Sand discharging device applied to oil and gas production wellhead device

Abstract

The invention relates to the field of underground operation, and discloses a sand discharging device applied to an oil and gas production wellhead device, which comprises an external casing pipe, a leather cup and rubber sleeve combined packer is fixedly connected in the external casing pipe, a protective sleeve is fixedly connected in the leather cup and rubber sleeve combined packer, and the protective sleeve is fixedly connected in the external casing pipe. A sand washing pen point, a fixing sleeve, a connecting oil pipe, a fixing sleeve and an adjusting mechanism are arranged in the protective sleeve, a telescopic rod is fixedly connected to the side face of the connecting oil pipe, a turbine is fixedly connected to the side face of the telescopic rod, and the turbine is sleeved with the fixing sleeve. The connecting oil pipe drives the sand washing pen point to rotate and move in the vertical direction at the same time, sand can be rapidly cleaned, the adjusting mechanism can adjust balance of sand washing liquid entering from the liquid inlet pipe and waste liquid recycled from the liquid outlet pipe, and continuous and stable sand washing and sand discharging work is more facilitated.

Description

Technical Field

[0001] The present invention relates to the field of downhole operations, and specifically to a sand discharging device applied to oil and gas production wellhead devices. Background Art

[0002] During the formation and operation of oil wells and natural gas wells, sand production phenomenon will occur inside. The sand in the oil wells gradually deposits, thus blocking the oil wells and natural gas wells.

[0003] Publication No. CN115030670A discloses a sand flushing device, including a cylinder body, a first flow guiding member and a second flow guiding member; the cylinder body extends along a first direction, the cylinder body includes a common part and a drainage part, the common part is provided with a water inlet and a water outlet, and the drainage part is provided with filter holes; a first water outlet cavity is arranged inside the first flow guiding member, and a water inlet cavity is arranged between the first flow guiding member and the cylinder body; a drainage cavity is arranged between the second flow guiding member and the first flow guiding member; a second water outlet cavity is arranged between the second flow guiding member and the drainage part; a first channel and a second channel are arranged inside the second flow guiding member, and a connecting channel is arranged inside the second flow guiding member; the second water outlet cavity communicates with the filter holes and the drainage cavity; one end of the water inlet cavity is connected to the water inlet, the other end is communicated with the second channel, the second channel is communicated with the first water outlet cavity and the drainage cavity to drain the fluid in the drainage cavity into the first water outlet cavity, and the first water outlet cavity is communicated with the water outlet. This application solves the problems of long time required for sand removal by the sand fishing method and low sand removal efficiency.

[0004] However, for the existing sand flushing devices, due to their relatively large flow-through area, and the relatively fixed flow rate and sand flushing position, the flow velocity is low and the impact force is small, which is not conducive to sand flushing. Therefore, the sand flushing effect is not ideal; at the same time, due to the long sand flushing time or repeated sand flushing, too much sand flushing fluid is also used, 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 discharging device applied to oil and gas production wellhead devices to solve the problems existing in the above background art.

[0006] The present invention provides the following technical solution: A sand discharging device applied to an oil and gas production wellhead device, including an outer casing. A cup-packer is fixedly connected inside the outer casing. A protective sleeve is fixedly connected inside the cup-packer. A sand washing tip, a fixed sleeve, a connecting oil pipe, a fixed sleeve and an adjusting mechanism are arranged inside the protective sleeve. The sand washing tip is movably connected with the fixed sleeve. The fixed sleeve is fixedly connected with the protective sleeve. The connecting oil pipe is arranged on the side of the sand washing tip and is movably connected with the protective sleeve. The sand washing tip and the connecting oil pipe are movably connected. The connecting oil pipe and the fixed sleeve are movably connected. The fixed sleeve is fixedly connected with the adjusting mechanism. The adjusting mechanism is fixedly connected with the outer casing. A liquid outlet pipe is fixedly connected to the adjusting mechanism. A liquid inlet pipe is fixedly connected to the side of the adjusting mechanism. A telescopic rod is fixedly connected to the side of the connecting oil pipe. The telescopic rod is movably connected with the fixed sleeve. A turbine is fixedly connected to the side of the telescopic rod. The fixed sleeve is sleeved outside the turbine. The connecting oil pipe is driven to rotate by the turbine. The connecting oil pipe drives the sand washing tip to move vertically while rotating, which can quickly clean the sand particles. The adjusting mechanism can adjust the balance between 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 continuously and smoothly carrying out sand washing and sand discharging work.

