A sand control oil and gas separator based on centrifugal separation

Abstract

The present invention relates to the technical field of oil extraction, and specifically relates to a sand control oil-gas separator based on centrifugal separation; it includes a separator, the separator is installed at the bottom of a sucker rod pump through a plurality of connecting plates, the separator includes a vertically arranged sleeve and an outer pipe, the top of the outer pipe is communicated with the bottom of the sucker rod pump, the bottom of the outer pipe is closed, a plurality of radially arranged liquid inlet holes are provided at the upper end of the outer pipe, the sleeve is sleeved outside the outer pipe, a centrifugal filtration mechanism is arranged between the sleeve and the outer pipe, and an oil-gas separation assembly for discharging gas is provided at the top of the sleeve; in this application, a separator is installed at the bottom of the sucker rod pump, and the centrifugal separation mechanism in the separator can cause the sand and gravel to be thrown to the inner wall of the sleeve during the upward movement of the oil, and then accumulate into blocks and finally settle back to the wellbore due to gravity, and the gas is discharged through the oil-gas separation assembly above, thereby realizing the separation of oil, sand and gravel and gas in the oil.

Description

Technical Field

[0001] The present invention relates to the technical field of oil extraction, and specifically relates to a sand control oil and gas separator based on centrifugal separation. Background Art

[0002] Sand production in oil and gas wells is a phenomenon often encountered in oil production. Sand production in oil and gas wells will have a great impact on normal production. Sand production in oil wells is a phenomenon in which the sandstone layer structure near the perforation holes or at the bottom of the well is damaged due to loose reservoir cementation, low strength, and fluid erosion during the oil and gas extraction process, causing sand grains to migrate out of the oil layer with the fluid. In the 1930s, people realized that formation sand production would harm oil and gas extraction, and sand control measures must be taken to increase the production of oil and gas wells and prevent accidents. With the rapid development of the world's oil industry, sand control technology has been continuously improved and has become increasingly mature, gradually forming a comprehensive sand control technology system. In the 1930s, the gravel packing sand control method began to be used, and in the 1940s, the chemical sand consolidation method began to be widely used. China started relatively late. In the 1960s, it began to focus on researching chemical sand control methods. In the 1970s, it began to research mechanical sand control. In the 1980s, it began to carry out research and application of wire-wrapped screen gravel packing technology. With the continuous improvement of sand control technology, people have conducted more research on the formation sand production mechanism, sand production prediction, and various sand control and sand production prevention measures. One current sand control technology is to install a sand control device. Crude oil enters the oil and gas separator through the sand control device. Therefore, most oil and gas separators do not have sand control performance or are not particularly simple. For oil and gas wells with severe sand production or after fracturing, the oil and gas separator without a sand control device supplies the liquid flow containing a large amount of sand to the electric submersible pump, resulting in the electric submersible pump being prone to pump jamming.

[0003] An exhaust and sand control device for a sucker rod pump disclosed in Chinese Patent CN110485970B can filter out the sand and gravel in the oil through multiple gravity settling cylinders, and can also separate the sand and gravel in the oil through a centrifugal sand separator, and then can separate the gas in the oil through an exhaust separator. However, the following technical problems are not disclosed in this application:

[0004] 1. In the prior art, the sand and gravel in the oil can be filtered and separated through the gravity settling cylinder and the centrifugal sand separator, but the sand and gravel will accumulate in the sand settling chamber, and over time, it will cause accumulation, thereby affecting the separation effect;

[0005] 2. In the prior art, the gas separator can be arranged in the middle of the sucker rod pump, so that a sealed area cannot be formed in the oil pump. Therefore, when the oil pump works, the piston in the sucker rod pump cannot smoothly pump the oil to the upper part. Summary of the Invention

[0006] In view of the above problems, a sand-proof oil-gas separator based on centrifugal separation is provided, in which a separator is installed at the bottom of the oil pump, and the separator can filter the sand and gravel in the oil, wherein the centrifugal separation mechanism can make the sand and gravel be thrown to the inner wall of the sleeve during the rising process of the oil, and then accumulate into blocks and finally settle back into the wellbore due to gravity, and the gas is discharged through the oil and gas separation component above, wherein the self-sealing component can realize automatic sealing during the oil pumping process, thereby realizing the separation of oil from sand and gas in the oil, and the effect of automatic sealing during the oil pumping process, thereby ensuring the smooth operation of the oil pumping.

