210 MPa gas production wellhead device

Abstract

The invention relates to the technical field of gas production devices, and discloses a 210MPa gas production wellhead device which comprises a tubing head assembly and a gas production tree assembly, the gas production tree assembly comprises a manual gate valve and a hydraulic safety valve, and the hydraulic safety valve is connected with the tubing head assembly through the manual gate valve. At the moment, the fixing block abuts against the inclined face of the trapezoid block, the pressure of natural gas below the valve plate generates upward thrust on the valve plate, when the thrust is transmitted to the valve rod, the thrust makes contact with the inclined face of the trapezoid block, part of the thrust is dispersed to the trapezoid block, and therefore the valve rod is prevented from moving excessively, and meanwhile the inclined face of the trapezoid block plays a guiding role. The fixing block can move in a specific direction when bearing thrust, the trapezoidal block can transmit force to the elastic assembly when being extruded by the fixing block, and the elastic assembly further absorbs the thrust.

Description

Technical Field

[0001] The present invention relates to the technical field of gas production devices, and in particular to a 210MPa gas production wellhead device. Background Art

[0002] The 210MPa gas production wellhead device is a combination of wellhead equipment used in the field of natural gas extraction, which can withstand a pressure of up to 210 MPa. It is a key equipment to ensure the safe and efficient exploitation of high-pressure gas fields. It is mainly composed of casing heads, tubing heads, gas production trees and gate valves.

[0003] One of the main functions of the gate valve is to cut off the natural gas flow. During the gas production process, when the gate valve is closed, its gate plate can fit tightly against the valve seat to form a reliable seal to prevent the high-pressure natural gas from continuing to flow. When the gate valve is closed, the medium pressure under the valve plate will generate an upward thrust on the valve plate. This thrust is transmitted to the valve stem through the connection between the valve plate and the valve stem, causing the valve stem to be subjected to an upward axial force. This is one of the main sources of the axial thrust of the valve stem, especially in the high-pressure natural gas wellhead, where the medium pressure is high and the axial thrust on the valve stem is also relatively large.

[0004] Therefore, in the existing use process, the valve plate is first placed tightly against the valve seat sealing ring to achieve sealing. At this time, the valve stem is subjected to a large axial pushing force. Then the hand wheel is rotated at a certain angle to make the valve plate slightly away from the valve seat, allowing the sealing ring to rebound slightly, thereby weakening the axial pushing force of the valve stem. However, when the deformation ability of the sealing ring deteriorates seriously and loses most of its elasticity, when the valve plate is away from the valve seat, the sealing ring cannot provide sufficient elastic force to fill the small gap between the valve plate and the valve seat, which will lead to insufficient sealing performance and medium leakage, and cannot achieve reliable sealing. What is more serious is that when the valve stem is continuously subjected to the action of axial thrust, this force will be transmitted to the threaded connection part, posing a potential threat to the thread and its meshing state. Based on this, the present invention purposely provides a 210MPa gas wellhead device that can ensure the sealing performance of the gate valve while avoiding the valve stem from being subjected to severe axial pushing force. Summary of the invention

[0005] The purpose of the present invention is to provide a 210MPa gas production wellhead device to solve the technical problems in the prior art in view of the shortcomings of the prior art.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A 210MPa gas production wellhead device, comprising a tubing head assembly and a Christmas tree assembly, wherein the Christmas tree assembly comprises a manual gate valve and a hydraulic safety valve, wherein the hydraulic safety valve is connected to the tubing head assembly via the manual gate valve;

[0008] The manual gate valve is divided into a lower chamber and an upper chamber by a partition, the upper chamber is located above the lower chamber, the lower chamber is connected to the oil pipe head assembly through an inlet pipe, and the lower chamber is connected to the hydraulic safety valve through an outlet pipe. A valve seat assembly is arranged in the lower chamber, a valve plate is arranged in the lower chamber, a valve stem is fixedly connected to the top of the valve plate, the valve stem is arranged through the partition, and the two are slidably connected;

[0009] A fixed block is fixedly installed on the valve stem, the fixed block is located in the upper cavity, an elastic component and a connecting component are arranged in the upper cavity, a fixed plate is fixedly installed in the upper cavity, a trapezoidal block is slidably installed in the fixed plate, the trapezoidal block is connected to the elastic component, and the trapezoidal block hypotenuse is slidably matched with the fixed block;

[0010] A threaded rod is slidably installed in the upper cavity, the bottom end of the threaded rod is connected to the valve stem through a connecting assembly, and a hand wheel is rotatably installed on the top of the manual gate valve, and the hand wheel is threadedly connected to the threaded rod.

