A sand removal device used in oil and gas production wellhead devices

Abstract

The present invention relates to the field of downhole operations, and discloses a sand discharge device applied to an oil and gas production wellhead device, comprising an external casing, wherein the interior of the external casing is fixedly connected with a leather cup and rubber cylinder combined seal, the interior of the leather cup and rubber cylinder combined seal is fixedly connected with a protective sleeve, the interior of the protective sleeve is provided with a sand flushing pen tip, a fixed sleeve, a connecting oil pipe, a fixed sleeve and an adjusting mechanism, the side of the connecting oil pipe is fixedly connected with a telescopic rod, the side of the telescopic rod is fixedly connected with a turbine, the fixed sleeve is sleeved on the outside of the turbine, the connecting oil pipe is driven to rotate by the turbine, and the connecting oil pipe drives the sand flushing pen tip to move in a vertical direction while rotating, so that sand particles can be quickly cleaned, and the adjusting mechanism can adjust the balance between the sand flushing liquid entering from the liquid inlet pipe and the waste liquid recovered from the liquid outlet pipe, which is more conducive to continuous and stable sand flushing and sand discharge work.

Description

Technical Field

[0001] The present invention relates to the field of downhole operations, and in particular to a sand removal device used in an oil and gas production wellhead device. Background Art

[0002] During the formation and operation of oil and gas wells, sand production will occur inside the wells. The sand in the wells will gradually settle, thereby clogging the wells.

[0003] Publication No. CN115030670A discloses a sand flushing device comprising a cylinder, a first guide member, and a second guide member. The cylinder extends in a first direction and includes a common portion and a drainage portion. The common portion is provided with a water inlet and a drain outlet, and the drainage portion is provided with a filter hole. A first water outlet chamber is provided within the first guide member, and a water inlet chamber is provided between the first guide member and the cylinder. A drainage chamber is provided between the second guide member and the first guide member. A second water outlet chamber is provided between the second guide member and the drainage portion. A first channel and a second channel are provided within the second guide member, and a connecting channel is provided within the second guide member. The second water outlet chamber is connected to the filter hole and the drainage chamber. One end of the water inlet chamber is connected to the water inlet, and the other end is connected to the second channel. The second channel is connected to the first water outlet chamber and the drainage chamber to drain fluid in the drainage chamber into the first water outlet chamber. The first water outlet chamber is connected to the drain outlet. This application solves the problem of long sand removal time and low sand removal efficiency by sand bailing.

[0004] However, the existing sand flushing device has a relatively large flow area, and the flow rate and sand flushing position are relatively fixed, which results in a low flow rate and a small impact force, which is not conducive to sand flushing, resulting in an unsatisfactory sand flushing effect. At the same time, due to the long sand flushing time or repeated sand flushing, the sand flushing fluid is used too much, which has an impact on the environment. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a sand removal device applied to an oil and gas production wellhead device to solve the problems existing in the above-mentioned background technology.

[0006] The present invention provides the following technical solution: a sand removal device applied to an oil and gas production wellhead device, comprising an external casing, the interior of the external casing is fixedly connected to a leather cup and rubber cylinder combined packer, the interior of the leather cup and rubber cylinder combined packer is fixedly connected to a protective sleeve, the interior of the protective sleeve is provided with a sand flushing pen tip, a fixed sleeve, a connecting oil pipe, a fixed sleeve and an adjustment mechanism, the sand flushing pen tip is movably connected to the fixed sleeve, the fixed sleeve is fixedly connected to the protective sleeve, the connecting oil pipe is arranged on the side of the sand flushing pen tip and is movably connected to the protective sleeve, the sand flushing pen tip is movably connected to the connecting oil pipe, the connecting oil pipe is movably connected to the fixed sleeve, the fixed sleeve and the adjustment mechanism The mechanism is fixedly connected, the adjusting mechanism is fixedly connected to the external sleeve, the adjusting mechanism is fixedly connected to the liquid outlet pipe, the side of the adjusting mechanism is fixedly connected to the liquid inlet pipe, the side of the connecting oil pipe is fixedly connected to the telescopic rod, the telescopic rod is movably connected to the fixed sleeve, the side of the telescopic rod is fixedly connected to the turbine, and the fixed sleeve is sleeved on the outside of the turbine. The connecting oil pipe is driven to rotate by the turbine, and the connecting oil pipe drives the sand washing pen tip to move in the vertical direction while rotating, which can quickly clean the sand particles. The adjusting mechanism can adjust the balance of the sand washing liquid entering from the liquid inlet pipe and the waste liquid recovered from the liquid outlet pipe, which is more conducive to continuous and stable sand washing and sand discharge.

