Downhole gas-liquid separation device and downhole collection equipment

Abstract

The present application belongs to the technical field of oil and gas exploitation, and discloses a downhole gas-liquid separation device and a downhole collection equipment. The present application provides a downhole gas-liquid separation device, which realizes the separation operation of the gas-liquid mixed fluid above the second annular chamber by means of the liquid-blocking separation assembly, and realizes the separation operation of the gas-liquid mixed fluid in the second annular chamber by the spiral separation unit and the gas-liquid separation auxiliary unit, that is, the liquid-blocking separation assembly and the spiral separation unit realize the effective separation of the gas-liquid mixed fluid in the first annular chamber, reduce the gas content entering the screw pump, improve the operation reliability and safety of the screw pump under the high gas content operation condition, and guarantee the operation efficiency of the screw pump. The present application also provides a downhole collection equipment, in which the screw pump is connected to the lower end of the oil pipe, which guarantees the effective gas-liquid separation space and improves the separation effectiveness and efficiency of the downhole gas-liquid separation device for the gas-liquid mixed fluid.

Description

Technical Field

[0001] This invention relates to the field of oil and gas extraction technology, and in particular to a downhole gas-liquid separation device and downhole acquisition equipment. Background Technology

[0002] Screw pumps drive fluid to rise in a spiral motion axially through the rotation of helical blades, and are widely used in high-efficiency oil well lifting and gas well drainage and gas production operations. However, under high gas content conditions, a large amount of gas entering the screw pump will reduce its pumping efficiency, prolong the lifting operation cycle, and the screw pump is prone to dry running, resulting in excessive torque and damage to the internal stator rubber, affecting the safe operation of the screw pump.

[0003] To improve the operational safety of screw pumps under high gas content conditions, some devices incorporate a guide shell on the outside of the pump. The gas-liquid two-phase media can separate by gravity as they flow through the guide shell, reducing the amount of gas entering the pump. However, this method has limited separation efficiency, and the external guide shell increases the device's outer diameter, making it more difficult to run into the well. Other devices incorporate an internal cyclone separation module, utilizing the cyclone effect to separate the gas-liquid two-phase media. However, under high gas content conditions, the flow field stability of the gas and liquid phases within the cyclone separation module is poor, resulting in low separation efficiency.

[0004] Therefore, there is an urgent need to propose a downhole gas-liquid separation device and downhole acquisition equipment to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a downhole gas-liquid separation device and downhole acquisition equipment, which can improve the gas-liquid separation effect of downhole gas-liquid mixtures, increase the gas-liquid separation efficiency, enhance the operational reliability and safety of screw pumps under high gas content operating conditions, and ensure the operational efficiency of screw pumps.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a downhole gas-liquid separation device, comprising:

[0008] The device body includes a casing and an oil pipe disposed inside the casing. The casing and the oil pipe form a first annular chamber. The lower end of the oil pipe is used to connect to a screw pump.

[0009] A gas-liquid separation auxiliary unit is provided in the first annular chamber. The gas-liquid separation auxiliary unit is provided with a second annular chamber and an exhaust channel. The bottom of the second annular chamber is provided with an outlet channel that can be connected to the liquid inlet of the screw pump. The exhaust channel is provided in the second annular chamber and is connected to the first annular chamber.

[0010] A liquid-blocking and separating assembly is disposed in the first annular chamber and located above the second annular chamber. The liquid-blocking and separating assembly includes a liquid-blocking unit and a venting unit. The liquid-blocking unit is used to intercept the oil above the second annular chamber, so that the oil falls back into the second annular chamber. The venting unit is disposed in the liquid-blocking unit, so that the gas above the second annular chamber can be discharged to the top of the first annular chamber through the venting unit.

[0011] The spiral separation unit is located in the second annular chamber. The spiral separation unit is used to adjust the flow direction of the gas-liquid mixture in the second annular chamber, so that the gas in the second annular chamber enters the upper part of the first annular chamber through the exhaust channel, and the oil in the second annular chamber can enter the inlet of the screw pump through the outlet channel.

