] While some hollow air-proof pump structures exist in the existing technology, they mostly adopt a hollow pump cylinder design with upper and lower sections. During the manufacturing process, it is necessary to strictly ensure the coaxiality of the upper and lower pump cylinders. The manufacturing accuracy requirements are high, the assembly is difficult, and the manufacturing cost remains high, making it difficult to promote and apply on a large scale in the field. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a gas-liquid mixed pump with a gas chamber annular cavity, so as to solve the problems of high processing and assembly difficulty, low pump efficiency in high gas-liquid ratio oil wells, and easy occurrence of gas lock in the existing anti-gas pumps.

[0005] The gas-liquid mixed pump with an air chamber annular cavity of the present invention includes a pump barrel outer tube assembly A, a plunger assembly and a suction valve A; the pump barrel outer tube assembly A includes an upper connector A, a pump barrel A, an outer tube A and a lower connector A. A communication port A is opened at the upper part of the pump barrel A. The outer tube A is sleeved on the outside of the pump barrel A. The upper end of the outer tube A is sealed to the upper end of the pump barrel A through the upper connector A. The lower end of the outer tube A is sealed to the lower end of the pump barrel A through the lower connector A and the air chamber seal A. The outer wall of the pump barrel A and the inner wall of the outer tube A surround each other to form a closed air chamber annular cavity A. The plunger assembly is installed inside the pump barrel A and can reciprocate along the axial direction of the pump barrel A. The plunger assembly is in sealed contact with the inner wall of the pump barrel A. A discharge valve is provided at the lower end of the plunger assembly. The suction valve A is located below the pump barrel A. A flow turbulence component is also provided on the outer wall of the pump barrel A. The flow turbulence component is located above the communication port A.

[0006] Preferably, the plunger assembly includes a plunger body, which is a cylindrical structure with the upper and lower ends connected; a discharge valve is disposed at the lower end of the plunger body, and a booster is installed at the lower end of the discharge valve to assist the opening and closing action of the discharge valve.

[0007] Preferably, the suction valve A is installed on the lower inner side of the pump cylinder A to control the entry of the oil-gas mixture from outside the pump into the pump.

[0008] Preferably, the turbulence-disrupting component includes an inner steel plate and an elastic ring. The elastic ring is fixedly connected to the outer edge of the inner steel plate, and a plurality of slit return channels are arranged in a circumferential array on the inner steel plate. The elastic ring is in elastic contact with the outer tube A, and the gas can only enter the area above the turbulence-disrupting component by pushing open the elastic ring from bottom to top, or enter the area below the turbulence-disrupting component by passing through the slit return channels.

[0009] The gas-liquid mixed pump with an air chamber annular cavity of the present invention includes a pump barrel outer tube assembly B, a plunger assembly and a suction valve B; the pump barrel outer tube assembly B includes an upper connector B, a pump barrel B, an outer tube B and a lower connector B, the upper part of the pump barrel B has a communication port B, the outer tube B is sleeved on the outside of the pump barrel B, the upper end of the outer tube B is sealed to the upper end of the pump barrel B through the upper connector B and the air chamber seal B, and the lower end of the outer tube B is sealed to the lower end of the pump barrel B through the lower connector B, and the outer wall of the pump barrel B and the inner wall of the outer tube B surround to form a closed air chamber annular cavity B; The plunger assembly is installed inside the pump barrel B and can reciprocate along the pump barrel B axis. The plunger assembly is in sealed contact with the inner wall of the pump barrel B. A discharge valve is provided at the lower end of the plunger assembly. The suction valve B is located below the pump barrel B. A flow turbulence component is also provided on the outer wall of the pump barrel B, and the flow turbulence component is located above the communication port B.

[0010] Preferably, the suction valve B is installed inside the lower connector B.

