Automatic sand-discharging downhole oil-water hydrocyclone separation assembly and device

Abstract

The present disclosure relates to an automatic sand-discharging downhole oil-water hydrocyclone separation assembly and device; the device has an outer hydrocyclone separation structure and an inner hydrocyclone self-adaptive sand-discharging structure; the outer hydrocyclone separation structure performs hydrocyclone separation on the mixed liquid composed of oil-water liquid phase and solid-phase sand through hydrocyclone separation, the solid phase is thrown to the side wall, and the liquid phase moves towards the axis for preliminary separation; connecting the outer pipe and the outer spiral flow channel plays a role in connecting and fixing the whole device and connecting the inner hydrocyclone self-adaptive sand-discharging structure; through the connection between the outer hydrocyclone separation structure and the inner hydrocyclone self-adaptive sand-discharging structure, the size of the gap between the impact baffle and the connecting outer pipe is automatically adjusted according to the size of the solid-phase flow rate to adapt to the solid-phase flow rate, and the treated liquid phase finally enters the inside of the hydrocyclone for liquid-phase separation. The separation device given in the present disclosure can realize automatic adjustment with the change of sand content, and reduces the influence on the separation efficiency of the hydrocyclone caused by the change of sand content.

Description

Technical Field

[0001] The present disclosure relates to the field of downhole injection and production in oil fields. Specifically, it relates to a hydrocyclone separation device that can achieve three-phase separation of oil, water, and sand underground in downhole injection and production processes. Background Art

[0002] The hydrocyclone as a whole has no moving parts and has a simple structure. It has the advantages of low equipment cost, easy disassembly and assembly, convenient maintenance, small floor area, low capital construction cost, high separation efficiency, etc., and has been widely used in multiple fields such as chemical industry, petroleum, electric power, environmental protection, metallurgy, water treatment, etc. In practical applications, many factors will have an adverse impact on the separation performance of the hydrocyclone. For example, the sand content in the produced fluid and the instability of the sand content will cause unstable separation of the hydrocyclone, resulting in low separation efficiency. Therefore, whether sand can be removed before oil-water separation and the problem of unstable sand content can be overcome have become the key steps to improve the performance of the hydrocyclone. In response to such problems, most of the existing technologies are to install active components in the hydrocyclone to break up the sand phase before separation, or to make the sand phase flow out through holes opened on the side wall of the hydrocyclone for separation. As shown in the published patent document with the patent name: A rainwater hydrocyclone sand remover with anti-blocking function, patent (application) number 202223239467.0, a crushing rod is installed at the underflow port to break up and separate the particles and prevent the sand phase from blocking the outlet. However, since this device adds active components, when applied underground, on the one hand, it is not easy to maintain, and it will also affect the stability of the flow field and the separation performance, and energy input is also required, resulting in an increase in separation costs. Summary of the Invention

[0003] The present disclosure proposes an automatic sand-discharging downhole oil-water hydrocyclone separation assembly and device, which can solve the problems of the existing technologies pointed out in the background art. The separation assembly and device given by the present disclosure can be automatically adjusted according to the change of sand content, so that when the sand content of the liquid to be treated increases or decreases, the hydrocyclone can increase or decrease its own sand discharge amount at the same time, thereby ensuring the stable operation of the hydrocyclone and having no impact on the separation efficiency. The technical solution given by the present disclosure can enhance the applicability of the hydrocyclone separation equipment to unstable sand content conditions, with stable separation efficiency and simple treatment process.

[0004] The automatic sand-discharging downhole oil-water hydrocyclone separation assembly described in the present disclosure includes the following basic solutions:

[0005] Basic Solution 1: The automatic sand-discharging downhole oil-water hydrocyclone separation assembly includes a hydrocyclone 5, and its unique feature is:

[0006] The cyclone is a hollow cylinder with unequal diameters, provided with a cyclone inlet, a cyclone liquid inlet hole 503, and a cyclone underflow port 509; at the cyclone inlet, a cyclone upper inner thread 501 and a cyclone upper outer thread 502 are provided; in the middle section of the cyclone, a cyclone disc-shaped convex platform 504 and a movable ring cylindrical track 506 are provided; at the lower end of the movable ring cylindrical track, a cylindrical track lower end thread 507 is provided, and in the cyclone underflow port, a cyclone underflow port thread 508 is provided.