[0012] Optionally, the liquid-blocking unit includes an oil interceptor and an oil collector. The oil collector is located below the oil interceptor. The oil interceptor has a conical liquid-blocking surface, and the oil collector has an inverted conical liquid-collecting surface. The conical liquid-blocking surface is used to intercept the oil above the second annular chamber, so that the oil falls back into the second annular chamber via the inverted conical liquid-collecting surface. The venting unit includes multiple first vent holes and multiple second vent holes. The multiple first vent holes are spaced apart on the conical liquid-blocking surface, and the multiple second vent holes are spaced apart on the inverted conical liquid-collecting surface.

[0013] Optionally, the fluid blocking unit includes at least two fluid blocking elements spaced apart along the axial direction of the oil pipe, each fluid blocking element having a clearance notch, and the clearance notches of adjacent fluid blocking elements being staggered along the axial direction of the oil pipe.

[0014] Optionally, the diameter of the first vent is smaller than the diameter of the second vent.

[0015] Optionally, the gas-liquid separation auxiliary unit includes an overflow pipe and a guide pipe disposed on the outer periphery of the overflow pipe. The overflow pipe is disposed on the outer periphery of the oil pipe, and the guide pipe and the overflow pipe form a second annular chamber. The side wall of the overflow pipe is provided with an exhaust channel that communicates with the first annular chamber. The liquid-blocking unit is located above the guide pipe and is detachably connected to the overflow pipe. The spiral separation unit is disposed on the outer wall of the overflow pipe.

[0016] Optionally, the liquid-blocking unit is threadedly connected to the overflow pipe.

[0017] Optionally, the overflow pipe is threaded to the oil pipe.

[0018] Optionally, the downhole gas-liquid separator also includes a limiting element located at the lower end of the tubing and rotatably connected to the screw pump.

[0019] Optionally, the downhole gas-liquid separator includes at least two liquid-blocking units, which are spaced apart along the axial direction of the tubing.

[0020] Secondly, the present invention also proposes a downhole acquisition device, including a screw pump and a downhole gas-liquid separation device as described above, wherein the screw pump is connected to the lower end of the tubing, and the inlet of the screw pump is connected to the outlet channel of the second annular chamber.

[0021] The beneficial effects of this invention are:

[0022] This invention proposes a downhole gas-liquid separation device. The casing and tubing form a first annular chamber. A gas-liquid separation auxiliary unit is disposed within the first annular chamber, and a second annular chamber is also disposed therewith. A liquid-blocking separation component is disposed above the second annular chamber, and a spiral separation unit is disposed within the second annular chamber. After the downhole gas-liquid mixture enters the first annular chamber, the gas-containing gas-liquid mixture rises above the oil-containing gas-liquid mixture. When it rises above the second annular chamber, the gas in the gas-containing gas-liquid mixture can be discharged to the upper part of the first annular chamber through the ventilation unit, while the oil contained therein falls into the second annular chamber due to the interception effect of the liquid-blocking unit. In other words, the separation of the gas-liquid mixture above the second annular chamber is achieved by means of the liquid-blocking separation component. After being intercepted by the liquid-blocking unit, the oil and the high-oil-content gas-liquid mixture enter the second annular chamber together under gravity. A spiral separation unit located within the second annular chamber regulates the flow direction of the gas-liquid mixture entering the second annular chamber. The gas inside the second annular chamber is discharged above the first annular chamber via the exhaust channel, and the oil inside the second annular chamber is transported to the tubing via the liquid outlet channel and the pumping effect of the screw pump. In other words, the spiral separation unit, in conjunction with the gas-liquid separation auxiliary unit, achieves the separation of the gas-liquid mixture inside the second annular chamber. By setting up the liquid-blocking separation component and the spiral separation unit, effective separation of the gas-liquid mixture inside the first annular chamber is achieved, improving the gas-liquid separation effect for downhole gas-liquid mixtures, reducing the gas content entering the screw pump, improving the operational reliability and safety of the screw pump under high-gas-content operating conditions, and ensuring the operating efficiency of the screw pump. Compared to existing technologies that only include a cyclone separation module, the addition of a liquid-blocking separation component enables preliminary gas-liquid separation of high-gas-content gas-liquid mixtures, reducing the gas content entering the spiral separation unit. This improves the flow field stability within the spiral separation unit and enhances gas-liquid separation efficiency. Compared to existing technologies with external guide shells, in this invention, the gas-liquid separation auxiliary unit, liquid-blocking separation component, and spiral separation unit are all located inside the first annular chamber. This achieves effective separation of the gas-liquid mixture without increasing the outer diameter of the device itself, reducing the difficulty of installing the downhole gas-liquid separation device.

