CN116104464A - A kind of anti-sand oil-gas separator based on centrifugal separation - Google Patents

Abstract

The invention relates to the technical field of petroleum exploitation, in particular to a sand-proof oil-gas separator based on centrifugal separation; it includes a separator, which is installed on the bottom of an oil well pump through a plurality of connecting plates, and the separator includes a vertical sleeve and the outer pipe, the top of the outer pipe communicates with the bottom of the oil well pump, the bottom of the outer pipe is closed, and the upper end of the outer pipe is provided with a plurality of radially arranged liquid inlet holes, and the sleeve is set outside the outer pipe. There is a centrifugal filter mechanism between the cylinder and the outer pipe, and an oil-gas separation assembly for discharging gas is provided on the top of the sleeve; in this application, a separator is installed at the bottom of the oil well pump, and the centrifugal separation mechanism in the separator can make the oil rise During the process, the gravel is thrown to the inner wall of the sleeve, then accumulates into blocks and finally settles back to the wellbore due to gravity, and the gas is discharged through the upper oil-gas separation component, thereby realizing the separation of oil, gravel and gas in the oil.

Description

A kind of anti-sand oil-gas separator based on centrifugal separation

technical field

The invention relates to the technical field of oil exploitation, in particular to a sand control oil-gas separator based on centrifugal separation.

Background technique

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 structure of the sandstone layer near the perforation tunnel or at the bottom of the well is destroyed due to loose cementation, low strength of the reservoir, and fluid erosion during oil and gas production, so that the sand particles migrate out of the oil layer with the fluid. In the 1930s, people realized that sand production in the formation would bring harm to oil and gas exploitation, 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 petroleum industry, sand control technology has been continuously improved and matured, and a comprehensive sand control technology system has gradually formed. In the 1930s, the gravel packing sand control method was adopted, and in the 1940s, the chemical sand consolidation method was adopted on a large scale. my country started relatively late. In the 1960s, it began to focus on chemical sand control methods. In the 1970s, it began to study mechanical sand control. In the 1980s, it began to carry out research and application of wire-wound screen gravel packing technology. With the continuous improvement of sand control technology, people have done more research on the sand production mechanism, sand production prediction, and various sand control and sand production measures; the current sand control technology is to install a sand control device, and the crude oil passes through the sand control device. Enter the oil and gas separator, so most of the oil and gas separators do not have sand control performance or are not particularly simple. For oil and gas wells with serious sand production or after fracturing, oil and gas separators without sand control devices will supply the liquid flow containing a large amount of sand To the electric submersible pump, the electric submersible pump is easy to get stuck.

Chinese patent CN110485970B discloses an exhaust sand control device for oil well pumps. This device can filter the gravel in the oil by gravity through a plurality of gravity settling cylinders, and can also separate the gravel in the oil through a centrifugal sand settler, and then separate the sand through exhaust. The device can separate the gas in the oil, however, the application does not disclose the following technical problems:

1. In the prior art, the grit in the oil can be filtered and separated through the gravity settling cylinder and the centrifugal grit settler, but the grit will accumulate in the grit chamber and accumulate for a long time, thus affecting the separation effect;

2. In the prior art, the gas separator can be arranged in the middle of the oil well pump, so that a sealed area cannot be formed in the oil pump, so that when the oil pump is working, the piston in the oil well pump cannot smoothly pump oil into to the top.

Contents of the invention

In view of the above problems, a sand-proof oil-gas separator based on centrifugal separation is provided. By installing a separator at the bottom of the oil well pump, the separator can filter the gravel in the oil, and the centrifugal separation mechanism can make the oil rise. The gravel is thrown to the inner wall of the casing, then accumulates into blocks and finally settles back into the wellbore due to the action of gravity, and the gas is discharged through the upper oil-gas separation component, in which the self-sealing component can realize automatic sealing during the oil pumping process, thus realizing The separation of oil from grit and gas in the oil, and the effect of automatic sealing during the oil pumping process, thus ensuring the smooth operation of the oil well pump.