[0007] Further, impact baffle fixing shafts 505 are provided on both sides of the cyclone disc-shaped convex platform 504;

[0008] The assembly further includes an inner impact baffle 9, an outer impact baffle 10, a push rod 11, a movable ring 12, a spring 13, and a spring fixing ring 14;

[0009] The impact baffle fixing shafts 505 pass through the inner impact baffle fixing holes 901 and the outer impact baffle fixing holes 1001 of the inner impact baffle 9 and the outer impact baffle 10 respectively, and finally pass through two pairs of inner and outer impact baffles on the impact baffle fixing shafts 505 on both sides, so that they can all rotate around the impact baffle fixing shafts within a certain range; the movable ring 12 and the spring 13 are both sleeved on the movable ring cylindrical track 506, so that the movable ring 12 and the spring 13 can move axially within a certain range on the movable ring cylindrical track; the cylindrical track lower end thread 507 and the fixing ring connection thread 1401 provided on the spring fixing ring 14 are connected together by threads;

[0010] The push rod baffle fixing shaft 1102 passes through the push rod connection hole 1004 to fix the outer impact baffle 10 and at the same time fix the inner and outer impact baffles so that they can move simultaneously;

[0011] The push rod 11 is provided with an anti-interference fillet to ensure that there is no mutual influence at the connection when the push rod 11 and the outer impact baffle 10 rotate relative to each other. The push rod baffle fixing shaft 1102 passes through the push rod connection hole 1004 to fix one end of the push rod, and the other end is connected together by bolts;

[0012] The movable ring 12 and the push rod 11 are connected through the movable ring fixing port 1103 and the fixing ear 1201 on the movable ring 12 and can rotate relative to each other within a certain range;

[0013] The fixing ring connection thread 1401 of the fixing ring 14 is fixed to the cylindrical track lower end thread 507 by threads; the fixing bolt 15 passes through the movable ring fixing port 1103 and the fixing ear 1201 to fix the two parts together so that the lower end of the push rod 11 can rotate relative to the fixing ring 14.

[0014] Furthermore, both the inner impact baffle 9 and the outer impact baffle 10 are quarter-circular ring structures. The fixed ends of the two baffles are fixed respectively by passing the impact baffle fixing shaft 505 through the inner impact baffle fixing hole 901 and the outer impact baffle fixing hole 1001; the inner impact baffle and the outer impact baffle on both sides of the impact baffle fixing shaft 505 adopt a concave-convex nested structure, and are respectively provided with an inner impact baffle anti-interference fillet 902 and an outer impact baffle anti-interference fillet 1002 to ensure that the inner impact baffle and the outer impact baffle do not interfere with each other when rotating;

[0015] The inner impact baffle connecting and fixing hole 903 is connected to the outer impact baffle 10 by inserting the outer impact baffle connecting piece 1003 into it, so that the inner impact baffle 9 and the outer impact baffle 10 are connected together and move simultaneously when the rotation angle is required. The other pair of inner and outer impact baffles has the same structure;

[0016] After the outer impact baffle connecting piece 1003 passes through the inner impact baffle connecting and fixing hole 903, it is fixed to the outer impact baffle 10 by passing the push rod baffle fixing shaft 1102 through the push rod connecting hole 1004, and at the same time, the inner and outer impact baffles are fixed so that they can move simultaneously.

[0017] Basic Solution 2: The cyclone separation assembly further includes an inverted cone 8; the inverted cone is composed of a cone and a frustum of a cone connected; on the outer wall of the frustum of the cone, there is a discontinuous threaded connecting body 802, and the discontinuous threaded connecting body can be connected to the cyclone underflow port thread 508, and an inverted cone annulus 801 is generated after connection.

[0018] Basic Solution 3: The cyclone separation assembly further includes a cyclone fixing structure 6, and the cyclone fixing structure 6 is a connecting and fixing part;

[0019] An overflow variable diameter port 602 is arranged inside the cyclone fixing structure, and the lowest end of the overflow variable diameter port is the cyclone fixing structure overflow port 605;

[0020] On the outer wall of the cyclone fixing structure, there are a cyclone fixing structure upper end thread 601 and a cyclone fixing structure lower end external thread 603; at the bottom end of the cyclone fixing structure, below the cyclone fixing structure overflow port, there is a concave annular space, and a cyclone fixing structure lower end internal thread 604 is arranged on the inner wall of the annular space;

[0021] The cyclone upper end internal thread 501 is threadedly connected to the cyclone fixing structure lower end external thread 603.

