Underground oil reservoir decompression oil extraction separation device

Abstract

The utility model relates to the field of oil exploitation, in particular to an underground oil reservoir decompression oil extraction separation device which comprises a sleeve preset on the ground, an oil pipe is inserted into the sleeve, a sucker rod provided with an oil well pump is inserted into the oil pipe, the oil pipe comprises a hollow adjusting section, and a side wall valve and a one-way separation valve which are arranged up and down are installed on the adjusting section. A sealing piece used for sealing the outer wall of the oil pipe and the inner wall of the sleeve is installed on the outer side wall of the adjusting section, the sealing piece divides the interior of the sleeve into an upper-layer oil cavity and a lower-layer oil cavity, one end of the side wall valve is used for being communicated with the interior of the adjusting section, and the other end of the side wall valve is used for being communicated with the upper-layer oil cavity. An oil drain valve is further installed on the adjusting section and used for communicating the interior of the adjusting section with the lower-layer oil cavity, and a control piece used for controlling opening and closing of the oil drain valve is installed in the oil pipe. The method has the effect of improving the oil production efficiency of the oil reservoir and the recovery efficiency of the oil well.

Description

Technical Field

[0001] This application relates to the field of oil extraction, and in particular to a downhole reservoir decompression and oil production separation device. Background Technology

[0002] In the field of oil extraction, reservoir pumping technology is a key means of achieving crude oil production. Currently, reservoir pumping oil recovery processes mainly rely on the natural pressure difference within the oil well or simple mechanical pumping equipment for crude oil extraction.

[0003] However, with the continuous development of the oil extraction industry and the deepening of reservoir development, this technology faces significant problems. During reservoir extraction using casing, the upper oil layer in the well exerts considerable pressure on the lower reservoir layer. This pressure severely hinders the smooth flow of crude oil within the reservoir, making the migration of crude oil from the reservoir layer into the wellbore extremely difficult, thus leading to a significant reduction in reservoir oil production efficiency. Lower well recovery rates not only prolong the production cycle of individual wells and increase production costs, but also greatly affect the overall oil production efficiency of the well, limiting the increase in oil production and making it difficult to meet the ever-growing energy demand.

[0004] Therefore, how to effectively reduce the pressure of the upper oil layer on the reservoir and improve the oil production efficiency and oil well recovery rate has become a key technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] In order to improve reservoir oil production efficiency and well recovery rate, this application provides a downhole reservoir decompression and oil production separation device.

[0006] The downhole reservoir decompression and oil production separation device provided in this application adopts the following technical solution:

[0007] A downhole reservoir decompression and oil production separation device includes a casing pre-installed on the surface, an oil pipe inserted into the casing, and a sucker rod equipped with an oil pump inserted into the oil pipe. The oil pipe includes a hollow regulating section, on which sidewall valves and a one-way separation valve are installed vertically. A sealing element is installed on the outer wall of the regulating section to seal between the outer wall of the oil pipe and the inner wall of the casing. The sealing element divides the interior of the casing into an upper oil chamber and a lower oil chamber. One end of the sidewall valve is connected to the interior of the regulating section, and the other end is connected to the upper oil chamber. One end of the one-way separation valve is connected to the lower oil chamber, and the other end is connected to the upper oil chamber. An oil drain valve is also installed on the regulating section to connect the interior of the regulating section with the lower oil chamber. A control element for controlling the opening and closing of the oil drain valve is installed inside the oil pipe.

[0008] By adopting the above technical solution, during operation, the pumping unit is started, and the oil in the lower oil chamber is pumped away along the tubing. At this time, the hydraulic pressure in the upper chamber is greater than that in the lower chamber, which can close the upper and lower oil chamber channels, reduce the pressure on the reservoir, and facilitate crude oil seepage. When the oil pressure in the lower oil chamber increases, the one-way valve is opened, allowing the oil in the lower oil chamber to enter the upper oil chamber, thereby balancing the pressure between the upper and lower oil chambers and facilitating smooth oil extraction through the tubing. When the oil in the upper oil chamber reaches a certain height, the sidewall valve can be opened, allowing the oil in the upper oil chamber to enter the tubing and be transported upwards through the sidewall valve, thereby maintaining the liquid level of the upper oil within a certain range. When oil unloading is required, the drain valve is opened through the control components to facilitate smooth oil discharge, improving reservoir oil production efficiency and well recovery rate.

