A sand and gravel filtration device for oil extraction

Abstract

This utility model discloses an oil extraction sand and gravel filtration device, comprising: a filter cylinder with a cylinder cover fixedly connected to its left side, an oil passage pipe embedded and fixedly installed on the left side of the cylinder cover, a conical structure on the bottom inner wall of the filter cylinder, and a discharge valve fixedly connected to the bottom of the filter cylinder for discharging the filtered oil from the filter cylinder; a multi-stage filtration mechanism rotatably installed inside the filter cylinder for three-stage centrifugal filtration of the oil; and a sealing block in sealing contact with the right side of the multi-stage filtration mechanism. This utility model, through a series of structural designs, enables three-stage centrifugal filtration of oil via centrifugal rotation. Compared to the single-stage filtration method in the prior art, its filtration effect is significantly improved. Furthermore, it allows for direct ejection and cleaning of sand and gravel via electric drive, significantly improving cleaning efficiency compared to the prior art method that requires removing the filter cylinder for cleaning, and facilitating personnel operation.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, and in particular to an oil extraction sand and gravel filtration device. Background Technology

[0002] In the process of oil extraction, oil and gas flow from the reservoir to the bottom of the well and then rise from the bottom to the wellhead. Immediately after extraction, the oil contains sand and gravel, carrying a large amount of these particles. During later processing, this sand-laden oil impacts friction equipment, reducing its lifespan over time. The sand and gravel can also clog the equipment, causing sudden interruptions in oil extraction and affecting efficiency. Therefore, a filtration device is needed to remove the sand and gravel from the oil. A search revealed an existing patent (publication number: CN214830128U) that discloses an oil extraction sand and gravel filtration device, comprising: a housing; two drain pipes, with the two drain pipes fixedly installed on the left and right sides of the bottom of the housing, respectively. The inner cavity of the oil drain pipe is connected to the inner cavity of the housing; a concave plate is fixedly installed at the center of the bottom end of the housing; a motor is fixedly installed at the bottom end of the inner cavity of the concave plate; a rotating rod is locked and fixed to the output end of the motor by a coupling, and the top end of the rotating rod extends into the inner cavity of the housing, and the rotating rod and the housing are installed together by a sealed bearing; a rectangular block is fixedly installed at the top end of the rotating rod; a sleeve block is fitted onto the outer wall of the rectangular block; this oil extraction sand and gravel filtration device can accelerate the filtration speed of oil by centrifugation, and can easily remove the filtered sand and gravel for cleaning, meeting the work needs of workers and facilitating its widespread promotion;

[0003] The oil extraction sand and gravel filtration device disclosed in the above patent can quickly filter oil by driving the filter cartridge to rotate centrifugally. However, it uses a single filter screen for filtration, resulting in low filtration efficiency. Furthermore, it is inconvenient for personnel to quickly clean out the filtered sand and gravel after filtration. The above patent requires the filter cartridge to be removed for cleaning, which is quite inconvenient. In view of the above, this application proposes an oil extraction sand and gravel filtration device. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a sand and gravel filtration device for oil extraction.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An oil extraction sand and gravel filtration device, comprising:

[0007] The filter cartridge has a cover fixedly connected to its left side, and an oil passage pipe is embedded and fixedly installed on the left side of the cover. The bottom inner wall of the filter cartridge is designed with a conical structure, and a discharge valve is fixedly connected to the bottom of the filter cartridge. The discharge valve is used to discharge the oil in the filter cartridge after filtration.

[0008] The multi-stage filtration mechanism is rotatably installed inside the filter cartridge and is used for three-stage centrifugal filtration of petroleum.

[0009] The sealing block makes a sealing contact with the right side of the multi-stage filtration mechanism. The sealing block is used to seal the right side of the multi-stage filtration mechanism.

[0010] A transverse drive mechanism is installed on the filter cartridge and is sealed and rotated on the sealing block. The transverse drive mechanism is used to drive the sealing block to move to the right.

[0011] A rotary drive mechanism is installed on the right side of the sealing block and the lateral drive mechanism. The rotary drive mechanism is used to drive the sealing block to rotate.

[0012] The slag pushing mechanism, installed on the multi-stage filtration mechanism and the sealing block, is used to push the filtered sand and gravel out.