[0023] This invention also proposes a downhole acquisition device, including a screw pump and a downhole gas-liquid separator as described above. The screw pump is connected to the lower end of the tubing, and its inlet is connected to the outlet channel of the second annular chamber. This structural arrangement allows the downhole gas-liquid separator to be positioned above the screw pump, ensuring effective gas-liquid separation space and improving its effectiveness and efficiency in separating gas-liquid mixtures. The screw pump's inlet connects to the outlet channel of the second annular chamber, allowing the oil separated by the downhole gas-liquid separator to be pumped to the surface space, achieving effective collection of downhole oil. The downhole gas-liquid separator effectively reduces the amount of gas entering the screw pump, minimizing the risk of dry running and damage, ensuring the pump's operating efficiency and smooth acquisition operations, and improving the reliability and safety of the screw pump under high gas content conditions. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the downhole gas-liquid separation device described in an embodiment of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the downhole gas-liquid separation device described in an embodiment of the present invention. Figure 2 ;

[0026] Figure 3 This is a partial structural schematic diagram of the downhole gas-liquid separation device described in an embodiment of the present invention;

[0027] Figure 4 This is an exploded view of the downhole gas-liquid separation device described in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the gas-liquid separation auxiliary unit and the spiral separation unit described in the embodiments of the present invention;

[0029] Figure 6 This is a cross-sectional view of the gas-liquid separation auxiliary unit and the spiral separation unit described in the embodiments of the present invention;

[0030] Figure 7 This is a schematic diagram of the overflow pipe and liquid-blocking separation assembly described in an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of the liquid-blocking and separating component described in an embodiment of the present invention. Figure 1 ;

[0032] Figure 9 This is a schematic diagram of the structure of the liquid-blocking and separating component described in an embodiment of the present invention. Figure 2 ;

[0033] Figure 10This is a schematic diagram of the structure of the liquid-blocking and separating component described in an embodiment of the present invention. Figure 3 ;

[0034] Figure 11 This is a schematic diagram of the structure of multiple oil collection components described in an embodiment of the present invention.

[0035] In the picture:

[0036] 100. Screw pump; 1. Device body; 11. Sleeve; 12. Oil pipe; 2. Gas-liquid separation auxiliary unit; 21. Exhaust channel; 22. Overflow pipe; 23. Guide pipe; 3. Liquid-blocking separation assembly; 31. Liquid-blocking unit; 311. Oil interception component; 3111. Conical liquid-blocking surface; 3112. Clearance notch; 312. Oil-collecting component; 3121. Inverted conical liquid-collecting surface; 32. Ventilation unit; 321. First vent; 322. Second vent; 4. Spiral separation unit; 5. Limiting component. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] like Figures 1 to 11 As shown, this embodiment provides a downhole gas-liquid separation device, including a device body 1, a gas-liquid separation auxiliary unit 2, a liquid-blocking separation component 3, and a spiral separation unit 4. The device body 1 includes a casing 11 and an oil pipe 12 disposed within the casing 11. The casing 11 and the oil pipe 12 form a first annular chamber. The lower end of the oil pipe 12 is used to connect to a screw pump 100. The gas-liquid separation auxiliary unit 2 is disposed within the first annular chamber and includes a second annular chamber and an exhaust channel 21. The bottom of the second annular chamber has an outlet channel that communicates with the inlet of the screw pump 100. The exhaust channel 21 is disposed within the second annular chamber and communicates with the first annular chamber. The liquid-blocking separation component 3 is disposed within the first annular chamber. Within an annular chamber and above a second annular chamber, the liquid-blocking separation assembly 3 includes a liquid-blocking unit 31 and a venting unit 32. The liquid-blocking unit 31 intercepts the oil above the second annular chamber, causing the oil to fall back into the second annular chamber. The venting unit 32 is located within the liquid-blocking unit 31, allowing gas above the second annular chamber to be discharged to the top of the first annular chamber via the venting unit 32. A spiral separation unit 4 is located within the second annular chamber. The spiral separation unit 4 adjusts the flow direction of the gas-liquid mixture within the second annular chamber, allowing gas in the second annular chamber to enter the top of the first annular chamber via the exhaust channel 21, and allowing oil in the second annular chamber to enter the inlet of the screw pump 100 via the liquid outlet channel. It is understood that the liquid outlet channel of the second annular chamber is not connected to the first annular chamber to prevent unseparated gas-liquid mixture in the first annular chamber from directly entering the inlet of the screw pump 100 via the liquid outlet channel.