[0009] Preferably, the control component includes a release switch for an oil drain valve inserted inside the adjustment section. The release switch includes a mounting block fixedly connected to the sucker rod. At least one push rod is provided on the periphery of the mounting block. A mounting spring is fixedly connected between the push rod and the mounting block. The oil drain valve includes an oil discharge channel on the oil pipe. The opening of the oil discharge channel communicating with the lower oil chamber has a connecting port. The oil discharge channel has a mounting ball that abuts against the connecting port and blocks the connecting port. An oil discharge spring is fixedly connected between the mounting ball and the inner wall of the oil discharge channel. The push rod enters the oil discharge channel under the elastic force of the mounting spring and pushes the mounting ball away from the connecting port.

[0010] By adopting the above technical solution, the mounting block of the oil drainer release switch is lowered by the sucker rod until the push rod is aligned with the oil discharge channel. At this time, the push rod enters the oil discharge channel under the action of the installation spring, thereby pushing the installation ball to disengage from the communication port, realizing the opening of the oil drain valve, which can connect the inside of the adjustment section with the lower oil chamber, facilitating oil discharge.

[0011] Preferably, the mounting block is provided with six push rods on its periphery, and each push rod is fixedly connected to the mounting block with a mounting spring.

[0012] By adopting the above technical solution, when the sucker rod causes the mounting block to rotate unexpectedly, at least one pusher can reliably push the mounting ball away from the communication port, thereby controlling the opening of the drain valve and connecting the inside of the regulating section with the lower oil chamber.

[0013] Preferably, the mounting block has six mounting slots on its periphery, and each mounting slot is used to fix and connect a spring.

[0014] By adopting the above technical solution, six mounting slots are opened on the periphery of the mounting block to fix the mounting spring, making the installation of the mounting spring more stable. This ensures that the push rod is stably pushed into the oil unloading channel by the elastic force of the mounting spring, thereby reliably opening the oil drain valve and ensuring the normal operation of the oil drain function of the device.

[0015] Preferably, the push rod has a guide groove at one end near the mounting block, and the guide groove is inserted into the mounting block.

[0016] By adopting the above technical solution, the push rod can move along the guide of the mounting block, which enhances the stability and accuracy of the push rod movement, thereby more reliably pushing the mounting ball to open the connection port to realize the oil drainage function.

[0017] Preferably, the seal includes a plurality of sealing rings mounted on the outer wall of the adjusting section and abutting against the inside of the sleeve.

[0018] By adopting the above technical solution, using multiple sealing rings tightly against the inside of the casing can effectively seal the space between the outer wall of the tubing and the inner wall of the casing, dividing the inside of the casing into an upper oil cavity and a lower oil cavity, which is conducive to achieving stratified pressure relief oil production.

[0019] Preferably, the outer wall of the adjustment section is provided with multiple sealing grooves, one sealing ring corresponds to one sealing groove, and the sealing ring is engaged in the sealing groove.

[0020] By adopting the above technical solution, a sealing groove is opened on the outer wall of the adjustment section and the sealing ring is engaged in it, which can better fix the sealing ring and enhance the sealing effect.

[0021] Preferably, the one-way separation valve includes a one-way channel opened on the regulating section. The opening of the one-way channel near the lower oil chamber is provided with an oil inlet with a diameter smaller than that of the one-way channel. An regulating ball with a diameter larger than that of the oil inlet is provided inside the one-way channel. A one-way spring is fixedly connected between the regulating ball and the inner wall of the one-way channel. The regulating ball is pressed against the oil inlet by the force of the one-way spring and blocks the oil inlet.