[0022] Basic solution 4: The cyclone separation component further includes an inner spiral flow channel 7. An annular flow channel 702 is provided on the outer wall of the inner spiral flow channel, and an inner spiral flow channel overflow port 703 penetrating the entire inner spiral flow channel is provided inside. A spiral flow channel upper end thread 701 is provided on the round table extending outward at the top end of the inner spiral flow channel 7; The lower end internal thread 604 of the cyclone fixing structure fits with the spiral flow channel upper end thread 701, enabling the inner spiral flow channel 7 to be threadedly connected inside the cyclone fixing structure 6. After connection, the inner spiral flow channel overflow port 703 communicates with the cyclone fixing structure overflow port 605.

[0023] Basic solution 5:

[0024] The cyclone separation component further includes an outer cyclone separation module; The outer cyclone separation module includes a connecting outer tube 3 and an outer spiral flow channel 4;

[0025] The connecting outer tube 3 is provided with a connecting outer tube upper end thread 301, a connecting outer tube liquid inlet 302, and a connecting outer tube liquid outlet 305. A sand settling inclined surface 304 is provided at the bottom end of the connecting outer tube, and a connecting outer tube sand phase outlet 303 is opened at the intersection of the sand settling inclined surface and the connecting outer tube wall;

[0026] The outer spiral flow channel 4 is cylindrical. An outer spiral flow channel fixing thread 401 is provided on the inner wall at the top end, and an outer spiral flow channel drainage channel 402 is provided on the outer wall of the outer spiral flow channel 4; The outer spiral flow channel fixing thread 401 is connected to the upper end external thread 502 of the cyclone. After connection, an inner annulus 404 is formed between the outer spiral flow channel 4 and the cyclone 5, and the inner annulus communicates with the cyclone liquid inlet hole;

[0027] The connecting outer tube upper end thread 301 is connected to the cyclone fixing structure upper end thread 601. After separation, the sand phase aggregates through the sand settling inclined surface 304 and flows out from the connecting outer tube sand phase outlet 303.

[0028] Further, the bottommost circle of the outer spiral flow channel drainage channel 402 is set as an outer spiral flow channel lower end chamfer 403, and the angle range is between 30 degrees and 80 degrees.

[0029] Another aspect of the application of the present disclosure lies in proposing an automatic sand discharging downhole oil-water cyclone separation device, which is characterized by applying at least two sets of the cyclone separation components described in basic solution 5, connecting the same cyclone separation components in series from top to bottom to form a separation device that can be connected to the downhole oil pipe to form a process string.

[0030] Further, the application in the present disclosure can be extended to an injection-production process string: Connecting the aforementioned automatic sand discharging downhole oil-water cyclone separation device in the process string.

[0031] The above at least one technical solution adopted by one or more embodiments of this specification can achieve the following beneficial effects:

[0032] First, the components and devices provided by the present disclosure are innovative in overall structure, and the vertical working mode can achieve the three-phase separation of oil, water, and sand from top to bottom.

[0033] Second, the upper part of the device is set as an external cyclone separation module. Entering the inside of this module can preliminarily pre-separate the mixed-phase medium and remove sand. The initial pre-separation of the mixed liquid is achieved by entering the external spiral flow channel. The sand phase is thrown to the side wall, avoiding the problem that the separation performance of the cyclone separator decreases due to the influence of the sand phase on the unstable flow field.

[0034] Third, the internal spiral flow self-adaptive sand discharge module in the cyclone. This module makes the mixed liquid reverse into the cyclone for oil-water separation by the impact of the mixed liquid on the disc-shaped convex platform and the impact baffle of the cyclone, and then changes the angle through the impact of the sand phase on the impact baffle to change the flow area, achieving the purpose of self-adaptation of the sand discharge port size to the sand content of the mixed liquid and oil-water cyclone separation, so that the sand discharge and cyclone separation efficiency tend to be stable under different sand content conditions.

[0035] In addition, the structure of this device is compact and neat, each part is easy to process, convenient to assemble, has high interchangeability, and the overall structure is connected to the outer pipe through threads, covering a small area, and the diameter is basically equal to the diameter of the connecting outer pipe, which is convenient for installation.

[0036] In summary, the device provided by the present disclosure integrates functions such as sand phase separation, sand removal self-adaptation, and oil-water cyclone separation. By changing the rotation angle of the sand phase impact baffle and the opening and closing angle, the self-adaptation of the sand discharge amount is realized. By the impact of the liquid flow on the disc-shaped convex platform of the cyclone and changing the flow direction, the oil-water cyclone separation is realized by entering the cyclone. Compared with the traditional cyclone sand removal and separation system, the device has a compact structure, no active moving parts, does not consume electric energy, and reduces environmental pollution.

