A gravity-cyclone coupling enhanced de-oiling and de-sanding device for injection and production in the same well

Abstract

The present invention relates to a gravity-cyclone coupling enhanced oil removal and sand removal device for injection and production in the same well, which includes a sand removal module and an oil-water separation module. The sand removal module includes a coaxial sleeve, a sand removal cylinder, and an annular slider; the oil-water separation module includes an oil cylinder, a cyclone, and a spiral flow channel. The cyclone is arranged in the oil cylinder. The coaxial sleeve is composed of an inner cylinder and an outer cylinder coaxially at the same top. The oil cylinder is coaxially fixed in the inner cylinder through a center hole. The annular space between the inner cylinder and the oil cylinder is a liquid phase channel. The sand removal cylinder extends upward into the annular space between the inner cylinder and the outer cylinder. The annular space between the outer cylinder and the sand removal cylinder is a mixed phase inlet channel, and the lower port of the mixed phase inlet channel is a mixed phase inlet; a support plate is fixed on the inner wall of the lower end of the sand removal cylinder, and the sand removal cylinder is fixedly connected to the oil cylinder through a support cylinder. An annular slider is arranged in the annular space between the sand removal cylinder and the oil cylinder. The present invention realizes multiphase separation of oil, water and sand, and controls the automatic switching of the sand discharge function according to the weight of the deposited sand phase.

Description

Technical Field

[0001] The invention relates to an oil-water-sand three-phase medium separation device used in the field of underground same-well injection and production, and specifically relates to an underground gravity-cyclone coupling enhanced deoiling and sand removal device for the same-well injection and production. Background Art

[0002] In many areas of my country, pipe wells have a series of pipe well operation problems due to the high sand content in the well water, which leads to damage to the pumping equipment, sinking of the pump house foundation, bending and even breaking of the well pipe. Some pipe wells are scrapped after a short period of use, which not only causes economic losses, but also affects normal production and life. In view of the high sand content in the oil field well, most of the existing technologies use a multi-drum parallel method to remove sand. The Chinese invention patent with announcement number CN104060977A discloses a multi-phase cyclone sand removal device, which uses a gas-separated multi-phase separation and drainage sand dragging and multi-drum parallel method for multi-phase sand removal. It can be seen from the content disclosed in the document that although the multi-drum parallel method has high sand removal efficiency and adjustable processing capacity, the separation accuracy of sand removal is low. Since the density of the sand phase is greater than that of the liquid phase, gravity sedimentation can meet the deposition of fine sand particles. Summary of the invention

[0003] The purpose of the present invention is a gravity-cyclone coupling enhanced deoiling and sand removal device for injection and production in the same well. The gravity-cyclone coupling enhanced deoiling and sand removal device for injection and production in the same well can be a three-phase separation device that can automatically settle and discharge sand.

[0004] The technical solution adopted by the present invention to solve its technical problems is: this downhole gravity-cyclone coupling enhanced deoiling and sand removal device for injection and production in the same well includes a sand removal module and an oil-water separation module, the sand removal module includes a coaxial sleeve, a sand removal cylinder, and an annular slider; the oil-water separation module includes an oil cylinder, a cyclone, and a spiral flow channel, the cyclone is arranged in the oil cylinder, the spiral flow channel is placed in the cyclone cavity, and the spiral flow channel is fixedly connected to the oil cylinder through a flange at its top; the coaxial sleeve is composed of an inner cylinder and an outer cylinder coaxially at the same top, the lower end of the coaxial sleeve is open, the inner cylinder extends from the outer cylinder, a center hole is arranged on the top of the inner cylinder, the oil cylinder is coaxially fixed in the inner cylinder through the center hole, the upper end of the oil cylinder extends from the center hole, the annular space between the inner cylinder and the oil cylinder is a liquid phase channel, and the lower port of the liquid phase channel is a liquid phase channel The sand removal cylinder extends upward into the annular space between the inner cylinder and the outer cylinder, the annular space between the outer cylinder and the sand removal cylinder is the mixed phase inlet channel, and the lower port of the mixed phase inlet channel is the mixed phase inlet; a support plate is fixed on the inner wall of the lower end of the sand removal cylinder, the center of the support plate is a support cylinder, the support cylinder is threadedly connected to the lower end of the oil cylinder, the sand removal cylinder is fixedly connected to the oil cylinder through the support cylinder, the lower port of the oil cylinder extends out of the sand removal cylinder, an annular slider is arranged in the annular space between the sand removal cylinder and the oil cylinder, and a plurality of sliding cylinders are evenly arranged along the circumference of the annular slider, the upper end of each sliding cylinder just passes through the column hole of the support plate, a spring surrounds the sliding cylinder, the lower end of the spring is fixed on the support plate, the upper end of the spring is fixed under the nut, the diameter of the nut is larger than the diameter of the column hole, and the nut is threadedly connected to the corresponding sliding cylinder.