[0022] By adopting the above technical solution, when the pressure is high, the oil in the lower oil chamber can overcome the force of the one-way spring on the adjusting ball, causing the adjusting ball to disengage from the oil inlet and automatically enter the upper oil chamber, thereby automatically balancing the oil pressure.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Improved reservoir oil production efficiency and oil well recovery rate;

[0025] 2. It facilitates the opening of the oil drain valve, enabling communication between the regulating section and the lower oil chamber for easy oil draining;

[0026] 3. Automatically balances the oil pressure between the upper and lower oil chambers. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view illustrating the separating device in an embodiment of this application.

[0028] Figure 2This is a schematic diagram illustrating the structure of the oil drain release switch in an embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Sleeve; 11. Upper oil chamber; 12. Lower oil chamber; 2. Oil pipe; 21. Adjusting section; 211. Sealing groove; 3. Seal; 31. Sealing ring; 4. Side wall valve; 41. Connecting channel; 42. Pressure regulating port; 43. Connecting ball; 44. Connecting spring; 5. One-way separation valve; 51. One-way channel; 52. Oil inlet; 53. Adjusting ball; 54. One-way spring; 6. Oil drain valve; 61. Oil unloading channel; 62. Connecting port; 63. Mounting ball; 64. Oil unloading spring; 7. Oil drain release switch; 71. Mounting block; 711. Mounting groove; 72. Push rod; 721. Guide groove; 73. Mounting spring. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.

[0031] This application discloses a downhole reservoir decompression and oil production separation device. (Refer to...) Figure 1 and Figure 2 The downhole reservoir decompression and oil production separation device includes a pre-installed drilling casing 1 on the surface, with an oil tubing 2 inserted inside the casing 1. A sucker rod is installed inside the oil tubing 2, and an oil extraction machine for driving the sucker rod is located on the surface where the well is drilled. A pump is installed at the bottom of the oil tubing 2, and the pump is connected to the sucker rod.

[0032] An adjusting section 21 is provided on the tubing 2, located above the oil pump. A sealing element 3 is installed on the outer wall of the adjusting section 21, sealing the outer wall of the tubing 2 with the inner wall of the casing 1, thereby dividing the interior of the casing 1 into an upper oil chamber 11 and a lower oil chamber 12. A sidewall valve 4 and a one-way separation valve 5 are integrally formed at the adjusting section 21, with the sidewall valve 4 located above the one-way separation valve 5. The sidewall valve 4 is located on one side of the tubing 2, i.e., eccentrically positioned; there can be one or more sidewall valves 4. The one-way separation valve 5 is also located on one side of the tubing 2, on the same side as the sidewall valve 4; there can be one or more one-way separation valves 5.

[0033] One end of the side wall valve 4 is used to communicate with the inside of the regulating section 21, and the other end is used to communicate with the upper oil chamber 11. One end of the one-way separation valve 5 is used to communicate with the lower oil chamber 12, and the other end is used to communicate with the upper oil chamber 11.

[0034] When the oil pressure in the lower oil chamber 12 is high, the one-way separation valve 5 is opened, allowing the oil in the lower oil chamber 12 to enter the upper oil chamber 11 along the one-way separation valve 5, thereby balancing the pressure between the upper oil chamber 11 and the lower oil chamber 12, facilitating smooth oil extraction. Furthermore, when the side wall valve 4 is opened, the oil in the upper oil chamber 11 enters the regulating section 21 along the side wall valve 4, thus maintaining the liquid level in the upper oil chamber 11 within a certain range.

[0035] Reference Figure 1 and Figure 2 The outer wall of the adjusting section 21 is provided with multiple sealing grooves 211, and the sealing element 3 includes a sealing ring 31 that is snapped into each sealing groove 211 to seal the outer wall of the oil pipe 2 and the inner wall of the casing 1.