[0037] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present disclosure.

[0038] According to the following detailed description of the exemplary embodiments with reference to the accompanying drawings, other features and aspects of the present disclosure will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification. These drawings show embodiments consistent with the present disclosure and are used together with the specification to explain the technical solutions of the present disclosure.

[0040] Figure 1 (a) is a perspective view a of the appearance of an automatic sand-discharging downhole oil-water cyclone separation component and device.

[0041] Figure 1 (b) is the perspective b of the appearance diagram of an automatic sand-discharging downhole oil-water cyclone separation component and device.

[0042] Figure 2 (a) is the diagram of the outer cyclone separation module.

[0043] Figure 2 (b) is the diagram of the inner cyclone self-adaptive sand-discharging module.

[0044] Figure 3 is the overall cross-sectional view of an automatic sand-discharging downhole oil-water cyclone separation component and device.

[0045] Figure 4 (a) is the structural diagram of the connecting outer pipe.

[0046] Figure 4 (b) is the structural diagram of the outer spiral flow channel.

[0047] Figure 5 is the cross-sectional view of the outer cyclone separation module.

[0048] Figure 6 is the overall appearance diagram of the inner cyclone self-adaptive sand-discharging module.

[0049] Figure 7 is the exploded view of the inner cyclone self-adaptive sand-discharging module.

[0050] Figure 8 is the cross-sectional view of the inner cyclone self-adaptive sand-discharging module.

[0051] Figure 9 is the structural diagram of the hydrocyclone.

[0052] Figure 10 (a) is the working condition diagram of the inner cyclone self-adaptive sand-discharging module with a small sand content.

[0053] Figure 10 (b) is the working condition diagram of the inner cyclone self-adaptive sand-discharging module with a large sand content.

[0054] Figure 11 is the structural diagram of the inner impact baffle.

[0055] Figure 12 is the structural diagram of the outer impact baffle.

[0056] Figure 13 is the structural diagram of the push rod.

[0057] Figure 14 is the structural diagram of the movable ring.

[0058] In the figure, 1 - external swirl separation structure, 2 - internal swirl self - adapting sand - discharging structure, 3 - connecting outer pipe, 301 - upper - end thread of the connecting outer pipe, 302 - liquid - inlet of the connecting outer pipe, 303 - sand - phase outlet of the connecting outer pipe, 304 - sand - settling inclined plane, 4 - external spiral flow channel, 401 - fixed thread of the external spiral flow channel, 402 - drainage channel of the external spiral flow channel, 403 - lower - end chamfer of the external spiral flow channel, 404 - annulus between cyclones of the external spiral flow channel, 5 - cyclone, 501 - internal thread at the upper end of the cyclone, 502 - external thread at the upper end of the cyclone, 503 - liquid - inlet hole of the cyclone, 504 - disc - shaped boss of the cyclone, 505 - fixed shaft for the impact baffle, 506 - cylindrical track of the movable ring, 507 - lower - end thread of the cylindrical track, 508 - bottom - flow port thread of the cyclone, 509 - bottom - flow port of the cyclone, 6 - cyclone fixing structure, 601 - upper - end thread of the cyclone fixing structure, 602 - variable - diameter overflow port, 603 - external thread at the lower end of the cyclone fixing structure, 604 - internal thread at the lower end of the cyclone fixing structure, 605 - overflow port of the cyclone fixing structure, 7 - internal spiral flow channel, 701 - upper - end thread of the spiral flow channel, 702 - annular flow channel, 703 - overflow port of the internal spiral flow channel, 8 - inverted cone, 801 - annulus of the inverted cone, 802 - discontinuous threaded connector, 9 - internal impact baffle, 901 - fixing hole of the internal impact baffle, 902 - anti - interference fillet of the internal impact baffle, 903 - connecting and fixing hole of the internal impact baffle, 10 - external impact baffle, 1001 - fixing hole of the external impact baffle, 1002 - anti - interference fillet of the external impact baffle, 1003 - connecting piece of the external impact baffle, 1004 - push - rod connecting hole, 11 - push rod, 1101 - anti - interference fillet of the push rod, 1102 - fixed shaft for the push - rod baffle, 1103 - fixing port of the movable ring, 12 - movable ring, 1201 - fixing ear, 13 - spring, 14 - spring fixing ring, 1401 - connecting thread of the fixing ring, 15 - fixing bolt. Detailed implementation manners

[0059] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0060] The special term "exemplary" here means "serving as an example, embodiment or illustration". Any embodiment described as "exemplary" here does not necessarily have to be construed as superior to or better than other embodiments.