In order to solve the problems of the prior art, the technical solution adopted in the present invention is:

A sand control oil and gas separator based on centrifugal separation, including an oil well pump with a spherical valve inside the oil well pump, and a separator for sand control and oil and gas separation at the bottom of the oil well pump, the separator is installed on the pump through multiple connecting plates At the bottom of the oil pump, the separator includes a vertical sleeve and an outer tube. The top of the outer tube communicates with the bottom of the oil well pump. The bottom of the outer tube is closed. The liquid hole, the sleeve is set outside the outer tube, a centrifugal filter mechanism is arranged between the sleeve and the outer tube, and an oil-gas separation component for discharging gas is arranged on the top of the sleeve.

Preferably, the diameter of the liquid inlet hole is smaller than that of the gravel.

Preferably, the inside of the outer tube is provided with a vertical central 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 the bottom of the central tube is provided with an opening.

Preferably, the centrifugal filter mechanism is a spiral piece, and the spiral piece is installed between the sleeve and the outer tube.

Preferably, the top of the spiral piece is lower than the bottom of the liquid inlet hole.

Preferably, the bottom of the sleeve is provided with an indented end, and the indented end is provided with a first filter plate for filtering gravel in oil.

Preferably, a ring-shaped second filter plate is also provided inside the sleeve, and the second filter plate is installed horizontally inside the sleeve and is located between the spiral piece and the liquid inlet.

Preferably, the oil-gas separation assembly includes a mist catcher; the mist catcher is circular and installed between the outer tube and the sleeve, and the mist catcher is located above the liquid inlet hole; Automatically complete the self-sealing mechanism that seals the mist catcher, the self-sealing mechanism is installed on the top of the mist catcher and is connected with the ball valve transmission.

Preferably, the self-sealing mechanism includes a connecting plate, a connecting block and a sealing assembly;

The connection plate is disc-shaped and installed horizontally above the mist catcher, the bottom of the connection plate communicates with the mist catcher, and the top of the connection plate has a number of exhaust holes in an annular array;

The connection block is installed horizontally inside the oil pump and connected to the top of the ball valve;

The number of the sealing assembly is the same as the number of the exhaust hole and corresponds one by one, the top of the sealing assembly is connected with the connection block, and the bottom of the sealing assembly abuts against the bottom of the exhaust hole in a working state.

Preferably, the sealing assembly includes a sealing ball, a connecting rod and a limit ring;

The sealing ball is arranged in the connecting plate and is located under the exhaust hole, and the sealing ball is connected with the connecting block through the connecting rod;

The limit ring sleeve is installed on the connecting rod and is located at the side of the oil well pump close to the connecting plate.

The beneficial effects of the present application compared with the prior art are:

1. The present invention uses centrifugal separation to remove sand and separate oil and water, without installing sand control devices, and will not increase costs. At the same time, the oil-gas separation and oil-sand separation processes are integrated, the separation efficiency is high, the separation effect is good, and the follow-up treatment process is simple;

2. The present invention combines the spiral separation and the separation of changing the flow direction of the liquid flow, and performs two oil and gas separations, which is thorough and effective;

3. The invention can effectively remove sand, prevent the pump from being stuck, effectively protect the electric submersible pump from being damaged, and prolong its service life;

4. The oil and gas separation of the present invention is thorough, which effectively prevents the phenomenon of air lock and gas blocking circulation.

Description of drawings

Fig. 1 is a kind of three-dimensional structure schematic diagram of the anti-sand oil-gas separator based on centrifugal separation;

Fig. 2 is a three-dimensional structure sectional view of a sand control oil-gas separator based on centrifugal separation;

Fig. 3 is a partial exploded view of a three-dimensional structure of a sand control oil-gas separator based on centrifugal separation;

Fig. 4 is a kind of partial three-dimensional structural schematic diagram one of the anti-sand oil-gas separator based on centrifugal separation;

Fig. 5 is a sectional view of a local three-dimensional structure of a sand control oil-gas separator based on centrifugal separation;

Fig. 6 is a schematic diagram 2 of a partial three-dimensional structure of a sand control oil-gas separator based on centrifugal separation.