[0007] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0008] A sand-control oil-gas separator based on centrifugal separation comprises an oil pump, a ball valve is arranged inside the oil pump, a separator for sand control and oil-gas separation is arranged at the bottom of the oil pump, the separator is installed at the bottom of the oil pump through a plurality of connecting plates, the separator comprises a vertical sleeve and an outer tube, the top of the outer tube is connected to the bottom of the oil pump, the bottom of the outer tube is closed, a plurality of radially arranged liquid inlet holes are arranged at the upper end of the outer tube, the sleeve is sleeved on the outside of the outer tube, a centrifugal filtering mechanism is arranged between the sleeve and the outer tube, and an oil-gas separation component for exhausting gas is arranged at the top of the sleeve.

[0009] Preferably, the diameter of the liquid inlet hole is smaller than the diameter of the gravel.

[0010] Preferably, a vertical central tube is provided inside the outer tube, the top of the central tube is installed inside the outer tube through a sealing block, the height of the sealing block is higher than the height of the liquid inlet hole, and an opening is provided at the bottom of the central tube.

[0011] Preferably, the centrifugal filtering mechanism is a spiral blade, which is installed between the sleeve and the outer tube.

[0012] Preferably, the top of the spiral sheet is lower than the bottom of the liquid inlet hole.

[0013] Preferably, a retracted end is provided at the bottom of the sleeve, and a first filter plate for filtering sand and gravel in petroleum is provided on the retracted end.

[0014] Preferably, a second filter plate in the shape of a circular ring is further provided in the sleeve, and the second filter plate is horizontally installed inside the sleeve and is located between the spiral sheet and the liquid inlet.

[0015] Preferably, the oil-gas separation assembly includes a mist catcher; the mist catcher is annular and is installed between the outer tube and the sleeve, and the mist catcher is located above the liquid inlet hole; the mist catcher is provided with a self-sealing mechanism that can automatically seal the mist catcher when pumping oil, and the self-sealing mechanism is installed on the top of the mist catcher and is connected to the ball valve in a transmission manner.

[0016] Preferably, the self-sealing mechanism includes a connection disk, a connection block, and a sealing assembly;

[0017] The connection disk is disk-shaped and is horizontally installed above the mist eliminator. The bottom of the connection disk communicates with the mist eliminator, and a plurality of exhaust holes are annularly arranged on the top of the connection disk;

[0018] The connection block is horizontally installed inside the oil pump and is connected to the top of the spherical valve;

[0019] The number of the sealing assemblies is the same as that of the exhaust holes and they correspond one by one. The top of the sealing assembly is connected to the connection block, and the bottom of the sealing assembly abuts against the bottom of the exhaust hole in the working state.

[0020] Preferably, the sealing assembly includes a sealing ball, a connecting rod, and a limiting ring;

[0021] The sealing ball is arranged inside the connection disk and is located below the exhaust hole. The sealing ball is connected to the connection block through the connecting rod;

[0022] The limiting ring is sleeved on the connecting rod and is located on the side of the oil pump close to the connection disk.