[0013] Preferably, the multi-stage filtration mechanism includes a first filter cylinder rotatably installed inside a filter cylinder. The first filter cylinder is rotatably sleeved on an oil passage pipe. The right side of the first filter cylinder is open, and the left side is a sealing structure. A second filter cylinder and a third filter cylinder are fixedly connected to the inner wall of the left side of the first filter cylinder. The third filter cylinder is located inside the second filter cylinder. The right sides of the first, second, and third filter cylinders are all in close contact with the left side of the sealing block. The first, second, and third filter cylinders are used to filter sand and gravel in the oil.

[0014] Preferably, the lateral drive mechanism includes a sealing plate, the left side of which is in sealing contact with the right side of the filter cylinder, the sealing plate being rotatably sleeved on the sealing block, connecting blocks being fixedly connected to the top and bottom of the sealing plate, multi-stage electric telescopic rods being fixedly connected to the top and bottom of the filter cylinder, the right end of the output shaft of the multi-stage electric telescopic rods being fixedly connected to the left side of the connecting block, L-shaped locking rods being fixedly connected to the top and bottom of the sealing block, and sleeves being fixedly connected to the top right and bottom right of the first filter cylinder, the sleeves being movably sleeved on the corresponding L-shaped locking rods, the sleeves and L-shaped locking rods cooperating to achieve a locking connection between the sealing block and the first filter cylinder.

[0015] Preferably, the rotary drive mechanism includes a first gear, which is fixedly installed on the right side of the sealing block. A second gear meshes with the bottom of the first gear. A drive motor is fixedly installed on the right side of the sealing plate. The right end of the output shaft of the drive motor is fixedly connected to the left side of the second gear. The first gear, the second gear, and the drive motor cooperate to drive the sealing block to rotate.

[0016] Preferably, the slag pushing mechanism includes a counterweight pushing block. The bottom of the counterweight pushing block is in movable contact with the bottom inner wall of the third filter cylinder, and the top of the counterweight pushing block is not in contact with the top inner wall of the third filter cylinder. A first annular slag pushing plate is movably sleeved on the third filter cylinder, and its outer side is in movable contact with the inner wall of the second filter cylinder. A second annular slag pushing plate is movably sleeved on the second filter cylinder, and its outer side is in movable contact with the inner wall of the first filter cylinder. Five connecting rods are fixedly connected to the left side of the sealing block. Except for the connecting rod in the middle, the left ends of the other four connecting rods are fixedly connected in pairs to the right sides of the first annular slag pushing plate and the second annular slag pushing plate. The left end of the middle connecting rod is rotatably installed on the top right side of the counterweight pushing block. The first annular slag pushing plate, the second annular slag pushing plate and the counterweight pushing block cooperate to push the sand and gravel inside the first filter cylinder, the second filter cylinder and the third filter cylinder to the right.

[0017] Preferably, a synchronous control switch is fixedly connected to the bottom of the multi-stage electric telescopic rod below. The synchronous control switch is electrically connected to the two multi-stage electric telescopic rods and can control the two multi-stage electric telescopic rods to open synchronously. A sealing ring is glued and fixed to the left side of the sealing plate. The left side of the sealing ring is in close contact with the right side of the filter cylinder. A sealing rubber is glued and fixed to the left side of the sealing block. The left side of the sealing rubber is in close contact with the right side of the first filter cylinder, the second filter cylinder, and the third filter cylinder. The sealing rubber achieves the sealing between the sealing block and the first filter cylinder, the second filter cylinder, and the third filter cylinder. A first bearing hole is opened on the right side of the sealing plate. A first sealing bearing is fixedly fitted in the first bearing hole. The inner side of the inner ring of the first sealing bearing is fixedly connected to the outer side of the sealing block. The first sealing bearing serves to allow the sealing block to rotate and be installed.

[0018] Preferably, a second bearing hole is provided on the left side of the first filter cylinder, and a first bearing is fixedly sleeved in the second bearing hole. The inner side of the inner ring of the first bearing is fixedly connected to the outer side of the oil passage pipe. The first bearing serves to rotate between the oil passage pipe and the first filter cylinder. The filter holes on the first, second, and third filter cylinders increase in size from the outside to the inside.

