A nested umbrella-shaped downhole oil-water separator

Abstract

The present invention discloses a nested umbrella-shaped downhole oil-water separator, which relates to the field of downhole oil production tools and includes a centrifugal component for separating the mixed oil and water layers; an oil-water separation component for separating the stratified oil and water; a water pressure control component, which includes an inner water isolation sleeve, a piston tube sleeved on the inner water isolation sleeve, a connecting sleeve sleeved on the piston tube, and an umbrella-shaped inner sleeve installed at one end of the connecting sleeve; a plurality of oil-water extraction ports are opened on the side wall of the umbrella-shaped inner sleeve, a first contact surface is provided on the umbrella-shaped inner sleeve inside the oil-water extraction port, and a second contact surface matching the first contact surface is provided at one end of the piston tube close to the umbrella-shaped inner sleeve; the water pressure control component includes an open state and a closed state. The separated water phase pushes the piston tube to move towards the umbrella-shaped inner sleeve. When in the open state, the first contact surface and the second contact surface do not contact, and the oil and water can be discharged from the oil-water extraction port; when in the closed state, the first contact surface and the second contact surface contact, and the umbrella-shaped inner sleeve closes one end of the piston tube, and the oil and water cannot be discharged from the oil-water extraction port; to solve the problems of poor oil-water separation effect and low efficiency of the downhole oil-water separator in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of downhole oil production tools, and in particular, to a nested umbrella-shaped downhole oil-water separator. Background Art

[0002] At present, most domestic oil fields have entered the middle and late stages of exploitation. The water content in the wells has increased, resulting in a gradual increase in the water cut in the produced fluids of oil wells. In some oil fields, it often exceeds 90%. Therefore, during the production process of oil fields, a large amount of oil-water mixture will be generated, and the oil-water separation process occupies an important position.

[0003] The oil-water separator is a commonly used device for treating oil-water with a high water content. Its main function is to improve production efficiency by separating the water phase from the oil-water. However, in the analysis and research of current oil-water separators, it is found that the surface oil-water separator, although having good separation effect, has problems of large floor area and high investment cost. For traditional downhole oil-water separators, due to the narrow working scenario and the inability to use large equipment, the oil-water separation function of downhole oil-water separators is weak, the separation effect is poor, and the efficiency is low. Summary of the Invention

[0004] The present invention provides a nested umbrella-shaped downhole oil-water separator to solve the problems of poor oil-water separation effect and low efficiency of downhole oil-water separators in the prior art.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a nested umbrella-shaped downhole oil-water separator, comprising:

[0007] A centrifugal component for stratifying the mixed oil and water;

[0008] An oil-water separation component for separating the stratified oil and water;

[0009] A water pressure control component, including an inner water isolation sleeve, a piston tube sleeved on the inner water isolation sleeve, a connecting sleeve sleeved on the piston tube, and an umbrella-shaped inner sleeve installed at one end of the connecting sleeve;

[0010] A plurality of oil-water extraction ports are opened on the side wall of the umbrella-shaped inner sleeve. A first contact surface is provided on the umbrella-shaped inner sleeve inside the oil-water extraction port, and a second contact surface matching the first contact surface is provided at one end of the piston tube close to the umbrella-shaped inner sleeve;

[0011] The water pressure control component includes an open state and a closed state. The separated aqueous phase pushes the piston tube towards the umbrella-shaped inner sleeve. When in the open state, the first contact surface and the second contact surface are not in contact, and the oil and water can be discharged from the oil-water extraction port. When in the closed state, the first contact surface and the second contact surface are in contact, and the umbrella-shaped inner sleeve closes one end of the piston tube, and the oil and water cannot be discharged from the oil-water extraction port.

[0012] Since most oil fields are in the process of exploitation, the water content in the well varies greatly and shows a gradually increasing trend, resulting in a gradual increase in the water cut in the produced fluid of the oil well. The present invention drives the piston tube to move by the water separated from the oil and water to open or close the inner water isolation sleeve for transporting the oil and water, so as to achieve the purpose of extracting the oil and water according to the amount of water, avoid extracting the oil and water with a high water content, improve the oil-water separation effect, avoid secondary extraction, and improve the separation efficiency.