[0007] Further, the sand washing tip includes a sand washing head and a connector. The sand washing head and the connector are fixedly connected. A second through groove and a third through groove are formed in the sand washing head. The second through groove and the third through groove are communicated. The opening direction of the third through groove faces the center. A first through groove is formed between the sand washing head and the connector. The first through groove and the second through groove are communicated. A spring is fixedly connected to the outer side surface of the sand washing head. The spring is fixedly connected with the fixed sleeve. The sand washing head is movably connected with the fixed sleeve.

[0008] Further, a circular through hole and a rectangular groove are formed in the connector. The circular through hole is communicated with the first through groove. A connecting block is fixedly connected to the outer end surface of the sand washing head. The connecting block is a convex block protruding outward. Central through holes are formed at the centers of the sand washing head and the connector. The central through holes are communicated with the inside of the connecting oil pipe.

[0009] When the sand washing tip is pushed downward by the connecting oil pipe, the rectangular groove on the connector is engaged with the rectangular block on the connecting oil pipe, and the cylindrical stop block on the connecting oil pipe closes the circular through hole on the connector. At this time, the sand washing liquid inside the connecting oil pipe directly discharges from the central through hole on the sand washing tip. When the connecting oil pipe moves upward, the sand washing head rebounds upward through the spring. After the pipe housing is separated from the connector, most of the sand washing liquid inside the connecting oil pipe flushes out from the central through hole, and a small part enters the first through groove through the circular through hole, and then flushes out through the second through groove and the third through groove.

[0010] Further, the connecting oil pipe includes a pipe housing, the pipe housing is movably connected to the protective sleeve, a connector is fixedly connected to the outer side surface of the pipe housing, a liquid inlet is formed in the pipe housing, a connecting groove is formed in the inner wall of the protective sleeve, and the connector is arranged at the connecting groove and is movably connected to the connecting groove.

[0011] Further, a rectangular block and a cylindrical stopper are fixedly connected to the side surface of the connecting oil pipe, the rectangular block is movably connected to the rectangular groove, the cylindrical stopper is used to block the circular through hole, a liquid outlet is formed at the center of the pipe housing, and the liquid outlet communicates with the central through hole.

[0012] When the sand washing fluid passes through the turbine, it drives the turbine to rotate, the turbine drives the connecting oil pipe to rotate, and the connector fixedly connected to the side surface of the connecting oil pipe moves on the connecting groove, so that the connecting oil pipe can perform a reciprocating motion in the vertical direction while rotating.

[0013] Further, a sealing assembly is fixedly connected between the outer casing and the cup packer, and a communication hole is formed in the cup packer.

[0014] Further, a first chamber is formed between the connecting oil pipe and the outer casing, a second chamber is formed between the cup packer and the protective sleeve, and the second chamber communicates with the third chamber through the communication hole.

[0015] Further, the adjusting mechanism includes a device housing 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 formed in the pressure plate for communicating the liquid inlet pipe and the fixed sleeve, a liquid inlet through hole is formed in the device housing for communicating the third chamber and the liquid outlet pipe, a first groove is formed inside the device housing, a second groove is formed inside the pressure plate, both the first groove and the second groove are frustum-shaped grooves with a larger upper part and a smaller lower part, a balance plate is fixedly connected to the outer side surface of the pressure plate, the balance plate is arranged at the first groove, and the pressure plate is movably connected to the device housing.