[0042] In this embodiment, the casing 11 and the tubing 12 form a first annular chamber. The gas-liquid separation auxiliary unit 2 is disposed in the first annular chamber and a second annular chamber is disposed therein. The liquid-blocking separation component 3 is disposed above the second annular chamber, and the spiral separation unit 4 is disposed in the second annular chamber. After the downhole gas-liquid mixture enters the first annular chamber, the gas-containing gas-liquid mixture will rise above the oil-containing gas-liquid mixture. When it rises above the second annular chamber, the gas in the gas-containing gas-liquid mixture can be discharged to the upper part of the first annular chamber through the ventilation unit 32, while the oil will fall into the second annular chamber under the interception of the liquid-blocking unit 31. That is, the separation operation of the gas-liquid mixture above the second annular chamber is achieved by means of the liquid-blocking separation component 3. After being intercepted by the liquid-blocking unit 31, the oil and the high-oil-content gas-liquid mixture enter the second annular chamber together under gravity. The spiral separation unit 4 can adjust the flow direction of the gas-liquid mixture entering the second annular chamber. The gas inside the second annular chamber is discharged above the first annular chamber via the exhaust channel 21, and the oil in the second annular chamber is transported to the tubing 12 via the liquid outlet channel and the pumping effect of the screw pump 100. In other words, the spiral separation unit 4, in conjunction with the gas-liquid separation auxiliary unit 2, achieves the separation of the gas-liquid mixture inside the second annular chamber. By setting up the liquid-blocking separation component 3 and the spiral separation unit 4, effective separation of the gas-liquid mixture entering the first annular chamber is achieved, improving the gas-liquid separation effect of the downhole gas-liquid mixture, reducing the gas content entering the screw pump 100, improving the operational reliability and safety of the screw pump 100 under high-gas-content operating conditions, and ensuring the operating efficiency of the screw pump 100. Compared to existing technologies that only include a cyclone separation module, the addition of a liquid-blocking separation component 3 achieves preliminary gas-liquid separation of the high-gas-content gas-liquid mixture, reducing the gas content entering the spiral separation unit 4. This improves the flow field stability within the spiral separation unit 4 and enhances the gas-liquid separation efficiency. Furthermore, the gas-liquid separation auxiliary unit 2, the liquid-blocking separation component 3, and the spiral separation unit 4 are all located inside the first annular chamber. Compared to the external guide shell in existing technologies, this achieves effective separation of the gas-liquid mixture without increasing the outer diameter of the device body 1, reducing the difficulty of installing the downhole gas-liquid separation device.

[0043] Optionally, the spiral separation unit 4 is a spiral blade. After the oil and the oil-containing gas-liquid mixture intercepted by the liquid-blocking unit 31 flow into the second annular chamber, a swirling flow will be generated under the guiding action of the spiral blade, so that the gas accumulates in the central area of ​​the second annular chamber, and the oil is thrown towards the inner wall of the second annular chamber near the first annular chamber, so that the gas can be discharged from the exhaust channel 21 to the top of the first annular chamber, and the oil enters the inlet of the screw pump 100 from the liquid outlet channel, thereby realizing the separation of the gas-liquid mixture inside the second annular chamber by the spiral separation unit 4.

[0044] For example, such as Figure 1 and Figure 4 As shown, the downhole gas-liquid separation device also includes a limiting component 5, which is located at the lower end of the tubing 12 and rotatably connected to the screw pump 100. The limiting component 5, rotatably connected to the screw pump 100, restricts the displacement of the screw pump 100 along the axial direction of the tubing 12 during suction operations, ensuring the positional accuracy of the screw pump 100 and improving its operational safety and reliability.

