Gravel filtering equipment used in oil exploitation process

Abstract

The invention relates to the technical field of gravel filtering, and discloses gravel filtering equipment used in the oil exploitation process, the gravel filtering equipment comprises a separation assembly, a liquid discharging assembly is arranged at the upper end of the separation assembly, a sand discharging assembly is arranged at the bottom end of the separation assembly, the separation assembly comprises a column casing shell, and an inner column casing is fixedly sleeved with the column casing shell; a conical shell is fixedly connected to the bottom end of the column casing shell, a first conical barrel is fixedly sleeved with the conical shell, a pair of first flange rings is fixedly sleeved between the column casing shell and the conical shell, a second conical barrel is fixedly connected to the bottom end of the conical shell, and a pair of second flange rings is fixedly sleeved between the second conical barrel and the conical shell. The upper end of the column casing shell is fixedly connected with a bottom layer plate, the upper end of the bottom layer plate is fixedly provided with an upper layer plate, the column casing shell and the inner column casing are both provided with tangential connecting channels, and the device can solve the problem that a large amount of large-particle gravel is prone to being blocked at a discharge port.

Description

Technical Field

[0001] The invention relates to the technical field of sand and gravel filtering, and more specifically to a sand and gravel filtering device used in the process of oil production. Background Art

[0002] During the oil extraction process, there will be many sand and gravel impurities. If not filtered, the sand may damage the equipment, such as wearing pumps, pipes and other processing equipment, and may also block the oil layer and reduce production efficiency. Therefore, it is necessary to effectively remove the sand to ensure smooth production, extend equipment life and improve economic benefits. Therefore, in the prior art, a cyclone sand removal device is used to remove sand and gravel from petroleum. However, the cyclone sand removal device in the prior art still has the following shortcomings in actual use: First, when the cyclone sand removal device under the prior art is performing sand removal, the fluid enters along the tangential direction at a certain pressure to form a rotating flow. During the rotation process, the solid particles with a larger density are thrown to the wall due to the centrifugal force, and move downward along the conical section, and finally discharged from the bottom flow port, while the liquid with a smaller density gathers to the central low-pressure area to form an upward internal vortex, which is discharged through the overflow port. However, in actual conditions, there are still some fine sand and gravel particles. Due to their small volume and light weight, they will rotate and flow above the cylinder with the liquid with a smaller density and are difficult to fall. Therefore, they are easy to gather to the central low-pressure area with the liquid with a smaller density, thereby limiting the separation performance of the device; Secondly, when the cyclone sand removal device under the prior art is removing sand, large sand and gravel with high density will be discharged at the bottom of the conical section. When the number of these large sand and gravel particles is large, it is easy to cause blockage at the bottom of the conical section, and the cyclone sand removal device under the prior art cannot effectively solve this blockage problem; Therefore, in order to solve the above problems, it is necessary to provide a sand and gravel filtering device for use in the oil production process. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a sand and gravel filtering device for use in the oil production process to solve the problems existing in the above-mentioned background technology.

[0004] The present invention provides the following technical solution: a sand and gravel filtering device used in the process of oil extraction, comprising a separation component, wherein the upper end of the separation component is provided with a liquid discharge component, and the bottom end of the separation component is provided with a sand discharge component; The cam is connected with the first end of the cam and the second end of the cam is connected with the first end of the cam, and the cam is connected with the first end of the cam and the second end of the cam is connected with the first end of the cam.

[0005] Furthermore, the drainage assembly includes a pipe sleeve bin, which is fixedly installed on the upper end of the upper plate, a sand collecting trough is opened inside the pipe sleeve bin, a cover sleeve bin is provided on the upper end of the pipe sleeve bin, a filter ring is fixedly sleeved between the inner wall of the cover sleeve bin and the inner wall of the pipe sleeve bin, a sealing ring is fixedly sleeved at the outer ends of the pipe sleeve bin and the cover sleeve bin, a lower connecting flange is fixedly sleeved at the inner circle of the cover sleeve bin, an overflow pipe is fixedly sleeved at the inner circle of the lower connecting flange, an upper connecting flange is fixedly connected to the upper end of the lower connecting flange, an upper connecting pipe is fixedly sleeved to the inner circle of the upper connecting flange, a drainage pipe is fixedly connected to the upper end of the upper connecting pipe, and a capillary tube is fixedly connected to the outer side of the sealing ring.

