CCUS wellhead sealing device

Abstract

The utility model discloses a CCUS wellhead sealing device which comprises a first-stage inflation long-acting sealer, and the first-stage inflation long-acting sealer comprises a first-stage sealing box. The upper end of the first-stage sealing box is provided with an inflation pressing seat extending outwards. A first-stage packing is arranged in the first-stage sealing box, the upper end of the first-stage packing extends out of the first-stage sealing box, an inflatable packing is arranged in the inflatable pressing seat, and the inflatable packing surrounds the periphery of the first-stage packing; the outer wall of the first-stage sealing box is connected with an automatic grease injector below the first-stage packing; and a blocking piece is arranged at the upper end of the inflatable pressing seat. After the inflatable packing is inflated, the primary packing in the inflatable packing is fastened from the periphery, and the inflatable packing is good in sealing performance, convenient to replace, low in cost and long in service life; and through the automatic grease injector outside the first-stage sealing box, grease is supplemented into the first-stage sealing box at any time, so that the sealing effect is ensured, the maintenance time is shortened, and the labor intensity is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wellhead sealing, and specifically relates to a CCUS wellhead sealing device. Background Art

[0002] The rod pumping equipment machinery is the main equipment used on site. During the production process, in order to prevent the leakage of oil, gas, and water in the oil well when the polished rod of the pumping unit moves up and down, a sealing device needs to be installed to seal the oil, gas, and water in the oil well, preventing oil and gas pollution of the wellhead and causing waste. The following reasons will cause the packing to wear and the wellhead seal to fail frequently: ⑴ Due to the well deviation of the pumping well or the installation deviation of the wellhead process and the misalignment between the donkey head and the wellhead, the packing box is often eccentrically worn, and in severe cases, the polished rod cannot go down, resulting in oil leakage at the wellhead; ⑵ The packing belongs to a wearing part. After 2-3 days of use, the oil production worker must go to the well to rotate the compression cap to press the packing downwards, otherwise oil leakage will occur again; ⑶ In the later stage of oilfield exploitation, the water content of the crude oil is relatively high, and the water content of many oilfields is more than 90%. This will cause no crude oil to penetrate and lubricate between the polished rod and the packing during the reciprocating movement of the polished rod, and it will be in a dry grinding state for a long time. This will further exacerbate the wear of the packing. Even if the packing is replaced once a week in severely dry grinding wells, oil leakage often occurs and it is difficult to control.

[0003] Publication (Announcement) Number: CN220203857U, a universal deviation-adjusting blowout-preventing polished rod seal. A guide sleeve is connected to the upper end of the upper packing cavity, a packing rotating body is arranged in the inner cavity of the guide sleeve, and a fixed pressing body is installed on the top of the packing rotating body. The packing is continuously pressed by rotating the fixed pressing body.

[0004] This prior art requires workers to rotate the fixed pressing body multiple times and add butter for lubrication multiple times, which is time-consuming and laborious.

[0005] Publication (Announcement) Number: CN110107245B, discloses a blowout-preventing control tool for the wellhead of a pumping unit. By adjusting the spring compression cap, a certain pressure is generated on the internal corrugated spring, and then the compression degree of the upper packing rubber pad is controlled by rotating the handle, so that the corrugated spring generates a relatively constant pressure on the packing rubber pad under a certain compression state. As the packing rubber pad wears, the spring energy of the corrugated spring can gradually release potential energy to maintain the seal under a reasonable pre-tightening force.

[0006] Publication (Announcement) Number: CN216741432U, discloses a CO2 flooding oil production wellhead pumping rod sealing device, which realizes long-term sealing by a conical packing seat and a spring continuously pressing the primary packing.

[0007] The above two prior arts both achieve continuous pressing through springs. When the pressing force applied by the spring becomes smaller, to restore the pressing force, the compression cap can only be screwed in further. When there is no screwing-in amount, only maintenance and replacement can be carried out, and butter lubrication needs to be added multiple times.

[0008] In summary, the technical solutions, the technical problems to be solved, and the beneficial effects of the above-disclosed technologies are all different from those of the present utility model. For more technical features, technical problems to be solved, and beneficial effects of the present utility model, there is no technical inspiration in the above-disclosed technical documents. Content of the Utility Model

[0009] Aiming at the above-mentioned defects existing in the prior art, the purpose of the present utility model is to provide a CCUS wellhead sealing device, which retains the way of screwing in and pressing tightly, but the compression nut can be not screwed in, and the sealing force of the packing is restored by inflating, and an automatic greasing device is provided to reduce the number of times of butter filling.