[0005] In the above scheme, the annular space between the oil cylinder and the sand removal cylinder is a sand phase sedimentation chamber, the mixed phase inlet channel is connected to the sand phase sedimentation chamber of the sedimentation chamber channel, and the upper part of the sand phase sedimentation chamber is a liquid phase channel, which is connected to the liquid inlet of the oil cylinder.

[0006] In the above scheme, the annular slider is an annular plate with six sliding cylinders, and threads are opened on the top of the sliding cylinders. The incoming sand phase will be deposited on the annular slider under the action of gravity sedimentation. The sliding cylinders are threadedly connected to the nuts and axially matched. The annular slider and the sand removal cylinder are nested and connected through the nuts and sliding cylinders.

[0007] In the above scheme, the coaxial sleeve serves as the upper passage, and the coaxial sleeve is fixed on the first clamping ring of the oil cylinder by means of threads.

[0008] In the above scheme, the top of the spiral flow channel is a flange, the center of the flange is an overflow port, the flange has four spiral flow channel fixing holes in a circumferential array, threads are opened in the spiral flow channel fixing holes, the threads of the screws fix the flange and the oil cylinder together, and the spiral flow channel cooperates with the cyclone and the axis of the oil cylinder.

[0009] In the above scheme, the oil cylinder is a cylinder with threads on the outer top, the inner middle and upper part, and the outer bottom. The oil cylinder includes an oil cylinder outlet and an oil cylinder liquid inlet. A first clamping ring is arranged on the outer wall of the oil cylinder above the oil cylinder liquid inlet, and a second clamping ring is arranged on the inner wall of the oil cylinder below the oil cylinder liquid inlet. The first clamping ring is clamped with the coaxial sleeve, and the second clamping ring is clamped with the cyclone. A third clamping ring is arranged on the outer wall of the lower end of the oil cylinder, and the third clamping ring is used to fix the position of the sand removal cylinder. The cyclone and the spiral flow channel are placed in the cavity of the oil cylinder.

[0010] The cyclone in the above scheme is a shaft-entered cyclone, which is threadedly connected to the inner wall of the oil cylinder. The cyclone, the oil cylinder and the spiral flow channel are axially matched, and the top surface of the cyclone coincides with the lower surface of the second clamping ring of the oil cylinder, which plays a role in fixing the cyclone. Beneficial Effects

[0011] 1. The overall configuration of the present invention is innovative, enriching the structure of the multiphase separation device. It can achieve three-phase separation of oil, water and sand from top to bottom by adopting a vertical working mode, while meeting the high flow processing capacity and automatic sand removal functions.

[0012] 2. The bottom of the present invention is a sand removal module. When the oil-water-sand three-phase mixture enters the bottom of the device, solid-liquid separation is performed in the solid-liquid separation module through the principle of gravity sedimentation. The sand phase with higher density is thus deposited at the bottom of the device, while the oil-water mixture with lower density enters the oil cylinder through the upper pipe.