[0006] Furthermore, the sand removal assembly includes a bottom connecting ring, which is fixedly mounted on the bottom end of the second conical cylinder, and the bottom connecting ring is provided with evenly distributed through holes, and an upper cavity column is fixedly mounted on the bottom end of the bottom connecting ring, and the internal space of the upper cavity column is connected with the outside through the through hole, and a movable column sleeve is movably sleeved at the bottom of the upper cavity column, and a pressure-bearing ring leaf is provided on the inner wall of the movable column sleeve, and a fixed sleeve is fixedly sleeved on the outer side of the bottom end of the upper cavity column, and a lower cavity column is fixedly sleeved on the inner side of the bottom end of the fixed sleeve, and the upper part of the lower cavity column is movably sleeved with the bottom section of the movable column sleeve.

[0007] Furthermore, the bottom of the lower cavity column is fixedly connected to a bottom ring disk, the bottom of the bottom ring disk is provided with evenly distributed rail grooves, the upper ends of the rail grooves are provided with inner holes, the bottom ends of the inner holes are fixedly connected to connecting tubes, the bottom ends of the connecting tubes are fixedly connected to cavity tubes, the inner holes connect the bottom space of the lower cavity column with the cavity tube, the inner wall of the cavity tube is fixedly sleeved with a limiting ring near the outer side of the connecting tube, and the interior of the cavity tube is movably sleeved with a piston column.

[0008] Furthermore, the bottom space of the lower cavity column and the connecting space between the cavity cylinder and the inner hole are filled with hydraulic oil, the outer end of the piston column is fixedly connected to a bottom connecting plate, a return spring is fixedly connected between the outer side of the bottom connecting plate and the inner wall of the rail groove, the inner end of the bottom connecting plate is fixedly connected to a bottom curved block, the adjacent end surfaces of the bottom curved block contact and close to each other when the piston column is located at the innermost side, and the adjacent end surfaces of the bottom curved block are provided with inclined surfaces.

[0009] Furthermore, the bottom end of the bottom ring disk is fixedly connected with a bottom outer sleeve, and the wall surface of the bottom outer sleeve is provided with evenly distributed installation grooves, and the installation grooves are respectively aligned with the closed parts of the adjacent end surfaces of the bottom curved block, and air boxes are fixedly installed on the installation grooves, and evenly distributed air nozzles are fixedly installed on the inner side surface of the air box, and the outer side of the air box is fixedly connected with a fixed pipe, and an air ring is fixedly installed on the outer end of the fixed pipe, and an air pump is fixedly installed on the upper end of the bottom ring disk, and an air pipe is connected between the output end of the air pump and the air ring.

[0010] Technical effects and advantages of the present invention: The present invention is provided with a liquid discharge component. When the petroleum forms a rotating flow at the inner wall of the inner cylinder, the solid particles with higher density are thrown to the wall due to the centrifugal force and move downward, and the liquid with lower density gathers to the central low-pressure area to form an upward internal vortex, and moves upward through the overflow pipe, and is finally discharged outward from the liquid discharge pipe. Some fine particle impurities will also rotate and flow with the liquid at the inner wall of the inner cylinder due to their light weight. Due to their small volume and light weight, it is difficult for them to move downward. They move upward with part of the liquid at the wall of the inner cylinder, and part of the liquid is filtered through the filter ring. The fine particles are intercepted and collected in the sand collecting trough. After the part of the liquid is separated from the fine impurity particles, it is discharged outward from the capillary. In this way, the sand and gravel separation performance of the device can be improved.