[0023] The beneficial effects of this application compared with the prior art are as follows:

[0024] 1. The present invention uses the centrifugal separation effect for sand removal and oil-water separation, without the need to install a sand control device, and does not increase costs. At the same time, the processes of oil-gas separation and oil-sand separation are integrated, with high separation efficiency, good separation effect, and simple subsequent treatment processes;

[0025] 2. The present invention combines spiral separation and separation by changing the flow direction of the liquid flow to perform two-stage oil-gas separation, with thorough separation and good effect;

[0026] 3. The present invention can effectively remove sand, prevent pump jamming, effectively protect the electrical submersible pump from being damaged, and extend its service life;

[0027] 4. The present invention has thorough oil-gas separation, effectively preventing the occurrence of gas locking and gas blockage in the flow passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a three-dimensional structural schematic diagram of a sand control oil-gas separator based on the centrifugal separation effect;

[0029] Figure 2 is a three-dimensional structural sectional view of a sand control oil-gas separator based on the centrifugal separation effect;

[0030] Figure 3 is a three-dimensional structural partial decomposition view of a sand control oil-gas separator based on the centrifugal separation effect;

[0031] Figure 4 Schematic diagram of the partial three-dimensional structure of a sand control oil and gas separator based on centrifugal separation Figure 1 ;

[0032] Figure 5 It is a sectional view of the partial three-dimensional structure of a sand control oil and gas separator based on centrifugal separation;

[0033] Figure 6 Schematic diagram of the partial three-dimensional structure of a sand control oil and gas separator based on centrifugal separation Figure 2 。

[0034] The reference numerals in the figure are:

[0035] 1 - oil extraction pump; 11 - ball valve;

[0036] 2 - connecting plate;

[0037] 3 - separator; 31 - sleeve; 311 - first filter plate; 312 - second filter plate; 32 - outer tube; 321 - liquid inlet hole; 33 - central tube; 331 - sealing block; 34 - centrifugal filtration mechanism; 341 - spiral fin

[0038] 4 - oil and gas separation component; 41 - mist eliminator; 42 - self - sealing mechanism; 421 - connecting disc; 4211 - exhaust hole; 422 - connecting block; 423 - sealing component; 4231 - sealing ball; 4232 - connecting rod; 4233 - limiting ring Specific embodiments

[0039] In order to further understand the features, technical means, and specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0040] See Figures 1 to 6 As shown, a sand control oil and gas separator based on centrifugal separation includes an oil extraction pump 1. A ball valve 11 is provided inside the oil extraction pump 1. A separator 3 for sand control and oil and gas separation is provided at the bottom of the oil extraction pump 1. The separator 3 is installed at the bottom of the oil extraction pump 1 through a plurality of connecting plates 2. The separator 3 includes a vertically arranged sleeve 31 and an outer tube 32. The top of the outer tube 32 is communicated with the bottom of the oil extraction pump 1. The bottom of the outer tube 32 is closed. A plurality of radially arranged liquid inlet holes 321 are provided at the upper end of the outer tube 32. The sleeve 31 is sleeved outside the outer tube 32. A centrifugal filtration mechanism 34 is provided between the sleeve 31 and the outer tube 32. An oil and gas separation component 4 for discharging gas is provided at the top of the sleeve 31.

[0041] During the oil extraction process, in order to improve the quality of the oil product and prevent sand and gravel from being pumped into the oil pump 1, causing damage to the oil pump 1, sand control measures need to be taken. A separator 3 is provided at the bottom of the oil pump 1. The separator 3 includes a vertical sleeve 31 and an outer tube 32. A centrifugal filtration mechanism 34 is provided between the sleeve 31 and the outer tube 32. An oil-gas separation component 4 for discharging gas is provided at the top of the sleeve 31. When the oil is pumped into the separator 3 from the bottom of the sleeve 31, the oil first passes through the centrifugal filtration mechanism 34, which can filter out the sand and gravel in the oil. At this time, there is some gas in the oil, and the gas in the oil can be discharged from the upper oil-gas separation component 4. The oil can then flow into the interior of the outer tube 32 through the liquid inlet hole 321 and finally be pumped into the oil pump from the outer tube 32, thus achieving the filtration of sand and gravel in the oil and the discharge of gas in the oil, and avoiding the damage to the oil pump caused by pumping the sand and gravel and gas in the oil into the interior of the oil pump during the oil pumping process.