[0045] Optionally, such as Figures 2 to 6 As shown, the gas-liquid separation auxiliary unit 2 includes an overflow pipe 22 and a guide pipe 23 disposed on the outer periphery of the overflow pipe 22. The overflow pipe 22 is disposed on the outer periphery of the oil pipe 12. The guide pipe 23 and the overflow pipe 22 form a second annular chamber. The side wall of the overflow pipe 22 is provided with an exhaust channel 21 that communicates with the first annular chamber. The liquid blocking unit 31 is located above the guide pipe 23 and is detachably connected to the overflow pipe 22. The spiral separation unit 4 is disposed on the outer wall of the overflow pipe 22. The above structural design ensures that the gas-liquid mixture entering the second annular chamber undergoes gas-liquid separation under the swirling effect of the spiral separation unit 4. This facilitates gas accumulation on the wall of the overflow pipe 22, which then ascends through the exhaust channel 21 and the chamber formed by the overflow pipe 22 and the oil pipe 12 to the top of the first annular chamber before being discharged. The oil, on the other hand, is thrown against the wall of the guide pipe 23 and enters the inlet of the screw pump 100 through the outlet channel. This improves the separation effect of the gas-liquid mixture in the second annular chamber, ensuring the operational safety of the screw pump 100, and also achieves effective oil collection, increasing collection efficiency and accuracy. The detachable connection between the liquid-blocking unit 31 and the overflow pipe 22 allows for independent maintenance and replacement, reducing the difficulty of maintenance and disassembly.

[0046] In this embodiment, the liquid blocking unit 31 is threadedly connected to the overflow pipe 22, which not only makes it convenient to disassemble and assemble the two, reducing the independent maintenance cost of the two, but also ensures the connection strength and connection stability between the liquid blocking unit 31 and the overflow pipe 22, thereby improving the liquid blocking reliability of the liquid blocking unit 31.

[0047] In other embodiments, the liquid-blocking unit 31 can also be connected to the overflow pipe 22 by means of a snap-fit, which reduces the processing difficulty and processing cost of the liquid-blocking unit 31 and the overflow pipe 22, and improves the connection convenience between the two.

[0048] Optionally, the overflow pipe 22 is threaded to the oil pipe 12, which reduces the cost of independent maintenance and replacement of the overflow pipe 22 and the oil pipe 12, reduces the difficulty of disassembling and assembling the overflow pipe 22 and the oil pipe 12, and improves the connection strength and reliability of the overflow pipe 22 and the oil pipe 12.

[0049] Specifically, such as Figure 4 as well as Figures 7 to 10 As shown, the liquid blocking unit 31 includes an oil interceptor 311 and an oil collector 312. The oil collector 312 is disposed below the oil interceptor 311. The oil interceptor 311 is provided with a conical liquid blocking surface 3111, the diameter of which gradually increases from top to bottom. The oil collector 312 is provided with an inverted conical liquid collecting surface 3121, the diameter of which gradually decreases from top to bottom. The conical liquid blocking surface 3111 is used to intercept the oil above the second annular chamber, so that the oil falls back into the second annular chamber through the inverted conical liquid collecting surface 3121. The ventilation unit 32 includes a plurality of first ventilation holes 321 and a plurality of second ventilation holes 322. The plurality of first ventilation holes 321 are spaced apart on the conical liquid blocking surface 3111, and the plurality of second ventilation holes 322 are spaced apart on the inverted conical liquid collecting surface 3121. The conical liquid-blocking surface 3111 effectively intercepts the oil in the gas-liquid mixture above the second annular chamber, improving gas-liquid separation efficiency. Furthermore, the conical liquid-blocking surface 3111 guides the intercepted oil, facilitating its rapid descent under gravity along the conical liquid-blocking surface 3111 to the inverted conical liquid-gathering surface 3121. The inverted conical liquid-gathering surface 3121 effectively gathers the intercepted oil, increasing its efficiency in entering the second annular chamber, thereby shortening the overall separation cycle of the downhole gas-liquid separator and improving overall gas-liquid separation efficiency. The first vent 321 is located on the conical liquid-blocking surface 3111, enabling the simultaneous operation of the liquid-blocking process of the conical liquid-blocking surface 3111 and the gas ventilation process at the first vent 321. The second vent 322 is located on the inverted conical liquid-blocking surface 3111. The first vent 321 and the second vent 322 improve the reliability of gas separation. Setting multiple first vents 321 and second vents 322 improves the gas separation efficiency.