[0011] The present invention is provided with a sand discharge component. When solid particles with larger density are thrown toward the wall due to centrifugal force and move downward, these large solid particles will move downward through the second conical cylinder and be discharged at the bottom channel block. When the number of these large solid particles is too large, it is easy to cause blockage at the bottom channel block. When the actual channel diameter of the inner wall of the bottom channel block continues to shrink, as the solid particles above continue to impact and move downward, the pressure of the flow in the pipe will continue to increase. Therefore, when the pressure continues to increase, the solid particles will continuously impact the pressure-bearing ring leaf, causing the pressure-bearing ring leaf together with the movable column sleeve to move downward in the lower cavity column, thereby pushing the piston column to move outward through the hydraulic oil injected into the lower cavity column, and the movable column The outward movement of the plug drives the bottom curved block connected to it to move outward, thereby separating the adjacent end faces of the bottom curved block and using the inclined surface to generate a gap channel. The air pump is started to blow through the air pipe, and high-pressure airflow is injected into the air box and blows inward from the air nozzle. The blowing direction of the air nozzle is aligned with the gap channel, thereby separating the mutually adhered solid particles that are blocked inside the bottom curved block from each other, thereby solving the sand and gravel blockage problem here. The sand and gravel particles are discharged outward from the bottom of the bottom curved block, and some of the sand and gravel particles are discharged from the gap channel and enter the pipeline of the bottom outer sleeve, and will eventually be discharged outward from the bottom of the bottom outer sleeve. The sand and gravel discharge blockage problem of the device is solved in the above manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 It is a schematic diagram of the separation component structure of the present invention.

[0014] Figure 3 It is a schematic diagram of the cross-sectional structure of the liquid discharge component of the present invention.

[0015] Figure 4 It is a schematic structural diagram of the sand discharge assembly of the present invention.

[0016] Figure 5 It is a schematic diagram of the cross-sectional structure of the sand discharge assembly of the present invention.

[0017] Figure 6 For attachment Figure 5 An enlarged schematic diagram of the structure at location A is shown.

[0018] Figure 7 It is a schematic diagram of the structure of the bottom track curved block of the present invention.

[0019] The accompanying drawings are marked as follows: 1. separation assembly; 101. column shell; 102. inner column; 103. conical shell; 104. first conical cylinder; 105. first flange ring; 106. second conical cylinder; 107. second flange ring; 108. bottom plate; 109. upper plate; 110. tangential connection channel; 111. injection channel; 112. fixed plate; 113. intermediate pipe; 114. input pipe; 115. pipeline flange; 2. drainage assembly; 201. pipe sleeve bin; 202. sand collecting trough; 203. cover sleeve bin; 204. filter ring; 205. sealing ring; 206. lower flange; 207. overflow pipe; 208. upper flange; 209. upper pipe; 210. Drain pipe; 211. Capillary; 3. Sand discharge assembly; 301. Bottom connecting ring; 302. Through hole; 303. Upper cavity column; 304. Movable column sleeve; 305. Pressure ring leaf; 306. Fixed outer sleeve; 307. Lower cavity column; 308. Bottom ring plate; 309. Rail groove; 310. Inner hole; 311. Connecting pipe; 312. Cavity cylinder; 313. Limiting ring; 314. Piston column; 315. Bottom connecting plate; 316. Return spring; 317. Bottom curved block; 318. Inclined surface; 319. Bottom outer sleeve; 320. Mounting groove; 321. Air box; 322. Air nozzle; 323. Fixed pipe; 324. Air ring; 325. Air pump; 326. Air pipe. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are only examples. The sand and gravel filtering equipment used in the oil production process involved in the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained without creative work by ordinary technicians in this field belong to the scope of protection of the present invention.

[0021] Reference Figure 1 The present invention provides a sand and gravel filtering device for use in the oil production process, comprising a separation component 1, a liquid discharge component 2 is provided at the upper end of the separation component 1, and a sand discharge component 3 is provided at the bottom end of the separation component 1; In this embodiment, the separation component 1 is used to input the mined oil, the drainage component 2 is used to separate the sand and gravel and discharge the oil after the sand is removed, and the sand discharge component 3 is used to discharge the sand and gravel, and can prevent excessive large particles of sand and gravel from clogging the discharge port. The specific structure and working principle of the above components will be described in detail later.