[0019] Compared with existing technologies, the beneficial effects of this utility model are:

[0020] 1. By combining a rotary drive mechanism with a multi-stage filtration mechanism, the first, second, and third filter cylinders can be driven to rotate in a centrifugal manner to perform three-stage centrifugal filtration of oil. Compared with the single-stage filtration method in the existing technology, its filtration effect is significantly improved.

[0021] 2. By combining the slag pushing mechanism and the transverse drive mechanism, the first annular slag pushing plate, the second annular slag pushing plate and the counterweight pushing block can be driven to move to the right during cleaning, so that the sand and gravel can be directly pushed out of the first filter screen cylinder, the second filter screen cylinder and the third filter screen cylinder for cleaning. Compared with the existing technology that requires the filter screen cylinder to be removed for cleaning, its cleaning efficiency is significantly improved.

[0022] This invention, through a series of structural designs, enables three-stage centrifugal filtration of oil via centrifugal rotation. Compared to the single-stage filtration method in the prior art, its filtration effect is significantly improved. Furthermore, it can directly push out and clean sand and gravel through electric drive. Compared to the prior art method that requires removing the filter screen for cleaning, its cleaning efficiency is significantly improved, and it is more convenient for personnel to operate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a sand and gravel filtration device for oil extraction proposed in this utility model.

[0024] Figure 2 This is a schematic diagram of the main cross-sectional structure of an oil extraction sand and gravel filtration device proposed in this utility model;

[0025] Figure 3 for Figure 2 A magnified structural diagram of part A in the middle.

[0026] In the diagram: 1. Filter cylinder; 101. Cylinder cover; 102. Oil passage pipe; 2. Multi-stage filtration mechanism; 201. First filter cylinder; 202. Second filter cylinder; 203. Third filter cylinder; 3. Blocking block; 4. Rotary drive mechanism; 401. First gear; 402. Second gear; 403. Drive motor; 5. Lateral drive mechanism; 501. Blocking plate; 502. Multi-stage electric telescopic rod; 503. Connecting block; 504. Sleeve; 505. L-shaped clamping rod; 601. Second annular slag pusher plate; 602. First annular slag pusher plate; 603. Counterweight pusher block; 604. Connecting rod. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Reference Figure 1-3 An oil extraction sand and gravel filtration device, comprising:

[0029] The filter cartridge 1 has a cover 101 fixedly connected to its left side. An oil passage pipe 102 is embedded and fixedly installed on the left side of the cover 101. The bottom inner wall of the filter cartridge 1 is designed with a conical structure. A discharge valve is fixedly connected to the bottom of the filter cartridge 1. The discharge valve is used to discharge the oil in the filter cartridge 1 after filtration. Two support legs are fixedly connected to both sides of the bottom of the filter cartridge 1. The four support legs are used to support the filter cartridge 1.

[0030] The multi-stage filtration mechanism 2 is rotatably installed inside the filter cartridge 1;

[0031] The sealing block 3 makes sealing contact with the right side of the multi-stage filtration mechanism 2;

[0032] The multi-stage filtration mechanism 2 includes a first filter cylinder 201 rotatably mounted inside a filter cylinder 1. A second sealed bearing is fixedly installed inside the filter cylinder 1, and the inner side of the inner ring of the second sealed bearing is fixedly connected to the outer side of the first filter cylinder 201. The second sealed bearing allows the first filter cylinder 201 to be rotatably mounted. The first filter cylinder 201 is rotatably sleeved on an oil passage pipe 102. The right side of the first filter cylinder 201 is open, and the left side is sealed. A second bearing hole is opened on the left side of the first filter cylinder 201, and a first bearing is fixedly sleeved in the second bearing hole. The inner side of the inner ring of the first bearing is fixedly connected to the outer side of the oil passage pipe 102. The first bearing allows for rotatable mounting between the oil passage pipe 102 and the first filter cylinder 201. A second filter is fixedly connected to the inner wall of the left side of the first filter cylinder 201. The first filter cylinder 201 and the second filter cylinder 202 are located inside the third filter cylinder 202. The right sides of the first filter cylinder 201, the second filter cylinder 202, and the third filter cylinder 203 are in close contact with the left side of the sealing block 3. A sealing rubber is bonded and fixed to the left side of the sealing block 3. The left side of the sealing rubber is in close contact with the right side of the first filter cylinder 201, the second filter cylinder 202, and the third filter cylinder 203. The sealing rubber achieves a seal between the sealing block 3 and the first filter cylinder 201, the second filter cylinder 202, and the third filter cylinder 203. The first filter cylinder 201, the second filter cylinder 202, and the third filter cylinder 203 are used to filter sand and gravel in oil. The filter holes on the first filter cylinder 201, the second filter cylinder 202, and the third filter cylinder 203 increase in size from the outside to the inside.

