Full-sealed leakproof oil extraction wellhead

Abstract

The invention relates to the technical field of oil extraction well mouths, and discloses a full-sealed leakproof oil extraction well mouth which comprises a pipe valve, an oil pipe fitting is installed below the pipe valve, the bottom of the oil pipe fitting is connected with a sleeve pipe fitting, and a sealing assembly is arranged on the oil pipe fitting; the sealing assembly comprises a flow channel sealing device, an inflation sealing device and a filtering device. According to the full-sealed leakproof oil extraction wellhead, liquid can be provided through the arranged flow channel sealing device to surround and seal the joints of a Christmas tree, tureen type sealing with the principle similar to that of a pickled Chinese cabbage jar is arranged, absolute sealing of the inner layer and the outer layer is guaranteed, the liquid surrounds the peripheral joints of all components of the pipe valve, and then the liquid is solidified along with the room temperature; the curing sealing layer is generated, integral sealing of oil and gas is achieved, a good sealing effect can be provided for an oil way through the sealing mode, and the situation that the sealing effect is reduced along with limitation of using time is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of oil wellheads, in particular to a fully sealed and leak-proof oil wellhead. Background Art

[0002] As we all know, the problem of oil leakage at the wellhead has long been a concern for people. Oil leakage at the wellhead not only affects the appearance, but also causes environmental and energy waste problems, and also adds a lot of repetitive work to the oil workers. The main reasons for oil leakage at the wellhead are: operation problems, measures problems, management problems, quality problems, formation problems, etc. Once a leak occurs at the oil wellhead, the oil pipeline needs to be cut off immediately to control and reduce the waste of crude oil caused by the leak in time.

[0003] At present, the oil production wellhead adopts multiple control valves for coordinated connection to control the pumping and drainage of the oil circuit. Multiple pipe valves are connected to directly form an oil production tree wellhead device. Multiple valve bodies are connected. First of all, the sealing of the connection is particularly important. If leakage occurs, the safety of oil production cannot be effectively guaranteed. The sealing method of traditional connection mostly adopts sealing gaskets for connection sealing, and multiple sealing methods are used to ensure the sealing effect. However, with the use of rubber gaskets, as the wellhead is continuously used or the service life is longer, the fatigue strength and corrosion of the oil circuit to which the sealing gasket is subjected will inevitably cause damage, thereby causing leakage of the oil production pipeline. Therefore, a fully sealed and leak-proof oil production wellhead is proposed to solve the above-mentioned problems. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the deficiencies of the prior art, the present invention provides a fully sealed and leak-proof oil production wellhead, which solves the problem that the sealing effect of the oil production wellhead in the prior art is too single and the sealing effect is poor.

[0005] (II) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fully sealed and leak-proof oil production wellhead, comprising a pipe valve, an oil pipe fitting is installed below the pipe valve, a casing fitting is connected to the bottom of the oil pipe fitting, a slip-type hanger is arranged inside the casing fitting, and a sealing assembly is arranged on the oil pipe fitting; the sealing assembly comprises a flow channel sealing device, an inflatable sealing device and a filtering device; the flow channel sealing device is used to provide a liquid flow channel to the pipe valve, the oil pipe fitting and the casing fitting to achieve liquid solidification sealing; the inflatable sealing device uses the flow pressure of the pipe valve to provide an extrusion inflatable fastening seal; the filtering device is used to filter the oil during oil production.

[0006] Preferably, the flow channel sealing device includes a hollow sleeve, the hollow sleeve is fixed on the surface of the pipe valve, a flow channel groove is opened inside the pipe valve, a sedimentation groove is opened on the oil pipe fitting, the sedimentation groove is connected with the hollow sleeve through the flow channel groove, a sealing gasket is arranged on the oil pipe fitting, the sealing gasket abuts against the pipe valve, and the sealing gasket is arranged on the outside of the sedimentation groove.

[0007] Preferably, a flow groove is provided on the surface of the oil pipe component, a connecting groove is provided inside the oil pipe component, the flow groove is connected to the sedimentation groove through the connecting groove, a plurality of rubber pads are provided on the surface of the sleeve component, and the plurality of rubber pads are cooperatively connected with the oil pipe component.