[0013] 3. The sand phase of the present invention can be automatically discharged from the device. When too much sand phase is deposited at the bottom, the gravity of the sand phase will push the spring at the bottom of the device, thereby generating compression deformation, and the annular slider is pushed to start moving downward. The annular slider is separated from the sand removal cylinder, so that the bottom of the device is opened, and the sand phase deposited at the bottom is discharged through the gap.

[0014] 4. The sand removal module of the present invention is uniquely designed, and the device can automatically restore to its initial state after the sand discharge is completed. When the sand phase is discharged from the bottom, the gravity is less than the spring force, pushing the annular slider upward, closing the sand discharge gap, and thus completing a solid-liquid separation and sand discharge cycle. The free switching between sand settling and sand discharge functions can be achieved, and the recycling has a high use value.

[0015] 5. The device of the present invention integrates the functions of three-phase separation, automatic sand settling and discharge, and free switching of sand discharge. It has a unique structure and realizes the separation of sand phase and liquid phase only by gravity sedimentation. When the sand phase deposited at the bottom of the device reaches a certain weight, it pushes the bottom parts to move downward, and the sand phase will be discharged from the device through the opened gap. After the sand discharge is completed, the upward elastic force of the bottom spring itself is greater than the downward gravity, and the resulting combined force pulls the bottom parts upward, thereby closing the sand discharge port and completing a sand settling and sand removal cycle, realizing the free switching of sand settling and sand discharge, and greatly enhancing the applicability.

[0016] 6. The present invention is a three-phase separation device that can automatically deposit and discharge sand. The automatic separation of sand phase and liquid phase is achieved through the gravity sedimentation principle of the sand phase. The weight of the deposited sand phase controls the sliding of the bottom parts and then discharges the device. After the sand discharge is completed, the bottom parts move up under the action of the spring to close the sand discharge port, thereby realizing the automatic switching between sand deposition and sand discharge. The separation efficiency is high and the processing process is simple. It will be widely recognized and applied in multi-phase separation fields such as petroleum and sand removal.

[0017] 7. The present invention assembles multiple parts by threads and adopts a unique structural design to achieve multi-phase separation of oil, water and sand, and controls the automatic switching of the sand discharge function according to the weight of the deposited sand phase. It is a separation device used in professional fields such as underground same-well injection and production sand removal and separation pipe string sand removal treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the appearance diagram of a three-phase separation device for injection and production and sand removal in the same well.

[0019] Figure 2 This is an exploded diagram of a module of a three-phase separation device for injection and production and sand removal in the same well.

[0020] Figure 3 It is an overall cross-sectional view of a three-phase separation device for injection and production and sand removal in the same well.

[0021] Figure 4 This is the exploded view of the sand removal module.

[0022] Figure 5 This is a cross-sectional view of the sand removal module.

[0023] Figure 6 This is the appearance diagram of the oil-water separation module.

[0024] Figure 7 This is the exploded diagram of the oil-water separation module.

[0025] Figure 8 This is a cross-sectional view of the oil-water separation module.

[0026] Fig. 9 This is a cross-sectional view of the internal assembly of the ring slider.

[0027] Fig.10 This is a cross-sectional view comparing the status before and after sand discharge.

[0028] Fig.11 This is an enlarged view of the oil cylinder retaining ring.