[0042] See Figure 2 As shown, the diameter of the liquid inlet hole 321 is smaller than the diameter of the sand and gravel.

[0043] During the oil extraction process, in order to prevent sand and gravel with a smaller diameter from being pumped into the oil pump, setting the diameter of the liquid inlet hole 321 can play a filtering role. At the same time, there are multiple liquid inlet holes 321, so as not to affect the oil extraction speed when filtering sand and gravel. At the same time, the liquid inlet hole 321 can filter the remaining sand and gravel in the oil when the oil flows into the interior of the outer tube 32. When the oil passes through the centrifugal filtration mechanism 34, a small part of the sand and gravel will remain. Therefore, in order to filter the remaining sand and gravel in the oil, by setting the diameter of the liquid inlet hole 321 to be smaller than the diameter of the sand and gravel, the effect of filtering the remaining sand and gravel can be achieved when the oil passes through the liquid inlet hole 321.

[0044] See Figure 2 As shown, a vertical central tube 33 is provided inside the outer tube 32. The top of the central tube 33 is installed inside the outer tube 32 through a sealing block 331. The height of the sealing block 331 is higher than the height of the liquid inlet hole 321. The bottom of the central tube 33 is provided with an opening.

[0045] When it is necessary to remove the gas in the oil again, a central tube 33 is provided inside the outer tube 32. The top of the central tube 33 is installed inside the outer tube 32 through a sealing block 331, and the height of the sealing block 331 is higher than that of the liquid inlet hole 321. At the same time, an opening is provided at the bottom of the central tube 33. When the oil flows into the inside of the outer tube 32 from the liquid inlet hole 321 at the upper end of the outer tube 32, the oil will drop to the bottom of the outer tube 32. Due to the different densities of gas and liquid, the residual gas in the oil will rise and finally flow out from the oil-gas separation assembly 4 when it rises to the liquid inlet hole 321. Therefore, the setting of the central tube 33 can change the flowing direction of the oil, so that the oil flows downward and is pumped out again, thereby realizing the removal of the residual gas in the oil and avoiding the gas lock phenomenon of the oil pump 1 caused by the gas entering the oil pump 1.

[0046] See Figures 2 to 3 As shown, the centrifugal filtering mechanism 34 is a spiral piece 341, and the spiral piece 341 is installed between the sleeve 31 and the outer tube 32.

[0047] During the oil extraction process, when it is necessary to filter out the sand and gravel in the oil, a spiral piece 341 is provided between the sleeve 31 and the outer tube 32. Due to the different densities of the sand and gravel and the oil, the centrifugal forces received in the spiral piece 341 are inconsistent, so as to achieve the purpose of sand removal. Since the density of the solid sand and gravel is relatively large, during the oil extraction process, the oil will spiral upward along the spiral piece 341. During this process, the solid sand and gravel will be thrown onto the inner wall of the sleeve 31 due to the centrifugal force generated by rotation, and then accumulate into blocks and finally settle back downward due to the action of gravity, thereby achieving the purpose of sand removal.

[0048] See Figures 2 to 3 As shown, the top of the spiral piece 341 is lower than the bottom of the liquid inlet hole 321.

[0049] During the spiral upward process of the oil, in order to ensure that the oil flows smoothly into the liquid inlet hole 321, the top of the spiral piece 341 is arranged below the liquid inlet hole 321. When the oil passes through the spiral piece 341, both the sand and gravel and the oil will move toward the inner wall of the sleeve 31 due to the centrifugal force. However, due to the relatively large density of the sand and gravel, the sand and gravel will be thrown onto the inner wall of the sleeve 31 due to the centrifugal force and finally accumulate into blocks and settle back to the bottom, while the oil will move upward along the side close to the sleeve 31. When passing through the spiral piece 341, the sand and gravel and the oil will be separated. The oil flows toward the liquid inlet hole 321 due to the action of the oil pump 1. If the spiral piece 341 is arranged above the liquid inlet hole 321, it will cause the oil to continue to move upward, thus affecting the flowing efficiency of the oil into the liquid inlet hole 321.