[0036] The one-way valve 5 includes a one-way channel 51 formed on the regulating section 21. An oil inlet 52 is provided at the opening of the one-way channel 51 near the lower oil chamber 12. The diameter of the oil inlet 52 is smaller than the diameter of the one-way channel 51. An regulating ball 53 with a diameter larger than the oil inlet 52 is provided inside the one-way channel 51. A one-way spring 54 is fixedly connected between the regulating ball 53 and the inner wall of the one-way channel 51.

[0037] When the pressure in the lower oil chamber 12 is greater than the pressure in the upper oil chamber 11, the regulating ball 53 will compress the one-way spring 54, causing the oil to enter the guide channel from the oil inlet 52 and then enter the upper oil chamber 11 along the guide channel.

[0038] The sidewall valve 4 includes a connecting channel 41 formed on the regulating section 21. A pressure regulating port 42 is provided at the opening of the connecting channel 41 near the upper oil chamber 11. The diameter of the pressure regulating port 42 is smaller than the diameter of the connecting channel 41. A connecting ball 43 with a diameter larger than the pressure regulating port 42 is provided inside the connecting channel 41. A connecting spring 44 is fixedly connected between the connecting ball 43 and the inner wall of the connecting channel 41. The connecting ball 43 is blocked from the pressure regulating port 42 by the force of the connecting spring 44.

[0039] When the pressure in the upper oil chamber 11 is high, the pressure will push the connecting ball 43 to compress the connecting spring 44, causing the oil to enter the connecting channel 41 from the pressure regulating port 42 and then enter the regulating section 21 along the connecting channel 41.

[0040] An oil drain valve 6 is also installed on the regulating section 21 to connect the interior of the regulating section 21 with the lower oil chamber 12. The oil drain valve 6 includes an oil discharge channel 61 opened on the oil pipe 2, and a connecting port 62 is provided at the opening of the oil discharge channel 61 connecting with the lower oil chamber 12. A mounting ball 63 is provided at the connecting port 62, and an oil discharge spring 64 is fixedly connected between the mounting ball 63 and the inner wall of the oil discharge channel 61. The oil discharge spring 64 is pressed against the connecting port 62 by the force of the oil discharge spring 64, thus blocking the connecting port 62. A control component for controlling the opening and closing of the oil drain valve 6 is installed on the regulating section 21.

[0041] The control component includes a drain release switch 7 inserted inside the adjustment section 21. The drain release switch 7 includes a mounting block 71 fixedly connected to the sucker rod. A mounting groove 711 is formed on the periphery of the mounting block 71, and six push rods 72 are provided on the periphery of the mounting block 71. Each push rod 72 is connected to the mounting block 71 by a mounting spring 73. One end of the mounting spring 73 is fixedly connected to the push rod 72, and the other end is fixedly connected to the bottom wall of the mounting groove 711. A guide groove 721 is formed on the side wall of the push rod 72 near the mounting block 71, and the guide groove 721 is inserted into the mounting block 71.

[0042] When the sucker rod moves the mounting block 71 downwards until one of the push rods 72 is aligned with the unloading channel 61, the push rod 72 will push the mounting ball 63 away from the connecting port 62 under the action of the mounting spring 73, thereby opening the drain valve 6.

[0043] The implementation principle of the downhole reservoir pressure relief and oil production separation device according to an embodiment of this application is as follows: The downhole reservoir pressure relief and oil production separation device divides the inside of the casing 1 into upper and lower oil chambers through the sealing element 3. Utilizing the synergistic action of the sidewall valve 4, the one-way separation valve 5, and the drain valve 6, the pressure of the downhole reservoir can be regulated. By controlling the opening and closing of the drain valve 6, the connection and isolation between the regulating section 21 and the lower oil chamber 12 can be achieved, thereby facilitating oil drainage. Simultaneously, the one-way separation valve 5 ensures unidirectional flow of oil, facilitating the balance of pressure between the upper oil chamber 11 and the lower oil chamber 12.