[0007] Furthermore, the sandblasting pen tip includes a sandblasting pen head and a connector, the sandblasting pen head and the connector are fixedly connected, a No. 2 through slot and a No. 3 through slot are provided on the sandblasting pen head, the No. 2 through slot and the No. 3 through slot are communicated with each other, the direction of the opening of the No. 3 through slot is toward the center, a No. 1 through slot is provided between the sandblasting pen head and the connector, the No. 1 through slot and the No. 2 through slot are communicated with each other, a spring is fixedly connected to the outer side surface of the sandblasting pen head, the spring is fixedly connected to the fixed sleeve, and the sandblasting pen head is movably connected to the fixed sleeve.

[0008] Furthermore, a circular through hole and a rectangular groove are provided on the connector, the circular through hole is communicated with the No. 1 through groove, a connecting block is fixedly connected to the outer end surface of the sandblasting pen head, and the connecting block is a convex block protruding outward, and a central through hole is provided at the center of the sandblasting pen head and the connector, and the central through hole is communicated with the interior of the connecting oil pipe.

[0009] When the sandblasting pen tip is pushed downward by the connecting oil pipe, the rectangular groove on the connector and the rectangular block on the connecting oil pipe are engaged, and the cylindrical stopper on the connecting oil pipe closes the circular through hole on the connector. At this time, the sandblasting liquid inside the connecting oil pipe is directly discharged from the central through hole on the sandblasting pen tip. When the connecting oil pipe moves upward, the sandblasting pen head moves upward due to the spring rebound. After the pipe shell is out of contact with the connector, most of the sandblasting liquid inside the connecting oil pipe is flushed out from the central through hole, and a small part enters the No. 1 through hole through the circular through hole, and then flushes out through the No. 2 through slot and the No. 3 through slot.

[0010] Furthermore, the connecting oil pipe includes a pipe shell, which is movably connected to the protective sleeve, a connecting head is fixedly connected to the outer surface of the pipe shell, a liquid inlet is provided on the pipe shell, and a connecting groove is provided on the inner wall of the protective sleeve, and the connecting head is arranged at the connecting groove and movably connected to the connecting groove.

[0011] Furthermore, a rectangular block and a cylindrical block are fixedly connected to the side of the connecting oil pipe, the rectangular block is movably connected to the rectangular groove, the cylindrical block is used to block the circular through hole, and a liquid outlet is opened at the center of the pipeline shell, and the liquid outlet is communicated with the central through hole.

[0012] When the sand flushing fluid passes through the turbine, it drives the turbine to rotate, and the turbine drives the connecting oil pipe to rotate. The connector fixed on the side of the connecting oil pipe moves on the connecting groove so that the connecting oil pipe can also perform a cyclic reciprocating motion in the vertical direction during the rotation motion.

[0013] Furthermore, a sealing assembly is fixedly connected between the external sleeve and the leather cup and rubber cylinder combined packer, and a communicating hole is provided on the leather cup and rubber cylinder combined packer.

[0014] Furthermore, a No. 1 chamber is opened between the connecting oil pipe and the external casing, a No. 2 chamber is opened between the leather cup and rubber cylinder combined seal and the protective sleeve, and the No. 2 chamber and the No. 3 chamber are connected through a connecting hole.