The labels in the figure are:

1-oil pump; 11-spherical valve;

2 - connection plate;

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

4-oil and gas separation assembly; 41-mist catcher; 42-self-sealing mechanism; 421-connection plate; 4211-vent hole; 422-connection block; 423-sealing component; - limit ring.

Detailed ways

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

Referring to Figures 1 to 6, a sand control oil-gas separator based on centrifugal separation includes an oil well pump 1, a spherical valve 11 is provided inside the oil well pump 1, and a valve for sand control and oil-gas separation is provided at the bottom of the oil well pump 1. The separator 3, the separator 3 is installed on the bottom of the oil well pump 1 through a plurality of connecting plates 2, the separator 3 includes a vertical sleeve 31 and an outer tube 32, the top of the outer tube 32 communicates with the bottom of the oil well pump 1, The bottom of the outer tube 32 is closed, the upper end of the outer tube 32 is provided with a plurality of radially arranged liquid inlet holes 321, the sleeve 31 is sleeved on the outside of the outer tube 32, and there is a gap between the sleeve 31 and the outer tube 32. The centrifugal filter mechanism 34, the top of the sleeve 31 is provided with an oil-gas separation assembly 4 for discharging gas.

In the process of oil extraction, in order to improve the quality of oil products and prevent the sand and gravel from being sucked into the oil well pump 1, causing damage to the oil well pump 1, it is necessary to take sand prevention measures. A separator 3 is provided at the bottom of the oil well pump 1. The separator 3 includes a vertical sleeve 31 and an outer tube 32, a centrifugal filter mechanism 34 is provided between the sleeve 31 and the outer tube 32, and an oil-gas separation assembly 4 for discharging gas is provided on the top of the sleeve 31. When the bottom of the cylinder 31 is drawn into the separator 3, the oil passes through the centrifugal filter mechanism 34 at first, and the centrifugal filter mechanism 34 can filter out the grit in the oil. After being discharged from the oil-gas separation assembly 4, the oil can flow into the inside of the outer pipe 32 from the liquid inlet 321, and finally can be sucked into the oil pump from the outer pipe 32, thereby realizing the filtration of the gravel in the oil, and the The gas in the oil is discharged, which avoids the damage of the oil pump caused by the sand and gas in the oil being sucked into the oil pump during the oil pumping process.

Referring to Fig. 2, the diameter of the liquid inlet hole 321 is smaller than that of the gravel.

When the oil is being extracted, in order to prevent the gravel with a small diameter from being drawn into the oil pump, the diameter of the inlet hole 321 can be used to filter, and at the same time there are multiple inlet holes 321, thereby filtering the gravel. It does not affect the speed of oil extraction, and at the same time, the liquid inlet hole 321 can filter the remaining grit in the oil when the oil flows into the outer tube 32. When the oil passes through the centrifugal filter mechanism 34, a small part of the grit will remain, thereby In order to filter out the residual gravel in the petroleum, by setting the diameter of the liquid inlet hole 321 smaller than the diameter of the gravel, the effect of filtering the residual gravel can be achieved when the petroleum passes through the liquid inlet hole 321 .

2, the inside of the outer tube 32 is provided with a vertical central tube 33, and 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 that of the liquid inlet hole 321. Height, the bottom of central tube 33 is provided with opening.

When the gas in the oil needs to be removed again, a central pipe 33 is provided inside the outer pipe 32, and the top of the central pipe 33 is installed inside the outer pipe 32 through a sealing block 331, and the height of the sealing block 331 is higher than the liquid inlet hole 321 height, and the bottom of central tube 33 is provided with opening simultaneously, and when oil flows into outer tube 32 inside from liquid inlet hole 321 on the upper end of outer tube 32, oil will drop to the bottom of outer tube 32, because the difference of gas and liquid density, The gas remaining in the oil will rise, and finally flow out from the oil-gas separation assembly 4 from the rise to the liquid inlet hole 321, so that the setting of the center pipe 33 can change the direction of the oil inflow, so that the oil can be drawn out again after flowing downward, thus realizing The removal of the residual gas in the oil avoids the air lock phenomenon of the oil well pump 1 caused by the gas entering into the oil well pump 1 .