[0010] In order to achieve the above purpose, the present utility model adopts the following technical solutions:

[0011] A CCUS wellhead sealing device includes a first-stage inflatable long-term seal, and the first-stage inflatable long-term seal includes a first-stage seal box; an inflation pressing seat extending outward is arranged at the upper end of the first-stage seal box; a first-stage packing is arranged in the first-stage seal box, the upper end of the first-stage packing extends out of the first-stage seal box, an inflation packing is arranged in the inflation pressing seat, and the inflation packing surrounds the first-stage packing; an automatic greasing device is connected to the outer wall of the first-stage seal box below the first-stage packing; a sealing member is arranged at the upper end of the inflation pressing seat.

[0012] Further, the automatic greasing device includes an inner oil guiding and oil scraping mechanism and an automatic oil replenishing mechanism;

[0013] Specifically, a first retaining ring is arranged on the inner wall of the first-stage seal box, the inner oil guiding and oil scraping mechanism is arranged above the first retaining ring, and the first-stage packing is arranged above the inner oil guiding and oil scraping mechanism;

[0014] Specifically, the sealing member includes a gland and a first compression nut;

[0015] Specifically, the upper end surfaces of the inflation packing and the first-stage packing are flush, a gland is arranged at the top of the inflation packing and the first-stage packing, the gland is provided with an air injection channel, and the air injection hole of the inflation packing extends through the air injection channel of the gland to the top of the gland;

[0016] Specifically, the upper end of the inflation pressing seat is threadedly connected to the first compression nut, and the first compression nut presses downward to fix the gland, and the first compression nut does not block the air injection channel.

[0017] Further, the inner wall of the inflation pressing seat is a conical space.

[0018] Further, the upper end surface of the gland is flush with the upper end surface of the first compression nut.

[0019] Further, the inner oil guiding and scraping mechanism includes an oil scraping ring, a raised packing, and an oil storage ring arranged in sequence from bottom to top. The oil storage ring is provided with a radial oil guiding through hole, and an annular concave cavity is arranged on the inner wall of the oil storage ring. The automatic oil replenishing mechanism is communicated with the oil guiding through hole;

[0020] Specifically, the automatic oil replenishing mechanism includes an oil replenishing housing. A leather cup is arranged inside the oil replenishing housing. The leather cup divides the inside of the oil replenishing housing into an oil cavity and an energy storage cavity. A check valve is connected to the front end of the oil cavity of the oil replenishing housing. A spring is arranged in the energy storage cavity. A pull rod is arranged outside the oil replenishing housing. The pull rod is inserted into the oil replenishing housing, passes through the energy storage cavity and is fixedly connected with the leather cup;

[0021] Specifically, the check valve is connected to the outer wall of the first-stage seal box and inserted into the outer wall of the first-stage seal box to be communicated with the oil guiding through hole of the oil storage ring. An extrusion ball is arranged at the end of the check valve inside the oil replenishing housing, and a compression spring is arranged at the end of the check valve inside the first-stage seal box.

[0022] Further, the spring and the compression spring are always in a compressed state, and the elastic force of the spring is always greater than the elastic force of the compression spring.

[0023] Further, a second-stage seal is further included. The second-stage seal includes a second-stage seal box, and a second retaining ring is arranged on the inner wall of the second-stage seal box;

[0024] Specifically, a second-stage packing is arranged above the second retaining ring. A pressure ring is arranged on the second-stage packing. The upper end of the second-stage seal box is threadedly connected with a second pressing cap. The second pressing cap presses the pressure ring against the second-stage packing. The upper end of the second pressing cap is fixedly connected with the lower end of the first-stage seal box.

[0025] Further, a gate seal is further included. The gate seal includes a four-way joint. The upper through pipe of the four-way joint is the second-stage seal box;

[0026] Specifically, screw-type linear propulsion mechanisms are arranged in both the left through pipe and the right through pipe of the four-way joint. A rubber gate is arranged in the four-way joint by the screw-type linear propulsion mechanisms.