[0015] Furthermore, the adjustment mechanism includes a device shell and a pressure plate, the top of the pressure plate is fixedly connected to the liquid inlet pipe, the bottom of the pressure plate is fixedly connected to the fixed sleeve, a liquid inlet hole is provided on the pressure plate, the liquid inlet hole is used to connect the liquid inlet pipe and the fixed sleeve, a liquid inlet through-hole is provided on the device shell, the liquid inlet through-hole connects the No. 3 chamber and the liquid outlet pipe, a No. 1 groove is provided inside the device shell, a No. 2 groove is provided inside the pressure plate, both the No. 1 groove and the No. 2 groove are frustum-shaped grooves that are larger at the top and smaller at the bottom, a balance plate is fixedly connected to the outer surface of the pressure plate, the balance plate is arranged at the No. 1 groove, and the pressure plate and the device shell are movably connected.

[0016] During use, the sand washing liquid enters the regulating mechanism from the liquid inlet pipe, enters from the liquid inlet hole and gradually passes through the fixed sleeve and the connecting oil pipe, and is discharged from the tip of the sand washing pen. The liquid outlet pipe is externally connected to a negative pressure device. The waste liquid enters from the No. 2 chamber, enters the No. 3 chamber through the connecting hole, and then enters the regulating mechanism through the No. 3 chamber, and is discharged from the liquid outlet pipe. Beneficial effects

[0017] The sand discharge device is applied to an oil and gas production wellhead device. The device is provided with a sand flushing pen tip and a connecting oil pipe. During the sand flushing operation, a sand flushing fluid with a relatively high flow rate passes through the sand flushing pen tip when crushing sand, thereby improving the sand crushing effect and preventing sand particles from clogging the pen tip. After the sand is crushed, the flushing area is expanded, thereby improving the sand flushing effect.

[0018] The sand discharge device is applied to an oil and gas production wellhead device. The device is provided with an adjusting mechanism, which can adjust the amount of sand flushing fluid entering and the amount of waste fluid discharged, thereby achieving continuous and stable sand discharge operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a sand removal device applied to an oil and gas production wellhead device proposed by the present invention;

[0020] Figure 2 This is a structural schematic diagram of a sand removal device applied to an oil and gas production wellhead device proposed by the present invention;

[0021] Figure 3 This is a schematic diagram of the connecting oil pipe structure of a sand removal device applied to an oil and gas production wellhead device proposed by the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of a sand flushing pen head and connector of a sand discharge device applied to an oil and gas wellhead device proposed by the present invention;

[0023] Figure 5 This is a structural schematic diagram of a sand removal device applied to an oil and gas production wellhead device proposed by the present invention;

[0024] Figure 6 This is a structural schematic diagram of a sand removal device applied to an oil and gas production wellhead device proposed by the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of an adjustment mechanism of a sand removal device applied to an oil and gas production wellhead device proposed by the present invention;

[0026] Figure 8 This is a schematic diagram of the connecting groove structure of a sand removal device applied to an oil and gas production wellhead device proposed by the present invention.