Referring to FIGS. 2 to 3 , the centrifugal filter mechanism 34 is a spiral piece 341 installed between the sleeve 31 and the outer tube 32 .

In the process of oil extraction, when it is necessary to filter out the gravel in the oil, a helical piece 341 is provided between the sleeve 31 and the outer tube 32. Since the density of the gravel and oil is different, the centrifugal force in the helical piece 341 is inconsistent. To achieve the purpose of sand removal, due to the high density of solid gravel, during the oil extraction process, the oil will spiral up along the spiral piece 341, and during this process, the solid gravel will be thrown to the inner wall of the sleeve 31 due to the centrifugal force due to the rotation, and then Accumulate into blocks and finally settle back down due to gravity, so as to achieve the purpose of sand removal.

Referring to FIG. 2 to FIG. 3 , the top of the spiral piece 341 is lower than the bottom of the liquid inlet hole 321 .

During the spiral upward process of oil, in order to ensure the smooth flow of oil from the liquid inlet 321, the top of the spiral piece 341 is set under the liquid inlet 321. The inner wall of the sleeve 31 moves, but due to the high density of the gravel, the gravel will be thrown onto the inner wall of the sleeve 31 due to the centrifugal force, and will eventually accumulate into blocks and settle back to the bottom, while the oil will move along the sleeve 31 One side moves upwards, after passing through the spiral piece 341, the gravel and oil will be separated, and the oil will flow into the liquid inlet hole 321 due to the action of the oil well pump 1, if the spiral piece 341 is arranged above the liquid inlet hole 321, then It will cause the oil to continue to move upward, thereby affecting the efficiency of the oil flowing in from the liquid inlet hole 321 .

As shown in Figure 3, 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 gravel in petroleum.

In the process of oil extraction, in order to increase the filtering effect, a first filter plate 311 is provided at the bottom of the sleeve 31, and the first filter plate 311 is installed horizontally on the bottom of the sleeve 31. Sand will have a great impact on normal production. Sand production in oil wells is the result of loose cementation, low strength, and fluid scouring of reservoirs during oil and gas production, resulting in the destruction of the sandstone layer structure near the perforation tunnel or at the bottom of the well. As the fluid migrates out of the oil reservoir, the first filter plate 311 can filter the larger sand and gravel in the oil well during the production process, so that the preliminary filtration can be completed when the oil is pumped into the separator 3, thereby preventing a large amount of sand and gravel from entering to the separator 3 to affect the filtering effect.

2 to 3, the sleeve 31 is also provided with a ring-shaped second filter plate 312. The second filter plate 312 is installed horizontally inside the sleeve 31 and is located between the spiral piece 341 and the liquid inlet. Between the mouth.

After the oil is filtered by the spiral piece 341, most of the gravel in the oil will spiral up along the inner wall of the sleeve 31 due to centrifugal force during the spiral upward process, then accumulate into blocks and finally settle to the bottom due to gravity operation. , most of the grit is separated, but there is still a small amount of grit in the oil. In order to prevent the grit from flowing into the outer tube 32 from the liquid inlet hole 321 together with the oil, a second filter plate 312 is provided on the top of the spiral piece 341 After the oil is filtered by the spiral piece 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, and at the same time, the second filter plate 312 can break up the gas in the oil. , the dispersed gas can rise and be filtered and discharged from the oil-gas separation assembly 4, and the filtered oil can flow into the inside of the outer pipe 32 from the liquid inlet hole 321, thereby realizing the separation of oil and gas and preventing the gravel from being sucked into the pump Inside of oil pump 1.

2 to 5, the oil-gas separation assembly 4 includes a mist catcher 41; the mist catcher 41 is annular and installed between the outer tube 32 and the sleeve 31, and the mist catcher 41 is located in the liquid inlet 321 above; the mist catcher 41 is provided with a self-sealing mechanism 42 that can automatically complete the sealing of the mist catcher 41 during oil pumping, and the self-sealing mechanism 42 is installed on the top of the mist catcher 41 and is connected to the ball valve 11 .