[0027] Further, a translational deviation adjusting device is further included. The translational deviation adjusting device includes a joint and a deviation adjusting device gland. A pressure-receiving ring is arranged on the outer wall of the lower end of the lower through pipe of the four-way joint. The deviation adjusting device gland is sleeved on the outer wall of the lower through pipe of the four-way joint. The deviation adjusting device gland is threadedly connected with the outer wall of the upper end of the joint to press the pressure-receiving ring against the joint.

[0028] Further, the inflated packing is a polyamide inflated ring; the first-stage packing is a fluororubber packing; the second-stage packing is an aramid packing; the rubber gate is a polytetrafluoroethylene rubber gate.

[0029] The utility model has the following beneficial effects compared with the prior art:

[0030] 1. In the present utility model, after inflation, the inflatable packing tightens the internal primary packing from all around, featuring good sealing performance, convenient replacement, low cost, and long service life. The grease storage ring stores grease to eliminate the dry grinding phenomenon between the polished rod and the packing. The planar displacement alignment device is adopted, with a large adjustment range, uniform stress, and good sealing performance. Through the automatic greasing device outside the primary sealing box, grease can be replenished into the grease storage ring at any time, ensuring the sealing effect, reducing the maintenance time, and lowering the labor intensity.

[0031] 2. In the present utility model, the inflatable packing adopts a polyamide inflatable ring, which has high strength and can be inflated multiple times. The primary packing adopts a fluororubber packing, with a service life of up to two years. The secondary packing adopts an aramid packing, which is resistant to high pressure and has good sealing performance. The rubber gate adopts a polytetrafluoroethylene rubber gate, which is resistant to high pressure and has strong reliability.

[0032] 3. In the present utility model, the oil scraping ring removes the stubborn viscous oil and wax adhering to the polished rod before the crude oil enters the sealing cavity, reducing the burden on the packing, enabling the device to be used in viscous oil and high-wax wells; the automatic lubrication device provides lubrication at any time, improving the sealing effect, extending the service life of the packing, and enabling the device to be used in high-water-cut and low-liquid-production wells.

[0033] 4. In the present utility model, the primary and secondary packings and the rubber gate can all withstand a pressure of 35 Mpa, belonging to a safety backup configuration, which can remove the double-valve blowout preventer at the wellhead, reducing the cost investment and being more conducive to daily operation. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of a CCUS wellhead sealing device of the present utility model;

[0035] Figure 2 is a cross-sectional view of the position of the grease storage ring in the present utility model;

[0036] Figure 3 is a cross-sectional view of the position of the translational alignment device in the present utility model;

[0037] Figure 4 is a specific schematic diagram of the automatic greasing device in the present utility model;

[0038] Figure 5 is a specific schematic diagram of the grease storage ring in the present utility model.

[0039] In the figure: 1. Gland; 2. Inflatable packing; 3. Grease storage ring; 4. Compression spring; 5. Pull rod; 6. Spring; 7. Oil replenishment housing; 8. Check valve; 9. Extrusion ball; 10. First compression cap; 11. Connector; 12. Alignment device gland; 13. Polished rod; 14. Gate seal; 15. Secondary packing; 16. Second compression cap; 17. Pressure ring; 18. Oil scraping ring; 19. Primary packing; 20. Leather cup. Detailed implementation mode

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment 1:

[0042] Please refer to Figures 1 to 5 , a CCUS wellhead sealing device provided by the present invention includes a first-stage inflation long-term seal, a second-stage seal, a gate seal 14, and a translational deviation adjustment device connected in sequence from top to bottom. The first-stage inflation long-term seal is provided with an automatic grease injector.

[0043] The first-stage inflation long-term seal includes a first-stage seal box. The first-stage seal box is a straight pipe section. An inflation and compression seat extending outward is provided at the upper end of the first-stage seal box. A first retaining ring is provided on the inner wall of the first-stage seal box. The automatic grease injector includes an inner oil guiding and oil scraping mechanism and an automatic oil replenishing mechanism. The inner oil guiding and oil scraping mechanism is arranged on the first retaining ring. A first packing 19 is arranged above the inner oil guiding and oil scraping mechanism. The lower end of the first packing 19 is in the first-stage seal box, and the upper end extends out of the first-stage seal box. An inflation packing 2 is arranged in the inflation and compression seat. The inflation packing 2 surrounds the periphery of the first packing 19. The upper end faces of the inflation packing 2 and the first packing 19 are flush. A gland 1 is arranged at the top of the inflation packing 2 and the first packing 19. The gland 1 is provided with an air injection channel. The air injection hole of the inflation packing 2 penetrates through the air injection channel of the gland 1 and extends to the top of the gland 1. A first compression cap 10 is threadedly connected to the upper end of the inflation and compression seat. The first compression cap 10 presses downward to fix the gland 1. The first compression cap 10 does not block the air injection channel.