[0050] See Figure position Figure 3 As shown, the bottom of the sleeve 31 is provided with a retracted end, and a first filter plate 311 for filtering the sand and gravel in the oil is provided on the retracted end.

[0051] During the oil extraction process, in order to increase the filtering effect, a first filter plate 311 is provided at the bottom of the sleeve 31. The first filter plate 311 is horizontally installed at the bottom of the sleeve 31. During the oil production process, sand production in oil and gas wells will have a great impact on normal production. Sand production in oil wells is a phenomenon in which the sandstone layer structure near the perforation channel or at the bottom of the well is destroyed due to loose reservoir cementation, low strength, and fluid scouring during oil and gas production, causing sand particles to migrate from the oil layer with the fluid. The first filter plate 311 can filter larger gravel in the oil well during the production process, so that preliminary filtration can be completed when the oil is pumped into the separator 3, thereby avoiding a large amount of gravel from entering the separator 3 and affecting the filtering effect.

[0052] See also Figures 2 to 3 As shown, a second filter plate 312 in a circular ring shape is further provided in the sleeve 31 . The second filter plate 312 is horizontally installed inside the sleeve 31 and is located between the spiral sheet 341 and the liquid inlet.

[0053] After the oil is filtered by the spiral sheet 341, most of the gravel in the oil spirals up along the inner wall of the sleeve 31 due to centrifugal force during the spiral ascent, then accumulates into blocks and finally settles to the bottom due to gravity. At this time, most of the gravel is separated, but a small amount of gravel still exists in the oil. In order to prevent the gravel from flowing into the inner part of the outer tube 32 from the liquid inlet hole 321 along with the oil, a second filter plate 312 is provided on the top of the spiral sheet 341. After the oil is filtered by the spiral sheet 341, it is filtered again by the second filter plate 312. The second filter plate 312 can filter out a small amount of gravel in the oil. At the same time, the second filter plate 312 can disperse the gas in the oil. The dispersed gas can rise and be filtered and discharged from the oil-gas separation component 4. The filtered oil can flow into the inner part of the outer tube 32 from the liquid inlet hole 321, thereby realizing the separation of oil and gas and preventing the gravel from being sucked into the inner part of the oil pump 1.

[0054] See also Figures 2 to 5 As shown, the oil-gas separation component 4 includes a mist catcher 41; the mist catcher 41 is annular and is installed between the outer tube 32 and the sleeve 31, and the mist catcher 41 is located above the liquid inlet hole 321; the mist catcher 41 is provided with a self-sealing mechanism 42 that can automatically seal the mist catcher 41 when pumping oil, and the self-sealing mechanism 42 is installed on the top of the mist catcher 41 and is connected to the ball valve 11 in a transmission manner.

[0055] When it is necessary to complete the gas discharge, a mist collector 41 is arranged above the cavity formed between the sleeve 31 and the outer tube 32. The gas passes through the curved channel of the mist collector, and the droplets entrained in the airflow are separated under the action of inertia and gravity: the gas flows through the mist collector at a certain speed, and the gas is quickly and continuously changed in direction. Due to the action of centrifugal force and inertia, the droplets in the gas hit the mist collector blades and are captured. The droplets gather to form a water flow, and due to the action of gravity, they fall into the slurry pool, realizing gas-liquid separation, so that the gas flowing through the mist collector is discharged. At the same time, the self-sealing mechanism 42 can seal the mist collector 41 when the oil pump 1 is in the upstroke, so that the oil pump 1 is only connected to the oil well during oil pumping, thereby improving the efficiency of oil pumping. When the oil pump 1 is in the downstroke, the self-sealing mechanism 42 can open the mist collector 41 to connect with the outside, so as to realize the gas discharge.