[0008] Preferably, an open groove is provided on the top of the sleeve member, the open groove is communicated with the flow groove, a bearing seat is installed inside the tube valve, and a volume groove is arranged above the bearing seat.

[0009] Preferably, a liquid storage tube is provided on the outer surface of the tube valve, the liquid storage tube is connected to a filling tube, a sealing cover is threadedly connected to the filling tube, the liquid storage tube is connected to the hollow sleeve through a branch pipe, and a colored sealing liquid is provided inside the hollow sleeve.

[0010] Preferably, the inflatable sealing device includes an impeller, the top of the impeller is connected to a diaphragm via an extrusion spring, the diaphragm is fixed inside the pipe valve, a movable shaft is fixedly connected at the center of the impeller, a filter plate is mounted on the movable shaft, a piston sleeve is connected to the filter plate via a plurality of support rods, a piston cavity is provided inside the pipe valve, the piston sleeve is slidably connected inside the piston cavity, an air groove is provided inside the pipe valve, one end of the air groove is connected to a hollow rubber pad, and the other end of the air groove is communicated with the piston cavity.

[0011] Preferably, the hollow rubber pad includes a rubber hose, the rubber hose is provided with an inflation terminal, the inflation terminal is connected to the bottom of the air groove, and the rubber hose is clamped at the connection between the pipe valve and the oil pipe fitting.

[0012] Preferably, the filtering device includes a telescopic spring, the top of the telescopic spring is connected to a scraper, the bottom of the telescopic spring is connected to a bearing seat, the surface of the scraper abuts against the bottom of a filter plate, and the filter plate is provided with filter holes.

[0013] Preferably, the bottom of the filter plate is in a conical structure, a long groove is provided on the surface of the movable shaft, and the scraper is slidably connected to the long groove.

[0014] (III) Beneficial effects Compared with the prior art, the present invention provides a fully sealed and leak-proof oil production wellhead, which has the following beneficial effects: 1. The fully sealed and leak-proof oil production wellhead can provide liquid to surround and seal the connection of the oil production tree through the flow channel sealing device. The entire sealing process utilizes the sealing of the liquid to achieve the overall sealing of the oil production tree. The arrangement principle is similar to the lid-bowl seal of the "sauerkraut jar", which ensures the absolute sealing of the inner and outer layers. The liquid is surrounded by the connection around the components of the pipe and valve, and then as the liquid solidifies at room temperature, a solidified sealing layer is generated to avoid leakage of the inner and outer layers. Therefore, in the case of oil leakage, the barrier effect of the liquid solidification can be utilized to achieve the overall sealing of the oil and gas. This sealing method can improve the sealing effect of the oil circuit and will not lead to a decrease in the sealing effect due to the limitation of use time.

[0015] 2. The fully sealed and leak-proof oil production wellhead can utilize the oil passage flowing inside the oil production tree through the inflatable sealing device to push the piston to perform extrusion movement by borrowing the internal flow force, thereby automatically inflating the hollow rubber pad to slightly expand. The expanded hollow rubber pad can ensure a more stable seal of each connector.

[0016] 3. The fully sealed and leak-proof oil wellhead can achieve preliminary filtration of the oil during oil production through the provided filtering device, and utilizes the flow force of the oil to convert it into rotational force, driving the scraper to rotate and automatically clean the bottom of the filter plate, thereby avoiding clogging of the filter plate after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a fully sealed and leak-proof oil production wellhead proposed by the present invention; Figure 2 This is a schematic diagram of the overall bottom cross-sectional structure of a fully sealed and leak-proof oil production wellhead proposed by the present invention; Figure 3 A schematic diagram of a flow channel sealing structure of a fully sealed and leak-proof oil production wellhead proposed by the present invention; Figure 4 This is a schematic diagram of a liquid storage pipe connection structure of a fully sealed and leak-proof oil production wellhead proposed by the present invention; Figure 5 This is a structural schematic diagram of an inflation sealing device and a filtering device for a fully sealed and leak-proof oil production wellhead proposed by the present invention; Figure 6 This is a schematic diagram of a connection structure of a filter plate for a fully sealed and leak-proof oil wellhead proposed by the present invention; Figure 7 The present invention provides a schematic diagram of a hollow rubber pad structure for a fully sealed and leak-proof oil wellhead.

