Pressure balance compensation device of submersible diaphragm pump for oil extraction

Abstract

The invention discloses a submersible diaphragm pump pressure balance compensation device for oil extraction. The problems that a diaphragm of an existing submersible diaphragm pump moves up and down to be out of position, and pressure is unbalanced are mainly solved. The invention is characterized in that the bottom of the diaphragm (1) is connected with a diaphragm plunger (4), a compensation base body (6) is arranged outside the diaphragm plunger (4), a plunger cylinder sleeve (11) is arranged at the lower part of the compensation base body (6), a lifting plunger (14) is arranged in the plunger cylinder sleeve (11), and a spring (16) is arranged between the upper part of the lifting plunger (14) and a step in the compensation base body (6); a diaphragm support (8) is arranged on the lower portion of the diaphragm (1), the compensation base body (6) is located in the diaphragm support (8), a liquid inlet valve (19) and a liquid outlet valve (5) are arranged on the side wall of the compensation base body (6), and a circulation hole (18) is formed in the diaphragm support (8). The pressure balance compensation device of the submersible diaphragm pump for oil extraction can ensure the up-and-down movement position and pressure balance of the diaphragm.

Description

Technical Field

[0001] The invention relates to the technical field of oil field production engineering, in particular to a pressure balance compensation device for a submersible diaphragm pump used for oil production. Background Art

[0002] In the middle and late stages of oilfield development, the development of unconventional reservoirs has become a continuous force for sustained and stable production. Unconventional reservoir media contain high amounts of gas and sand, and the proportion of highly deviated wells and horizontal wells is high. Most of the newly commissioned wells are directional wells and horizontal wells, and the production capacity decreases rapidly under the elastic development model. Among them, low-yield wells and highly deviated wells mostly use electric submersible diaphragm pump lifting technology to produce oil. The current submersible diaphragm pump has problems with up and down movement of the diaphragm and pressure imbalance. Summary of the invention

[0003] In order to overcome the problems of diaphragm displacement and pressure imbalance in existing submersible diaphragm pumps, the present invention provides a pressure balance compensation device for a submersible diaphragm pump for oil production, which can ensure the position and pressure balance of the diaphragm when it moves up and down.

[0004] The technical solution of the present invention is: a pressure balance compensation device for a submersible diaphragm pump for oil production, comprising a pump barrel, the upper part of the pump barrel is connected to a diaphragm, the bottom of the diaphragm is connected to a diaphragm plunger, a compensation base is arranged outside the diaphragm plunger, a plunger cylinder sleeve is arranged below the compensation base, a lifting plunger is arranged inside the plunger cylinder sleeve, and a spring is arranged between the upper part of the lifting plunger and the step inside the compensation base; A diaphragm bracket is provided at the lower part of the diaphragm, a compensation matrix is ​​located inside the diaphragm bracket, a liquid inlet valve and a liquid outlet valve are provided on the side wall corresponding to the compensation matrix and the diaphragm plunger, and a circulation hole is opened on the diaphragm bracket corresponding to the liquid inlet valve and the liquid outlet valve; The bottom of the pump barrel is connected to a compensation liquid protection bag.

[0005] The upper end of the diaphragm bracket is internally connected to the diaphragm seat, and the compensation base is located below the diaphragm seat.

[0006] The interior of the diaphragm seat is a diaphragm cavity, the interior of the compensation base is a compensation cavity, the interior of the compensation base and the upper part of the lifting plunger are plunger cavities, the outside of the diaphragm bracket and the pump barrel are circulation cavities, and the compensation liquid protection bag and the diaphragm bracket are protection cavities.

[0007] A plurality of compensation substrate communication holes are formed on the upper portion of the compensation substrate, and the compensation substrate communication holes are connected with the diaphragm cavity and the plunger cavity.

[0008] When the lifting plunger moves upward, the spring is compressed, the pressure inside the plunger cavity increases, and the compensation fluid in the plunger cavity transfers the pressure to the diaphragm cavity through the connecting hole of the compensation base. The pressure of the compensation fluid in the diaphragm cavity increases, pushing the diaphragm to move upward, and the diaphragm pushes the oil above to the ground; when the lifting plunger moves upward to the top dead point, the spring rebounds, pushing the lifting plunger downward, the pressure of the compensation fluid in the plunger cavity decreases, and the pressure of the compensation fluid in the diaphragm cavity decreases accordingly, the diaphragm moves downward, and the oil flows to the top of the diaphragm to complete a stroke.