[0029] In the figure, 1-sand removal module, 2-oil-water separation module, 101-sand removal cylinder, 102-spring, 103-annular slider, 104-nut, 105-coaxial sleeve, 201-cyclone, 202-spiral flow channel, 203-oil cylinder, 204-screw, 1011-support plate, 1013-sand discharge port, 1015-sand phase sedimentation chamber, 1031-sliding cylinder, 1051-mixed phase inlet, 1052-liquid phase channel port, 2012-bottom flow port, 2022-overflow port, 2031-first retaining ring, 2032-second retaining ring, 2033-third retaining ring, 2034-oil cylinder liquid inlet. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings:

[0031] Combination Figure 1-Figure 11 As shown, this downhole gravity-cyclone coupling enhanced de-oiling and sand removal device for injection and production in the same well includes a sand removal module and an oil-water separation module. The sand removal module 1 includes a sand removal cylinder 101, a spring 102, an annular slider 103, a nut 104, and a coaxial sleeve 105; the sand removal cylinder 101 is a cylinder with a support plate 1011, which is placed on the outer axis of the oil cylinder 203 and is threaded and fixed. The gap between its bottom and the annular slider 103 is a sand discharge port 1013. The six annular slider fixing holes of the sand removal cylinder 101 and the six sliding cylinders 1031 of the annular slider 103 are respectively inserted and axially matched to realize the up and down sliding of the annular slider 103.

[0032] The spring 102 is ring-shaped on the six sliding cylinders 1031 of the annular slider 103, and its two ends are flat-bottomed. The top flat bottom surface is in contact with the bottom surface of the nut 104 and fixed together, and the bottom flat bottom surface is in contact with the surface of the support plate 1011 of the sand removal cylinder 101 and is welded and fixed together, and cooperates with the axis of the sliding cylinder 1031 of the annular slider 103.

[0033] The annular slider 103 is an annular plate with six sliding cylinders 1031, and the sliding cylinders 1031 are threaded. The sand phase entering the channel will be deposited on the annular slider 103 under the action of gravity sedimentation. The six sliding cylinders 1031 of the annular slider 103 are threadedly connected to the nut 104. The sliding cylinder 1031 of the annular slider 103 is threadedly connected to the spring 102. The annular slider 103 is axially matched with the oil cylinder 203. The annular slider 103 is threadedly connected to the nut 104 and axially matched. The annular slider 103 is axially matched with the sand removal cylinder 101, and the two slide together with the nut 104 and the sliding cylinder 1031 nested connection.

[0034] The nut 104 is threadedly connected to the six sliding cylinders 1031 of the annular slider 103 and axially matched to fix the spring 102 sleeved on the sliding cylinder 1031 .

[0035] The coaxial sleeve 105 is used as an upper passage and is fixed to the upper surface of the first clamping ring 2031 of the oil cylinder 203 by means of threads, so as to fix the coaxial sleeve 105. The coaxial sleeve 301 is matched with the axis of the oil cylinder 203 and is threadedly connected. The gap between the coaxial sleeve 105 and the sand removal cylinder 101 is the mixed phase inlet 1051.

[0036] The oil-water separation module 2 includes a cyclone 201, a spiral flow channel 202, an oil cylinder 203, and a screw 204; the cyclone 201 is a shaft-entry cyclone. The spiral flow channel 202 is placed in its cyclone cavity, and then placed in the oil phase cavity of the oil cylinder 203, and connected with the internal thread of the oil cylinder 203. The cyclone 201 is axially matched with the oil cylinder 203 and the spiral flow channel 202. Its top surface coincides with the lower surface of the second clamping ring 2032 of the oil cylinder 203, which plays a role in fixing the cyclone 201.

[0037] The spiral flow channel 202 includes a flange, an overflow port 2022, and a spiral flow channel fixing hole. The top of the flange is used to fix the oil cylinder 203, and the center of the flange is the overflow port 2022. The flange has four spiral flow channel fixing holes in a circumferential array, and the spiral flow channel fixing holes are threaded and placed in the spiral flow channel fixing holes of the cyclone 201 and the oil cylinder 203. The screw 204 fixes the flange of the spiral flow channel 202 and the oil cylinder 203 together. The spiral flow channel 202 is axially matched with the cyclone 201, the oil cylinder 203, and the screw 204.