[0027] Among them: 1. External casing; 2. Leather cup and rubber cylinder combined packer; 3. Protective sleeve; 4. Sand blasting pen tip; 401. Sand blasting pen tip; 402. Connector; 403. No. 1 through groove; 404. No. 2 through groove; 405. No. 3 through groove; 406. Connecting block; 407. Spring; 408. Circular through hole; 409. Rectangular groove; 410. Center through hole; 5. Connecting hole; 6. Fixed sleeve; 7. Connecting oil pipe; 701. Pipe shell; 702. Connector; 703. Liquid inlet; 7 04. Rectangular block; 705. Cylindrical block; 706. Liquid outlet; 8. Telescopic rod; 9. Turbine; 10. Fixed sleeve; 11. Adjustment mechanism; 1101. Device housing; 1102. Slot No. 1; 1103. Balance plate; 1104. Liquid inlet hole; 1105. Pressure plate; 1106. Liquid inlet hole; 1107. Slot No. 2; 12. Liquid outlet pipe; 13. Liquid inlet pipe; 14. Sealing assembly; 15. Connecting groove; 16. Chamber No. 1; 17. Chamber No. 2; 18. Chamber No. 3. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figures 1-6A sand removal device used in an oil and gas wellhead device includes an external casing 1, the interior of the external casing 1 is fixedly connected to a leather cup and rubber cylinder combined packer 2, the interior of the leather cup and rubber cylinder combined packer 2 is fixedly connected to a protective sleeve 3, the interior of the protective sleeve 3 is provided with a sand flushing pen tip 4, a fixed sleeve 6, a connecting oil pipe 7, a fixed sleeve 10 and an adjusting mechanism 11, the sand flushing pen tip 4 is movably connected to the fixed sleeve 6, the fixed sleeve 6 is fixedly connected to the protective sleeve 3, the connecting oil pipe 7 is arranged on the side of the sand flushing pen tip 4 and is movably connected to the protective sleeve 3, the sand flushing pen tip 4 and the connecting oil pipe 7 are movably connected, the connecting oil pipe 7 and the fixed sleeve 10 are movably connected, the fixed sleeve 10 and the adjusting mechanism 11 are fixedly connected, and the adjusting mechanism 11 is fixedly connected. The mechanism 11 is fixedly connected to the external sleeve 1, and a liquid outlet pipe 12 is fixedly connected to the adjusting mechanism 11. A liquid inlet pipe 13 is fixedly connected to the side of the adjusting mechanism 11. A telescopic rod 8 is fixedly connected to the side of the connecting oil pipe 7. The telescopic rod 8 is movably connected to the fixed sleeve 10. A turbine 9 is fixedly connected to the side of the telescopic rod 8. The fixed sleeve 10 is sleeved on the outside of the turbine 9. The connecting oil pipe 7 is driven to rotate by the turbine 9, and the connecting oil pipe 7 drives the sand washing pen tip 4 to move in the vertical direction while rotating, which can quickly clean the sand particles. The adjusting mechanism 11 can adjust the balance of the sand washing liquid entering from the liquid inlet pipe 13 and the waste liquid recovered from the liquid outlet pipe 12, which is more conducive to continuous and stable sand washing and sand discharge.

[0030] The sandblasting pen tip 4 includes a sandblasting pen head 401 and a connector 402, which are fixedly connected to the sandblasting pen head 401. A No. 2 through groove 404 and a No. 3 through groove 405 are provided on the sandblasting pen head 401. The No. 2 through groove 404 and the No. 3 through groove 405 are communicated with each other, and the opening of the No. 3 through groove 405 is directed toward the center. A No. 1 through groove 403 is provided between the sandblasting pen head 401 and the connector 402, and the No. 1 through groove 403 and the No. 2 through groove 404 are communicated with each other. A spring 407 is fixedly connected to the outer side surface of the sandblasting pen head 401, and the spring 407 is fixedly connected to the fixed sleeve 6. The sandblasting pen head 401 is movably connected to the fixed sleeve 6.

[0031] A circular through hole 408 and a rectangular groove 409 are provided on the connector 402. The circular through hole 408 is communicated with the No. 1 through groove 403. A connecting block 406 is fixedly connected to the outer end surface of the sandblasting pen head 401. The connecting block 406 is a convex block protruding outward. A central through hole 410 is provided at the center of the sandblasting pen head 401 and the connector 402. The central through hole 410 is communicated with the interior of the connecting oil pipe 7.

[0032] What needs to be specifically explained in this embodiment is that: when the sandblasting pen tip 4 is pushed downward by the connecting oil pipe 7, the rectangular groove 409 on the connector 402 and the rectangular block 704 on the connecting oil pipe 7 are engaged, and the cylindrical stopper 705 on the connecting oil pipe 7 closes the circular through hole 408 on the connector 402. At this time, the sandblasting liquid inside the connecting oil pipe 7 is directly discharged from the central through hole 410 on the sandblasting pen tip 4. When the connecting oil pipe 7 moves upward, the sandblasting pen tip 401 rebounds upward through the spring 407. After the pipe housing 701 is out of contact with the connector 402, most of the sandblasting liquid inside the connecting oil pipe 7 is flushed out from the central through hole 410, and a small part enters the No. 1 through hole 408 into the No. 1 through groove 403, and then flushes out through the No. 2 through groove 404 and the No. 3 through groove 405.