[0009] When the lifting plunger pushes the diaphragm upward through the compensation fluid, the diaphragm plunger moves upward with the diaphragm, the liquid outlet valve is exposed from the lower end of the diaphragm plunger, and the liquid outlet valve opens under the action of the compensation fluid pressure in the compensation chamber. The compensation fluid flows out from the compensation chamber through the circulation through hole to the circulation chamber, and the compensation fluid enters the protection chamber from the circulation chamber, and the compensation fluid protection bag expands; the diaphragm no longer continues to move upward, maintaining the top dead center position, and the diaphragm chamber pressure is balanced with the circulation chamber pressure.

[0010] When the lifting plunger moves downward, the compensation liquid pressure in the plunger chamber decreases, the diaphragm moves downward, the liquid inlet valve is exposed from the upper end of the diaphragm plunger, and the liquid inlet valve opens under the action of the compensation liquid pressure in the circulation chamber. The compensation liquid flows from the circulation chamber through the circulation through hole into the compensation chamber, the compensation liquid pressure in the compensation chamber increases, the diaphragm no longer moves downward, and maintains the bottom dead center position.

[0011] The present invention has the following beneficial effects: Due to the adoption of the above scheme, the present invention sets the diaphragm chamber, compensation chamber, plunger chamber, protection chamber, and circulation chamber, and the two parts of compensation liquid are separated in static state, one part of the compensation liquid is stored in the diaphragm chamber, compensation chamber, and plunger chamber, and the other part of the compensation liquid is stored in the protection chamber and the circulation chamber; in dynamic state, the compensation liquid inlet valve and outlet valve can be circulated to keep the pressure and volume of the compensation liquid in the diaphragm chamber in a stable state, ensuring the position and pressure balance of the diaphragm moving up and down. At the same time, the circulation of the two parts of compensation liquid can also effectively dissipate heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention.

[0013] In the figure, 1-diaphragm, 2-diaphragm seat, 3-diaphragm cavity, 4-diaphragm plunger, 5-liquid outlet valve, 6-compensation base, 7-compensation base connecting hole, 8-diaphragm bracket, 9-pump barrel, 10-circulation cavity, 11-plunger cylinder sleeve, 12-compensation liquid protection bag, 13-protection cavity, 14-lifting plunger, 15-plunger cavity, 16-spring, 17-compensation cavity, 18-circulation hole, 19-liquid inlet valve. Implementation

[0014] The present invention will be further described below in conjunction with the accompanying drawings: Depend on Figure 1 As shown, a pressure balance compensation device for a submersible diaphragm pump for oil production includes a pump barrel 9, the upper part of the pump barrel 9 is connected to a diaphragm 1, and a diaphragm bracket 8 is provided at the lower part of the diaphragm 1. The diaphragm bracket 8 is threadedly connected to the inside of the pump barrel 9, and an annular cavity is formed between the diaphragm bracket 8 and the pump barrel 9, which is called a circulation cavity 10. The diaphragm bracket 8 is internally threadedly connected to the diaphragm seat 2, and a compensation base 6 is provided at the lower part of the diaphragm seat 2. The compensation base 6 is located inside the diaphragm bracket 8. The diaphragm plunger 4 is connected to the middle part below the diaphragm 1, and the vibration of the diaphragm 1 can drive the diaphragm plunger 4 to move up and down. The diaphragm plunger 4 is located inside the compensation base 6. Here, the inner cavity of the compensation base 6 where the diaphragm plunger 4 is located is called the compensation cavity 17, and the inner cavity of the diaphragm seat 2 is called the compensation cavity 17, and the compensation cavity 17 is connected to the compensation cavity 17. The inner diameter of the lower part of the compensation base 6 is larger than the inner diameter of the upper diaphragm plunger 4, and a step is formed at the diameter change. A plunger sleeve 11 is provided at the lower part of the compensation base 6, and a lifting plunger 14 is provided inside the plunger sleeve 11. The lifting plunger 14 can move up and down inside the plunger sleeve 11. A spring 16 is provided between the upper part of the lifting plunger 14 and the step surface of the compensation base 6. A plunger cavity 15 is formed inside the compensation base 6 and on the upper part of the lifting plunger 14. The plunger cavity 15 is connected to the compensation cavity 17. The compensation base 6 is provided with a plurality of longitudinal compensation base communicating holes 7, and the compensation base communicating holes 7 communicate the plunger cavity 15 with the upper diaphragm cavity 3.