[0011] The gas-liquid mixing pump with an air chamber annular cavity of the present invention includes a pump barrel outer tube assembly C, a plunger assembly and a suction valve C; the pump barrel outer tube assembly C includes an upper connector C, a pump barrel C, an outer tube C and a lower connector C, the upper part of the pump barrel C has a communication port C, the outer tube C is sleeved on the outside of the pump barrel C, the upper end of the outer tube C is sealed to the upper end of the pump barrel C through the upper connector C, and the lower end of the outer tube C is sealed to the lower end of the pump barrel C through an air chamber seal C, and a closed air chamber annular cavity C is formed between the outer wall of the pump barrel C and the inner wall of the outer tube C; The plunger assembly is installed inside the pump cylinder C and can reciprocate along the pump cylinder C axis. The plunger assembly is in sealed contact with the inner wall of the pump cylinder C. A discharge valve is provided at the lower end of the plunger assembly. The suction valve C is located below the pump cylinder C. A flow turbulence component is also provided on the outer wall of the pump cylinder C. The flow turbulence component is located above the communication port C.

[0012] Preferably, the suction valve C is installed inside the lower connector C.

[0013] The beneficial effects of this invention compared to the prior art are: 1. The present invention adopts an integral pump barrel with a direct opening for communication, which cooperates with the outer tube to form an air chamber annular cavity, replacing the traditional split hollow pump barrel design. It does not require ensuring the coaxiality of the upper and lower pump barrel sections, which greatly reduces the processing accuracy requirements and assembly difficulty, and reduces manufacturing costs. 2. This invention opens up an independent displacement channel for the gas in the pump through the gas chamber annular cavity. During the complete stroke of the plunger reciprocating motion, the gas can be compressed, transferred and discharged, effectively improving the filling coefficient of the liquid in the pump barrel, avoiding the low pump efficiency or even gas lock phenomenon caused by a large amount of gas interference, and significantly improving the oil production efficiency of high gas-liquid ratio oil wells. 3. This invention can fully utilize the gas energy in the oil well to achieve continuous pumping and spraying, which is suitable for the production needs of oil wells with high gas-liquid ratio; at the same time, the volume of the gas chamber annulus can be flexibly adjusted by replacing the outer pipe with different inner diameters to adapt to oil well conditions with different gas contents, and has a wide range of applications. 4. The present invention is equipped with a turbulence component, which can increase the gas buffer space when the gas enters the gas chamber ring cavity from bottom to top; when the gas flows back, large-volume bubbles are cut and crushed into tiny bubbles, which are more easily dissolved in crude oil liquid, reducing the amount of free gas retention, enhancing the gas-liquid mixing and discharge effect, and further weakening the negative impact of gas on pumping efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the state of the plunger assembly at the start of its upward stroke in Example 1; Figure 2 This is a schematic diagram of the state when the plunger assembly blocks the communication port during upward movement in Example 1; Figure 3 This is a schematic diagram of the state when the bottom of the plunger assembly is higher than the communication port in Example 1; Figure 4 This is a schematic diagram of the state when the plunger assembly blocks the communication port during downward movement in Example 1; Figure 5 This is a schematic diagram of the state when the top of the plunger assembly is lower than the communication port in Embodiment 1; Figure 6 yes Figure 1 A magnified view of a portion of region D in the middle; Figure 7 This is a top view of the spoiler component; Figure 8 This is a schematic diagram of the state of gas passing through the turbulence component from bottom to top; Figure 9 This is a schematic diagram of the state of gas passing through the turbulence component from top to bottom; Figure 10 This is a structural schematic diagram of Example 2; Figure 11 This is a schematic diagram of the structure of Example 3.

[0015] In the diagram: 1. Upper connector A; 2. Outer pipe A; 3. Pump barrel A; 4. Connecting port A; 5. Air chamber annular cavity A; 6. Plunger cylinder; 7. Discharge valve; 8. Booster; 9. Suction valve A; 10. Air chamber seal A; 11. Lower connector A; 12. Suction chamber; 13. Upper chamber; 14. Elastic ring; 15. Inner ring steel plate; 16. Slit return channel; 17. Upper connector B; 18. Air chamber seal B; 19. Outer pipe B; 20. Pump barrel B; 21. Air chamber annular cavity B; 22. Connecting port B; 23. Suction valve B; 24. Lower connector B; 25. Upper connector C; 26. Pump barrel C; 27. Outer pipe C; 28. Air chamber annular cavity C; 29. ​​Connecting port C; 30. Suction valve C; 31. Lower connector C; 32. Air chamber seal C. Detailed Implementation