[0011] As a further solution of the present invention: the valve seat assembly includes a valve seat body and a sealing ring, the valve seat body is fixedly installed in the lower cavity, the sealing ring is arranged in the valve seat body, the bottom of the valve plate is conical in design, and the diameter of the valve plate increases upward along the axis, and the conical surface of the valve plate abuts against the sealing ring.

[0012] As a further solution of the present invention: the number of the elastic components is two, the two elastic components are symmetrically arranged about the fixed block, the elastic components include a spring, a movable plate and an electric cylinder, the electric cylinder is fixedly installed on the manual gate valve, the movable plate is fixedly installed on the movable end of the electric cylinder, and the movable plate is connected to the trapezoidal block through a spring.

[0013] As a further solution of the present invention: the elastic component also includes an opening and a limit block, the opening is opened on the fixed plate, the limit block is slidably installed in the opening, and the limit block is fixedly connected to the trapezoidal block.

[0014] As a further solution of the present invention: the connecting assembly includes an open box, a slide groove, an upper cover plate, a protrusion and an eccentric wheel, the open box is fixedly connected to the top end of the valve stem, the upper cover plate is sleeved on the top end of the open box, and the upper cover plate is fixedly connected to the threaded rod, the eccentric wheel is rotatably installed in the open box, and the eccentric wheel is driven to rotate by a driving source, the eccentric wheel abuts against the upper cover plate, the slide groove is opened on the outer wall of the open box, the protrusion is slidably installed in the slide groove, and the protrusion is fixedly connected to the upper cover plate.

[0015] As a further solution of the present invention: a guide plate is arranged in the upper cavity, the top end of the guide plate is fixedly connected to the top plate of the manual gate valve, the bottom end of the guide plate is fixedly connected to the partition plate, and the fixed block and the upper cover plate are both slidably connected to the guide plate.

[0016] As a further solution of the present invention: the tubing head assembly includes a tubing head body and a grease injection valve installed thereon, the tubing head body is connected to the inlet pipe, and a tubing hanger assembly is installed inside the tubing head body, and a first instrument flange and a first stop valve are connected to the tubing head body.

[0017] As a further solution of the present invention: the Christmas tree assembly includes a four-way valve, a second instrument flange and a second stop valve, the four-way valve is connected to the hydraulic safety valve, and the second instrument flange and the second stop valve are connected to the four-way valve.

[0018] Beneficial effects of the present invention:

[0019] 1. In the present invention, a trapezoidal block is provided to cooperate with a fixed block. When the valve plate and the valve seat assembly are fitted, the manual gate valve channel is cut off. At this time, the fixed block abuts against the inclined surface of the trapezoidal block, and the pressure of the natural gas under the valve plate generates an upward thrust on the valve plate. When the thrust is transmitted to the valve stem, it will contact the inclined surface of the trapezoidal block and disperse part of the thrust to the trapezoidal block, thereby preventing the valve stem from excessive movement. At the same time, the inclined surface of the trapezoidal block also plays a guiding role, so that the fixed block can move in a specific direction when subjected to thrust, and the trapezoidal block will transmit force to the elastic component when squeezed by the fixed block, so that the elastic component further absorbs the thrust, thereby avoiding the problem of subsequent natural gas leakage caused by reducing the thrust by moving the valve plate away from the valve seat assembly;

[0020] 2. In the present invention, the conical design of the bottom of the valve plate provides more path options for force transmission. The pressure can be transmitted not only vertically upward, but also dispersedly transmitted along the oblique direction of the cone surface. This multi-directional force transmission method enables the force acting on the valve plate to be more effectively dispersed to the surrounding structure, reducing the situation of excessive local force, thereby reducing the force directly transmitted to the valve stem;

[0021] 3. In the present invention, when the passage of the manual gate valve is cut off, the valve plate is subjected to an upward thrust, and the thrust will be transmitted to the valve stem. At this time, the fixed block will disperse part of the force, and at the same time, the driving source drives the eccentric wheel away from the upper cover plate. In this way, when the valve stem is subjected to excessive axial force, the valve stem will move slightly upward, thereby squeezing the trapezoidal block, and the open box will also be displaced synchronously, but the positions of the threaded rod and the upper cover plate will not change, which means that the axial force will not be transmitted to the threaded rod, and thus will not act on the threaded connection between the threaded rod and the handwheel, thereby protecting the stability of the lifting mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the manual gate valve in the present invention;

[0025] Figure 3 It is a schematic structural diagram of a cross-section of a manual gate valve in the present invention;

[0026] Figure 4 It is a structural schematic diagram of the fixing plate in the present invention;

[0027] Figure 5 It is a schematic diagram of the structure in which the fixed block abuts against the trapezoidal block in the present invention;

[0028] Figure 6 It is a schematic structural diagram of the open box in the present invention;

[0029] Figure 7 It is a structural schematic diagram of the trapezoidal block in the present invention.