[0015] The side wall of the diaphragm bracket 8 is provided with a plurality of circulation holes 18, and the outside of the circulation hole 18 is the circulation chamber 10. Two valve bodies are provided on the upper side wall of the compensation base 6 corresponding to the diaphragm plunger 4, which are respectively an inlet valve 19 and an outlet valve 5. The inlet valve 19 and the outlet valve 5 are both one-way valves, corresponding to a circulation hole 18 respectively, and the inlet valve 19 and the outlet valve 5 connect the compensation chamber 17 with the circulation chamber 10. The lower end of the pump barrel 9 is connected to the compensation liquid protection capsule 12, which is made of rubber material, has elasticity, and can withstand the thermal expansion and contraction of the compensation liquid. The interior of the compensation liquid protection capsule 12 is a protection chamber 13, which is connected to the circulation chamber 10, and the protection chamber 13 and the plunger chamber 15 are separated by a lifting plunger 14.

[0016] When the lifting plunger 14 in the plunger chamber 15 moves upward, the return spring 16 is compressed, the internal pressure of the plunger chamber 15 increases, pushing the compensation liquid in the plunger chamber 15, and the compensation liquid transfers the pressure to the diaphragm chamber 3 through the compensation base connecting hole 7. The pressure of the compensation liquid in the diaphragm chamber 3 increases, pushing the diaphragm 1 upward, and the diaphragm 1 pushes the oil above to the ground.

[0017] When the lifting plunger 14 moves upward to the top dead center, the return spring 16 rebounds, pushing the lifting plunger 14 back and moving downward. The compensating liquid pressure in the plunger chamber 15 decreases. Due to the connection of the compensation base connecting hole 7, the compensating liquid pressure in the diaphragm chamber 3 decreases, the diaphragm 1 moves downward, and the oil flows to the top of the diaphragm 1, completing a stroke.

[0018] When the lifting plunger 14 moves upward and pushes the diaphragm 1 upward through the compensation liquid, the diaphragm plunger 4 will move upward with the diaphragm 1. If the compensation liquid pressure in the plunger chamber 15 increases further, the diaphragm 1 continues to move upward, the diaphragm plunger 4 continues to move upward, and the lower end of the diaphragm plunger 4 exposes the liquid outlet valve 5. The liquid outlet valve 5 opens under the pressure of the compensation liquid in the compensation chamber 17, and the compensation liquid flows out from the compensation chamber 17 through the circulation through hole 18 to the circulation chamber 10. Since the circulation chamber 10 is connected with the protection chamber 13, the compensation liquid enters the protection chamber 13 from the circulation chamber 10, and the compensation liquid protection bag 12 of the protection chamber 13 expands. The diaphragm 1 no longer continues to move upward and maintains the top dead center position. The pressure of the diaphragm chamber 3 is balanced with the pressure of the circulation chamber 10.

[0019] When the lifting plunger 14 moves downward, the compensation liquid pressure in the plunger chamber 15 decreases, the diaphragm 1 moves downward, and the diaphragm 1 continues to move downward under the oil pressure. When the upper end of the diaphragm plunger 4 exposes the liquid inlet valve 19, the liquid inlet valve 19 opens under the action of the compensation liquid pressure in the circulation chamber 10, and the compensation liquid flows from the circulation chamber 10 through the circulation through hole 18 into the compensation chamber 17. The compensation liquid pressure in the compensation chamber 17 increases, and the diaphragm 1 no longer moves downward, maintaining the bottom dead center position.

[0020] In this process, the diaphragm 1 moves up and down in a balanced position through the outflow and inflow of the compensation liquid, and the upper and lower pressures are balanced. The diaphragm cavity 3, the compensation cavity 17, the plunger cavity, the protection cavity 13, and the circulation cavity 10 are arranged so that the two parts of the compensation liquid can be isolated in static state, and in dynamic state, the compensation liquid pressure and volume in the diaphragm cavity can be kept in a stable state through the circulation of the liquid inlet valve 19 and the liquid outlet valve.