[0018] In the figure: 1. pipe valve; 2. sleeve fittings; 3. oil pipe fittings; 4. sealing assembly; 401. hollow sleeve; 402. flow channel groove; 403. sedimentation groove; 404. connecting groove; 405. circulation groove; 406. opening groove; 407. rubber pad; 408. bearing seat; 409. volume groove; 410. filling pipe; 411. liquid storage pipe; 412. branch pipe; 413. spacer; 414. extrusion spring; 415. impeller; 416. moving shaft; 417. filter plate; 418. piston chamber; 419. support rod; 420. piston sleeve; 421. filter hole; 422. air groove; 423. hollow rubber pad; 424. scraper; 425. telescopic spring; 426. long groove; 4231. rubber hose; 4232. charging terminal; 5. slip type hanger. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-Figure 7 A fully sealed and leak-proof oil production wellhead comprises a pipe valve 1, an oil pipe fitting 3 is arranged and installed below the pipe valve 1, a casing fitting 2 is connected to the bottom of the oil pipe fitting 3, a slip type hanger 5 is arranged inside the casing fitting 2, and a sealing assembly 4 is arranged on the oil pipe fitting 3; the sealing assembly 4 comprises a flow channel sealing device, an inflatable sealing device and a filtering device; the flow channel sealing device is used to provide a liquid flow channel to achieve liquid solidification sealing for the pipe valve 1, the oil pipe fitting 3 and the casing fitting 2; the inflatable sealing device uses the flow pressure of the pipe valve 1 to provide an extrusion inflatable fastening seal; the filtering device is used to filter the oil during oil production.

[0021] It is worth noting that the flow channel sealing device includes a hollow sleeve 401, which is fixed on the surface of the pipe valve 1, a flow channel groove 402 is provided inside the pipe valve 1, a sedimentation groove 403 is provided on the oil pipe member 3, and the sedimentation groove 403 is connected with the hollow sleeve 401 through the flow channel groove 402, and a sealing gasket is provided on the oil pipe member 3, the sealing gasket abuts against the pipe valve 1, and the sealing gasket is arranged on the outside of the sedimentation groove 403. A flow groove 405 is provided on the surface of the oil pipe member 3, and a connecting groove 404 is provided inside the oil pipe member 3, and the flow groove 405 is connected with the sedimentation groove 403 through the connecting groove 404. A plurality of rubber pads 407 are provided on the surface of the sleeve member 2, and the plurality of rubber pads 407 are connected with the oil pipe member 3. An opening groove 406 is provided on the top of the sleeve member 2, and the opening groove 406 is connected with the flow groove 405. A bearing seat 408 is installed inside the pipe valve 1, and a volume groove 409 is provided above the bearing seat 408. The sealing liquid inside the hollow sleeve 401 flows, and the sealing liquid here can be specifically set as a glue liquid that is insoluble in oil. When the glue liquid enters the interior of the hollow sleeve 401, it will flow into the interior of the sedimentation groove 403 through the flow channel groove 402. The sedimentation groove 403 is located at the connection between the pipe valve 1 and the oil pipe fitting 3, similar to the brim of a "pickle jar", for deposition. After that, after surrounding the entire sedimentation groove 403, it will continue to flow to the position of the circulation groove 405 through the setting of the connecting groove 404. Under the same principle, after filling the circulation groove 405, it will continue to flow to the position of the opening groove 406 for filling. When the opening groove 406 is filled, it will not continue to flow, but belong to the bottom flow channel of the liquid. Therefore, the connection positions of the entire pipe valve 1, the sleeve fitting 2 and the oil pipe fitting 3 are all wrapped by the liquid, and the absolute sealing of the inner and outer layers is guaranteed by the liquid wrapping. Then, as the room temperature decreases as a whole, the solidified wax sealing effect of the paraffin solution is guaranteed.