[0061] In addition, for a better illustration of the present disclosure, numerous specific details are given in the following detailed implementation manners. Those skilled in the art should understand that the present disclosure can be implemented without some of these specific details. In some instances, methods and means well - known to those skilled in the art are not described in detail so as to highlight the gist of the present disclosure.

[0062] The external view of the automatic sand - discharging downhole oil - water hydrocyclone separation device is as shown in Figure 1 (a) and (b). a and b are different perspectives of the external view of an automatic sand - discharging downhole oil - water hydrocyclone separation device. This device can separate the sand phase and the oil - water phase from the oil - water - sand mixture, and the sand - discharging amount changes adaptively with the sand - content rate.

[0063] The oil - water - sand mixture enters the whole device through the liquid inlet 302 of the connecting outer pipe. After separation, the oil phase is discharged from the outlet 606 of the hydrocyclone fixed structure, the water phase is discharged from the gap between the underflow port 509 of the hydrocyclone and the inverted - cone annulus 801, and the sand phase is discharged from the sand - phase outlet 303 of the connecting outer pipe.

[0064] Figure 2 This is the exploded view of the modules of an automatic sand - discharging downhole oil - water hydrocyclone separation device. The device consists of Figure 2 (a) the outer hydrocyclone module 1, Figure 2 (b) the inner hydrocyclone self - adaptive sand - discharging module.

[0065] The overall cross - sectional view of an automatic sand - discharging downhole oil - water hydrocyclone separation device is as shown in Figure 3 The oil - water - sand mixture enters the whole device through the liquid inlet 302 of the connecting outer pipe. Through the diversion channel 402 of the outer spiral flow channel, a strong swirling flow is generated, so that the denser sand phase is thrown to the side wall. Finally, it flows out from the annulus 306 between the inner impact baffle 9, the outer impact baffle 10 and the connecting outer pipe 3, and finally after the sand - rich slope 304 enriches the sand phase, it is discharged from the sand - phase outlet 303 of the connecting outer pipe, realizing the separation of the sand phase. The oil - water mixture moves axially upward after hitting the disc - shaped convex platform 504 of the impact hydrocyclone. In addition, the disc - shaped convex platform of the hydrocyclone can also prevent the sand phase from leaking out from the inner gap between the hydrocyclone 5 and the two baffles, playing a role in blocking the sand phase. The separated oil - water mixture enters the annulus 404 between the outer spiral flow channel and the hydrocyclone from the chamfer 403 at the lower end of the outer spiral flow channel. Compared with the structure without a chamfer, the circular - ring surface area at the lower end of the spiral flow channel will block the entry of part of the liquid phase. Adding a chamfer mechanism can reduce the circular - ring area of the blocking part, playing a role in diversion, so that more oil - water mixture enters the hydrocyclone for separation. Finally, the mixture enters the hydrocyclone through the liquid inlet hole 503 of the hydrocyclone. After entering the inside of the hydrocyclone, a swirling flow is provided again for the oil - water mixture through the annular flow channel 702 to carry out oil - water separation. The separated oil phase flows out from the overflow port 703 of the inner spiral flow channel, and the water phase flows out from the underflow port 509 of the hydrocyclone.

[0066] Figure 4 This is the exploded view of the outer hydrocyclone separation module. The module consists of Figure 4 (a) the connecting outer pipe 3 and Figure 4 (b) the outer spiral flow channel 4.

[0067] The cross - sectional view of the outer hydrocyclone separation module is as shown inFigure 5 As shown, the oil-water-sand mixture enters the outer cyclone separation module through the liquid inlet 302 of the connecting outer pipe. Through the drainage channel 402 of the outer spiral flow path, a strong swirling effect is generated, causing the sand phase with a higher density to be thrown to the side wall, thus completing the separation of the sand phase. The device is fixed by screwing the upper thread 301 of the connecting outer pipe and the upper thread 601 of the cyclone fixing structure, and the fixing thread 401 of the outer spiral flow path and the inner thread 501 at the upper end of the cyclone. The fixing hole at the bottom of the cyclone inserts the cyclone 5 to fix its lower end.