[0013] Further, an outer water outlet sleeve is installed at one end of the connecting sleeve away from the umbrella-shaped inner sleeve. A circular ring is provided on the outer side wall of the piston tube, a limiting ring is provided on the inner side wall of the connecting sleeve, a reset elastic member is provided between the circular ring and the limiting ring, and a limiting elastic member is provided between the lower end of the outer water outlet sleeve and the circular ring.

[0014] When the aqueous phase pushes the piston tube to fit with the umbrella-shaped inner sleeve, the aqueous phase is in the discharge state. When the thrust generated by the aqueous phase decreases, since the piston tube cannot be quickly reset, it will lead to a decrease in the extraction efficiency of the oil-water separator, and even cause the oil and water to overflow from the outlet of the aqueous phase. Therefore, a reset elastic member is used to provide a restoring force for the piston tube to quickly reset the piston tube when the thrust generated by the aqueous phase is small, to prevent the inner water isolation sleeve from being blocked by the umbrella-shaped inner sleeve. The limiting elastic member is used to limit the moving distance of the piston tube during reset, so that the initial position of the piston tube is located at the position where the thrusts generated by the limiting elastic member and the reset elastic member are equal; and under the thrust of the aqueous phase, a force balance is achieved with the forces generated by the limiting elastic member and the reset elastic member, so that the greater the thrust of the aqueous phase, the farther the piston tube moves towards the umbrella-shaped inner sleeve, the greater the water output of the aqueous phase, and the faster the thrust of the aqueous phase decreases, so as to achieve a stable process of extracting oil and water, and reduce the influence of factors such as liquid flow rate, liquid flow rate mutation, water content, and water content mutation on the extraction process.

[0015] Further, a plurality of drain holes are formed in the side wall of the outer water outlet sleeve. The water pressure control component further includes an initial state. When there is no aqueous phase pushing the piston tube, both the reset elastic member and the limiting elastic member are in the initial state. At this time, the circular ring is located on the side of the drain hole away from the umbrella-shaped inner sleeve.

[0016] Push the piston tube through the aqueous phase, so that the drain hole is gradually connected to the area where the aqueous phase is located, and the aqueous phase is discharged from the drain hole. Moreover, the greater the thrust of the aqueous phase, the farther the ring on the piston tube moves, the more drain holes are connected to the area where the aqueous phase is located, and the greater the discharge speed of the aqueous phase from the drain hole.

[0017] Further, the oil-water separation assembly includes an oil-water separation tube, which is communicated with the inner water isolation sleeve, and a plurality of water separation holes are opened on the side wall of the oil-water separation tube.

[0018] Due to the density difference between the oil and water phases, under the action of centrifugal force and centripetal buoyancy, the water phase migrates towards the side wall to form an outer swirl flow, while the oil phase is forced to migrate towards the center to form an inner swirl flow. Through the action of the water separation holes and centrifugal force, the water phase in the outer swirl flow state is thrown out to achieve the purpose of separating the water phase and the oil phase.

[0019] Further, the diameter of the oil-water separation tube gradually decreases from the end far away from the inner water isolation sleeve towards the end close to the inner water isolation sleeve.

[0020] Through the change of the diameter of the oil-water separation tube, the fluid is accelerated when entering from the large-diameter end to the small-diameter end, which can supplement the energy loss during the fluid flow and provide power for subsequent separation.

[0021] Further, the water separation holes are spirally distributed along the side wall of the oil-water separation tube.

[0022] The spiral distribution direction of the wall of the water separation hole is consistent with the fluid swirl direction, which can improve the throwing efficiency of the water phase in the outer swirl flow state.

[0023] Further, the centrifugal assembly includes a spiral tube communicated with the oil-water separation tube, and a guide vane for guiding the water flow to rotate is arranged in the spiral tube.

[0024] The spiral tube changes the flowing fluid into a swirl state to generate centrifugal force. Without an additional centrifugal device, the structure is simple and the occupied space is small.