When it is necessary to complete the gas discharge, a mist catcher 41 is arranged above the cavity formed between the sleeve 31 and the outer tube 32, and the gas passes through the curved channel of the mist eliminator, and is entrained in the air flow under the action of inertial force and gravity The liquid droplets are separated: the gas flows through the demister at a certain speed, and the gas is quickly and continuously changed the direction of motion. Due to the centrifugal force and inertia, the mist in the gas hits the blades of the demister and is captured. Fog 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 demister is discharged, and at the same time, the self-sealing mechanism 42 can prevent the fog from being caught when the oil well pump 1 is upstroke. The device 41 completes the sealing, and realizes that the oil well pump 1 only communicates with the oil well during oil pumping, thereby improving the efficiency of oil pumping. When the oil well pump 1 downstrokes, the self-sealing mechanism 42 can open the mist catcher 41 and communicate with the outside, thereby enabling Realize the emission of gas.

5 to 6, the self-sealing mechanism 42 includes a connecting plate 421, a connecting block 422 and a sealing assembly 423;

The connecting plate 421 is disc-shaped and installed horizontally above the mist catcher 41, the bottom of the connecting plate 421 communicates with the mist catcher 41, and the top of the connecting plate 421 has a number of exhaust holes 4211 in an annular array;

The connection block 422 is horizontally installed inside the oil well pump 1 and connected to the top of the spherical valve 11;

The number of sealing components 423 is the same as the number of exhaust holes 4211 and corresponds one by one. The top of the sealing components 423 is connected to the connection block 422 , and the bottom of the sealing components 423 abuts against the bottom of the exhaust holes 4211 under working conditions.

When it is necessary to control the formation of a sealed area above the mist catcher 41, a connection plate 421 is provided above the mist catcher 41, and the top annular array of the connection plate 421 has several exhaust holes 4211, and the sealing assembly 423 and the exhaust holes 4211 The numbers are the same and corresponding to each other. The sealing assembly 423 is connected to the ball valve 11 through the connecting block 422. When the oil well pump 1 strokes up, the spherical valve 11 moves upward due to the pressure, so that the connecting block 422 can drive the sealing assembly 423 to move upward. , the upward movement of the sealing assembly 423 realizes the sealing of the exhaust hole 4211, thereby realizing the sealing of the connecting plate 421 to the mist catcher 41, ensuring that the oil pumping can be carried out smoothly. , so that the connecting block 422 can drive the sealing assembly 423 to move downward, and the downward movement of the sealing assembly 423 opens the sealing state of the connecting plate 421, thereby realizing the communication between the mist catcher 41 and the outside to achieve the effect of exhaust.

Referring to Fig. 6, the sealing assembly 423 includes a sealing ball 4231, a connecting rod 4232 and a limit ring 4233;

The sealing ball 4231 is arranged in the connecting plate 421 and is located below the exhaust hole 4211, and the sealing ball 4231 is connected with the connecting block 422 through the connecting rod 4232;

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

When the upward movement of the connecting block 422 makes the sealing assembly 423 move upward, when it is necessary to complete the sealing effect on the exhaust hole 4211 on the connecting plate 421, it is connected to the connecting block 422 through the connecting rod 4232, and the bottom of the connecting rod 4232 is connected to the sealing ball 4231 Connection, the sealing ball 4231 is arranged below the vent hole 4211, when the connecting block 422 moves upward, the connecting rod 4232 can move the sealing ball 4231 upward, so that the sealing ball 4231 can block the bottom of the vent hole 4211, thereby realizing To improve the sealing effect on the vent hole 4211, similarly, when the connecting block 422 moves downward, the vent hole 4211 needs to be opened, and the downward movement of the connecting block 422 makes the connecting rod 4232 drive the sealing ball 4231 to move downward, thereby making the The sealing ball 4231 is separated from the exhaust hole 4211 to achieve the effect of exhaust; the limit ring 4233 is installed on the connecting rod 4232 and it is located on the side of the oil well pump 1 close to the connection plate 421. When the oil well pump 1 strokes up, the limit The ring 4233 abuts against the bottom of the oil well pump 1. At this time, the sealing ball 4231 can just complete the sealing of the exhaust hole 4211. The setting of the limit ring 4233 avoids the damage of the connecting plate 421 caused by the upward movement of the sealing assembly 423. Simultaneously, it also prevents the spherical valve 11 from moving upwards excessively.