[0030] In the figure: 1, tubing head assembly; 2, gas tree assembly; 3, manual gate valve; 301, partition; 302, lower chamber; 303, upper chamber; 4, hydraulic safety valve; 5, inlet pipe; 6, outlet pipe; 7, valve seat body; 8, sealing ring; 9, valve plate; 10, valve stem; 1001, fixed block; 1002, open box; 11, connecting assembly; 12, threaded rod; 13, hand wheel; 14, fixed plate; 1401, open Mouth; 15, trapezoidal block; 1501, limit block; 16, spring; 17, movable plate; 18, electric cylinder; 19, guide plate; 20, slide groove; 21, upper cover plate; 22, bump; 23, eccentric wheel; 24, tubing head body; 25, grease injection valve; 26, tubing hanger assembly; 27, first instrument flange; 28, first stop valve; 29, cross; 30, second instrument flange; 31, second stop valve. DETAILED DESCRIPTION

[0031] 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.

[0032] See also Figure 1-Figure 7 As shown, the present invention is a 210MPa gas production wellhead device, which includes a tubing head assembly 1 and a Christmas tree assembly 2, wherein the Christmas tree assembly 2 includes a manual gate valve 3 and a hydraulic safety valve 4, and the hydraulic safety valve 4 is connected to the tubing head assembly 1 through the manual gate valve 3;

[0033] The manual gate valve 3 is divided into a lower chamber 302 and an upper chamber 303 by a partition 301. The upper chamber 303 is located above the lower chamber 302. The lower chamber 302 is connected to the oil pipe head assembly 1 through an inlet pipe 5. The lower chamber 302 is connected to the hydraulic safety valve 4 through an outlet pipe 6. A valve seat assembly is arranged in the lower chamber 302. A valve plate 9 is arranged in the lower chamber 302. A valve stem 10 is fixedly connected to the top of the valve plate 9. The valve stem 10 is arranged through the partition 301, and the two are slidably connected.

[0034] A fixing block 1001 is fixedly installed on the valve stem 10, and the fixing block 1001 is located in the upper cavity 303. An elastic component and a connecting component 11 are arranged in the upper cavity 303. A fixing plate 14 is fixedly installed in the upper cavity 303, and a trapezoidal block 15 is slidably installed in the fixing plate 14. The trapezoidal block 15 is connected to the elastic component, and the hypotenuse of the trapezoidal block 15 is slidably matched with the fixing block 1001;

[0035] A threaded rod 12 is slidably installed in the upper cavity 303 , and the bottom end of the threaded rod 12 is connected to the valve stem 10 through a connecting assembly 11 . A hand wheel 13 is rotatably installed on the top of the manual gate valve 3 , and the hand wheel 13 is threadedly connected to the threaded rod 12 .

[0036] The working principle of the present invention is as follows: when the hand wheel 13 is manually rotated to raise the threaded rod 12, so that the valve plate 9 is away from the valve seat assembly, the manual gate valve 3 is in a fully open state, and natural gas can flow through the manual gate valve 3. When it is necessary to cut off the flow channel of the manual gate valve 3, the hand wheel 13 is manually rotated in the opposite direction to lower the threaded rod 12, and the threaded rod 12 drives the valve stem 10 to drop synchronously through the connecting assembly 11. Finally, the valve stem 10 drives the valve plate 9 to drop, so that the valve plate 9 cooperates with the valve seat assembly, thereby cutting off the channel of the manual gate valve 3.

[0037] The fixed block 1001 is fixedly mounted on the valve stem 10, so it will rise and fall synchronously with the valve stem 10. When the fixed block 1001 rises and falls, it will be blocked by the trapezoidal block 15. The fixed block 1001 will abut against the hypotenuse of the trapezoidal block 15 and squeeze the trapezoidal block 15 to make it slide into the fixed plate 14 until the fixed block 1001 can pass through the gap between the two trapezoidal blocks 15.