[0016] During use, the sand washing fluid enters the adjusting mechanism from the liquid inlet pipe, enters through the liquid inlet hole and gradually passes through the fixed sleeve and the connecting oil pipe, and is discharged from the sand washing pen tip. The liquid outlet pipe is externally connected to a negative pressure device, the waste liquid enters from the second chamber, enters the third chamber through the communication hole, then enters the adjusting mechanism through the third chamber, and is discharged from the liquid outlet pipe. Beneficial effects

[0017] The sand removal device applied to the oil and gas production wellhead device is provided with a sand washing tip and a connecting oil pipe. During the sand washing operation, when crushing sand at the sand washing tip, a sand washing liquid with a relatively high flow rate is used, which can improve the sand crushing effect and avoid sand particles blocking the tip. After sand crushing, the scouring area is enlarged, thereby improving the sand washing effect.

[0018] The sand removal device applied to the oil and gas production wellhead device is provided with an adjustment mechanism, which can adjust the inflow of the sand washing liquid and the outflow of the waste liquid, so as to achieve continuous and stable sand removal operation. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a sand removal device applied to the oil and gas production wellhead device proposed by the present invention; Figure 2 It is a schematic structural diagram of a sand removal device applied to the oil and gas production wellhead device proposed by the present invention; Figure 3 It is a schematic structural diagram of the connecting oil pipe of a sand removal device applied to the oil and gas production wellhead device proposed by the present invention; Figure 4 It is a schematic structural diagram of the sand washing tip and the connector of a sand removal device applied to the oil and gas production wellhead device proposed by the present invention; Figure 5 It is a schematic structural diagram of a sand removal device applied to the oil and gas production wellhead device proposed by the present invention; Figure 6 It is a schematic structural diagram of a sand removal device applied to the oil and gas production wellhead device proposed by the present invention; Figure 7 It is a schematic structural diagram of the adjustment mechanism of a sand removal device applied to the oil and gas production wellhead device proposed by the present invention; Figure 8 It is a schematic structural diagram of the connecting groove of a sand removal device applied to the oil and gas production wellhead device proposed by the present invention.

[0020] Wherein: 1. Outer casing; 2. Packer with cup and rubber barrel combination; 3. Protective sleeve; 4. Sand washing tip; 401. Sand washing head; 402. Connector; 403. First through slot; 404. Second through slot; 405. Third through slot; 406. Connecting block; 407. Spring; 408. Circular through hole; 409. Rectangular groove; 410. Central through hole; 5. Communication hole; 6. Fixed sleeve; 7. Connecting oil pipe; 701. Pipe housing; 702. Connector; 703. Liquid inlet; 704. Rectangular block; 705. Cylindrical stopper; 706. Liquid outlet; 8. Telescopic rod; 9. Turbine; 10. Fixed sleeve; 11. Adjusting mechanism; 1101. Device housing; 1102. First slot; 1103. Balancing plate; 1104. Liquid inlet through hole; 1105. Pressure plate; 1106. Liquid inlet hole; 1107. Second slot; 12. Liquid outlet pipe; 13. Liquid inlet pipe; 14. Sealing assembly; 15. Connecting slot; 16. First chamber; 17. Second chamber; 18. Third chamber. Specific embodiments

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1 - 6, A sand discharging device applied to an oil and gas production wellhead device, comprising an outer casing 1. Inside the outer casing 1, a cup rubber packer 2 is fixedly connected. Inside the cup rubber packer 2, a protective sleeve 3 is fixedly connected. Inside the protective sleeve 3, a sand flushing tip 4, a fixed sleeve 6, a connecting oil pipe 7, a fixed sleeve 10 and an adjusting mechanism 11 are arranged. The sand flushing 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 tip 4 and is movably connected to the protective sleeve 3. The sand flushing 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, the adjusting mechanism 11 and the outer casing 1 are fixedly connected. An outlet pipe 12 is fixedly connected to the adjusting mechanism 11, an 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 outside the turbine 9. By driving the connecting oil pipe 7 to rotate through the turbine 9, the connecting oil pipe 7 drives the sand flushing tip 4 to move in the vertical direction while rotating, which can quickly clean the sand grains. The adjusting mechanism 11 can adjust the balance between the sand flushing liquid entering from the inlet pipe 13 and the waste liquid recovered from the outlet pipe 12, which is more conducive to continuously and smoothly carrying out sand flushing and sand discharging work.