[0022] In this embodiment, a liquid storage pipe 411 is provided on the outer surface of the pipe valve 1, and a filling pipe 410 is connected to the liquid storage pipe 411, and a sealing cap is threadedly connected to the filling pipe 410. The liquid storage pipe 411 is connected to the hollow sleeve 401 through a branch pipe 412, and a colored sealing liquid is provided inside the hollow sleeve 401. The liquid storage pipe 411 can provide a channel for filling the liquid inside. Because the liquid will be consumed with the length of time, in order to avoid consumption, a filling pipe 410 is provided to fill the solution inside. The entire sealing liquid is not limited to paraffin wax, and a relatively viscous glue can also be selected. It only needs to have a certain solidification effect, or it can be in a solid-liquid mixed state to achieve a sealing effect. The sealing principle is similar to the pickling principle of the "pickle jar". The solution is set at the brim, and then the wax seal is solidified to achieve an overall stable seal. Compared with the traditional sealing technology, this technology has a better sealing effect and can achieve connection sealing at multiple nodes of the oil production tree.

[0023] Furthermore, the inflatable sealing device includes an impeller 415, the top of the impeller 415 is connected to a diaphragm 413 through an extrusion spring 414, the diaphragm 413 is fixed inside the pipe valve 1, a movable shaft 416 is fixedly connected to the center of the impeller 415, a filter plate 417 is installed on the movable shaft 416, a piston sleeve 420 is connected to the filter plate 417 through a plurality of support rods 419, a piston chamber 418 is provided inside the pipe valve 1, the piston sleeve 420 is slidably connected inside the piston chamber 418, an air groove 422 is provided inside the pipe valve 1, one end of the air groove 422 is connected to a hollow rubber pad 423, and the other end of the air groove 422 is connected to the piston chamber 418. The hollow rubber pad 423 includes a rubber hose 4231, and an inflatable terminal 4232 is provided on the rubber hose 4231, and the inflatable terminal 4232 is connected to the bottom of the air groove 422, and the rubber hose 4231 is clamped at the connection between the pipe valve 1 and the oil pipe fitting 3. By utilizing the flow of the oil suction process, the filter plate 417 is in the middle position of the flow channel, so the filter plate 417 will be lifted to a certain height, and then the piston sleeve 420 will be driven to rise through multiple support rods 419 to perform piston movement, and then the air flow inside the piston chamber 418 is squeezed and squeezed out from the inside of the air groove 422, and then enters the position of the inflation terminal 4232, and the air pressure will gradually be injected into the inside of the hose 4231, and then the hose 4231 will expand, and the expanded hose 4231 will fit more closely to the connection between the pipe valve 1 and the sleeve 2, so even if the internal oil pumping air pressure is greater, the sealing effect will be tighter due to the effect of expansion.

[0024] Furthermore, the filtering device includes a telescopic spring 425, the top of which is connected to a scraper 424, the bottom of which is connected to a supporting seat 408, the surface of the scraper 424 abuts against the bottom of a filter plate 417, and a filter hole 421 is provided on the filter plate 417. By setting up a filtering device, the oil can be initially filtered when it is extracted. Because the oil flows from bottom to top when it is extracted from the ground, the filter hole 421 is used to perform preliminary filtration in the flow channel of the oil. After that, when the oil flows, it will pass through the impeller 415 and drive the impeller 415 to rotate. The scraper 424 is slidably connected to the movable shaft 416, so when the filter plate 417 moves up, the elastic force of the telescopic spring 425 is used to push the scraper 424 to always abut against the bottom of the filter plate 417. The rotation of the impeller 415 will synchronously drive the rotation of the movable shaft 416, and the movable shaft 416 will synchronously drive the rotation of the scraper 424, thereby controlling the scraper 424 to rotate and clean the impurities attached to the bottom of the filter plate 417, and the cleaned impurities will gradually flow along the inclined surface to the inside of the volume tank 409.

[0025] In addition, the bottom of the filter plate 417 is in a conical structure, and a long groove 426 is provided on the surface of the moving shaft 416, and the scraper 424 is slidably connected to the long groove 426. Through the long groove 426, after the filter plate 417 moves up, the scraper 424 can slide on the long groove 426, and the elastic force of the telescopic spring 425 is used to squeeze and control the scraper 424 to always be at the bottom of the filter plate 417 to form abutment contact.