[0033] The transverse drive mechanism 5 is installed on the filter cylinder 1 and is sealed and rotated on the sealing block 3;

[0034] The transverse drive mechanism 5 includes a sealing plate 501. The left side of the sealing plate 501 is in sealing contact with the right side of the filter cylinder 1. The sealing plate 501 is rotatably fitted onto the sealing block 3. A sealing ring is bonded and fixed to the left side of the sealing plate 501, and the left side of the sealing ring is in tight contact with the right side of the filter cylinder 1. A first bearing hole is provided on the right side of the sealing plate 501, and a first sealing bearing is fixedly fitted inside the first bearing hole. The inner side of the inner ring of the first sealing bearing is fixedly connected to the outer side of the sealing block 3. The first sealing bearing serves to allow the sealing block 3 to rotate. Connecting blocks 503 are fixedly connected to the top and bottom of the sealing plate 501. Multi-stage electric telescopic rods 5 are fixedly connected to the top and bottom of the filter cylinder 1. 02. The right end of the output shaft of the multi-stage electric telescopic rod 502 is fixedly connected to the left side of the connecting block 503. The top and bottom of the sealing round block 3 are fixedly connected with L-shaped clamps 505. The top right side and bottom right side of the first filter cylinder 201 are fixedly connected with sleeves 504. The sleeves 504 are movably fitted on the corresponding L-shaped clamps 505. The sleeves 504 and L-shaped clamps 505 cooperate to realize the snap-fit ​​connection between the sealing round block 3 and the first filter cylinder 201. The bottom of the multi-stage electric telescopic rod 502 is fixedly connected with a synchronous control switch. The synchronous control switch is electrically connected to the two multi-stage electric telescopic rods 502. The synchronous control switch can control the two multi-stage electric telescopic rods 502 to open synchronously.

[0035] The rotary drive mechanism 4 is installed on the right side of the blocking block 3 and the transverse drive mechanism 5;

[0036] The rotary drive mechanism 4 includes a first gear 401, which is fixedly installed on the right side of the sealing block 3. The bottom of the first gear 401 meshes with a second gear 402. A drive motor 403 is fixedly installed on the right side of the sealing plate 501. An L-shaped support is fixedly installed on the bottom right side of the sealing plate 501. The top of the L-shaped support is fixedly connected to the bottom of the drive motor 403. The L-shaped support is used to support the drive motor 403. The right end of the output shaft of the drive motor 403 is fixedly connected to the left side of the second gear 402. The first gear 401, the second gear 402 and the drive motor 403 cooperate to drive the sealing block 3 to rotate.

[0037] In this implementation scheme: the oil passage pipe 102 is connected to the external oil production pipe. The extracted oil enters the third filter cylinder 203 through the oil passage pipe 102. At the same time, the drive motor 403 is turned on, and its output shaft drives the second gear 402 to rotate. The second gear 402 drives the sealing block 3 to rotate through the first gear 401 meshing with it. The sealing block 3 drives the first filter cylinder 201 to rotate centrifugally through two L-shaped clamps 505 and two clamps 504. The first filter cylinder 201 drives the second filter cylinder 202 and the third filter cylinder 203 to rotate centrifugally. Under the centrifugal force, the oil inside the third filter cylinder 203 passes through the second filter cylinder 202 and the first filter cylinder 201 in sequence and enters the filter cylinder 1. The oil inside the filter cylinder 1 can be discharged through the discharge valve. The oil can be filtered in three stages as it passes through the third filter cylinder 203, the second filter cylinder 202 and the first filter cylinder 201 in sequence.