[0068] Figure 6 It is the overall appearance diagram of the inner cyclone self-adaptive sand discharging module. The whole device is respectively screwed together through the outer thread 502 at the upper end of the cyclone, the upper thread 601 of the cyclone fixing structure, the fixing thread 401 of the outer spiral flow path, and the upper thread 301 of the connecting outer pipe, so that this module is connected and fixed to the outer cyclone separation module. The inner impact baffle 9 and the outer impact baffle 10 are sleeved together on the impact baffle fixing shaft 505, enabling the baffles on both sides to rotate around the impact baffle fixing shaft 505 within a certain angle, and preventing interference between the two baffles caused by rotation by means of the anti-interference fillet 902 of the inner impact baffle and the anti-interference fillet 1002 of the outer impact baffle. At the other end of the impact baffle, it is coupled and fixed through the impact baffle connecting piece 1003 passing through the impact baffle connecting and fixing hole 903, and the two baffles are fixed by connecting the push rod baffle fixing shaft 1102 to the push rod connecting hole 1004. The anti-interference fillet 1101 of the push rod is processed to prevent interference of the push rod 11 with the impact baffle. The movable ring fixing port 1103 of the lower push rod 11 and the fixing ear 1201 are coupled and then fixed by passing through the fixing bolt 15, enabling it to rotate relative to a certain angle within a certain range.

[0069] Figure 7 It is the exploded view of the inner cyclone self-adaptive sand discharging module, mainly composed of the cyclone 5, the cyclone fixing structure 6, the inner spiral flow path 7, the inverted cone 8, the inner impact baffle 9, the outer impact baffle 10, the push rod 11, the movable ring 12, the spring 13, and the spring fixing ring 14.

[0070] Figure 8 It is the cross-sectional view of the inner cyclone self-adaptive sand discharging module. The cyclone 5 is screwed to the cyclone fixing structure 6 through the inner thread 501 at the upper end of the cyclone and the outer thread 603 at the lower end of the cyclone fixing structure. The inner thread 604 at the lower end of the cyclone fixing structure is screwed to the upper thread 701 of the spiral flow path to fix the inner spiral flow path 7. The spring fixing ring 14 is fixed by screwing 1401 to the lower thread 507 of the cylindrical track. The overflow variable diameter port 602 can change the diameter of the overflow port for convenient transportation. The separated oil phase flows out from the overflow port 605 of the cyclone fixing structure. The underflow port thread 508 of the cyclone is screwed to the inverted cone fixing thread 802 to fix the inverted cone 8. The purpose of adding the inverted cone 8 is to make the oil core more stable.

[0071] Figure 9 It is a structural diagram of a hydrocyclone. The thread 507 at the lower end of the cylindrical track is threadedly connected to the connection thread 1401 of the fixed ring to fix the fixed spring fixing ring 14, limit the lower ends of the spring 13 and the movable ring 12, and enable it to axially move on the cylindrical track 506 of the movable ring.

[0072] Figure 10 It is a working state diagram of the inner swirl self - adapting sand discharge module. a shows the working condition under low sand content. At this time, due to the elastic force of the spring 13, the spring elastic force is transmitted to the push rod 11 and then acts on the outer impact baffle 10 through the push rod 11. At this time, the minimum flow - through area of the annulus 306 between the connecting outer pipe and the hydrocyclone is the smallest. Most of the oil - water mixture impacts the disc - shaped boss 504 of the hydrocyclone and the impact baffle and then reverses. Finally, the sand phase flows out through the annulus 306 between the connecting outer pipe and the hydrocyclone, and the oil - water mixture axially enters the inner swirl self - adapting sand discharge module for oil - water separation. b shows the working condition under high sand content. At this time, due to the increase in sand content, the impact baffle is subjected to a large sand - phase impact force, which causes the impact baffle to be pressed, the push rod and the movable ring to be pressed, and finally the spring to be compressed. At this time, the annulus 306 between the connecting outer pipe and the hydrocyclone is the largest, and the most sand phase passes through. Thus, the flow - through area of the sand phase is changed with the change of sand content to achieve the purpose of self - adapting sand discharge.

[0073] Figure 11 、 Figure 12 It is a structural diagram of the inner impact baffle and the outer impact baffle. The fixing holes 901 of the inner impact baffle and the fixing holes 1001 of the outer impact baffle are connected to the impact baffle fixing shaft 505 to enable it to rotate within a certain range. The coupling connection between the connection fixing hole 903 of the impact baffle and the connection piece 1003 of the impact baffle enables the overall movement.

[0074] Figure 13 It is a structural diagram of the push rod. The anti - interference fillet 1101 of the push rod can prevent interference between the push rod 11 and the outer impact baffle 10 when the push rod 11 rotates. The push rod baffle fixing shaft 1102 is connected to the push rod connection hole 1004 of the outer impact baffle 10 to enable it to rotate relative to a certain angle within a certain range. The movable ring fixing port 1103 and the fixed ear 1201 are connected by the fixing bolt 15 to enable relative rotation within a certain range. The above enables the push rod 11 to rotate flexibly when the working state needs to be changed.