[0038] The oil cylinder 203 is a cylinder with threads on the outer top, the inner middle and upper part, and the outer bottom. It is the central part of the device, and all other parts are fixed around it. Its main structure includes the oil cylinder liquid inlet 2034, the outer wall of the oil cylinder, and the first clamp ring 2031, the second clamp ring 2032 and the third clamp ring 2033 above and below the oil cylinder outlet. The first clamp ring 2031 outside is used to fix the coaxial sleeve 301, while the second clamp ring 2032 inside is used to fix the cyclone 201; the third clamp ring 2033 outside is used to fix the position of the sand removal cylinder 101, thereby determining the range of movement of the annular slider 103. The cyclone 201 and the spiral flow channel 202 are placed in its cavity. The oil cylinder 203 is axially matched with the annular slider 103. The oil cylinder 203 is axially matched with the spiral flow channel 202. The oil cylinder 203 is axially matched with the cyclone 201. The oil cylinder 203 is axially matched with the coaxial sleeve 105. The oil cylinder 203 is axially matched with the sand removal cylinder 101 .

[0039] The present invention is used in a vertical working state, and can finely separate and separately collect the sand, oil phase and water phase of the multiphase medium mixture. After the three-phase medium mixture enters the device through the mixed phase inlet 1051 of the coaxial sleeve 105, the solid-liquid two-phase separation is carried out in the sand phase sedimentation chamber 1015 area of ​​the sand removal module 1 through the principle of gravity sedimentation. The sand phase with a larger density is deposited above the annular slider 103. Under the action of its own gravity, the sand phase pushes the annular slider 103 to open the sand discharge port 1013, and the sand phase is then discharged from the device; the oil-water mixture with a smaller density enters the cyclone 201 inside the oil cylinder 203 through the liquid phase channel port 1052 and the oil cylinder liquid inlet 2034 for cyclone separation, that is, the separation of the oil phase and the water phase is realized, the oil phase is discharged from the overflow port 2022, and the water phase is discharged from the bottom flow port 2012. The separated oil phase is lifted to the ground, and the separated water phase is directly injected back into the ground. After the sand discharge is completed, the spring 102 automatically rebounds, and the device returns to its initial state, completing a working cycle.

[0040] Figure 4 This is an exploded view of the sand removal module, which is mainly composed of a sand removal cylinder 101, a spring 102, an annular slider 103, a nut 104 and a coaxial sleeve 105. Figure 5 The dotted box is a cross-sectional view of the sand removal module 1. After the three-phase mixed liquid enters the device through the mixed phase inlet 1051, the solid and liquid phases are separated in the sand phase sedimentation chamber 1015 area by the principle of gravity sedimentation. The sand phase is deposited on the annular slider 103 at the bottom of the device, and the liquid phase flows into the liquid phase channel port 1052.

[0041] Figure 6 This is the appearance diagram of the oil-water separation module. Screws 204 fix the spiral flow channel 202 and the oil cylinder 203 together. Figure 7 It is an exploded view of the oil-water separation module, which is mainly composed of a cyclone 201, a spiral flow channel 202, an oil cylinder 203 and a screw 204. Figure 8 It is a cross-sectional view of the oil-water separation module. When the oil and water phases enter the oil-water separation module from the oil cylinder liquid inlet 2034, they pass through the cyclone 201 and are separated by the cyclone. The oil phase is discharged from the upper overflow port 2022, and the water phase is discharged from the lower bottom flow port 2012. Finally, the water phase is directly reinjected and the oil phase is lifted to the ground.