[0033] Among them, the sandblasting pen tip 4 is driven to rotate by the cooperation of the rectangular block 704 and the rectangular groove 409 when the pipe shell 701 moves downward. At the same time, the sandblasting pen tip 4 is also pushed downward by the connecting oil pipe 7, thereby stretching the spring 407. At this time, the pipe shell 701 and the connector 402 are fitted together and the cylindrical stopper 705 blocks the circular through hole 408. The sandblasting liquid inside the pipe shell 701 enters the connector 402 from the pipe shell 701 and comes out from the sandblasting pen tip 401. The sandblasting liquid coming out of the central through hole 410 has a faster flow rate. When the sandblasting pen tip 401 moves downward, the tip of the pen tip can form a sharp impact point, which has a destructive effect on the surface of the sand surface and makes it loose. At the same time, the sandblasting pen tip 401 is still rotating, thereby increasing the area of ​​impact and grinding on the hard sand surface, making it more 405 , the sand washing tip 401 is flushed and the sand washing speed is increased, and the sand washing speed is increased, and the sand washing speed is increased, and the sand washing speed is increased, and the sand washing speed is increased.

[0034] See also Figures 1-6 、 Figure 8The connecting oil pipe 7 includes a pipeline shell 701, which is movably connected to the protective sleeve 3. A connecting head 702 is fixedly connected to the outer surface of the pipeline shell 701. A liquid inlet 703 is provided on the pipeline shell 701. A connecting groove 15 is provided on the inner wall of the protective sleeve 3. The connecting head 702 is arranged at the connecting groove 15 and is movably connected to the connecting groove 15.

[0035] A rectangular block 704 and a cylindrical block 705 are fixedly connected to the side of the connecting oil pipe 7. The rectangular block 704 is movably connected to the rectangular groove 409. The cylindrical block 705 is used to block the circular through hole 408. A liquid outlet 706 is opened at the center of the pipeline shell 701, and the liquid outlet 706 is communicated with the central through hole 410.

[0036] What needs to be specifically explained in this embodiment is that: when the sand flushing fluid enters the turbine 9, it drives the turbine 9 to rotate, and the turbine 9 drives the connecting oil pipe 7 to rotate. The connecting head 702 fixedly connected to the side of the connecting oil pipe 7 moves on the connecting groove 15, so that the connecting oil pipe 7 can also perform a circular reciprocating motion in the vertical direction while rotating.

[0037] A sealing assembly 14 is fixedly connected between the external casing 1 and the leather cup and rubber cylinder combined packer 2 , and a communicating hole 5 is formed on the leather cup and rubber cylinder combined packer 2 .

[0038] A first chamber 16 is defined between the connecting oil pipe 7 and the external casing 1 , a second chamber 17 is defined between the leather cup and rubber cylinder combined packer 2 and the protective sleeve 3 , and the second chamber 17 and the third chamber 18 are connected through the communicating hole 5 .

[0039] See also Figure 1 、 Figure 5 and Figure 7 The regulating mechanism 11 includes a device housing 1101 and a pressure plate 1105. The top of the pressure plate 1105 is fixedly connected to the liquid inlet pipe 13, and the bottom of the pressure plate 1105 is fixedly connected to the fixed sleeve 10. A liquid inlet hole 1106 is provided on the pressure plate 1105. The liquid inlet hole 1106 is used to connect the liquid inlet pipe 13 and the fixed sleeve 10. A liquid inlet through-hole 1104 is provided on the device housing 1101. The liquid inlet through-hole 1104 connects the No. 3 chamber 18 and the liquid outlet pipe 12. A No. 1 groove 1102 is provided inside the device housing 1101, and a No. 2 groove 1107 is provided inside the pressure plate 1105. Both the No. 1 groove 1102 and the No. 2 groove 1107 are frustum-shaped grooves with a larger top and a smaller bottom. A balance plate 1103 is fixedly connected to the outer surface of the pressure plate 1105. The balance plate 1103 is arranged at the No. 1 groove 1102, and the pressure plate 1105 and the device housing 1101 are movably connected.