[0050] More specifically, the diameter of the first vent 321 is smaller than that of the second vent 322, so that the first vent 321 can perform secondary separation on the fluid flowing upward through the second vent 322, which facilitates further separation of gas and tiny oil droplets contained in the gas, and enhances the separation effect of the ventilation unit 32 on the gas above the second annular chamber.

[0051] Furthermore, a flow guiding structure is provided on the side of the conical liquid-blocking surface 3111 and the inverted conical liquid-gathering surface 3121 that are close to each other. The addition of the flow guiding structure can achieve the flow guiding effect of the oil flowing through the conical liquid-blocking surface 3111 and the inverted conical liquid-gathering surface 3121, improve the oil flow efficiency, and thus shorten the downhole gas-liquid separation operation cycle.

[0052] For example, the liquid-blocking unit 31 includes at least two oil intercepting members 311 spaced apart along the axial direction of the oil pipe 12. Each oil intercepting member 311 is provided with a clearance notch 3112. The clearance notches 3112 of adjacent oil intercepting members 311 are staggered along the axial direction of the oil pipe 12, that is, the projections of the clearance notches 3112 of adjacent oil intercepting members 311 onto an oil intercepting member 311 along the axial direction of the oil pipe 12 do not coincide. The liquid-blocking unit 31 includes at least two oil intercepting members 311, which improves the interception effect of the liquid-blocking unit 31 on the oil in the gas-liquid mixture above the second annular chamber. The clearance notch 3112 of each oil intercepting member 311 reduces the impact effect of the gas-liquid mixture on the oil intercepting member 311 when it rises, thus extending the service life of the oil intercepting member 311. The clearance notches 3112 of adjacent oil interceptors 311 are staggered along the axial direction of the oil pipe 12, so that at least two oil interceptors 311 enhance the interception effect of oil above the second annular chamber while ensuring their own lifespan, thus improving the reliability of the liquid-blocking separation assembly 3 in separating the gas-liquid mixture above the second annular chamber. Figure 4 and Figure 11 As shown, the liquid-blocking unit 31 may also include at least two oil-collecting members 312 arranged axially along the oil pipe 12 to enhance the collection effect of the intercepted oil above the second annular chamber.

[0053] Optionally, the downhole gas-liquid separator includes at least two liquid-blocking units 31, which are spaced apart along the axial direction of the tubing 12. The inclusion of at least two liquid-blocking units 31 further improves the reliability of the liquid-blocking separation assembly 3 in intercepting oil above the second annular chamber, enhancing the versatility of the downhole gas-liquid separator for high-production oil wells.

[0054] This embodiment also proposes a downhole acquisition device, including a screw pump 100 and a downhole gas-liquid separator as described above. The screw pump 100 is connected to the lower end of the tubing 12, and the inlet of the screw pump 100 is connected to the outlet channel of the second annular chamber. This structural arrangement allows the downhole gas-liquid separator to be positioned above the screw pump 100, ensuring effective gas-liquid separation space and improving the effectiveness and efficiency of separating the gas-liquid mixture. The inlet of the screw pump 100 is connected to the outlet channel of the second annular chamber, allowing the oil separated by the downhole gas-liquid separator to be pumped up to the surface space by the screw pump 100, thus achieving effective collection of the downhole oil. The installation of a downhole gas-liquid separator effectively reduces the amount of gas entering the screw pump 100, thereby reducing the risk of dry running and damage to the screw pump 100, ensuring the operating efficiency of the screw pump 100 and the smooth progress of data collection operations, and improving the operational reliability and safety of the screw pump 100 under high gas content operating conditions.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A downhole gas-liquid separation device, characterized in that, include: The device body (1) includes a casing (11) and an oil pipe (12) disposed in the casing (11). The casing (11) and the oil pipe (12) form a first annular chamber. The lower end of the oil pipe (12) is used to connect to a screw pump (100). A gas-liquid separation auxiliary unit (2) is provided in the first annular chamber. The gas-liquid separation auxiliary unit (2) is provided with a second annular chamber and an exhaust channel (21). The bottom of the second annular chamber is provided with an outlet channel that can be connected to the inlet of the screw pump (100). The exhaust channel (21) is provided in the second annular chamber and is connected to the first annular chamber. A liquid-blocking separation component (3) is disposed in the first annular chamber and located above the second annular chamber. The liquid-blocking separation component (3) includes a liquid-blocking unit (31) and a venting unit (32). The liquid-blocking unit (31) is used to intercept the oil above the second annular chamber, so that the oil falls back into the second annular chamber. The venting unit (32) is disposed in the liquid-blocking unit (31), and the gas above the second annular chamber can be discharged to the top of the first annular chamber through the venting unit (32). A spiral separation unit (4) is disposed in the second annular chamber. The spiral separation unit (4) is used to adjust the flow direction of the gas-liquid mixture in the second annular chamber, so that the gas in the second annular chamber enters the upper part of the first annular chamber through the exhaust channel (21), and the oil in the second annular chamber can enter the inlet of the screw pump (100) through the liquid outlet channel.