[0026] Working principle: when the entire oil production tree is in use, the sealing liquid inside the hollow sleeve 401 flows, and the sealing liquid here can be specifically set as a glue liquid that is insoluble in oil. When the glue liquid enters the interior of the hollow sleeve 401, it will flow into the interior of the sedimentation tank 403 through the flow channel groove 402. The sedimentation tank 403 is located at the connection between the pipe valve 1 and the oil pipe fitting 3, similar to the brim of a "pickle jar", for deposition. After being surrounded by the interior of the entire sedimentation tank 403, it will continue to flow to the position of the circulation tank 405 through the setting of the connecting groove 404. Under the same principle, after filling the circulation tank 405, it will continue to flow to the position of the opening groove 406 for filling. When the opening groove 406 is filled, it will not continue to flow, but belong to the bottom flow channel of the liquid. Therefore, the connection positions of the entire pipe valve 1, the sleeve fitting 2 and the oil pipe fitting 3 are all wrapped by liquid, and the liquid wrapping is used to ensure the absolute sealing of the inner and outer layers. In this solution, the sealing liquid is a paraffin solution. In the initial state, the paraffin solution needs to be heated to a liquid state, and then the paraffin solution is injected from the liquid storage tube 411 through the mouth of the filling tube 410, and flows into the hollow sleeve 401 through the branch pipe 412, and then gradually enters the interior of each slot through the above-mentioned flow channel. As the outdoor temperature decreases, the paraffin solution will gradually solidify, forming a "wax seal" process. Therefore, the connectivity of the flow channel is used to achieve a "wax seal" at the overall matching of multiple connectors, thereby achieving absolute sealing of the oil production tree. In addition, the entire device is also provided with an inflatable sealing device. By utilizing the flow of the oil pumping process, the filter plate 417 is in the middle of the flow channel at this time, so the filter plate 417 will be lifted to a certain height, and then the piston sleeve 420 will be driven to rise through multiple support rods 419 to perform piston movement, and then the airflow inside the piston chamber 418 will be squeezed out from the inside of the air groove 422, and then enter the position of the inflatable terminal 4232, and the air pressure will be gradually injected into the inside of the hose 4231, and then the hose 4231 will be expanded, and the expanded hose 4231 will fit more closely to the connection between the pipe valve 1 and the casing 2, so even if the internal oil pumping air pressure is greater, the sealing effect will be tighter due to the expansion effect. The overall sealing performance is further improved, forming the traditional "rubber pad seal", the special "liquid curing wax seal", and finally the "inflatable expansion seal", forming a "triple seal" effect, maximizing the complete sealing effect of the oil wellhead.The entire device is also provided with a filtering device to achieve preliminary filtration of the oil when it is extracted. Because the oil flows from the bottom to the top when it is extracted from the ground, the filter hole 421 is used to perform preliminary filtration in the flow channel of the oil. After that, when the oil flows, it will pass through the impeller 415 and drive the rotation of the impeller 415. The scraper 424 is slidably connected to the movable shaft 416, so when the filter plate 417 moves up, the elastic force of the telescopic spring 425 is used to push the scraper 424 to always abut against the bottom of the filter plate 417, and the rotation of the impeller 415 will synchronously drive the rotation of the movable shaft 416, and the movable shaft 416 will synchronously drive the rotation of the scraper 424, thereby controlling the scraper 424 to rotate and clean the impurities attached to the bottom of the filter plate 417, and the cleaned impurities will gradually flow along the inclined surface to the inside of the volume tank 409 for temporary storage, and will be removed and cleaned during subsequent maintenance and repair.

[0027] If disassembly and maintenance are required, it is only necessary to heat the outside of the Christmas tree to reliquefy the sealing liquid, and then unscrew the bolts at the connection. Each node part of the Christmas tree can use the sealing structure of the technical solution to achieve overall connection and sealing of the oil wellhead.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A fully sealed leak-proof oil wellhead, characterized in that: include A pipe valve (1), wherein an oil pipe member (3) is arranged and installed below the pipe valve (1), a casing member (2) is connected to the bottom of the oil pipe member (3), a slip-type hanger (5) is arranged inside the casing member (2), and a sealing assembly (4) is arranged on the oil pipe member (3); The sealing assembly (4) comprises a flow channel sealing device, an inflation sealing device and a filtering device; The flow channel sealing device is used to provide a liquid flow channel to achieve liquid solidification sealing for the pipe valve (1), the oil pipe component (3) and the casing component (2); The inflatable sealing device utilizes the flow pressure of the pipe valve (1) to provide an extrusion inflatable fastening seal; The filtering device is used for filtering the oil during oil production.