[0025] Further, the oil-water separation assembly further includes an inner water connection sleeve sleeved outside the oil-water separation tube. One end of the inner water connection sleeve is sleeved on the spiral tube, and the other end is embedded inside the outer water outlet sleeve. A plurality of water outlet holes are opened on the inner water connection sleeve embedded inside the outer water outlet sleeve.

[0026] The inner water connection sleeve converges and guides the water phase thrown out from the water separation holes, and flows through the water outlet holes to the area where the piston tube is located, so that the water phase can generate a thrust on the piston tube.

[0027] Further, a first sealing ring is provided on the inner side wall of the piston tube, and the first sealing ring fits against the outer side wall of the inner water isolation sleeve. A second sealing ring is provided inside the connecting sleeve, and the second sealing ring fits against the outer side wall of the piston tube.

[0028] The first sealing ring prevents the oil-water mixture inside the inner water isolation sleeve from flowing back into the piston tube. The second sealing ring prevents the oil-water mixture inside the inner water isolation sleeve from flowing back between the piston tube and the connecting sleeve, which may affect the movement of the piston tube.

[0029] Further, a plurality of drain ports are provided on the side wall of the piston tube.

[0030] During the process of the piston tube being pushed by the water phase, fluid may enter the piston tube, resulting in hindered movement of the piston tube. The drain ports can discharge the fluid inside the piston tube.

[0031] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0032] (1) The present invention drives the movement of the piston tube by the water separated from the oil-water mixture to open or close the inner water isolation sleeve for transporting the oil-water mixture, achieving the purpose of extracting the oil-water mixture according to the amount of water, avoiding the extraction of oil-water mixture with high water content, improving the effect of oil-water separation, avoiding secondary extraction, and improving the separation efficiency;

[0033] (2) The reset elastic member provides a restoring force for the piston tube to quickly reset the piston tube when the thrust generated by the water phase is small, avoiding the continuous blockage of the inner water isolation sleeve by the umbrella-shaped inner sleeve. The limit elastic member is used to limit the moving distance of the piston tube during reset, so that the initial position of the piston tube is at the position where the thrusts generated by the limit elastic member and the reset elastic member are equal; and under the thrust of the water phase, a force balance is achieved with the forces generated by the limit elastic member and the reset elastic member, so that the greater the thrust of the water phase, the farther the piston tube moves towards the umbrella-shaped inner sleeve, the greater the water output of the water phase, and the faster the thrust of the water phase decreases, thereby achieving a stable process of extracting the oil-water mixture and reducing the influence of factors such as liquid flow rate, liquid flow rate mutation, water content, and water content mutation on the extraction process;

[0034] (3) By the amount of water content in the mixture, it affects the magnitude of the driving force of the water phase on the piston tube, thereby adjusting the position of the piston tube, and further adjusting the number of drain holes. It can not only adjust the discharge rate of the water phase, but also adjust the distance between the piston tube and the umbrella-shaped inner sleeve, thereby adjusting the extraction rate of the oil phase, and even preventing the extraction of the oil phase, reducing the extraction of the oil phase that fails to meet the extraction standard;

[0035] (4) The oil-water separator in the present invention can directly perform oil-water separation underground, reducing the waste of ground space and the investment in labor costs;

[0036] (5) By nesting components such as an annular piston, an inner water sleeve, and an outer water outlet sleeve in a hierarchical connection manner, the narrow underground pipelines can be effectively utilized, improving the space utilization efficiency. Description of the Drawings

[0037] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of the present invention, and do not limit the embodiments of the present invention;

[0038] Figure 1 is a cross-sectional view of the overall structure of the oil-water separator in the present invention;

[0039] Figure 2 is a schematic diagram of the umbrella-shaped inner sleeve structure in the present invention;

[0040] Figure 3 is a schematic diagram of the piston tube structure in the present invention;

[0041] Figure 4 is a cross-sectional view of the connecting sleeve in the present invention;

[0042] Figure 5 is a schematic diagram of the outer water outlet sleeve structure in the present invention;

[0043] Figure 6 is a schematic diagram of the oil-water separation tube structure in the present invention;