[0042] Fig. 9The figure is the internal assembly view of the annular slider, and the support plate 1011 serves as the lower support surface of the spring 102. When the sand removal cylinder 101 slides, the spring 102 will automatically stretch and compress, and at the same time, the length of the spring 102 itself limits the sliding range of the sand removal cylinder 101. The spring 102 is supported on the support plate 1011 of the sand removal cylinder 101 at the bottom, and contacts the nut 104 at the top. When the sand phase is deposited too much, the annular slider 103 is pushed downward by gravity, driving the sliding cylinder 1031 to slide down, and the spring 102 begins to compress, and the annular slider 103 is separated from the sand removal cylinder 101, and the sand discharge port 1013 between the annular slider 103 and the sand removal cylinder 101 is opened, and the sand phase is discharged from the device through this port. At the same time, the length of the spring 102 itself limits the sliding range of the sand removal cylinder 101. After the sand phase is discharged from the device, the gravity of the spring 102 is less than the elastic force of the spring 102, pushing the annular slider 103 upward, and the sand discharge port 1013 is closed.

[0043] Fig.10 The left figure is a cross-sectional view comparing the states before and after sand discharge. The left figure is the state of the parts when there is less sand deposition in the device. At this time, the spring 102 sleeved on the sliding cylinder 1031 is not compressed, the annular slider 103 does not slide downward, and the sand discharge port 1013 between the annular slider 103 and the sand removal cylinder 101 is tightly closed. The right figure is a state diagram of the parts when there is more sand deposition. At this time, the spring 102 sleeved on the sliding cylinder 1031 is compressed, the sand removal cylinder 103 slides downward, and the sand discharge port 1013 between the annular slider 103 and the sand removal cylinder 101 is opened, and the sand phase is discharged from the device through this port.

[0044] Fig.11 This is an enlarged view of the oil cylinder clamp ring. In the upper right figure, the first clamp ring 2031 clamps the coaxial sleeve 105 above it, and the second clamp ring 2032 clamps the cyclone 201 below it, which plays a role in fixing the coaxial sleeve 105 and the cyclone 201. In the lower right figure, the third clamp ring 2033 clamps the sand removal cylinder 101 below it, which plays a role in fixing the sand removal cylinder 101.

[0045] When the present invention is working, the three-phase mixed liquid first enters the sand removal module to separate the middle sand phase from the liquid phase of the three-phase mixed liquid. The solid-liquid separation is achieved in the sand removal area by the principle of gravity sedimentation. The sand phase with higher density is deposited on the annular slider. The sand phase pushes the annular slider under the action of its own gravity to open the sand discharge port, and the sand phase is discharged from the device from this port. The oil-water mixture with lower density enters the cyclone for cyclone separation. The separated oil phase is lifted to the ground, and the separated water phase is directly injected back into the ground. At the same time, the weight of the deposited sand phase can control the discharge of the sand phase. After the sand phase is discharged from the device, the spring gravity is less than the spring elastic force, which pushes the annular slider upward, and it can automatically restore to its original state for recycling.