[0022] Reference Figure 2 and Figure 3The separation assembly 1 includes a column shell 101, an inner column 102 is fixedly sleeved inside the column shell 101, a conical shell 103 is fixedly connected to the bottom end of the column shell 101, a first conical cylinder 104 is fixedly sleeved inside the conical shell 103, a pair of first flange rings 105 are fixedly sleeved between the column shell 101 and the conical shell 103, a second conical cylinder 106 is fixedly connected to the bottom end of the conical shell 103, a pair of second flange rings 107 are fixedly sleeved between the second conical cylinder 106 and the conical shell 103, and a bottom layer 104 is fixedly sleeved on the top end of the column shell 101. Plate 108, an upper plate 109 is fixedly installed on the upper end of the bottom plate 108, a tangential connection channel 110 is opened on the column shell 101 and the inner column 102, and a flow injection channel 111 is fixedly connected to the tangential connection channel 110, and the flow injection channel 111 is connected to the tangential connection channel 110 along the tangential direction of the inner wall of the inner column 102, and a fixed plate 112 is fixedly installed at the end of the flow injection channel 111, and the fixed plate 112 is fixedly connected to an intermediate pipe 113, and the end of the intermediate pipe 113 is fixedly connected to an input pipe 114, and a pair of pipe flanges 115 are fixedly sleeved between the intermediate pipe 113 and the input pipe 114; In this embodiment, the extracted oil is input from the input pipe 114, injected into the interior of the inner cylinder 102 along the tangential direction of the inner wall of the inner cylinder 102 through the injection channel 111 and forms a rotating flow there. During the rotation process, solid particles with higher density are thrown toward the wall due to centrifugal force, and move downward along the conical section, and finally discharged from the bottom flow port. The liquid with lower density gathers in the central low-pressure area, forming an upward internal vortex, which is discharged through the overflow port. The above-mentioned separation and sand removal method will be described in detail later.

[0023] Reference Figure 2 and Figure 3 The drainage assembly 2 includes a tube sleeve bin 201, which is fixedly mounted on the upper end of the upper plate 109. A sand collecting tank 202 is provided inside the tube sleeve bin 201. A cover bin 203 is provided on the upper end of the tube sleeve bin 201. A filter ring 204 is fixedly sleeved between the inner wall of the cover bin 203 and the inner wall of the tube sleeve bin 201. A sealing ring 204 is fixedly sleeved at the outer ends of the tube sleeve bin 201 and the cover bin 203. 05, the inner circle of the cover sleeve 203 is fixedly connected with a lower flange 206, the inner circle of the lower flange 206 is fixedly connected with an overflow pipe 207, the upper end of the lower flange 206 is fixedly connected with an upper flange 208, the inner circle of the upper flange 208 is fixedly connected with an upper connecting pipe 209, the upper end of the upper connecting pipe 209 is fixedly connected with a drain pipe 210, and the outer side of the sealing ring 205 is fixedly connected with a capillary 211; In this embodiment, when the oil forms a rotating flow at the inner wall of the inner cylinder 102, the solid particles with higher density are thrown to the wall due to centrifugal force and move downward, and the liquid with lower density gathers in the central low-pressure area to form an upward internal vortex, and moves upward through the overflow pipe 207, and is finally discharged from the discharge pipe 210. Some fine particle impurities will also rotate with the liquid on the inner wall of the inner cylinder 102 due to their light weight. Due to their small volume and light weight, it is difficult for them to move downward. They move upward with part of the liquid on the wall of the inner cylinder 102, and part of the liquid is filtered from the filter ring 204. The fine particles are intercepted and collected in the sand collecting tank 202. After the part of the liquid is separated from the fine impurity particles, it is discharged from the capillary 211. In this way, the sand and gravel separation performance of the device can be improved.