[0023] The sand flushing tip 4 includes a sand flushing head 401 and a connector 402. The sand flushing head 401 and the connector 402 are fixedly connected. A second through groove 404 and a third through groove 405 are formed in the sand flushing head 401. The second through groove 404 and the third through groove 405 are communicated. The direction of the opening of the third through groove 405 faces the center. A first through groove 403 is formed between the sand flushing head 401 and the connector 402. The first through groove 403 and the second through groove 404 are communicated. A spring 407 is fixedly connected to the outer side surface of the sand flushing head 401. The spring 407 is fixedly connected to the fixed sleeve 6. The sand flushing head 401 is movably connected to the fixed sleeve 6.

[0024] A circular through hole 408 and a rectangular groove 409 are formed in the connector 402. The circular through hole 408 is communicated with the first through groove 403. A connecting block 406 is fixedly connected to the outer end surface of the sand flushing head 401. The connecting block 406 is a convex block protruding outwards. Central through holes 410 are formed at the centers of the sand flushing head 401 and the connector 402. The central through holes 410 are communicated with the inside of the connecting oil pipe 7.

[0025] In this embodiment, it should be specifically noted that when the sand washing tip 4 is pushed downward by the connecting tubing 7, the rectangular groove 409 on the connector 402 engages with the rectangular block 704 on the connecting tubing 7, and the cylindrical stopper 705 on the connecting tubing 7 closes the circular through-hole 408 on the connector 402. At this time, the sand washing fluid inside the connecting tubing 7 directly discharges from the central through-hole 410 on the sand washing tip 4. When the connecting tubing 7 moves upward, the sand washing head 401 rebounds upward through the spring 407. After the pipe housing 701 disengages from the connector 402, most of the sand washing fluid inside the connecting tubing 7 flushes out from the central through-hole 410, and a small part enters the first through-channel 403 through the circular through-hole 408, and then flushes out through the second through-channel 404 and the third through-channel 405.

[0026] Among them, when the pipe housing 701 moves downward, the sand washing tip 4 is driven to rotate by the cooperation of the rectangular block 704 and the rectangular groove 409. At the same time, the sand washing tip 4 is also pushed downward by the connecting tubing 7, thereby stretching the spring 407. At this time, the pipe housing 701 and the connector 402 are fitted together and the cylindrical stopper 705 blocks the circular through-hole 408. The sand washing fluid inside the pipe housing 701 all enters the connector 402 from the pipe housing 701 and comes out from the sand washing head 401. The flow rate of the sand washing fluid coming out from the central through-hole 410 is relatively fast. When the sand washing head 401 moves downward, the tip part of the tip can form a sharp impact point, which plays a destructive role on the surface layer of the sand surface, making it loose. At the same time, the sand washing head 401 is also rotating, thereby increasing the area of impact and abrasion drilling on the hard sand surface, which is more conducive to quickly crushing the sand. When the sand washing fluid flows out at the central through-hole 410, the relatively fast flow rate will make the sand washing force greater. When the sand washing head 401 moves downward, the sand washing fluid will quickly spread to the end face of the sand washing head 401, forming a water film at the end face of the sand washing head 401, which can prevent the sand washing head 401 from being blocked by sand grains during sand crushing. When the sand washing head 401 and the connector 402 move upward due to the rebound of the spring 407, at this time, the cylindrical stopper 705 and the circular through-hole 408 are separated. When the sand washing head 401 moves upward, the flushing fluid is divided into three parts when entering the sand washing tip 4. One part comes out from the central through-hole 410, and the other parts come out from the second through-channel 404 and the third through-channel 405. The flushing range is wider. After the sand washing head 401 crushes the sand, through large-scale flushing, the speed and efficiency of sand washing can be improved.