[0056] See also Figures 5 to 6 As shown, the self-sealing mechanism 42 includes a connecting plate 421, a connecting block 422 and a sealing assembly 423;

[0057] The connecting disk 421 is in the shape of a disk and is installed horizontally above the mist catcher 41. The bottom of the connecting disk 421 is connected to the mist catcher 41. The top of the connecting disk 421 has a plurality of exhaust holes 4211 in a circular array.

[0058] The connecting block 422 is horizontally installed inside the oil well pump 1 and is connected to the top of the ball valve 11;

[0059] The number of the sealing components 423 is the same as the number of the exhaust holes 4211 and corresponds one to one. The top of the sealing component 423 is connected to the connecting block 422, and the bottom of the sealing component 423 abuts against the bottom of the exhaust hole 4211 in the working state.

[0060] When it is necessary to control the formation of a sealing area above the mist catcher 41, a connecting disk 421 is provided above the mist catcher 41. The top annular array of the connecting disk 421 has a plurality of exhaust holes 4211. The number of sealing components 423 and the exhaust holes 4211 are the same and correspond one to one. The sealing component 423 is transmission-connected to the ball valve 11 through the connecting block 422. When the oil pump 1 is in an upward stroke, the ball valve 11 moves upward due to the pressure, so that the connecting block 422 can drive the sealing component 423 to move upward. The upward movement of the sealing component 423 realizes the sealing of the exhaust holes 4211, thereby realizing the sealing of the mist catcher 41 by the connecting disk 421, ensuring that the oil pumping can proceed smoothly. When the oil pump 1 is in a downward stroke, the spherical direction is reset downward, so that the connecting block 422 can drive the sealing component 423 to move downward. The downward movement of the sealing component 423 opens the sealing state of the connecting disk 421, thereby realizing the connection between the mist catcher 41 and the outside, achieving the exhaust effect.

[0061] See alsoFigure 6 As shown, the sealing assembly 423 includes a sealing ball 4231, a connecting rod 4232, and a limiting ring 4233;

[0062] The sealing ball 4231 is arranged inside the connecting plate 421 and is located below the exhaust hole 4211. The sealing ball 4231 is connected to the connecting block 422 through the connecting rod 4232;

[0063] The limiting ring 4233 is sleeved on the connecting rod 4232 and is located on the side of the oil extraction pump 1 close to the connecting plate 421.

[0064] When the upward movement of the connecting block 422 causes the sealing assembly 423 to move upward and it is necessary to complete the sealing effect of the exhaust hole 4211 on the connecting plate 421, it is connected through the connecting rod 4232 and the connecting block 422. The bottom of the connecting rod 4232 is connected to the sealing ball 4231. The sealing ball 4231 is arranged below the exhaust hole 4211. When the connecting block 422 moves upward, the connecting rod 4232 can cause the sealing ball 4231 to move upward, so that the sealing ball 4231 can block the lower part of the exhaust hole 4211, thus realizing the sealing effect of the exhaust hole 4211. Similarly, when the connecting block 422 moves downward and it is necessary to open the exhaust hole 4211, the downward movement of the connecting block 422 causes the connecting rod 4232 to drive the sealing ball 4231 to move downward, so that the sealing ball 4231 is separated from the exhaust hole 4211, achieving the exhaust effect; The limiting ring 4233 is installed on the connecting rod 4232 and is located on the side of the oil extraction pump 1 close to the connecting plate 421. When the oil extraction pump 1 strokes upward, the limiting ring 4233 abuts against the bottom of the oil extraction pump 1. At this time, the sealing ball 4231 can just complete the sealing of the exhaust hole 4211. The setting of the limiting ring 4233 avoids the damage of the connecting plate 421 caused by the upward movement of the sealing assembly 423, and also avoids the excessive upward movement of the spherical valve 11.