[0044] Figure 7 is a schematic diagram of the inner water sleeve structure in the present invention;

[0045] Wherein, 1 - inner water isolation sleeve, 2 - piston tube, 201 - second contact surface, 202 - circular ring, 203 - first sealing ring, 204 - drain port, 3 - connecting sleeve, 301 - limit ring, 302 - second sealing ring, 4 - umbrella-shaped inner sleeve, 401 - oil-water extraction port, 402 - first contact surface, 5 - outer water outlet sleeve, 501 - drain hole, 6 - reset elastic member, 7 - limit elastic member, 8 - oil-water separation tube, 801 - water separation hole, 9 - spiral tube, 901 - guide vane, 10 - inner water sleeve, 1001 - water outlet. Detailed Embodiments

[0046] In order to more clearly understand the above-mentioned objects, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein, and thus, the scope of protection of the present invention is not limited by the specific embodiments disclosed below.

[0048] Embodiment 1

[0049] This embodiment provides a nested umbrella-shaped downhole oil-water separator, as Figures 1-7 shown, including:

[0050] A centrifugal component for separating the mixed oil and water into layers;

[0051] An oil-water separation component for separating the oil and water after stratification;

[0052] A water pressure control component, including an inner water isolation sleeve 1, a piston tube 2 sleeved on the inner water isolation sleeve 1, a connecting sleeve 3 sleeved on the piston tube 2, and an umbrella-shaped inner sleeve 4 installed at one end of the connecting sleeve 3;

[0053] A plurality of oil and water extraction ports 401 are provided on the side wall of the umbrella-shaped inner sleeve 4. A first contact surface 402 is provided on the umbrella-shaped inner sleeve 4 inside the oil and water extraction port 401. One end of the piston tube 2 close to the umbrella-shaped inner sleeve 4 is provided with a second contact surface 201 matching the first contact surface 402;

[0054] The water pressure control component includes an open state and a closed state. The separated water phase pushes the piston tube 2 to move towards the umbrella-shaped inner sleeve 4. When in the open state, the first contact surface 402 and the second contact surface 201 are not in contact, and oil and water can be discharged from the oil and water extraction port 401; when in the closed state, the first contact surface 402 and the second contact surface 201 are in contact, and the umbrella-shaped inner sleeve 4 closes one end of the piston tube 2, and oil and water cannot be discharged from the oil and water extraction port 401.

[0055] Among them, the inner water isolation sleeve 1, the piston tube 2, the connecting sleeve 3 and the umbrella-shaped inner sleeve 4 are coaxially installed. The umbrella-shaped inner sleeve 4 is in the shape of an umbrella or a conical barrel, with a closed top and an open bottom. Preferably, two or more oil and water extraction ports 401 are provided, which are evenly distributed annularly around the side wall of the umbrella-shaped inner sleeve 4. The part of the oil and water extraction port 401 from the top of the umbrella-shaped inner sleeve 4 is closed, and the inner surface is the first contact surface 402. The side wall of the umbrella-shaped inner sleeve 4 is an inclined arc surface. Therefore, the second contact surface 201 on the piston tube 2 matching it is also an inclined arc surface. When the first contact surface 402 and the second contact surface 201 are attached, it is necessary to prevent oil and water from passing through. Therefore, it is preferable to provide waterproof materials such as rubber and silica gel on the surface of the second contact surface 201.

[0056] In a more preferred embodiment, an outer water outlet sleeve 5 is installed at one end of the connecting sleeve 3 away from the umbrella-shaped inner sleeve 4. A circular ring 202 is provided on the outer side wall of the piston tube 2, and a limiting ring 301 is provided on the inner side wall of the connecting sleeve 3. A reset elastic member 6 is provided between the circular ring 202 and the limiting ring 301. A limiting elastic member 7 is provided between the lower end of the outer water outlet sleeve 5 and the circular ring 202.