[0038] like Figure 4 and Figure 5As shown in the figure, in this state, the valve plate 9 and the valve seat assembly cooperate to cut off the channel of the manual gate valve 3. At this time, the fixed block 1001 abuts against the inclined surface of the trapezoidal block 15, and the pressure of the natural gas under the valve plate 9 generates an upward thrust on the valve plate 9. When the thrust is transmitted to the valve stem 10, the valve stem 10 will try to move upward in response to the action of this force. However, this movement trend is not unobstructed, that is, the inclined surface of the fixed block 1001 abuts against the inclined surface of the trapezoidal block 15. This design plays a role in dispersing force. Specifically, when the fixed block 1001 is subjected to the thrust, it will come into contact with the inclined surface of the trapezoidal block 15 and disperse part of the thrust to the trapezoidal block 15. The fixed block 1001 is on the block 15, thereby preventing the valve stem 10 from excessive movement. At the same time, the inclined surface of the trapezoidal block 15 also plays a guiding role, so that the fixed block 1001 can move in a specific direction when subjected to thrust, thereby further enhancing the stability and reliability of the entire system. When the trapezoidal block 15 is squeezed by the fixed block 1001, the force will be transmitted to the elastic component, allowing the elastic component to further absorb the thrust and reset the trapezoidal block 15 in time when the thrust decreases, thereby always limiting the fixed block 1001 at the lowest horizontal position, that is, the valve plate 9 is always closely matched with the valve seat assembly, avoiding the problem of natural gas leakage caused by the valve plate 9 being away from the valve seat assembly.

[0039] like Figure 1-Figure 4 As shown, as a preferred embodiment of the present invention, the valve seat assembly includes a valve seat body 7 and a sealing ring 8, the valve seat body 7 is fixedly installed in the lower cavity 302, the sealing ring 8 is arranged in the valve seat body 7, the bottom of the valve plate 9 is conical in design, and the diameter of the valve plate 9 increases upward along the axis, and the conical surface of the valve plate 9 abuts against the sealing ring 8.

[0040] In practical application, if Figure 3 As shown in the figure, natural gas enters from the inlet pipe 5, then passes through the channel in the middle of the valve seat body 7 in the lower chamber 302, flows from bottom to top, and finally flows out from the outlet pipe 6. When the valve plate 9 descends and abuts the sealing ring 8, the sealing ring 8 is deformed to achieve a sealing effect. At this time, the pressure of the natural gas under the valve plate 9 will generate a thrust on the valve plate 9, and the conical design at the bottom of the valve plate 9 provides more path options for force transmission. The pressure can not only be transmitted upward in the vertical direction, but also be dispersed and transmitted along the oblique direction of the cone surface. This multi-directional force transmission method enables the force acting on the valve plate 9 to be more effectively dispersed to the surrounding structure, reducing the situation of excessive local force, thereby reducing the force directly transmitted to the valve stem 10.

[0041] like Figure 1-Figure 5As shown, as a preferred embodiment of the present invention, the number of the elastic components is two, and the two elastic components are symmetrically arranged about the fixed block 1001. The elastic components include a spring 16, a movable plate 17 and an electric cylinder 18. The electric cylinder 18 is fixedly installed on the manual gate valve 3, and the movable plate 17 is fixedly installed on the movable end of the electric cylinder 18. The movable plate 17 is connected to the trapezoidal block 15 through the spring 16.

[0042] In one case of this embodiment, it should be noted that the electric cylinder 18 described in the present invention is a prior art, and the present invention does not improve them. Therefore, there is no need to disclose their specific mechanical structure and circuit structure, which does not affect the integrity of the present invention.

[0043] In actual application of this embodiment, when the fixed block 1001 is lifted or lowered, it will squeeze the trapezoidal block 15, and the trapezoidal block 15 will compress the spring 16 after being squeezed, so that the trapezoidal block 15 can slide in the fixed plate 14, so that the fixed block 1001 can pass through the channel between the two trapezoidal blocks 15, and after the fixed block 1001 is away from the trapezoidal block 15, the elasticity of the spring 16 will make the trapezoidal block 15 return to its original position. Figure 5 As shown, the electric cylinder 18 can be started to push the movable plate 17 toward the fixed plate 14, which can compress the spring 16, so that the trapezoidal block 15 can further limit the displacement of the fixed block 1001. After the spring 16 is compressed, its thrust will act on the trapezoidal block 15, allowing the trapezoidal block 15 to tightly abut against the fixed block 1001, thereby increasing the resistance to the force transmitted from the valve plate 9 to the valve stem 10.