[0075] Figure 14 It is a structural diagram of the movable ring. The movable ring is coupled with the movable ring fixing port 1103 through the fixed ear 1201 and fixed by passing through the fixing bolt 15.

[0076] After the mixed liquid enters the outer cyclone separation module, solid-liquid cyclone separation is carried out. The separated solid phase is discharged from the sand phase outlet. After passing through the inner cyclone self-adaptive sand discharge module, oil-water separation can be carried out on the liquid phase, making the efficiency stable, achieving fine oil-water separation, avoiding the influence of unstable sand content on the oil-water separation efficiency. The multi-stage series combination is suitable for the separation of injection-production media in the same well in industrialization and has high practical value.

[0077] The embodiments described above are exemplary, not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to technologies in the market, or to enable other ordinary skill in the art to understand the disclosed embodiments.

Claims

1. An automatic sand - discharging downhole oil - water cyclone separation component, comprising a cyclone (5), characterized in that: The cyclone is a hollow cylinder with unequal diameters, provided with a cyclone inlet, a cyclone liquid inlet hole (503) and a cyclone underflow port (509); at the cyclone inlet, a cyclone upper - end internal thread (501) and a cyclone upper - end external thread (502) are provided; in the middle section of the cyclone, a cyclone disc - shaped boss (504) and a movable - ring cylindrical track (506) are provided; at the lower end of the movable - ring cylindrical track, a cylindrical - track lower - end thread (507) is provided, and in the cyclone underflow port, a cyclone underflow - port thread (508) is provided; Impact - baffle fixing shafts (505) are arranged on both sides of the cyclone disc - shaped boss (504); The component further comprises an inner impact baffle (9), an outer impact baffle (10), a push rod (11), a movable ring (12), a spring (13) and a spring fixing ring (14); The impact - baffle fixing shafts (505) pass through the inner impact - baffle fixing holes (901) and the outer impact - baffle fixing holes (1001) of the inner impact baffle (9) and the outer impact baffle (10) respectively, and finally pass through two pairs of inner - and - outer impact baffles on the impact - baffle fixing shafts (505) on both sides, so that they can all rotate around the impact - baffle fixing shafts within a certain range; the movable ring (12) and the spring (13) are both sleeved on the movable - ring cylindrical track (506), so that the movable ring (12) and the spring (13) can move axially within a certain range on the movable - ring cylindrical track; the cylindrical - track lower - end thread (507) and the fixing - ring connection thread (1401) provided on the spring fixing ring (14) are connected by threads; The push - rod baffle fixing shaft (1102) passes through the push - rod connection hole (1004) to fix the outer impact baffle (10) and at the same time fix the inner and outer impact baffles so that they can move simultaneously; The push rod (11) is provided with an anti - interference fillet to ensure that there is no mutual influence at the connection when the push rod (11) and the outer impact baffle (10) rotate relative to each other. The push - rod baffle fixing shaft (1102) passes through the push - rod connection hole (1004) to fix one end of the push rod, and the other end is connected by bolts; The movable ring (12) and the push rod (11) are connected through a movable - ring fixing port (1103) and a fixing ear (1201) on the movable ring (12) and can rotate relative to each other within a certain range; The fixing - ring connection thread (1401) of the fixing ring (14) and the cylindrical - track lower - end thread (507) are fixed by threads; the fixing bolt (15) passes through the movable - ring fixing port (1103) and the fixing ear (1201) to fix the two parts together so that the lower end of the push rod (11) can rotate relative to the fixing ring (14).

2. The automatic sand-discharging downhole oil-water hydrocyclone separation assembly according to claim 1, wherein: Both the inner impact baffle (9) and the outer impact baffle (10) are quarter-circular ring structures. The fixed ends of the two baffles are fixed respectively by passing the impact baffle fixing shaft (505) through the inner impact baffle fixing hole (901) and the outer impact baffle fixing hole (1001); on both sides of the impact baffle fixing shaft (505), the inner impact baffle and the outer impact baffle adopt a concave-convex nested structure, and are respectively provided with an inner impact baffle anti-interference fillet (902) and an outer impact baffle anti-interference fillet (1002) to ensure that the inner impact baffle and the outer impact baffle do not interfere with each other when rotating; The inner impact baffle connection fixing hole (903) is connected to the outer impact baffle (10) by inserting the outer impact baffle connecting piece (1003) into it, so that the inner impact baffle (9) and the outer impact baffle (10) are connected together and move simultaneously when the rotation angle is required. The other pair of inner and outer impact baffles has exactly the same structure; After the outer impact baffle connecting piece (1003) passes through the inner impact baffle connection fixing hole (903), it is fixed to the outer impact baffle (10) by passing the push rod baffle fixing shaft (1102) through the push rod connection hole (1004), and at the same time, the inner and outer impact baffles are fixed so that they can move simultaneously.