[0044] Among them, the inner wall of the inflation and compression seat is a conical space.

[0045] Among them, the upper end face of the gland 1 is flush with the upper end face of the first compression cap 10, which does not affect operations such as pump bumping. The gland 1 is of a two-piece type, which is convenient for installation and removal.

[0046] Among them, the inflation packing 2 is a polyamide inflation ring. The polyamide inflation ring has high strength and wear resistance and can be inflated multiple times.

[0047] Among them, the first packing 19 is a fluororubber packing. The first packing 19 is composed of three groups of fluororubber packing units. The service life of the fluororubber packing can reach two years, and the maintenance of the first-stage inflation long-term seal can be completed at the well site, which not only ensures the sealing effect but also reduces the labor intensity.

[0048] The secondary seal includes a secondary seal box which is a straight pipe section. A second retaining ring is provided on the inner wall of the secondary seal box. A secondary packing 15 is provided on the second retaining ring. A pressing ring 17 is provided on the secondary packing 15. The upper end of the secondary seal box is threadedly connected with a second compression cap 16. The second compression cap 16 presses the pressing ring 17 against the secondary packing 15. The upper end of the second compression cap 16 is fixedly connected to the lower end of the primary seal box, such as by welding.

[0049] Among them, the secondary packing 15 is aramid packing, and the secondary packing 15 is composed of three groups of aramid packing units.

[0050] The gate seal 14 includes a cross. The upper through pipe of the cross is the secondary seal box. Screw-type linear propulsion mechanisms are provided in both the left through pipe and the right through pipe of the cross. The screw-type linear propulsion mechanism is provided with a rubber gate in the cross for sealing the polished rod. No improvement is made to the screw-type linear propulsion mechanism in the gate seal 14 of the present utility model. The screw-type linear propulsion mechanism may be the lead screw and the gate shaft in the CN210622755U SAGD oil well double-stage polished rod sealing device.

[0051] Among them, the rubber gate adopts a polytetrafluoroethylene rubber gate, which has high pressure resistance. Moreover, the rubber gate itself has a large sealing area and good sealing performance. It adopts an integral seal, has high wear resistance, and reliable performance.

[0052] The translational alignment adjustment device includes a joint 11 and an alignment adjustment device gland 12. A pressure-receiving ring is provided on the outer wall of the lower end of the lower through pipe of the cross. The alignment adjustment device gland 12 is sleeved on the outer wall of the lower through pipe of the cross. The alignment adjustment device gland 12 is threadedly connected to the outer wall of the upper end of the joint 11 to press and fix the pressure-receiving ring to the cross. When installing the alignment adjustment device gland 12, first sleeve the alignment adjustment device gland 12 on the outer wall of the lower through pipe of the cross, and then weld the pressure-receiving ring.

[0053] Embodiment 2:

[0054] Based on Embodiment 1, the specific structure of the automatic greasing device is provided in this embodiment, as Figure 2 、 Figure 4 shown.

[0055] The inner oil-guiding and oil-scraping mechanism includes an oil-scraping ring 18, a spacer packing, and an oil storage ring 3 arranged in sequence from bottom to top. The oil storage ring 3 is provided with a radial oil-guiding through hole. A concave ring cavity is provided on the inner wall of the oil storage ring 3. The automatic oil replenishment mechanism is communicated with the oil-guiding through hole and then with the internal cavity of the oil storage ring 3.

[0056] Among them, the spacer packing plays an oil-scraping role in the initial stage of use. After wear, the butter fills the worn cavity, playing a role in increasing the contact area of the butter.

[0057] Among them, the oil scraping ring 18 plays an oil scraping role, reducing the butter loss rate and preventing crude oil from entering the primary seal box.