2. A fully sealed and leak-proof oil wellhead according to claim 1, characterized in that: The flow channel sealing device comprises a hollow sleeve (401), the hollow sleeve (401) is fixed on the surface of the pipe valve (1), a flow channel groove (402) is provided inside the pipe valve (1), a sedimentation groove (403) is provided on the oil pipe member (3), the sedimentation groove (403) is connected with the hollow sleeve (401) through the flow channel groove (402), a sealing gasket is provided on the oil pipe member (3), the sealing gasket is in contact with the pipe valve (1), and the sealing gasket is provided on the outside of the sedimentation groove (403).

3. A fully sealed and leak-proof oil production wellhead according to claim 2, characterized in that: A circulation groove (405) is provided on the surface of the oil pipe member (3), a connecting groove (404) is provided inside the oil pipe member (3), and the circulation groove (405) is connected to the sedimentation groove (403) via the connecting groove (404). A plurality of rubber pads (407) are provided on the surface of the sleeve member (2), and the plurality of rubber pads (407) are cooperatively connected to the oil pipe member (3).

4. A fully sealed and leak-proof oil production wellhead according to claim 3, characterized in that: An opening groove (406) is provided at the top of the sleeve member (2), and the opening groove (406) is communicated with the flow groove (405). A bearing seat (408) is installed inside the pipe valve (1), and a volume groove (409) is provided above the bearing seat (408).

5. A fully sealed and leak-proof oil production wellhead according to claim 2, characterized in that: The outer surface of the pipe valve (1) is provided with a liquid storage pipe (411), the liquid storage pipe (411) is connected to a filling pipe (410), a sealing cap is threadedly connected to the filling pipe (410), the liquid storage pipe (411) is connected to the hollow sleeve (401) via a branch pipe (412), and a colored sealing liquid is provided inside the hollow sleeve (401).

6. The fully sealed and leak-proof oil production wellhead according to claim 1, characterized in that: The inflatable sealing device comprises an impeller (415), the top of the impeller (415) is connected to a diaphragm (413) via a compression spring (414), the diaphragm (413) is fixed inside the pipe valve (1), a movable shaft (416) is fixedly connected to the center of the impeller (415), a filter plate (417) is mounted on the movable shaft (416), the filter plate (417) is connected to a piston sleeve (420) via a plurality of support rods (419), a piston chamber (418) is provided inside the pipe valve (1), the piston sleeve (420) is slidably connected inside the piston chamber (418), an air groove (422) is provided inside the pipe valve (1), one end of the air groove (422) is connected to a hollow rubber pad (423), and the other end of the air groove (422) is communicated with the piston chamber (418).

7. A fully sealed and leak-proof oil production wellhead according to claim 6, characterized in that: The hollow rubber pad (423) comprises a rubber hose (4231), and an air charging terminal (4232) is arranged on the rubber hose (4231). The air charging terminal (4232) is connected to the bottom of the air groove (422), and the rubber hose (4231) is clamped at the connection between the pipe valve (1) and the oil pipe member (3).

8. The fully sealed and leak-proof oil production wellhead according to claim 4, characterized in that: The filtering device comprises a telescopic spring (425), the top of the telescopic spring (425) is connected to a scraper (424), the bottom of the telescopic spring (425) is connected to a bearing seat (408), the surface of the scraper (424) abuts against the bottom of a filter plate (417), and a filter hole (421) is provided on the filter plate (417).

9. A fully sealed and leak-proof oil production wellhead according to claim 8, characterized in that: The bottom of the filter plate (417) is in a conical structure, a long groove (426) is provided on the surface of the movable shaft (416), and the scraper (424) is slidably connected to the long groove (426).

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