[0016] Example 1 like Figures 1-9 As shown, this embodiment is achieved through the following technical solution: it includes a pump barrel outer tube assembly A, a plunger assembly, and a suction valve A9; the pump barrel outer tube assembly A includes an upper connector A1, a pump barrel A3, an outer tube A2, and a lower connector A11. A communication port A4 is opened on the upper part of the pump barrel A3. The outer tube A2 is sleeved on the outside of the pump barrel A3. The upper end of the outer tube A2 is sealed to the upper end of the pump barrel A3 through the upper connector A1. The lower end of the outer tube A2 is sealed to the lower end of the pump barrel A3 through the lower connector A11 and the air chamber seal A10. The air chamber seal A10 is a sealing ring; a sealed air chamber annular cavity A5 is formed between the outer wall of the pump barrel A3 and the inner wall of the outer tube A2. The plunger assembly is axially reciprocating and installed inside the pump barrel A3, and is in sealed contact with the inner wall of the pump barrel A3. A discharge valve 7 is provided at the lower end of the plunger assembly; a suction valve A9 is located below the pump barrel A3. A flow turbulence assembly is also provided on the outer wall of the pump barrel A3, and the flow turbulence assembly is located above the connecting port A4.

[0017] In this embodiment, the plunger assembly includes a plunger body 6, which is a cylindrical structure with its upper and lower parts connected. A discharge valve 7 is located at the lower end of the plunger body 6, and a booster 8 is installed at the lower end of the discharge valve 7 to assist in its opening and closing. A suction valve A9 is installed below the inner side of the pump cylinder A3 to control the entry of the oil-gas mixture from outside the pump into the pump.

[0018] The turbulence-disrupting component includes an inner steel plate 15 and an elastic ring 14. The elastic ring 14 is fixedly connected to the outer edge of the inner steel plate 15. Several slit return channels 16 are arranged in a circumferential array on the inner steel plate 15. The elastic ring 14 is in elastic contact with the outer tube A2. Gas can only enter the area above the turbulence-disrupting component by pushing open the elastic ring 14 from bottom to top, or enter the area below the turbulence-disrupting component by passing through the slit return channels 16.

[0019] The outer tube A2 is a replaceable structure. By replacing the outer tube A2 with different inner diameter specifications, the volume of the gas chamber ring cavity A5 can be flexibly adjusted to adapt to oil well conditions with different gas contents.

[0020] The connecting port A4 is a connecting groove structure opened along the wall of the pump cylinder A3, realizing fluid communication between the air chamber annular cavity A5 and the internal cavity of the pump cylinder A3. The discharge valve 7 can adopt a single valve structure or a common double valve structure to meet the needs of different application scenarios.

[0021] The working process of this embodiment is as follows: 1. The initial stage of the upstroke, such as Figure 1 : The plunger assembly moves upward from the lower end of the pump barrel A3 cavity. At this time, the discharge valve 7 remains closed under its own weight and the pressure of the well fluid above. The suction valve A9 opens under the combined action of the submersion pressure and the suction negative pressure. The oil and gas mixture in the well enters the suction chamber 12 of the pump below the plunger assembly. As the plunger assembly moves upward, the volume of the suction chamber 12 increases and the oil and gas mixture gradually fills the suction chamber 12. At the same time, the well fluid in the upper chamber 13 of the pump above the plunger assembly is lifted upwards and gradually discharged to the wellhead.

[0022] During this process, the pressure of the oil-gas mixture filling the gas chamber A5 increases to be equal to the well fluid discharge pressure; a small amount of gas is recompressed and dissolved, and most of the undissolved gas enters the upper chamber 13 of the pump through the connecting port A4 under the pressure of the liquid, and is lifted upward together with the well fluid, and finally discharged from the wellhead.

[0023] 2. During the middle stage of the upward stroke, such as Figure 2 : As the plunger assembly continues to move upwards, it gradually blocks the connecting port A4. At this point, the remaining undischarged well fluid in the gas chamber annulus A5 is temporarily sealed off, and the pressure in the gas chamber annulus A5 remains equal to the discharge pressure. Until the lower end of the plunger assembly passes the connecting port A4, the gas chamber annulus A5 connects with the suction chamber 12 of the pump barrel A3. The pressure in the gas chamber annulus A5 gradually decreases to the same as the suction pressure. The working section of the gas chamber annulus A5 above the connecting port A4 awaits gas-liquid replacement (liquid settles and flows out of the gas chamber annulus A5, and gas enters the gas chamber annulus A5). The working section of the gas chamber annulus A5 participating in gas-liquid replacement is the part above the connecting port A4; the part of the annulus below the connecting port A4 contains a relatively static and stable liquid phase.