Claims

1. A pressure balance compensation device for a submersible diaphragm pump for oil production, comprising a pump barrel (9), the upper part of which is connected to a diaphragm (1), characterized in that: The bottom of the diaphragm (1) is connected to the diaphragm plunger (4), a compensation base (6) is provided outside the diaphragm plunger (4), a plunger cylinder sleeve (11) is provided below the compensation base (6), a lifting plunger (14) is provided inside the plunger cylinder sleeve (11), and a spring (16) is provided between the upper part of the lifting plunger (14) and the step inside the compensation base (6); A diaphragm bracket (8) is provided at the lower part of the diaphragm (1), a compensation base (6) is located inside the diaphragm bracket (8), a liquid inlet valve (19) and a liquid outlet valve (5) are provided on the side wall at the corresponding position of the compensation base (6) and the diaphragm plunger (4), and a circulation hole (18) is opened on the diaphragm bracket (8) at the corresponding position of the liquid inlet valve (19) and the liquid outlet valve (5); The bottom of the pump barrel (9) is connected to a compensation liquid protection bag (12).

2. The pressure balance compensation device for a submersible diaphragm pump for oil production according to claim 1 is characterized in that: The upper end of the diaphragm support (8) is internally connected to the diaphragm seat (2), and the compensation base (6) is located below the diaphragm seat (2).

3. The pressure balance compensation device for a submersible diaphragm pump for oil production according to claim 2 is characterized in that: The interior of the diaphragm seat (2) is a diaphragm cavity (3), the interior of the compensation base (6) is a compensation cavity (17), the interior of the compensation base (6) and the upper part of the lifting plunger (14) are plunger cavities (15), the outside of the diaphragm support (8) and between the pump barrel (9) are circulation cavities (10), and the protection cavity (13) is between the compensation liquid protection bag (12) and the diaphragm support (8).

4. The pressure balance compensation device for a submersible diaphragm pump for oil production according to claim 3 is characterized in that: A plurality of compensation substrate communication holes (7) are formed on the upper portion of the compensation substrate (6), and the compensation substrate communication holes (7) are connected to the diaphragm cavity (3) and the plunger cavity (15).

5. The pressure balance compensation device for a submersible diaphragm pump for oil production according to claim 4 is characterized in that: When the lifting plunger (14) moves upward, the spring (16) is compressed, the pressure inside the plunger chamber (15) increases, and the compensation fluid in the plunger chamber (15) transmits the pressure to the diaphragm chamber (3) through the compensation base connecting hole (7). The pressure of the compensation fluid in the diaphragm chamber (3) increases, pushing the diaphragm (1) upward, and the diaphragm (1) pushes the oil above to the ground; When the lifting plunger (14) moves upward to the top dead center, the spring (16) rebounds, pushing the lifting plunger (14) downward, the compensating fluid pressure in the plunger chamber (15) decreases, and the compensating fluid pressure in the diaphragm chamber (3) decreases accordingly, the diaphragm (1) moves downward, and the oil flows to the top of the diaphragm (1), completing a stroke.

6. The pressure balance compensation device for a submersible diaphragm pump for oil production according to claim 5, characterized in that: When the lifting plunger (14) pushes the diaphragm (1) upward through the compensation fluid, the diaphragm plunger (4) moves upward along with the diaphragm (1), and the liquid outlet valve (5) is exposed from the lower end of the diaphragm plunger (4). The liquid outlet valve (5) opens under the pressure of the compensation fluid in the compensation chamber (17), and the compensation fluid flows out from the compensation chamber (17) through the circulation through hole (18) to the circulation chamber (10). The compensation fluid enters the protection chamber (13) from the circulation chamber (10), and the compensation fluid protection bag (12) expands; the diaphragm (1) no longer continues to move upward and maintains the top dead center position, and the pressure in the diaphragm chamber (3) is balanced with the pressure in the circulation chamber (10).

7. The pressure balance compensation device for a submersible diaphragm pump for oil production according to claim 5, characterized in that: When the lifting plunger (14) moves downward, the pressure of the compensating liquid in the plunger chamber (15) decreases, the diaphragm (1) moves downward, the liquid inlet valve (19) is exposed from the upper end of the diaphragm plunger (4), and the liquid inlet valve (19) opens under the action of the compensating liquid pressure in the circulation chamber (10). The compensating liquid flows from the circulation chamber (10) into the compensation chamber (17) through the circulation through hole (18). The pressure of the compensating liquid in the compensation chamber (17) increases, and the diaphragm (1) no longer moves downward, maintaining the bottom dead center position.

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