[0024] Reference Figure 4-Figure 7The sand discharge assembly 3 includes a bottom connecting ring 301, which is fixedly mounted on the bottom end of the second conical cylinder 106. The bottom connecting ring 301 is provided with evenly distributed through holes 302. An upper cavity column 303 is fixedly mounted on the bottom end of the bottom connecting ring 301. The internal space of the upper cavity column 303 is communicated with the outside through the through hole 302. A movable column sleeve 304 is movably sleeved at the bottom of the upper cavity column 303. A pressure-bearing ring leaf 305 is provided on the inner wall of the movable column sleeve 304. A fixed sleeve 306 is fixedly sleeved on the outer side of the bottom end of the upper cavity column 303. A lower cavity column 307 is fixedly sleeved on the inner side of the bottom end of the fixed sleeve 306. The upper part of the lower cavity column 307 is movably sleeved with the bottom section of the movable column sleeve 304, and the bottom of the lower cavity column 307 is fixedly connected with a bottom ring plate 308, and the bottom of the bottom ring plate 308 is provided with evenly distributed track grooves 309, and the upper ends of the track grooves 309 are provided with inner holes 310, and the bottom ends of the inner holes 310 are fixedly connected with connecting pipes 311, and the bottom ends of the connecting pipes 311 are fixedly connected with cavity tubes 312, and the inner holes 310 connect the bottom space of the lower cavity column 307 with the cavity tube 312, and the inner wall of the cavity tube 312 is fixedly sleeved with a limiting ring 313 near the outer side of the connecting pipe 311. The piston column 314 is movably sleeved inside, the bottom space of the lower cavity column 307 and the connecting space between the cavity cylinder 312 and the inner hole 310 are filled with hydraulic oil, the outer end of the piston column 314 is fixedly connected to the bottom connecting plate 315, the outer side of the bottom connecting plate 315 and the inner wall of the track groove 309 are fixedly connected with a return spring 316, the inner end of the bottom connecting plate 315 is fixedly connected to a bottom curved block 317, the adjacent end surfaces of the bottom curved block 317 are in contact and closed with each other when the piston column 314 is located at the innermost side, the adjacent end surfaces of the bottom curved block 317 are provided with inclined surfaces 318, and the bottom end of the bottom ring disk 308 is fixedly connected to the bottom of the bottom ring disk 308. A bottom outer track sleeve 319 is fixedly connected, and evenly distributed installation grooves 320 are opened on the wall surface of the bottom outer track sleeve 319, and the installation grooves 320 are respectively aligned with the closed parts of the adjacent end surfaces of the bottom track curved block 317. An air box 321 is fixedly installed on the installation grooves 320, and evenly distributed air nozzles 322 are fixedly installed on the inner side surface of the air box 321. A fixed pipe 323 is fixedly connected to the outer side of the air box 321, and an air ring 324 is fixedly installed on the outer end of the fixed pipe 323. An air pump 325 is fixedly installed on the upper end of the bottom ring disk 308, and an air pipe 326 is connected between the output end of the air pump 325 and the air ring 324; In this embodiment, when solid particles with larger density are thrown toward the wall due to centrifugal force and move downward, these large solid particles will move downward through the second conical cylinder 106 and be discharged at the bottom channel block 317. When the number of these large solid particles is too large, it is easy to get blocked at the bottom channel block 317. When the actual channel diameter of the inner wall of the bottom channel block 317 continues to shrink, as the solid particles above continue to impact and move downward, the pressure of the flow in the pipe will continue to increase. Therefore, when the pressure continues to increase, the solid particles will continue to impact the pressure-bearing ring leaf 305, causing the pressure-bearing ring leaf 305 and the movable column sleeve 304 to move downward in the lower chamber column 307, thereby pushing the piston column 314 outward through the hydraulic oil injected into the lower chamber column 307, and the piston column 314 moves toward The external movement drives the bottom curved block 317 connected to it to move outward, thereby separating the adjacent end faces of the bottom curved block 317, and using the inclined surface 318 to generate a gap channel, the air pump 325 is started to blow through the air pipe 326, and the high-pressure airflow is injected into the air box 321 and blown inward from the air nozzle 322. The blowing direction of the air nozzle 322 is aligned with the gap channel, so that the mutually adhered solid particles blocked inside the bottom curved block 317 are separated from each other, thereby solving the sand and gravel blockage problem here, and the sand and gravel particles are discharged outward from the bottom of the bottom curved block 317, and some of the sand and gravel particles are discharged from the gap channel and enter the pipeline of the bottom outer sleeve 319, and will eventually be discharged outward at the bottom of the bottom outer sleeve 319, and the sand and gravel discharge blockage problem of the device is solved in the above manner.