[0024] 3. From the end of the upstroke to the beginning of the downstroke, such as Figure 3 : As the plunger assembly continues to move upward, the oil-gas mixture that is drawn in is gradually separated by the suction action. The gas rises and concentrates in the upper part of the pump's suction chamber 12 below the plunger assembly, and enters the upper working section of the gas chamber ring cavity A5 through the connecting port A4 for gas-liquid replacement (liquid settles and flows out of the gas chamber ring cavity A5, and gas enters the gas chamber ring cavity A5) until the end of the upstroke. During this process, the suction chamber 12 is isolated from the high pressure of the wellbore in the tubing above the plunger assembly due to the closure of the discharge valve 7. The pressure of the suction chamber 12 is significantly reduced relative to the wellbore pressure. However, the pump lower suction port is located below the formation fluid surface and still bears the formation fluid submersion pressure. Under the action of the formation fluid submersion pressure, the mixed well fluid enters the suction chamber 12 through the pump lower suction port. At this time, the upper part of the suction chamber 12 and the gas chamber annular cavity A5 form a communication device, and the pressure tends to be the same. The liquid remaining in the upper part of the gas chamber annular cavity A5 can flow downward into the suction chamber 12 under the action of gravity through the slit return channel 16 of the turbulence component. The separated gas continues to increase. If there is liquid remaining in the area above the turbulence component, part of the gas pushes open the elastic ring 14 from bottom to top through the communication port A4 and enters the area above the turbulence component. If there is no liquid remaining in the area above the turbulence component, the outer periphery of the elastic ring 14 and the slit return channel 16 are both upward channels for gas, providing an expanded compression space for the escaping gas. The other part remains in the upper part of the suction chamber 12. At the beginning of the downstroke, the plunger assembly begins to descend. At this time, the suction valve A9 at the lower end of the pump is closed, and the discharge valve 7 has not yet opened. The volume of the suction chamber 12 decreases, and the pressure inside the chamber gradually increases. The gas released in the upper part of the suction chamber 12 is further forced into the gas chamber annular cavity A5 (including the length of the connecting port A4). When the pressure inside the suction chamber 12 rises to be equal to the wellbore pressure in the upper tubing of the plunger assembly, the discharge valve 7 opens. As the plunger assembly continues to descend, the mixture in the suction chamber 12 is discharged into the tubing through the inner hole of the plunger assembly.

[0025] 4. During the middle stage of the downstroke, such as Figure 4 : The plunger assembly continues to descend to the closed gas chamber ring cavity A5 state, where the gas in the gas chamber ring cavity A5 is temporarily compressed and sealed to maintain a high pressure state.

[0026] 5. At the end of the downstroke, such as Figure 5 : As the plunger assembly continues to descend until its upper end is below the connecting port A4, the gas chamber annular cavity A5 connects with the upper chamber 13. At this time, the compressed gas in the gas chamber annular cavity A5 expands and escapes into the upper chamber 13 as the pressure decreases. Simultaneously, liquid enters the gas chamber annular cavity A5 and displaces some of the gas. The escaped gas is lifted by the well fluid with the next upward stroke of the plunger assembly and is gradually discharged from the wellhead. During this process, the compressed gas accumulated above the turbulence component expands and escapes, passing through the slit return channel 16 from top to bottom and entering the area below the turbulence component; when the gas passes through the slit return channel 16, it is broken into tiny bubbles, which facilitates dissolution into the well fluid and is carried out by the well fluid.

[0027] With each complete stroke of the plunger assembly (including one upward stroke and one downward stroke), excess gas in the wellbore is transferred and displaced through the gas chamber A5 instead of passing through the plunger assembly's inner bore. This efficient transfer of gas from below the pump to above the pump, utilizing the compressibility of gas, avoids the problems of low pumping efficiency and even gas lock-up in high-gas-content oil wells encountered by conventional tubular pumps.