[0027] Please refer to Figures 1 - 6 、 Figure 8, the connecting oil pipe 7 includes 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 side 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.

[0028] A rectangular block 704 and a cylindrical stopper 705 are fixedly connected to the side surface of the connecting oil pipe 7. The rectangular block 704 is movably connected to the rectangular groove 409. The cylindrical stopper 705 is used to block the circular through hole 408. A liquid outlet 706 is provided at the center of the pipe housing 701, and the liquid outlet 706 communicates with the central through hole 410.

[0029] In this embodiment, it should be specifically noted that when the sand washing liquid passes through the turbine 9, it drives the turbine 9 to rotate. The turbine 9 drives the connecting oil pipe 7 to rotate. The connector 702 fixedly connected to the side surface of the connecting oil pipe 7 moves on the connecting groove 15, so that the connecting oil pipe 7 can perform a reciprocating motion in the vertical direction while rotating.

[0030] A sealing assembly 14 is fixedly connected between the outer casing 1 and the cup packer 2. A communication hole 5 is provided on the cup packer 2.

[0031] A first chamber 16 is provided between the connecting oil pipe 7 and the outer casing 1. A second chamber 17 is provided between the cup packer 2 and the protective sleeve 3. The second chamber 17 and the third chamber 18 are communicated through the communication hole 5.

[0032] Please refer to Figure 1 、 Figure 5 and Figure 7 , the adjusting 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, 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 communicate 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 communicates the third chamber 18 and the liquid outlet pipe 12. A first groove 1102 is provided inside the device housing 1101. A second groove 1107 is provided inside the pressure plate 1105. Both the first groove 1102 and the second groove 1107 are frustum-shaped grooves with a larger upper part and a smaller lower part. A balance plate 1103 is fixedly connected to the outer side surface of the pressure plate 1105. The balance plate 1103 is arranged at the first groove 1102, and the pressure plate 1105 is movably connected to the device housing 1101.

[0033] In this embodiment, it should be specifically noted that during the use process, the sand washing fluid enters the adjusting mechanism 11 from the liquid inlet pipe 13, enters through 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. The waste liquid enters from the second chamber 17, enters the third chamber 18 through the communication hole 5, then enters the adjusting mechanism 11 through the third chamber 18, and is finally discharged from the liquid outlet pipe 12.

[0034] Among them, the sand washing fluid enters through the liquid inlet hole 1106 and passes through the pressure plate 1105, driving the pressure plate 1105 to move downward. The waste liquid enters the interior of the device housing 1101 through the liquid inlet through 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. During this process, when the flow rate of the sand washing fluid entering from the liquid inlet pipe 13 is greater than the flow rate of the waste liquid entering from the liquid inlet through 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 gap between the second groove 1107 and the pressure plate 1105 decreases, thereby reducing the flow rate of the sand washing fluid. When the flow rate of the sand washing fluid entering from 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, when 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 second groove 1107 increases, thereby increasing the flow rate of the sand washing fluid, making the inflow of the sand washing fluid and the discharge of the waste liquid relatively balanced, and being more conducive to continuously and stably performing sand washing and sand discharging operations.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and deformations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sand discharging device applied to an oil and gas production wellhead device, comprising an outer casing (1), characterized in that: Inside the external casing (1), a cup-packer assembly (2) is fixedly connected. Inside the cup-packer assembly (2), a protective sleeve (3) is fixedly connected. Inside the protective sleeve (3), a sand washing tip (4), a fixed sleeve (6), a connecting oil pipe (7), a fixing sleeve (10), and an adjusting mechanism (11) are provided. The sand washing 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 washing tip (4) and is movably connected to the protective sleeve (3). The sand washing 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. The adjusting mechanism (11) and the external casing (1) are fixedly connected. An outlet pipe (12) is fixedly connected to the adjusting mechanism (11). An 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 fixing sleeve (10). A turbine (9) is fixedly connected to the side of the telescopic rod (8). The fixing sleeve (10) is sleeved outside the turbine (9). By driving the turbine (9), the connecting oil pipe (7) rotates. While the connecting oil pipe (7) drives the sand washing tip (4) to rotate, the sand washing tip (4) moves in the vertical direction, enabling rapid cleaning of sand grains. The adjusting mechanism (11) can adjust the balance between the sand washing fluid entering from the inlet pipe (13) and the waste liquid recovered from the outlet pipe (12), which is more conducive to continuously and smoothly carrying out sand washing and sand discharging work.