[0038] It should be noted that the third filter cylinder 203, the second filter cylinder 202, and the first filter cylinder 201 are all made of stainless steel.

[0039] A battery is fixedly connected to the rear side of the filter cartridge 1. The battery is electrically connected to the drive motor 403 and the two multi-stage electric telescopic rods 502 through power supply wires. The battery supplies power to the drive motor 403 and the two multi-stage electric telescopic rods 502, and can also connect the drive motor 403 and the two multi-stage electric telescopic rods 502 to an external power supply for power supply.

[0040] In addition, the synchronous control switch can preferably be a Delta ASDA-B3 synchronous controller, and the multi-stage electric telescopic pole 502 can preferably be a Linak LA36 or Thomson Electrak HD electric telescopic pole. The principle of the synchronous control switch controlling the opening of the multi-stage electric telescopic pole 502 is that the synchronous control switch connects the two multi-stage electric telescopic poles 502 in parallel to the same control circuit to ensure simultaneous power on / off and achieve basic synchronization. The specific control principle is a mature technology in this field and will not be elaborated here.

[0041] Furthermore:

[0042] Reference Figure 2-3 An oil extraction sand and gravel filtration device also includes a slag pushing mechanism, which is installed on the multi-stage filtration mechanism 2 and the sealing round block 3;

[0043] The slag pushing mechanism includes a counterweight pushing block 603. The bottom of the counterweight pushing block 603 is in movable contact with the inner wall of the bottom of the third filter cylinder 203, while the top of the counterweight pushing block 603 is not in contact with the inner wall of the top of the third filter cylinder 203. Oil can enter the third filter cylinder 203 through the distance between the top of the counterweight pushing block 603 and the inner wall of the top of the third filter cylinder 203. Under its own weight, the counterweight pushing block 603 is always in contact with the inner wall of the third filter cylinder 203 at the bottom, and the filtered sand and gravel are always located on the inner wall of the bottom of the third filter cylinder 203 under gravity, thus facilitating the pushing of the sand and gravel by the counterweight pushing block 603. A first annular slag pushing plate 602 is movably sleeved on the third filter cylinder 203, with its outer side in movable contact with the inner wall of the second filter cylinder 202. A second filter cylinder 202 is movably sleeved on its outer side, with its outer side in movable contact with the inner wall of the first filter cylinder 201. The second annular slag pusher plate 601 has five connecting rods 604 fixedly connected to the left side of the sealing block 3. Except for the connecting rod 604 in the middle, the left ends of the other four connecting rods 604 are fixedly connected to the right side of the first annular slag pusher plate 602 and the second annular slag pusher plate 601 in pairs. The left end of the middle connecting rod 604 is rotatably installed with the top right side of the counterweight pusher block 603. The top right side of the counterweight pusher block 603 is fixedly connected with a second bearing. The inner side of the inner ring of the second bearing is fixedly connected to the outer side of the middle connecting rod 604. The second bearing serves to allow the middle connecting rod 604 and the counterweight pusher block 603 to rotate and install. The first annular slag pusher plate 602, the second annular slag pusher plate 601 and the counterweight pusher block 603 cooperate to push the sand and gravel inside the first filter cylinder 201, the second filter cylinder 202 and the third filter cylinder 203 to the right.

[0044] In this implementation plan: when it is necessary to clean out the filtered sand and gravel, the two multi-stage electric telescopic rods 502 are opened synchronously in the forward direction by a synchronous control switch. The output shafts of the two multi-stage electric telescopic rods 502 drive the sealing plate 501 to move to the right through the two connecting blocks 503. The sealing plate 501 drives the first annular slag pusher 602, the second annular slag pusher 601 and the counterweight pusher block 603 to move to the right through the sealing round block 3 and the five connecting rods 604, pushing the sand and gravel inside the first filter cylinder 201, the second filter cylinder 202 and the third filter cylinder 203 to the right. The pushed-out sand and gravel fall into the collection box under the action of gravity, thereby completing the sand and gravel cleaning operation.

[0045] It should be noted that the first annular slag pusher plate 602, the second annular slag pusher plate 601, the counterweight pusher block 603, and the connecting rod 604 are all made of stainless steel.