[0028] Example 2 like Figure 10 As shown, this embodiment is achieved through the following technical solution: it includes a pump barrel outer tube assembly B, a plunger assembly, and a suction valve B23; the pump barrel outer tube assembly B includes an upper connector B17, a pump barrel B20, an outer tube B19, and a lower connector B24. The pump barrel B20 has a communication port B22 at its upper part. The outer tube B19 is sleeved on the outside of the pump barrel B20. The upper end of the outer tube B19 is sealed to the upper end of the pump barrel B20 through the upper connector B17 and the air chamber seal B18, where the air chamber seal B18 is a sealing ring; the lower end of the outer tube B19 is sealed to the lower end of the pump barrel B20 through the lower connector B24. The outer wall of the pump barrel B20 and the inner wall of the outer tube B19 surround each other to form a sealed air chamber annular cavity B21. The plunger assembly is axially reciprocating and installed inside the pump barrel B20, and is in sealing contact with the inner wall of the pump barrel B20. A discharge valve 7 is located at the lower end of the plunger assembly. A suction valve B23 is located below the pump barrel B20. A flow-turbulence assembly is also provided on the outer wall of the pump barrel B20, located above the connecting port B22. The suction valve B23 is installed inside the lower connector B24.

[0029] Example 3 like Figure 11 As shown, this embodiment is achieved through the following technical solution: it includes a pump barrel outer tube assembly C, a plunger assembly, and a suction valve C30; the pump barrel outer tube assembly C includes an upper connector C25, a pump barrel C26, an outer tube C27, and a lower connector C31. The pump barrel C26 has a communication port C29 at its upper part. The outer tube C27 is sleeved on the outside of the pump barrel C26. The upper end of the outer tube C27 is sealed to the upper end of the pump barrel C26 through the upper connector C25. The lower end of the outer tube C27 is sealed to the lower end of the pump barrel C26 through a gas chamber seal C32, which is a sealing ring; a sealed gas chamber annular cavity C28 is formed between the outer wall of the pump barrel C26 and the inner wall of the outer tube C27. The plunger assembly is axially reciprocating and mounted inside the pump barrel C26, and is in sealing contact with the inner wall of the pump barrel C26. A discharge valve 7 is located at the lower end of the plunger assembly; a suction valve C30 is located below the pump barrel C26. A flow-turbulence assembly is also provided on the outer wall of the pump barrel C26, located above the connecting port C29. The suction valve C30 is installed inside the lower connector C31.

Claims

1. A gas-liquid mixing pump with an annular gas chamber, characterized in that, It includes a pump barrel outer tube assembly A, a plunger assembly and a suction valve A (9); the pump barrel outer tube assembly A includes an upper connector A (1), a pump barrel A (3), an outer tube A (2) and a lower connector A (11). A communication port A (4) is opened on the upper part of the pump barrel A (3). The outer tube A (2) is sleeved on the outside of the pump barrel A (3). The upper end of the outer tube A (2) is sealed to the upper end of the pump barrel A (3) through the upper connector A (1). The lower end of the outer tube A (2) is sealed to the lower end of the pump barrel A (3) through the lower connector A (11) and the air chamber seal A (10). The outer wall of the pump barrel A (3) and the inner wall of the outer tube A (2) surround each other to form a closed air chamber annular cavity A (5). The plunger assembly is installed inside the pump cylinder A (3) and can reciprocate along the axial direction of the pump cylinder A (3). The plunger assembly is in sealed contact with the inner wall of the pump cylinder A (3). A discharge valve (7) is provided at the lower end of the plunger assembly. The suction valve A (9) is located below the pump cylinder A (3). A flow turbulence component is also provided on the outer wall of the pump cylinder A (3). The flow turbulence component is located above the communication port A (4). The aforementioned turbulence component includes an inner steel plate (15) and an elastic ring (14). The elastic ring (14) is fixedly connected to the outer edge of the inner steel plate (15). Several slit return channels (16) are arranged in a circular array on the inner steel plate (15). The elastic ring (14) is in elastic contact with the outer tube A (2). Gas can only enter the area above the spoiler assembly by pushing open the elastic ring (14) from bottom to top, or enter the area below the spoiler assembly by passing through the slit return channel (16); When the gas passes through the slit return channel (16), it is broken into tiny bubbles, which facilitates dissolution into the well fluid and is carried out by the well fluid.

2. The gas-liquid mixing pump with an annular cavity as described in claim 1, characterized in that, The plunger assembly includes a plunger body (6), which is a cylindrical structure with the upper and lower parts connected; a discharge valve (7) is located at the lower end of the plunger body (6), and a booster (8) is installed at the lower end of the discharge valve (7).