[0025] The working principle of the present invention is as follows: when the oil forms a rotating flow at the inner wall of the inner cylinder 102, the solid particles with a larger density are thrown to the wall due to the centrifugal force and move downward, and the liquid with a smaller density gathers in the central low-pressure area to form an upward internal vortex, and moves upward through the overflow pipe 207, and is finally discharged from the discharge pipe 210. Some fine particle impurities, due to their light weight, will also rotate and flow with the liquid at the inner wall of the inner cylinder 102. Due to their small volume and light weight, it is difficult for them to move downward. They move upward with part of the liquid at the wall of the inner cylinder 102, and part of the liquid is discharged from the filter ring 210. 04, the fine particles are intercepted and collected in the sand collecting tank 202. After the liquid is separated from the fine impurity particles, it is discharged from the capillary 211. In this way, the performance of the sand and gravel separation of the device can be improved. When the solid particles with higher density are thrown to the wall due to centrifugal force and move downward, these large solid particles will move downward through the second conical cylinder 106 and be discharged at the bottom channel block 317. When the number of these large solid particles is too large, it is easy to get blocked at the bottom channel block 317. When the actual channel diameter of the inner wall of the bottom channel block 317 continues to shrink, As the solid particles above continue to impact and move downward, the pressure of the flow in the pipe will continue to increase. Therefore, when the pressure continues to increase, the solid particles will continuously impact the pressure-bearing ring leaf 305, causing the pressure-bearing ring leaf 305 and the movable column sleeve 304 to move downward in the lower cavity column 307, thereby pushing the piston column 314 outward through the hydraulic oil injected into the lower cavity column 307. The outward movement of the piston column 314 drives the bottom curved block 317 connected to it to move outward, thereby separating the adjacent end faces of the bottom curved block 317, and using the inclined surface 318 to generate a gap channel, and the air pump 325 is started. Blowing is performed through the air pipe 326, and high-pressure air flow is injected into the air box 321 and blown inward from the air nozzle 322. The blowing direction of the air nozzle 322 is aligned with the gap channel, so that the mutually adhering solid particles that are blocked inside the bottom road block 317 are separated from each other, thereby solving the sand and gravel blockage problem here, and the sand and gravel particles are discharged outward from the bottom of the bottom road block 317, and some sand and gravel particles are discharged from the gap channel and enter the pipeline of the bottom outer road sleeve 319, and will eventually be discharged outward from the bottom of the bottom outer road sleeve 319. The above method solves the sand and gravel discharge blockage problem of the device.

[0026] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sand and gravel filtering device used in the process of oil production, characterized in that: It comprises a separation component (1), wherein the upper end of the separation component (1) is provided with a liquid discharge component (2), and the bottom end of the separation component (1) is provided with a sand discharge component (3); The drainage assembly (2) comprises a tube sleeve bin (201), a sand collecting trough (202) is provided inside the tube sleeve bin (201), a cover sleeve bin (203) is provided at the upper end of the tube sleeve bin (201), a filter ring (204) is fixedly sleeved between the inner wall of the cover sleeve bin (203) and the inner wall of the tube sleeve bin (201), a sealing ring (205) is fixedly sleeved at the outer ends of the tube sleeve bin (201) and the cover sleeve bin (203), and the cover sleeve bin (203) is fixedly sleeved to the outer ends of the tube sleeve bin (201) and the cover sleeve bin (203). ) is fixedly sleeved with a lower connecting flange (206) at its inner ring, an overflow pipe (207) is fixedly sleeved with the inner ring of the lower connecting flange (206), an upper connecting flange (208) is fixedly connected to the upper end of the lower connecting flange (206), an upper connecting pipe (209) is fixedly sleeved with the inner ring of the upper connecting flange (208), a drain pipe (210) is fixedly connected to the upper end of the upper connecting pipe (209), and a capillary tube (211) is fixedly connected to the outer side of the sealing ring (205); The sand removal assembly (3) comprises a bottom connecting ring (301), the bottom connecting ring (301) is provided with evenly distributed through holes (302), an upper cavity column (303) is fixedly mounted on the bottom end of the bottom connecting ring (301), the internal space of the upper cavity column (303) is connected to the outside through the through hole (302), a movable column sleeve (304) is movably sleeved at the bottom of the upper cavity column (303), a pressure-bearing ring leaf (305) is provided on the inner wall of the movable column sleeve (304), and a bottom end of the upper cavity column (303) is fixedly mounted on the outer side thereof. A fixed sleeve (306) is fixedly sleeved, a lower cavity column (307) is fixedly sleeved on the inner side of the bottom end of the fixed sleeve (306), the upper part of the lower cavity column (307) is movably sleeved with the bottom section of the movable column sleeve (304), the bottom of the lower cavity column (307) is fixedly connected with a bottom ring plate (308), the bottom of the bottom ring plate (308) is provided with evenly distributed rail grooves (309), the upper ends of the rail grooves (309) are provided with inner holes (310), and the bottom ends of the inner holes (310) are fixedly connected with connecting pipes. (311), the bottom end of the connecting tube (311) is fixedly connected to a cavity tube (312), the inner hole (310) connects the bottom space of the lower cavity column (307) and the cavity tube (312) to each other, the inner wall of the cavity tube (312) is fixedly sleeved with a limit ring (313) near the outer side of the connecting tube (311), the interior of the cavity tube (312) is movably sleeved with a piston column (314), the bottom space of the lower cavity column (307) and the space in the cavity tube (312) that is connected to the inner hole (310) are connected to each other. The space is filled with hydraulic oil, the outer ends of the piston rods (314) are fixedly connected to bottom connecting plates (315), a return spring (316) is fixedly connected between the outer side of the bottom connecting plate (315) and the inner wall surface of the track groove (309), the inner ends of the bottom connecting plates (315) are fixedly connected to bottom curved blocks (317), the adjacent end surfaces of the bottom curved blocks (317) contact and close with each other when the piston rods (314) are located at the innermost side, and the adjacent end surfaces of the bottom curved blocks (317) are provided with inclined surfaces (318).