[0057] Among them, the outer water outlet sleeve 5 and the connecting sleeve 3 are coaxial, preferably threadedly connected for easy installation. The outer diameter of the circular ring 202 is equal to the inner diameter of the outer water outlet sleeve 5, and the inner diameter of the limiting ring 301 is equal to the outer diameter of the piston tube 2, providing a certain sealing effect. A groove is provided at the lower end inside the outer water outlet sleeve 5 for embedding the limiting elastic member 7. The reset elastic member 6 and the limiting elastic member 7 are both preferably thrust springs. After the connecting sleeve 3, the outer water outlet sleeve 5, the piston tube 2, the reset elastic member 6, and the limiting elastic member 7 are installed, the reset elastic member 6 and the limiting elastic member 7 are in a compressed state.

[0058] In a more preferred embodiment, a plurality of drain holes 501 are provided on the side wall of the outer water outlet sleeve 5. The water pressure control assembly further includes an initial state. When there is no water phase to push the piston tube 2, both the reset elastic member 6 and the limiting elastic member 7 are in the initial state. At this time, the circular ring 202 is located on the side of the drain holes 501 away from the umbrella-shaped inner sleeve 4.

[0059] Among them, after the connecting sleeve 3, the outer water outlet sleeve 5, and the piston tube 2 are installed, a cavity is formed between the connecting sleeve 3, the outer water outlet sleeve 5, and the piston tube 2. The cavity is divided into two parts by the circular ring 202. The cavity for accommodating the reset elastic member 6 is the circular ring movable area, and the cavity for accommodating the limiting elastic member 7 is the water pressure area. In the initial state, the drain holes 501 are all located on the side wall of the outer water outlet sleeve 5 in the circular ring movable area. As the water phase enters the water pressure area, it pushes the circular ring 202 to move towards the circular ring movable area direction. The water pressure area gradually becomes longer, and the drain holes 501 gradually enter the water pressure area, and the water phase in the water pressure area can be discharged from the drain holes 501.

[0060] In a more preferred embodiment, the oil-water separation assembly includes an oil-water separation tube 8. The oil-water separation tube 8 is communicated with the inner water isolation sleeve 1. A plurality of water separation holes 801 are provided on the side wall of the oil-water separation tube 8. The inner diameters at the connection between the oil-water separation tube 8 and the inner water isolation sleeve 1 are equal. The number of the water separation holes 801 is arbitrary and is evenly distributed along the side wall of the oil-water separation tube 8.

[0061] In a more preferred embodiment, the diameter of the oil-water separation tube 8 gradually decreases from the end away from the inner water isolation sleeve 1 towards the end close to the inner water isolation sleeve 1. The oil-water separation tube 8 has a conical barrel structure.

[0062] In a more preferred embodiment, the water separation holes 801 are spirally distributed along the side wall of the oil-water separation tube 8. The spiral direction is the same as the rotation direction of the fluid in the oil-water separation tube 8.

[0063] In a more preferred embodiment, a first sealing ring 203 is provided on the inner side wall of the piston tube 2, and the first sealing ring 203 is in contact with the outer side wall of the inner water isolation sleeve 1. A second sealing ring 302 is provided inside the connecting sleeve 3, and the second sealing ring 302 is in contact with the outer side wall of the piston tube 2.

[0064] In a more preferred embodiment, a plurality of drain ports 204 are formed on the side wall of the piston tube 2. The number of the drain ports 204 is arbitrary, and it can discharge the fluid infiltrating into the piston tube 2 into the circular ring activity area and then discharge it through the drain holes 501.

[0065] Embodiment 2

[0066] Based on Embodiment 1, as Figures 1-7 shown, the centrifugal component includes a spiral tube 9 communicated with the oil-water separation tube 8, and a guide vane 901 for guiding the water flow to rotate is arranged in the spiral tube 9.

[0067] Among them, the oil-water separation tube 8 and the spiral tube 9 are preferably threadedly connected. The inner diameter of the spiral tube 9 is equal to the inner diameter of the end of the oil-water separation tube 8 far from the inner water isolation sleeve 1. The guide vanes 901 are spirally distributed, and the spiral direction is the same as the spiral distribution direction of the water separation holes 801. In this device, the oil-water mixture is pumped into the spiral tube 9 by a pump, and the fluid direction is changed from linear motion to rotational motion through the guide vanes 901. Due to the density difference between the oil and water phases, under the action of centrifugal force and centripetal buoyancy, the water phase migrates towards the inner pipe wall to form an outer vortex flow, while the oil phase is forced to migrate towards the central region to form an inner vortex flow.