[0040] What needs to be specifically explained in this embodiment is that during use, the sand washing liquid enters the regulating mechanism 11 from the liquid inlet pipe 13, enters from the liquid inlet hole 1106 and gradually passes through the fixed sleeve 10 and the connecting oil pipe 7, and is discharged from the sand washing pen tip 4. The liquid outlet pipe 12 is externally connected to a negative pressure device, and the waste liquid enters from the No. 2 chamber 17, enters the No. 3 chamber 18 through the connecting hole 5, and then enters the regulating mechanism 11 through the No. 3 chamber 18, and is then discharged from the liquid outlet pipe 12.

[0041] Among them, the sand washing liquid enters from the liquid inlet hole 1106 and passes through the pressure plate 1105, driving the pressure plate 1105 to move downward, and the waste liquid enters the interior of the device housing 1101 from the liquid inlet hole 1104, drives the balance plate 1103 to move upward when passing through the balance plate 1103, and flows out from the liquid outlet pipe 12. In this process, when the flow rate of the sand washing liquid entering the liquid inlet pipe 13 is greater than the flow rate of the waste liquid entering from the liquid inlet hole 1104, that is, when the downward pressure on the pressure plate 1105 is greater than the upward thrust on the balance plate 1103, the pressure plate 1105 and the balance plate 1103 move downward as a whole, and the space between the second slot 1107 and the pressure plate 1105 is large. The gap is reduced, thereby reducing the flow rate of the sand washing liquid. When the flow rate of the sand washing liquid entering the liquid inlet pipe 13 is less than the flow rate of the waste liquid entering from the liquid inlet through hole 1104, that is, the downward pressure on the pressure plate 1105 is less than the upward thrust on the balance plate 1103, the pressure plate 1105 and the balance plate 1103 move upward as a whole, the gap between the balance plate 1103 and the device housing 1101 increases, and the waste liquid is discharged faster. At the same time, the gap between the pressure plate 1105 and the No. 2 trough 1107 increases, thereby increasing the flow rate of the sand washing liquid, making the discharge of the sand washing liquid and the discharge of the waste liquid relatively balanced, which is more conducive to continuous and stable sand washing and sand discharge operations.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A sand removal device for oil and gas production wellhead equipment, comprising an external casing (1), characterized in that: The outer sleeve (1) is fixedly connected to a leather cup and rubber cylinder combined packer (2) inside, and the leather cup and rubber cylinder combined packer (2) is fixedly connected to a protective sleeve (3) inside, and a sand blasting pen tip (4), a fixed sleeve (6), a connecting oil pipe (7), a fixing sleeve (10) and an adjusting mechanism (11) are provided inside the protective sleeve (3), the sand blasting pen tip (4) is movably connected to the fixing sleeve (6), the fixing sleeve (6) is fixedly connected to the protective sleeve (3), the connecting oil pipe (7) is provided on the side of the sand blasting pen tip (4) and is movably connected to the protective sleeve (3), the sand blasting pen tip (4) and the connecting oil pipe (7) are movably connected, the connecting oil pipe (7) and the fixing sleeve (10) are movably connected, the fixing sleeve (10) and the adjusting mechanism (11) are fixedly connected, and the adjusting mechanism (11) and the outer sleeve (1) are fixedly connected. The upper sleeve (1) is fixedly connected, the regulating mechanism (11) is fixedly connected with a liquid outlet pipe (12), the side of the regulating mechanism (11) is fixedly connected with a liquid inlet pipe (13), the side of the connecting oil pipe (7) is fixedly connected with a telescopic rod (8), the telescopic rod (8) is movably connected to the fixed sleeve (10), the side of the telescopic rod (8) is fixedly connected with a turbine (9), the fixed sleeve (10) is sleeved on the outside of the turbine (9), the connecting oil pipe (7) is driven to rotate by the turbine (9), and the connecting oil pipe (7) drives the sand washing pen tip (4) to move in the vertical direction while rotating, so that the sand particles can be quickly cleaned, and the regulating mechanism (11) can adjust the balance between the sand washing liquid entering from the liquid inlet pipe (13) and the waste liquid recovered from the liquid outlet pipe (12), which is more conducive to continuous and stable sand washing and sand discharge work; The sandblasting pen tip (4) comprises a sandblasting pen head (401) and a connector (402), wherein the sandblasting pen head (401) and the connector (402) are fixedly connected, a second through slot (404) and a third through slot (405) are provided on the sandblasting pen head (401), wherein the second through slot (404) and the third through slot (405) are communicated with each other, and the opening of the third through slot (405) is oriented toward the center, a first through slot (403) is provided between the sandblasting pen head (401) and the connector (402), wherein the first through slot (403) and the second through slot (404) are communicated with each other, a spring (407) is fixedly connected to the outer side surface of the sandblasting pen head (401), wherein the spring (407) is fixedly connected to the fixed sleeve (6), and the sandblasting pen head (401) is movably connected to the fixed sleeve (6); The connector (402) is provided with a circular through hole (408) and a rectangular groove (409), wherein the circular through hole (408) is communicated with the No. 1 through groove (403), and a connecting block (406) is fixedly connected to the outer end surface of the sandblasting pen head (401), wherein the connecting block (406) is a convex block protruding outwards, and a central through hole (410) is provided at the center of the sandblasting pen head (401) and the connector (402), wherein the central through hole (410) is communicated with the interior of the connecting oil pipe (7).