2. The sand and gravel filtering equipment used in the oil production process according to claim 1 is characterized in that: The separation assembly (1) comprises a column shell (101), an inner column (102) is fixedly sleeved inside the column shell (101), a conical shell (103) is fixedly connected to the bottom end of the column shell (101), a first conical shell (104) is fixedly sleeved inside the conical shell (103), a pair of first flange rings (105) are fixedly sleeved between the column shell (101) and the conical shell (103), a second conical shell (106) is fixedly connected to the bottom end of the conical shell (103), a pair of second flange rings (107) are fixedly sleeved between the second conical shell (106) and the conical shell (103), and a bottom plate (104) is fixedly connected to the top end of the column shell (101). 8), an upper plate (109) is fixedly mounted on the upper end of the bottom plate (108), a tangential connection channel (110) is provided on the column shell (101) and the inner column (102), an injection channel (111) is fixedly connected to the tangential connection channel (110), the injection channel (111) is connected to the tangential connection channel (110) along the tangential direction of the inner wall of the inner column (102), a fixing plate (112) is fixedly mounted on the end of the injection channel (111), the fixing plate (112) is fixedly connected to an intermediate pipe (113), the end of the intermediate pipe (113) is fixedly connected to an input pipe (114), and a pair of pipe flanges (115) are fixedly sleeved between the intermediate pipe (113) and the input pipe (114).

3. The sand and gravel filtering equipment used in the oil production process according to claim 1 is characterized in that: The tube sleeve bin (201) is fixedly mounted on the upper end of the upper plate (109), and the bottom connecting ring (301) is fixedly mounted on the bottom end of the second conical cylinder (106).

4. The sand and gravel filtering equipment used in the oil production process according to claim 1 is characterized in that: The bottom end of the bottom ring disk (308) is fixedly connected to a bottom outer track sleeve (319), and the wall surface of the bottom outer track sleeve (319) is provided with evenly distributed mounting grooves (320), and the mounting grooves (320) are respectively aligned with the closed positions of the adjacent end surfaces of the bottom track curved block (317), and the mounting grooves (320) are fixedly installed with air boxes (321), and the inner side surface of the air boxes (321) is fixedly installed with evenly distributed air nozzles (322), and the outer side of the air boxes (321) is fixedly connected to a fixed pipe (323), and the outer end of the fixed pipe (323) is fixedly installed with an air ring (324), and the upper end of the bottom ring disk (308) is fixedly installed with an air pump (325), and an air pipe (326) is connected between the output end of the air pump (325) and the air ring (324).

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