[0046] Working principle: In use, the oil passage pipe 102 is connected to the external oil production pipe. The extracted oil enters the third filter cylinder 203 through the gap between the oil passage pipe 102, the counterweight pusher block 603, and the third filter cylinder 203. At the same time, the drive motor 403 is turned on. The output shaft of the drive motor 403 drives the second gear 402 to rotate. The second gear 402 drives the first gear 401 meshing with it to rotate. The first gear 401 drives the sealing block 3 to rotate. The sealing block 3 drives the first filter cylinder 201 to rotate through two L-shaped clamps 505 and two clamps 504. The first filter cylinder 201 drives the second filter cylinder 203 to rotate. When the third filter cylinder 202 and the third filter cylinder 203 rotate, the oil is centrifugally swung by the rotational force, causing the oil inside the third filter cylinder 203 to pass through the second filter cylinder 202 and the first filter cylinder 201 in sequence and enter the filter cylinder 1. The oil inside the filter cylinder 1 can be discharged through the discharge valve. When the oil passes through the third filter cylinder 203, the second filter cylinder 202 and the first filter cylinder 201 in sequence, it can be filtered in three stages. The filtered sand and gravel are blocked in the third filter cylinder 203, the second filter cylinder 202 and the first filter cylinder 201. By filtering the oil in three stages, the filtration effect is significantly improved compared with the single-stage filtration method in the existing technology.

[0047] After filtration, when the filtered sand and gravel need to be cleaned out, a collection box is placed at the bottom right side of the filter cylinder 1. Two multi-stage electric telescopic rods 502 are opened synchronously in the forward direction via a synchronous control switch. The output shafts of the two multi-stage electric telescopic rods 502 drive the sealing plate 501 to move to the right through two connecting blocks 503. The sealing plate 501 drives the sealing block 3 to move to the right. The sealing block 3 drives two L-shaped clamps 505 to separate from their corresponding clamps 504. The sealing block 3, through five connecting rods 604, drives the first annular pusher plate 602, the second annular pusher plate 601, and the counterweight pusher block 603 to move to the right. Simultaneously, the first annular pusher plate 602, the second annular pusher plate 601, and the counterweight pusher block 603 push the sand and gravel inside the first filter cylinder 201, the second filter cylinder 202, and the third filter cylinder 203 to the right. Under the influence of gravity, the stones fall into the collection box. After the residue is removed, the two multi-stage electric telescopic rods 502 are opened in opposite directions simultaneously by the synchronous control switch. This causes the sealing plate 501 to move the sealing block 3 to the left. The sealing block 3 then moves the two L-shaped clamps 505 into the corresponding clamps 504. The sealing block 3 blocks the right side of the first filter cylinder 201, the second filter cylinder 202, and the third filter cylinder 203. The sealing plate 501 blocks the right side of the filter cylinder 1. At the same time, the sealing block 3 drives the first annular slag pusher plate 602, the second annular slag pusher plate 601, and the counterweight pusher block 603 to move back to the left and reset through the five connecting rods 604, ready for the next cleaning operation. The method of directly pushing out the sand and gravel for cleaning by electric drive is significantly more efficient than the existing method of removing the filter cylinder for cleaning, and it is also more convenient for personnel to operate.

[0048] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sand and gravel filtration device for oil extraction, comprising a filter cylinder (1), characterized in that, include: The filter cylinder (1) has a cylinder cover (101) fixedly connected to its left side. An oil passage pipe (102) is embedded and fixed on the left side of the cylinder cover (101). The bottom inner wall of the filter cylinder (1) is set as a conical structure. A discharge valve is connected and fixed at the bottom of the filter cylinder (1). A multi-stage filtration mechanism (2) is rotatably installed inside the filter cylinder (1); The sealing block (3) makes sealing contact with the right side of the multi-stage filtration mechanism (2); A transverse drive mechanism (5) is installed on the filter cylinder (1) and is sealed and rotated on the sealing block (3); A rotary drive mechanism (4) is installed on the right side of the blocking block (3) and the transverse drive mechanism (5); The slag pushing mechanism is installed on the multi-stage filtration mechanism (2) and the sealing block (3).