3. An automatic sand-discharging downhole oil-water hydrocyclone separation assembly according to claim 2, characterized in that: The cyclone separation assembly further includes an inverted cone (8); the inverted cone is composed of a cone and a frustum of a cone connected together; on the outer wall of the frustum of the cone, there is a discontinuous threaded connection body (802), and the discontinuous threaded connection body can be connected to the cyclone underflow port thread (508), and an inverted cone annulus (801) is formed after connection.

4. An automatic sand-discharging downhole oil-water hydrocyclone separation assembly according to claim 3, characterized in that: The cyclone separation assembly further includes a cyclone fixing structure (6), and the cyclone fixing structure (6) is a connecting and fixing part; Inside the cyclone fixing structure, there is an overflow variable diameter port (602), and at the lowest end of the overflow variable diameter port is the cyclone fixing structure overflow port (605); On the outer wall of the cyclone fixing structure, there are a cyclone fixing structure upper end thread (601) and a cyclone fixing structure lower end external thread (603); at the bottom end of the cyclone fixing structure, below the cyclone fixing structure overflow port, there is a concave annular space, and on the inner wall of the annular space, there is a cyclone fixing structure lower end internal thread (604); The cyclone upper end internal thread (501) is threadedly connected to the cyclone fixing structure lower end external thread (603).

5. An automatic sand-discharging downhole oil-water hydrocyclone separation assembly according to claim 4, characterized in that: The cyclone separation assembly further includes an inner spiral flow channel (7). On the outer wall of the inner spiral flow channel, there is an annular flow channel (702), and inside there is an inner spiral flow channel overflow port (703) running through the entire inner spiral flow channel. On the round platform extending outwards at the top end of the inner spiral flow channel (7), there is a spiral flow channel upper end thread (701); the cyclone fixing structure lower end internal thread (604) and the spiral flow channel upper end thread (701) are in conformity, and can realize the threaded connection of the inner spiral flow channel (7) inside the cyclone fixing structure (6). After connection, the inner spiral flow channel overflow port (703) is communicated with the cyclone fixing structure overflow port (605).

6. The automatic sand-discharging downhole oil-water cyclone separation assembly according to claim 5, characterized in that: The cyclone separation assembly further includes an outer cyclone separation module; the outer cyclone separation module includes a connecting outer pipe (3) and an outer spiral flow channel (4); The connecting outer pipe (3) is provided with a connecting outer pipe upper end thread (301), a connecting outer pipe liquid inlet (302), and a connecting outer pipe liquid outlet (305). A sand settling inclined surface (304) is provided at the bottom end of the connecting outer pipe. A connecting outer pipe sand phase outlet (303) is opened at the intersection of the sand settling inclined surface and the connecting outer pipe wall; The outer spiral flow channel (4) is cylindrical. An outer spiral flow channel fixing thread (401) is provided on the inner wall of the top end. An outer spiral flow channel drainage channel (402) is provided on the outer wall of the outer spiral flow channel (4); The outer spiral flow channel fixing thread (401) is connected to the outer thread (502) at the upper end of the cyclone. After connection, an inner annulus (404) is formed between the outer spiral flow channel (4) and the cyclone (5), and the inner annulus communicates with the cyclone liquid inlet hole; The connecting outer pipe upper end thread (301) is connected to the cyclone fixing structure upper end thread (601). The separated sand phase gathers through the sand settling inclined surface (304) and flows out from the connecting outer pipe sand phase outlet (303).

7. An automatic sand-discharging downhole oil-water cyclone separation assembly according to claim 6, characterized in that: The bottommost circle of the outer spiral flow channel drainage channel (402) is set as an outer spiral flow channel lower end chamfer (403), and the angle range is between 30 degrees and 80 degrees.

8. An automatic sand-discharging downhole oil-water cyclone separation device, characterized in that Apply at least two sets of the cyclone separation assemblies described in claim 7. Connect the same cyclone separation assemblies in series from top to bottom to form a separation device that can be connected to an underground oil pipe to form a process string.

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