3. The gas-liquid mixing pump with an annular cavity as described in claim 2, characterized in that, The suction valve A(9) is installed on the lower inner side of the pump cylinder A(3).

4. A gas-liquid mixing pump with an annular gas chamber, characterized in that, It includes a pump barrel outer tube assembly B, a plunger assembly and a suction valve B (23); the pump barrel outer tube assembly B includes an upper connector B (17), a pump barrel B (20), an outer tube B (19) and a lower connector B (24). A communication port B (22) is opened on the upper part of the pump barrel B (20). The outer tube B (19) is sleeved on the outside of the pump barrel B (20). The upper end of the outer tube B (19) is sealed to the upper end of the pump barrel B (20) through the upper connector B (17) and the air chamber seal B (18). The lower end of the outer tube B (19) is sealed to the lower end of the pump barrel B (20) through the lower connector B (24). The outer wall of the pump barrel B (20) and the inner wall of the outer tube B (19) surround each other to form a closed air chamber annular cavity B (21). The plunger assembly is installed inside the pump barrel B (20) and can reciprocate along the axial direction of the pump barrel B (20). The plunger assembly is in sealed contact with the inner wall of the pump barrel B (20). A discharge valve (7) is provided at the lower end of the plunger assembly. The suction valve B (23) is located below the pump barrel B (20). A flow turbulence component is also provided on the outer wall of the pump barrel B (20). The flow turbulence component is located above the communication port B (22). The aforementioned turbulence component includes an inner steel plate (15) and an elastic ring (14). The elastic ring (14) is fixedly connected to the outer edge of the inner steel plate (15). Several slit return channels (16) are arranged in a circular array on the inner steel plate (15). The elastic ring (14) is in elastic contact with the outer tube A (2). Gas can only enter the area above the spoiler assembly by pushing open the elastic ring (14) from bottom to top, or enter the area below the spoiler assembly by passing through the slit return channel (16); When the gas passes through the slit return channel (16), it is broken into tiny bubbles, which facilitates dissolution into the well fluid and is carried out by the well fluid.

5. The gas-liquid mixing pump with an annular cavity as described in claim 4, characterized in that, The suction valve B(23) is installed inside the lower connector B(24).

6. A gas-liquid mixing pump with an annular gas chamber, characterized in that, It includes a pump barrel outer tube assembly C, a plunger assembly and a suction valve C (30); the pump barrel outer tube assembly C includes an upper connector C (25), a pump barrel C (26), an outer tube C (27) and a lower connector C (31). The upper part of the pump barrel C (26) has a communication port C (29). The outer tube C (27) is sleeved on the outside of the pump barrel C (26). The upper end of the outer tube C (27) is sealed to the upper end of the pump barrel C (26) through the upper connector C (25). The lower end of the outer tube C (27) is sealed to the lower end of the pump barrel C (26) through the air chamber seal C (32). The outer wall of the pump barrel C (26) and the inner wall of the outer tube C (27) surround each other to form a closed air chamber annular cavity C (28). The plunger assembly is installed inside the pump barrel C(26) and can reciprocate along the axial direction of the pump barrel C(26). The plunger assembly is in sealed contact with the inner wall of the pump barrel C(26). A discharge valve (7) is provided at the lower end of the plunger assembly. The suction valve C(30) is located below the pump barrel C(26). A flow turbulence component is also provided on the outer wall of the pump barrel C(26). The flow turbulence component is located above the communication port C(29). The aforementioned turbulence component includes an inner steel plate (15) and an elastic ring (14). The elastic ring (14) is fixedly connected to the outer edge of the inner steel plate (15). Several slit return channels (16) are arranged in a circular array on the inner steel plate (15). The elastic ring (14) is in elastic contact with the outer tube A (2). Gas can only enter the area above the spoiler assembly by pushing open the elastic ring (14) from bottom to top, or enter the area below the spoiler assembly by passing through the slit return channel (16); When the gas passes through the slit return channel (16), it is broken into tiny bubbles, which facilitates dissolution into the well fluid and is carried out by the well fluid.

7. The gas-liquid mixing pump with an annular cavity as described in claim 6, characterized in that, The suction valve C(30) is installed inside the lower connector C(31).

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