The above examples only represent one or several implementations of the present invention, and the descriptions thereof are more specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. The utility model provides a sand control oil and gas separator based on centrifugal separation effect, including oil-well pump (1), oil-well pump (1) inside is equipped with ball valve (11), its characterized in that, oil-well pump (1)'s bottom is equipped with and is used for sand control and carries out oil and gas separation's separator (3), separator (3) are installed in oil-well pump (1)'s bottom through a plurality of connecting plates (2), separator (3) are including being vertical form sleeve (31) and outer tube (32), the top of outer tube (32) communicates with oil-well pump (1)'s bottom, the bottom of outer tube (32) is closed form, the upper end of outer tube (32) is equipped with a plurality of feed liquor holes (321) that are radial setting, sleeve (31) cover is established in the outside of outer tube (32), be equipped with centrifugal filter mechanism (34) between sleeve (31) and outer tube (32), the top of sleeve (31) is equipped with oil and gas separation subassembly (4) that are used for exhaust gas.

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

3. The sand-prevention oil-gas separator based on centrifugal separation according to claim 1, wherein a vertical central tube (33) is arranged in the outer tube (32), the top of the central tube (33) is arranged in the outer tube (32) through a sealing block (331), the height of the sealing block (331) is higher than that of the liquid inlet hole (321), and an opening is arranged at the bottom of the central tube (33).

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

5. The centrifugal separation-based sand control oil and gas separator according to claim 4, wherein 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 a setback end, on which is provided a first filter plate (311) for filtering sand in oil.

7. The sand-preventing oil-gas separator based on centrifugal separation according to claim 6, wherein a second filter plate (312) in a circular ring shape is further arranged in the sleeve (31), and the second filter plate (312) is horizontally arranged in the sleeve (31) and is positioned between the spiral sheet (341) and the liquid inlet.

8. The sand control oil and gas separator based on centrifugal separation according to claim 1, characterized in that the oil and gas separation assembly (4) comprises a mist catcher (41); the mist catcher (41) is in a circular ring shape and is arranged between the outer tube (32) and the sleeve (31), and the mist catcher (41) is positioned 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) during oil pumping, and the self-sealing mechanism (42) is arranged at the top of the mist catcher (41) and is in transmission connection with the spherical valve (11).

9. The centrifugal separation based sand control oil and gas separator of claim 8 wherein the self-sealing mechanism (42) comprises a connecting disc (421), a connecting block (422) and a sealing assembly (423);

the connecting disc (421) is disc-shaped and horizontally arranged above the mist catcher (41), the bottom of the connecting disc (421) is communicated with the mist catcher (41), and a plurality of exhaust holes (4211) are annularly arranged at the top of the connecting disc (421);

the connecting block (422) is horizontally arranged in the oil pump (1) and is connected with the top of the spherical valve (11);

the number of the sealing assemblies (423) is the same as that of the exhaust holes (4211) and corresponds to that of the exhaust holes one by one, the top of the sealing assemblies (423) is connected with the connecting block (422), and the bottom of the sealing assemblies (423) is abutted with the bottom of the exhaust holes (4211) in the working state.

10. The centrifugal separation based sand control oil and gas separator of claim 9 wherein the seal assembly (423) comprises a seal ball (4231), a connecting rod (4232) and a stop collar (4233);

the sealing ball (4231) is arranged in the connecting disc (421) and is positioned below the exhaust hole (4211), and the sealing ball (4231) is connected with the connecting block (422) through the connecting rod (4232);

the limiting ring (4233) is sleeved on the connecting rod (4232) and is positioned on one side of the oil pump (1) close to the connecting disc (421).

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