[0068] In a more preferred embodiment, the oil-water separation component further includes an inner water connection sleeve 10 sleeved outside the oil-water separation tube 8. One end of the inner water connection sleeve 10 is sleeved on the spiral tube 9, and the other end is embedded inside the outer water outlet sleeve 5. A plurality of water outlet holes 1001 are formed on the inner water connection sleeve 10 embedded inside the outer water outlet sleeve 5.

[0069] Among them, the inner diameter of the inner water connection sleeve 10 is larger than the maximum outer diameter of the oil-water separation tube 8. The cavity formed between the inner water connection sleeve 10 and the oil-water separation tube 8 is used to converge and guide the flow of the water phase, and then discharge it through the water outlet holes 1001 to the water pressure area to provide thrust for the piston tube 2.

[0070] In this solution, the separation of oil and water is related to the water content in the oil-water mixture. Specifically:

[0071] The oil-water mixture pumped into the oil-water separator passes through the spiral tube 9. The oil phase forms an inner swirl flow and is sent out through the inner water isolation sleeve 1, the umbrella-shaped inner sleeve 4, and the oil-water extraction port 401. The water phase forms an outer swirl flow, enters the inner water connection sleeve 10 through the water separation hole 801, and then enters the water pressure area through the water outlet 1001, pushing the piston tube 2 to move. The water phase is discharged through the drain hole 501 into the water pressure area;

[0072] Among them, the higher the water content in the oil-water mixture, the less the oil phase, the more the water phase, the greater the thrust of the water phase on the piston tube 2, the farther the piston tube 2 moves, the closer the piston tube 2 is to the umbrella-shaped inner sleeve 4, and the slower the oil phase extraction speed. This can reduce the unseparated water phase passing through the oil-water extraction port 401. At the same time, the more drain holes 501 entering the water pressure area, the faster the water phase is discharged through the drain hole 501, forming a relatively stable extraction process;

[0073] When the water content in the oil-water mixture is too high and reaches a certain limit, the oil phase is less, and the unseparated water phase is too much, failing to meet the oil phase extraction standard, resulting in poor oil-water separation effect. Therefore, it does not have the condition for oil phase extraction. At this time, due to the excessive water phase, the thrust of the water pressure area on the piston tube 2 reaches a certain threshold, and the piston tube 2 presses against the umbrella-shaped inner sleeve 4. The first contact surface 402 and the second contact surface 201 are in contact, blocking the inner water isolation sleeve 1 and the oil-water extraction port 401, preventing the fluid in the inner water isolation sleeve 1 that fails to meet the oil phase extraction standard from being extracted, ensuring the oil-water separation effect;

[0074] When a certain amount of water phase is discharged from the drain hole 501, the unseparated water phase in the oil phase decreases and reaches the extraction standard. At the same time, the thrust of the water pressure area on the piston tube 2 is lower than a certain threshold, and the reset elastic member 6 pushes the piston tube 2 away from the umbrella-shaped inner sleeve 4, and the oil phase can be extracted through the oil-water extraction port 401.

[0075] Among them, the "certain limit" of the water content, the "extraction standard" of the oil phase, the "certain threshold" of the thrust of the water pressure area on the piston tube 2, etc. are all determined according to the device structure, user requirements, etc., and are not specifically limited in this embodiment.