2. The sand discharging device applied to the oil and gas production wellhead device according to claim 1, wherein: The sand washing tip (4) includes a sand washing head (401) and a connector (402). The sand washing head (401) and the connector (402) are fixedly connected. A second through groove (404) and a third through groove (405) are formed in the sand washing head (401). The second through groove (404) and the third through groove (405) are communicated. The opening direction of the third through groove (405) faces the center. A first through groove (403) is formed between the sand washing head (401) and the connector (402). The first through groove (403) and the second through groove (404) are communicated. A spring (407) is fixedly connected to the outer side surface of the sand washing head (401). The spring (407) is fixedly connected to the fixed sleeve (6). The sand washing head (401) is movably connected to the fixed sleeve (6).

3. The sand discharging device applied to the oil and gas production wellhead device according to claim 2, characterized in that: A circular through hole (408) and a rectangular groove (409) are formed in the connector (402). The circular through hole (408) is communicated with the first through groove (403). A connecting block (406) is fixedly connected to the outer end surface of the sand washing head (401). The connecting block (406) is a convex block protruding outward. Central through holes (410) are formed at the centers of both the sand washing head (401) and the connector (402). The central through holes (410) are communicated with the inside of the connecting oil pipe (7).

4. The sand discharging device applied to the oil and gas production wellhead device according to claim 3, characterized in that: The connecting oil pipe (7) includes 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 side surface of the pipe housing (701), a liquid inlet (703) is formed in the pipe housing (701), a connecting groove (15) is formed in 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).

5. The sand discharging device applied to the oil and gas production wellhead device according to claim 4, characterized in that: A rectangular block (704) and a cylindrical stopper (705) are fixedly connected to the side surface of the connecting oil pipe (7), the rectangular block (704) is movably connected to the rectangular groove (409), the cylindrical stopper (705) is used to block the circular through hole (408), a liquid outlet (706) is formed in the center of the pipe housing (701), and the liquid outlet (706) communicates with the central through hole (410).

6. The sand discharging device applied to the oil and gas production wellhead device according to claim 1, wherein: A sealing assembly (14) is fixedly connected between the outer casing (1) and the cup-packer assembly (2), and a communication hole (5) is formed in the cup-packer assembly (2).

7. The sand discharging device applied to the oil and gas production wellhead device according to claim 6, characterized in that: A first chamber (16) is formed between the connecting oil pipe (7) and the outer casing (1), a second chamber (17) is formed between the cup-packer assembly (2) and the protective sleeve (3), and the second chamber (17) communicates with the third chamber (18) through the communication hole (5).

8. The sand discharging device applied to the oil and gas production wellhead device according to claim 1, wherein: The adjusting 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), the bottom of the pressure plate (1105) is fixedly connected to the fixed sleeve (10), a liquid inlet hole (1106) is formed in the pressure plate (1105), the liquid inlet hole (1106) is used to communicate the liquid inlet pipe (13) and the fixed sleeve (10), a liquid inlet through hole (1104) is formed in the device housing (1101), the liquid inlet through hole (1104) communicates the third chamber (18) and the liquid outlet pipe (12), a first groove (1102) is formed inside the device housing (1101), a second groove (1107) is formed inside the pressure plate (1105), both the first groove (1102) and the second groove (1107) are frustum-shaped grooves with a larger upper part and a smaller lower part, a balance plate (1103) is fixedly connected to the outer side surface of the pressure plate (1105), the balance plate (1103) is arranged at the first groove (1102), and the pressure plate (1105) is movably connected to the device housing (1101).

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