[0058] The automatic oil replenishing mechanism includes an oil replenishing housing 7. A leather cup 20 is arranged inside the oil replenishing housing 7. The leather cup 20 divides the inside of the oil replenishing housing 7 into an oil cavity and an energy storage cavity. The oil replenishing housing 7 is connected to a check valve 8 at the front end of the oil cavity. The check valve 8 is connected to the outer wall of the primary seal box and inserted into the oil guiding through hole of the oil storage ring 3 communicated with the outer wall of the primary seal box. An extrusion ball 9 is arranged at the end of the check valve 8 connected to the oil replenishing housing 7, and a compression spring 6 is arranged at the end connected to the primary seal box. A spring 6 is arranged in the energy storage cavity. A pull rod 5 is arranged outside the oil replenishing housing 7. The pull rod 5 is inserted into the oil replenishing housing 7, passes through the energy storage cavity and is fixedly connected to the leather cup 20, such as by a threaded hole and a threaded head connection.

[0059] Among them, the check valve 8 prevents the oil in the oil storage ring 3 from overflowing.

[0060] Among them, a sealing ring is arranged between the leather cup 20 and the inner wall of the oil replenishing housing 7.

[0061] Among them, the spring 6 and the compression spring 4 are always in a compressed state, and the elastic force of the spring 6 is always greater than that of the compression spring 4, so that the spring 6 replenishes butter into the oil storage ring 3 in real time until the leather cup 20 contacts the check valve 8.

[0062] Among them, the oil replenishing housing 7 is provided in two sections. After the leather cup 20 is installed and the pull rod 5 is set, the two sections of the oil replenishing housing 7 are connected together by threads.

[0063] Embodiment 3:

[0064] Based on Embodiment 2, this embodiment provides a method for using a CCUS wellhead sealing device, which specifically includes the following steps:

[0065] S1. Connect the primary inflatable long-term seal, the secondary seal, the gate seal 14, the translational alignment device, the inner oil guiding and oil scraping mechanism, and the check valve 8;

[0066] When connecting, the oil storage ring 3 is filled with initial butter. When connecting the first compression cap 10, part of the thread is reserved to provide space for subsequent adjustment of pressing the primary packing tightly. After connection, connect the joint 11 to the wellhead, lower the polished rod 13 so that the polished rod 13 is above the rubber gate, and inflate and pressurize the inflatable packing 2.

[0067] S2. Pull the pull rod 5 to the maximum energy storage position, fill the oil chamber inside the oil replenishing housing 7 with spare butter, thread the oil replenishing housing 7 and the check valve 8, and the leather cup 20 continuously applies pressure through the spring 6. When the butter in the internal space of the oil storage ring 3 is missing, the butter can be continuously supplemented through the check valve 8 without manual addition, thereby achieving an automatic and continuous lubrication effect.

[0068] S3. If there is misalignment and eccentric wear at the wellhead, it can be corrected by the lower translational adjustment device. When the translational adjustment device is in use, the adjustment device cover 12 is rotated in the opposite direction to move it upward through the thread. At this time, the inside of the adjustment device cover 12 releases the extrusion of the pressure ring at the lower end of the four-way down pipe, and leveling is achieved through the position of the lower end of the four-way down pipe relative to the joint 11. After the four-way is adjusted, the adjustment device cover 12 is rotated forward to move it downward to squeeze and fix the pressure ring at the lower end of the four-way down pipe and the joint 11, thereby solving the eccentric wear of the sucker rod and the sealing device.

[0069] S4. The polished rod 13 is completely lowered, and the rubber gate is supported on the outer wall of the polished rod 13 by the screw-type linear propulsion mechanism. The polished rod 13 reciprocates up and down, and the inner wall surface of the oil scraper ring 18 fits tightly with the polished rod 13. The oil scraper ring 18 can remove the crude oil attached to the polished rod 13, reducing most of the burden on the primary packing 19.

[0070] S5. After the primary packing 19 is worn, the inflatable packing presses the primary packing 19 against the outer wall of the polished rod 13, and the internal pressure is continuously reduced. During normal maintenance, it is only necessary to inflate with an air pump to restore the pressure in the inflatable packing 2;

[0071] When the rubber gate and the secondary packing 15 are completely ineffective, the sealing effect of the primary packing can be strengthened by inflating and rotating the first pressure cap 10.

[0072] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0073] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0074] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0075] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0076] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A CCUS wellhead sealing device, characterized in that: It includes a primary inflatable long-term sealer, and the primary inflatable long-term sealer includes a primary sealing box; The upper end of the primary sealing box is provided with an inflatable compression seat extending outward; A primary packing is arranged in the primary sealing box, the upper end of the primary packing extends out of the primary sealing box, and an inflatable packing is arranged in the inflatable pressing seat, and the inflatable packing surrounds the primary packing; The outer wall of the primary sealing box is connected to an automatic grease injector below the primary packing; A sealing member is arranged at the upper end of the inflation and compression seat.