[0076] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0077] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A nested umbrella-shaped downhole oil-water separator, characterized in that: include: A centrifugal assembly for separating the mixed oil and water into separate layers; An oil-water separation component, used to separate the oil and water after stratification; A water pressure control assembly comprises an inner water-blocking sleeve (1), a piston tube (2) sleeved on the inner water-blocking sleeve (1), a connecting sleeve (3) sleeved on the piston tube (2), and an umbrella-shaped inner sleeve (4) installed at one end of the connecting sleeve (3), wherein the inner wall of the piston tube (2) and the outer wall of the inner water-blocking sleeve (1) are sealed, and the outer wall of the piston tube (2) and the inner wall of the connecting sleeve (3) are sealed; The oil-water separation assembly comprises an oil-water separation pipe (8) and an inner water-connecting sleeve (10) sleeved on the outside of the oil-water separation pipe (8), and the oil-water separation pipe (8) is in communication with the inner water-isolating sleeve (1); The centrifugal assembly comprises a spiral tube (9) connected to the oil-water separation tube (8); A plurality of oil-water extraction ports (401) are provided on the side wall of the umbrella-shaped inner sleeve (4); a first contact surface (402) is provided on the umbrella-shaped inner sleeve (4) inside the oil-water extraction port (401); and a second contact surface (201) matching the first contact surface (402) is provided at one end of the piston tube (2) close to the umbrella-shaped inner sleeve (4); The water pressure control component comprises an open state and a closed state. The separated water phase pushes the piston tube (2) to move toward the umbrella-shaped inner sleeve (4). When in the open state, the first contact surface (402) and the second contact surface (201) are not in contact, and oil and water can be discharged from the oil-water extraction port (401); when in the closed state, the first contact surface (402) and the second contact surface (201) are in contact, the umbrella-shaped inner sleeve (4) seals one end of the piston tube (2), and oil and water cannot be discharged from the oil-water extraction port (401); An outgoing water casing (5) is installed at one end of the connecting casing (3) away from the umbrella-shaped inner casing (4); a circular ring (202) is provided on the outer wall of the piston tube (2); a limiting ring (301) is provided on the inner wall of the connecting casing (3); a reset elastic member (6) is provided between the circular ring (202) and the limiting ring (301); a limiting elastic member (7) is provided at the lower end of the outgoing water casing (5) between the circular ring (202); a plurality of drainage holes (501) are provided on the side wall of the outgoing water casing (5); one end of the inner water casing (10) is sleeved on the spiral tube (9); and the other end is embedded in the inner side of the outgoing water casing (5).

2. A nested umbrella-shaped downhole oil-water separator according to claim 1, characterized in that: The water pressure control component also includes an initial state, when there is no water phase pushing the piston tube (2), the reset elastic member (6) and the limit elastic member (7) are both in the initial state, at which time the ring (202) is located on the side of the drainage hole (501) away from the umbrella-shaped inner sleeve (4).

3. The nested umbrella-shaped downhole oil-water separator according to claim 1, characterized in that: A plurality of water separation holes (801) are provided on the side wall of the oil-water separation tube (8).

4. A nested umbrella-shaped downhole oil-water separator according to claim 3, characterized in that: The diameter of the oil-water separation pipe (8) gradually decreases from an end away from the inner water-blocking sleeve (1) toward an end close to the inner water-blocking sleeve (1).

5. The nested umbrella-shaped downhole oil-water separator according to claim 3, characterized in that: The water separation holes (801) are distributed in a spiral along the side wall of the oil-water separation tube (8).

6. The nested umbrella-shaped downhole oil-water separator according to claim 3, characterized in that: The spiral tube (9) is provided with a guide blade (901) for guiding the rotation of water flow.

7. A nested umbrella-shaped downhole oil-water separator according to claim 6, characterized in that: A plurality of water outlets (1001) are provided on the inner water receiving sleeve (10) embedded inside the outer water receiving sleeve (5).

8. The nested umbrella-shaped downhole oil-water separator according to claim 1, characterized in that: A first sealing ring (203) is provided on the inner wall of the piston tube (2), and the first sealing ring (203) is in contact with the outer wall of the inner water-blocking sleeve (1). A second sealing ring (302) is provided on the inner side of the connecting sleeve (3), and the second sealing ring (302) is in contact with the outer wall of the piston tube (2).

9. The nested umbrella-shaped downhole oil-water separator according to claim 1, characterized in that: A plurality of drainage openings (204) are provided on the side wall of the piston tube (2).

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