2. The oil extraction sand and gravel filtration device according to claim 1, characterized in that, The multi-stage filtration mechanism (2) includes a first filter cylinder (201) rotatably installed inside the filter cylinder (1). The first filter cylinder (201) is rotatably sleeved on the oil passage pipe (102). The right side of the first filter cylinder (201) is open, and the left side is a sealing structure. The left inner wall of the first filter cylinder (201) is fixedly connected to the second filter cylinder (202) and the third filter cylinder (203). The third filter cylinder (203) is located inside the second filter cylinder (202). The right sides of the first filter cylinder (201), the second filter cylinder (202) and the third filter cylinder (203) are all in close contact with the left side of the sealing block (3).

3. The oil extraction sand and gravel filtration device according to claim 2, characterized in that, The transverse drive mechanism (5) includes a sealing plate (501), the left side of the sealing plate (501) is in sealed contact with the right side of the filter cylinder (1), the sealing plate (501) is rotatably sleeved on the sealing block (3), the top and bottom of the sealing plate (501) are fixedly connected with connecting blocks (503), the top and bottom of the filter cylinder (1) are fixedly connected with multi-stage electric telescopic rods (502), the right end of the output shaft of the multi-stage electric telescopic rods (502) is fixedly connected to the left side of the connecting block (503), the top and bottom of the sealing block (3) are fixedly connected with L-shaped clamps (505), the top right side and bottom right side of the first filter cylinder (201) are fixedly connected with clamps (504), and the clamps (504) are movably sleeved on the corresponding L-shaped clamps (505).

4. The oil extraction sand and gravel filtration device according to claim 3, characterized in that, The rotary drive mechanism (4) includes a first gear (401), which is fixedly installed on the right side of the sealing block (3). A second gear (402) meshes with the bottom of the first gear (401). A drive motor (403) is fixedly installed on the right side of the sealing plate (501). The right end of the output shaft of the drive motor (403) is fixedly connected to the left side of the second gear (402).

5. The oil extraction sand and gravel filtration device according to claim 2, characterized in that, The slag pushing mechanism includes a counterweight pushing block (603). The bottom of the counterweight pushing block (603) is in movable contact with the bottom inner wall of the third filter cylinder (203), and the top of the counterweight pushing block (603) is not in contact with the top inner wall of the third filter cylinder (203). A first annular slag pushing plate (602) is movably sleeved on the third filter cylinder (203) and its outer side is in movable contact with the inner wall of the second filter cylinder (202). A second annular slag pushing plate (602) is movably sleeved on the second filter cylinder (202) and its outer side is in movable contact with the inner wall of the second filter cylinder (202). The second annular slag pusher plate (601) in contact with the inner wall of the filter screen cylinder (201) has five connecting rods (604) fixedly connected to the left side of the sealing block (3). Except for the connecting rod (604) located in the middle, the left ends of the other four connecting rods (604) are fixedly connected to the right side of the first annular slag pusher plate (602) and the second annular slag pusher plate (601) respectively. The left end of the middle connecting rod (604) is rotatably installed on the top right side of the counterweight pusher block (603).

6. The oil extraction sand and gravel filtration device according to claim 3, characterized in that, The bottom of the multi-stage electric telescopic rod (502) is fixedly connected to a synchronous control switch. The synchronous control switch is electrically connected to the two multi-stage electric telescopic rods (502). A sealing ring is glued and fixed on the left side of the sealing plate (501). The left side of the sealing ring is in close contact with the right side of the filter cylinder (1). A sealing rubber is glued and fixed on the left side of the sealing block (3). The left side of the sealing rubber is in close contact with the right side of the first filter cylinder (201), the second filter cylinder (202), and the third filter cylinder (203). A first bearing hole is opened on the right side of the sealing plate (501). A first sealing bearing is fixedly fitted in the first bearing hole. The inner side of the inner ring of the first sealing bearing is fixedly connected to the outer side of the sealing block (3).

7. The oil extraction sand and gravel filtration device according to claim 2, characterized in that, The first filter cylinder (201) has a second bearing hole on its left side. A first bearing is fixedly sleeved in the second bearing hole. The inner side of the inner ring of the first bearing is fixedly connected to the outer side of the oil passage pipe (102). The filter holes on the first filter cylinder (201), the second filter cylinder (202) and the third filter cylinder (203) increase in size from the outside to the inside.

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