2. The sand removal device for oil and gas production wellhead according to claim 1, characterized in that: The connecting oil pipe (7) comprises a pipe housing (701), the pipe housing (701) is movably connected to the protective sleeve (3), a connector (702) is fixedly connected to the outer surface of the pipe housing (701), a liquid inlet (703) is provided on the pipe housing (701), a connecting groove (15) is provided on the inner wall of the protective sleeve (3), and the connector (702) is arranged at the connecting groove (15) and is movably connected to the connecting groove (15).

3. The sand removal device for oil and gas production wellhead according to claim 2, characterized in that: A rectangular block (704) and a cylindrical block (705) are fixedly connected to the side of the connecting oil pipe (7), the rectangular block (704) is movably connected to the rectangular groove (409), and the cylindrical block (705) is used to block the circular through hole (408). A liquid outlet (706) is opened at the center of the pipeline shell (701), and the liquid outlet (706) is communicated with the central through hole (410).

4. The sand removal device for oil and gas production wellhead according to claim 1, characterized in that: A sealing assembly (14) is fixedly connected between the external sleeve (1) and the leather cup and rubber cylinder combined packer (2), and a communicating hole (5) is provided on the leather cup and rubber cylinder combined packer (2).

5. The sand removal device for oil and gas production wellhead according to claim 4, characterized in that: A first chamber (16) is provided between the connecting oil pipe (7) and the external casing (1), a second chamber (17) is provided between the leather cup and rubber cylinder combined packer (2) and the protective sleeve (3), and the second chamber (17) and the third chamber (18) are connected through a connecting hole (5).

6. The sand removal device for oil and gas production wellhead equipment according to claim 1, characterized in that: The regulating mechanism (11) comprises a device housing (1101) and a pressure plate (1105), wherein the top of the pressure plate (1105) is fixedly connected to the liquid inlet pipe (13), and the bottom of the pressure plate (1105) is fixedly connected to the fixing sleeve (10). The pressure plate (1105) is provided with a liquid inlet hole (1106), and the liquid inlet hole (1106) is used to connect the liquid inlet pipe (13) and the fixing sleeve (10). The device housing (1101) is provided with a liquid inlet through hole (1104), and the liquid inlet through hole (1104) is connected to three No. 1 chamber (18) and a liquid outlet pipe (12), a No. 1 groove (1102) is provided inside the device housing (1101), a No. 2 groove (1107) is provided inside the pressure plate (1105), the No. 1 groove (1102) and the No. 2 groove (1107) are both truncated cone-shaped grooves with a larger upper portion and a smaller lower portion, a balance plate (1103) is fixedly connected to the outer surface of the pressure plate (1105), the balance plate (1103) is arranged at the No. 1 groove (1102), and the pressure plate (1105) and the device housing (1101) are movably connected.

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