2. A CCUS wellhead sealing device according to claim 1, characterized in that: The automatic grease injector comprises an internal oil guide and scraper mechanism and an automatic oil replenishing mechanism; The inner wall of the primary sealing box is provided with a first baffle ring, the inner oil guide and scraper mechanism is provided at the upper end of the first baffle ring, and the primary packing is provided at the upper end of the inner oil guide and scraper mechanism; The sealing member includes a gland and a first pressure cap; The upper end surfaces of the pneumatic packing and the first-level packing are flush, and a gland is arranged on the top of the pneumatic packing and the first-level packing. The gland is provided with an air-injection channel, and the air-injection hole of the pneumatic packing passes through the air-injection channel of the gland and extends to the top of the gland; The upper end of the inflation pressing seat is threadedly connected to the first pressure cap, and the first pressure cap squeezes downward to fix the gland, and the first pressure cap does not block the inflation channel.

3. A CCUS wellhead sealing device according to claim 2, characterized in that: The inner wall of the inflatable compression seat is a conical space.

4. A CCUS wellhead sealing device according to claim 2, characterized in that: The upper end surface of the gland is flush with the upper end surface of the first pressure cap.

5. A CCUS wellhead sealing device according to claim 2, characterized in that: The inner oil guide and scraper mechanism comprises an oil scraper ring, a packing and an oil storage ring which are arranged in sequence from bottom to top. The oil storage ring is provided with a radial oil guide through hole. The inner wall of the oil storage ring is provided with a concave ring cavity. The automatic oil replenishing mechanism is connected with the oil guide through hole. The automatic oil replenishing mechanism comprises an oil replenishing housing, a leather cup is arranged in the oil replenishing housing, the leather cup divides the oil replenishing housing into an oil chamber and an energy storage chamber, the oil replenishing housing is connected to a check valve at the front end of the oil chamber, a spring is arranged in the energy storage chamber, a pull rod is arranged outside the oil replenishing housing, the pull rod is inserted into the oil replenishing housing, passes through the energy storage chamber and is fixedly connected to the leather cup; The one-flow valve is connected to the outer wall of the primary sealing box and inserted into the outer wall of the primary sealing box to communicate with the oil guide hole of the oil storage ring. A squeezing ball is arranged at the end of the oil replenishing housing in the one-flow valve and a compression spring is arranged at the end of the primary sealing box.

6. A CCUS wellhead sealing device according to claim 5, characterized in that: The spring and the compression spring are always in a compressed state, and the spring force is always greater than the compression spring force.

7. A CCUS wellhead sealing device according to any one of claims 1 to 6, characterized in that: It also includes a secondary sealer, the secondary sealer includes a secondary sealing box, and the inner wall of the secondary sealing box is provided with a second retaining ring; A secondary packing is arranged at the upper end of the second retaining ring, a pressure ring is arranged on the secondary packing, a second pressure cap is threadedly connected to the upper end of the secondary sealing box, the second pressure cap presses the pressure ring onto the secondary packing, and the upper end of the second pressure cap is fixedly connected to the lower end of the primary sealing box.

8. A CCUS wellhead sealing device according to claim 7, characterized in that: It also includes a gate sealer, the gate sealer includes a four-way, and the upper through pipe of the four-way is a secondary sealing box; A screw-type linear propulsion mechanism is arranged in the left and right passages of the four-way rod, and a rubber gate is arranged in the four-way rod.

9. A CCUS wellhead sealing device according to claim 8, characterized in that: It also includes a translational adjustment device, which includes a joint and an adjustment device cover. A pressure ring is provided on the outer wall of the lower end of the down pipe of the four-way, and the adjustment device cover is sleeved on the outer wall of the down pipe of the four-way. The adjustment device cover is threadedly connected to the outer wall of the upper end of the joint to press the pressure ring onto the joint.

10. A CCUS wellhead sealing device according to claim 8, characterized in that: The inflatable packing is a polyamide inflatable ring; the primary packing is a fluororubber packing; the secondary packing is an aramid packing; and the rubber gate is a polytetrafluoroethylene rubber gate.

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