[0065] The above embodiments only represent one or several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A sand control oil and gas separator based on centrifugal separation, comprising a sucker rod pump (1), and a ball valve (11) is arranged inside the sucker rod pump (1). It is characterized in that, A separator (3) for sand prevention and oil-gas separation is provided at the bottom of the oil well pump (1). The separator (3) is installed at the bottom of the oil well pump (1) through a plurality of connecting plates (2). The separator (3) comprises a vertical sleeve (31) and an outer tube (32). The top of the outer tube (32) is connected to the bottom of the oil well pump (1). The bottom of the outer tube (32) is closed. A plurality of radially arranged liquid inlet holes (321) are provided at the upper end of the outer tube (32). The sleeve (31) is sleeved on the outside of the outer tube (32). A centrifugal filtering mechanism (34) is provided between the sleeve (31) and the outer tube (32). An oil-gas separation component (4) for exhausting gas is provided at the top of the sleeve (31). The oil-gas separation assembly (4) comprises a mist catcher (41); the mist catcher (41) is annular and is installed between the outer tube (32) and the sleeve (31), and the mist catcher (41) is located above the liquid inlet hole (321); the mist catcher (41) is provided with a self-sealing mechanism (42) capable of automatically sealing the mist catcher (41) when pumping oil, and the self-sealing mechanism (42) is installed on the top of the mist catcher (41) and is drivingly connected to the ball valve (11); The self-sealing mechanism (42) comprises a connecting plate (421), a connecting block (422) and a sealing assembly (423); The connecting plate (421) is in the shape of a disk and is horizontally installed above the mist catcher (41). The bottom of the connecting plate (421) is connected to the mist catcher (41). The top of the connecting plate (421) has a plurality of exhaust holes (4211) in a circular array. The connecting block (422) is installed horizontally inside the oil pump (1) and is connected to the top of the ball valve (11); The number of the sealing components (423) is the same as the number of the exhaust holes (4211) and corresponds one to one. The top of the sealing component (423) is connected to the connecting block (422), and the bottom of the sealing component (423) abuts against the bottom of the exhaust hole (4211) in the working state.

2. The sand control oil and gas separator based on centrifugal separation according to claim 1, wherein, The diameter of the liquid inlet hole (321) is smaller than the diameter of the gravel.

3. The sand control oil and gas separator based on centrifugal separation according to claim 1, wherein A vertical central tube (33) is provided inside the outer tube (32). The top of the central tube (33) is installed inside the outer tube (32) via a sealing block (331). The height of the sealing block (331) is higher than the height of the liquid inlet hole (321). An opening is provided at the bottom of the central tube (33).

4. A sand control oil and gas separator based on centrifugal separation according to claim 1, characterized in that The centrifugal filtering mechanism (34) is a spiral sheet (341), and the spiral sheet (341) is installed between the sleeve (31) and the outer tube (32).

5. The sand control oil and gas separator based on centrifugal separation according to claim 4, characterized in that, The top of the spiral sheet (341) is lower than the bottom of the liquid inlet hole (321).

6. A sand control oil and gas separator based on centrifugal separation according to claim 1, characterized in that, The bottom of the sleeve (31) is provided with an indented end, and the indented end is provided with a first filter plate (311) for filtering sand and gravel in petroleum.

7. The sand control oil and gas separator based on centrifugal separation according to claim 6, characterized in that, A second filter plate (312) in the shape of a circular ring is also provided in the sleeve (31). The second filter plate (312) is installed horizontally inside the sleeve (31) and is located between the spiral sheet (341) and the liquid inlet.

8. A sand control oil and gas separator based on centrifugal separation according to claim 1, characterized in that, The sealing assembly (423) includes a sealing ball (4231), a connecting rod (4232) and a limiting ring (4233); The sealing ball (4231) is arranged inside the connecting plate (421) and is located below the exhaust hole (4211). The sealing ball (4231) is connected to the connecting block (422) through a connecting rod (4232). The limiting ring (4233) is sleeved on the connecting rod (4232) and is located on the side of the oil pump (1) close to the connecting plate (421).

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