2. The downhole gas-liquid separation device according to claim 1, characterized in that, The liquid blocking unit (31) includes an oil interceptor (311) and an oil collector (312). The oil collector (312) is disposed below the oil interceptor (311). The oil interceptor (311) is provided with a conical liquid blocking surface (3111), and the oil collector (312) is provided with an inverted conical liquid collecting surface (3121). The conical liquid blocking surface (3111) is used to intercept the oil above the second annular chamber, so that the oil falls back into the second annular chamber through the inverted conical liquid collecting surface (3121). The ventilation unit (32) includes a plurality of first ventilation holes (321) and a plurality of second ventilation holes (322). The plurality of first ventilation holes (321) are spaced apart from the conical liquid blocking surface (3111), and the plurality of second ventilation holes (322) are spaced apart from the inverted conical liquid collecting surface (3121).

3. The downhole gas-liquid separation device according to claim 2, characterized in that, The liquid blocking unit (31) includes at least two oil interceptors (311) spaced apart along the axial direction of the oil pipe (12), each of the oil interceptors (311) being provided with a clearance notch (3112), and the clearance notches (3112) of adjacent oil interceptors (311) being staggered along the axial direction of the oil pipe (12).

4. The downhole gas-liquid separation device according to claim 2, characterized in that, The diameter of the first vent (321) is smaller than the diameter of the second vent (322).

5. The downhole gas-liquid separation device according to claim 1, characterized in that, The gas-liquid separation auxiliary unit (2) includes an overflow pipe (22) and a guide pipe (23) disposed on the outer periphery of the overflow pipe (22). The overflow pipe (22) is disposed on the outer periphery of the oil pipe (12). The guide pipe (23) and the overflow pipe (22) form a second annular chamber. The side wall of the overflow pipe (22) is provided with an exhaust channel (21) that communicates with the first annular chamber. The liquid-blocking unit (31) is located above the guide pipe (23) and is detachably connected to the overflow pipe (22). The spiral separation unit (4) is disposed on the outer wall of the overflow pipe (22).

6. The downhole gas-liquid separation device according to claim 5, characterized in that, The liquid-blocking unit (31) is threadedly connected to the overflow pipe (22).

7. The downhole gas-liquid separation device according to claim 5, characterized in that, The overflow pipe (22) is threadedly connected to the oil pipe (12).

8. The downhole gas-liquid separation device according to any one of claims 1-7, characterized in that, The downhole gas-liquid separation device also includes a limiting member (5), which is located at the lower end of the oil pipe (12) and is rotatably connected to the screw pump (100).

9. The downhole gas-liquid separation device according to any one of claims 1-7, characterized in that, The downhole gas-liquid separation device includes at least two liquid-blocking units (31), which are spaced apart along the axial direction of the tubing (12).

10. Downhole data acquisition equipment, characterized in that, Includes a screw pump (100) and a downhole gas-liquid separation device as described in any one of claims 1-9, wherein the screw pump (100) is connected to the lower end of the tubing (12), and the inlet of the screw pump (100) is connected to the outlet channel of the second annular chamber.

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