Claims

1. A gravity-cyclone coupling enhanced de-oiling and de-sanding device for injection and production in the same well, characterized by: The device for enhancing oil removal and sand removal by gravity-cyclone coupling in injection and production in the same well comprises a sand removal module and an oil-water separation module. The sand removal module comprises a coaxial sleeve, a sand removal cylinder and an annular slider; the oil-water separation module comprises an oil cylinder, a cyclone and a spiral flow channel. The cyclone is arranged in the oil cylinder, the spiral flow channel is placed in the cyclone chamber, and the spiral flow channel is fixedly connected to the oil cylinder through a flange at its top; the coaxial sleeve is composed of an inner cylinder and an outer cylinder coaxially at the same top, the lower end of the coaxial sleeve is open, the inner cylinder extends from the outer cylinder, a center hole is arranged at the top of the inner cylinder, the oil cylinder is coaxially fixed in the inner cylinder through the center hole, the upper end of the oil cylinder extends from the center hole, the annular space between the inner cylinder and the oil cylinder is a liquid phase channel, the lower port of the liquid phase channel is a liquid phase channel port, the sand removal cylinder extends upward into the annular space between the inner cylinder and the outer cylinder, and the annular space between the outer cylinder and the sand removal cylinder is A mixed phase inlet channel, the lower port of the mixed phase inlet channel is the mixed phase inlet; a support plate is fixed on the inner wall of the lower end of the sand removal cylinder, the center of the support plate is a support cylinder, the support cylinder is threadedly connected to the lower end of the oil cylinder, the sand removal cylinder is fixedly connected to the oil cylinder through the support cylinder, the lower port of the oil cylinder extends out of the sand removal cylinder, an annular slider is arranged in the annular space between the sand removal cylinder and the oil cylinder, a plurality of sliding cylinders are evenly arranged along the circumference of the annular slider, the upper end of each sliding cylinder just passes through the column hole of the support plate, a spring surrounds the outside of the sliding cylinder, the lower end of the spring is fixed on the support plate, the upper end of the spring is fixed under the nut, the diameter of the nut is larger than the diameter of the column hole, and the nut is threadedly connected to the corresponding sliding cylinder; when too much sand phase is deposited, the annular slider is pushed downward under the action of gravity, driving the sliding cylinder to slide down, the spring begins to compress, and the annular slider is separated from the sand removal cylinder; The annular space between the oil cylinder and the sand removal cylinder is a sand phase sedimentation chamber, the mixed phase inlet channel is connected to the sand phase sedimentation chamber of the sedimentation chamber channel, and the upper part of the sand phase sedimentation chamber is a liquid phase channel, which is connected to the liquid inlet of the oil cylinder.

2. The downhole gravity-cyclone coupling enhanced de-oiling and de-sanding device for injection and production in the same well according to claim 1 is characterized by: The annular slider is an annular plate with six sliding cylinders, and threads are opened on the sliding cylinders. The incoming sand phase is deposited on the annular slider under the action of gravity sedimentation. The sliding cylinders are threadedly connected to the nuts and axially matched. The annular slider and the sand removal cylinder are nested and connected through the nuts and sliding cylinders.

3. The downhole gravity-cyclone coupling enhanced de-oiling and de-sanding device for injection and production in the same well according to claim 2 is characterized by: The coaxial sleeve serves as an upper passage, and the coaxial sleeve is fixed on the first clamping ring of the oil cylinder through threads.

4. The downhole gravity-cyclone coupling enhanced de-oiling and de-sanding device for injection and production in the same well according to claim 3 is characterized by: The top of the spiral flow channel is a flange, the center of the flange is an overflow port, the flange has four spiral flow channel fixing holes in a circumferential array, threads are opened in the spiral flow channel fixing holes, the threads of the screws fix the flange and the oil cylinder together, and the spiral flow channel cooperates with the cyclone and the axis of the oil cylinder.

5. The downhole gravity-cyclone coupling enhanced de-oiling and de-sanding device for injection and production in the same well according to claim 4 is characterized in that: The oil cylinder is a cylinder with threads on the outer top, the inner middle and upper part, and the outer bottom. The oil cylinder includes an oil cylinder outlet and an oil cylinder liquid inlet. A first clamping ring is provided on the outer wall of the oil cylinder above the oil cylinder liquid inlet, and a second clamping ring is provided on the inner wall of the oil cylinder below the oil cylinder liquid inlet. The first clamping ring is clamped with the coaxial sleeve, and the second clamping ring is clamped with the cyclone. A third clamping ring is provided on the outer wall of the lower end of the oil cylinder, and the third clamping ring is used to fix the position of the sand removal cylinder. The cyclone and the spiral flow channel are placed in the cavity of the oil cylinder.

6. The downhole gravity-cyclone coupling enhanced de-oiling and de-sanding device for injection and production in the same well according to claim 5 is characterized by: The cyclone is a shaft-entered cyclone, which is threadedly connected to the inner wall of the oil cylinder. The cyclone, the oil cylinder and the spiral flow channel are axially matched, and the top surface of the cyclone coincides with the lower surface of the second clamping ring of the oil cylinder, which plays a role in fixing the cyclone.

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