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

Claims

1. A downhole reservoir decompression and oil production separation device, characterized in that: The system includes a casing (1) pre-installed on the ground, an oil pipe (2) inserted inside the casing (1), a sucker rod with an oil pump inserted inside the oil pipe (2), the oil pipe (2) including a hollow regulating section (21), a side wall valve (4) and a one-way separation valve (5) installed on the regulating section (21), and a sealing element (3) installed on the outer wall of the regulating section (21) to seal between the outer wall of the oil pipe (2) and the inner wall of the casing (1), the sealing element (3) dividing the interior of the casing (1) into an upper oil chamber (11). The side wall valve (4) is used to connect one end to the inside of the regulating section (21) and the other end to the upper oil chamber (11). One end of the one-way separation valve (5) is used to connect to the lower oil chamber (12) and the other end to the upper oil chamber (11). The regulating section (21) is also equipped with an oil drain valve (6). The oil drain valve (6) is used to connect the inside of the regulating section (21) to the lower oil chamber (12). The oil pipe (2) is equipped with a control component for controlling the opening and closing of the oil drain valve (6).

2. The downhole reservoir decompression and oil production separation device according to claim 1, characterized in that: The control component includes an oil drain release switch (7) inserted inside the adjustment section (21). The oil drain release switch (7) includes a mounting block (71) fixedly connected to the sucker rod. At least one push rod (72) is provided on the periphery of the mounting block (71). A mounting spring (73) is fixedly connected between the push rod (72) and the mounting block (71). The oil drain valve (6) includes an oil discharge channel (61) opened on the oil pipe (2). A connecting port (62) is provided at the opening of the oil discharge channel (61) communicating with the lower oil chamber (12). An mounting ball (63) is provided in the oil discharge channel (61) to abut against the connecting port (62) and block the connecting port (62). An oil discharge spring (64) is fixedly connected between the mounting ball (63) and the inner wall of the oil discharge channel (61). The push rod (72) enters the oil discharge channel (61) under the elastic force of the mounting spring (73) and pushes the mounting ball (63) away from the connecting port (62).

3. The downhole reservoir decompression and oil production separation device according to claim 2, characterized in that: The mounting block (71) has six push rods (72) on its periphery, and each push rod (72) is fixedly connected to the mounting block (71) with a mounting spring (73).

4. The downhole reservoir decompression and oil production separation device according to claim 3, characterized in that: The mounting block (71) has six mounting slots (711) on its periphery, and each mounting slot (711) is used to fix and connect the mounting spring (73).

5. The downhole reservoir decompression and oil production separation device according to claim 4, characterized in that: The push rod (72) has a guide groove (721) at one end near the mounting block (71), and the guide groove (721) is inserted into the mounting block (71).

6. The downhole reservoir decompression and oil production separation device according to claim 1, characterized in that: The seal (3) includes a plurality of sealing rings (31) installed on the outer wall of the adjusting section (21) and abutting against the inside of the sleeve (1).

7. A downhole reservoir decompression and oil production separation device according to claim 6, characterized in that: The outer wall of the adjustment section (21) is provided with multiple sealing grooves (211), one sealing ring (31) corresponds to one sealing groove (211), and the sealing ring (31) is engaged in the sealing groove (211).

8. The downhole reservoir decompression and oil production separation device according to claim 1, characterized in that: The one-way separation valve (5) includes a one-way channel (51) opened on the regulating section (21). The opening of the one-way channel (51) near the lower oil chamber (12) is provided with an oil inlet (52) with a diameter smaller than that of the one-way channel (51). The one-way channel (51) is provided with an regulating ball (53) with a diameter larger than that of the oil inlet (52). A one-way spring (54) is fixedly connected between the regulating ball (53) and the inner wall of the one-way channel (51). The regulating ball (53) is pressed against the oil inlet (52) by the force of the one-way spring (54) and blocks the oil inlet (52).

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