[0044] like Figure 1-Figure 7 As shown, as a preferred embodiment of the present invention, the elastic component also includes an opening 1401 and a limit block 1501, the opening 1401 is opened on the fixed plate 14, the limit block 1501 is slidably installed in the opening 1401, and the limit block 1501 is fixedly connected to the trapezoidal block 15.

[0045] In actual application, the present embodiment limits the movement of the trapezoidal block 15 by setting the opening 1401 and the limit block 1501, ensuring that after the electric cylinder 18 pushes the movable plate 17 close to the fixed plate 14, the spring 16 pushes the trapezoidal block 15 to abut against the fixed plate 14, and the trapezoidal block 15 will not be displaced.

[0046] like Figure 1-Figure 6As shown, as a preferred embodiment of the present invention, the connecting assembly 11 includes an open box 1002, a slide groove 20, an upper cover plate 21, a protrusion 22 and an eccentric wheel 23, the open box 1002 is fixedly connected to the top of the valve stem 10, the upper cover plate 21 is sleeved on the top of the open box 1002, and the upper cover plate 21 is fixedly connected to the threaded rod 12, the eccentric wheel 23 is rotatably installed in the open box 1002, and the eccentric wheel 23 is driven to rotate by a driving source, the eccentric wheel 23 abuts against the upper cover plate 21, the slide groove 20 is opened on the outer wall of the open box 1002, the protrusion 22 is slidably installed in the slide groove 20, and the protrusion 22 is fixedly connected to the upper cover plate 21.

[0047] In one case of this embodiment, the driving source may be a servo motor, a servo motor or other components, or other mechanisms capable of achieving rotational motion, which is not specifically limited in this embodiment.

[0048] In practical application, if Figure 6 As shown in the figure, when the driving source drives the eccentric wheel 23 to rotate so that the eccentric wheel 23 abuts against the upper cover plate 21, the protrusion 22 slides to the end of the slide groove 20 and cannot move. At this time, the upper cover plate 21 and the open box 1002 form a rigid connection. In this way, when the handwheel 13 drives the threaded rod 12 to rise and fall, the rigid connection between the upper cover plate 21 and the open box 1002 can drive the valve stem 10 to move synchronously. When the passage of the manual gate valve 3 is cut off, the valve plate 9 is subjected to an upward thrust, and the thrust is transmitted to the valve stem 10. At this time, The fixed block 1001 will disperse part of the force, and at the same time, the driving source drives the eccentric wheel 23 away from the upper cover plate 21. In this way, when the valve stem 10 is subjected to excessive axial force, the valve stem 10 will move slightly upward, thereby squeezing the trapezoidal block 15, and the open box 1002 will also move synchronously, but the positions of the threaded rod 12 and the upper cover plate 21 will not change, which means that the axial force will not be transmitted to the threaded rod 12, and will not act on the threaded connection between the threaded rod 12 and the handwheel 13, thereby protecting the stability of the lifting mechanism.

[0049] like Figure 1-Figure 5 As shown, as a preferred embodiment of the present invention, a guide plate 19 is provided in the upper cavity 303, the top end of the guide plate 19 is fixedly connected to the top plate of the manual gate valve 3, the bottom end of the guide plate 19 is fixedly connected to the partition 301, and the fixed block 1001 and the upper cover plate 21 are both slidably connected to the guide plate 19.

[0050] In actual application, the present embodiment can guide the lifting and lowering of the fixed block 1001 and the upper cover plate 21 through the setting of the guide plate 19, especially when the fixed block 1001 passes through between the two trapezoidal blocks 15 by squeezing, the guide plate 19 can ensure that the moving trajectory of the fixed block 1001 remains straight. Similarly, when the eccentric wheel 23 abuts against the upper cover plate 21, after the threaded rod 12 and the valve stem 10 are connected by a rigid connection, the lifting and lowering of the upper cover plate 21 on the guide plate 19 can also ensure the smooth lifting and lowering of the valve plate 9.

[0051] like Figure 1 As shown, as a preferred embodiment of the present invention, the tubing head assembly 1 includes a tubing head body 24 and a grease injection valve 25 installed thereon, the tubing head body 24 is connected to the inlet pipe 5, and a tubing hanger assembly 26 is installed inside the tubing head body 24, and a first instrument flange 27 and a first stop valve 28 are connected to the tubing head body 24.

[0052] Specifically, the X-ray tree assembly 2 includes a spool 29 , a second instrument flange 30 and a second stop valve 31 . The spool 29 is connected to the hydraulic safety valve 4 , and the spool 29 is connected to the second instrument flange 30 and the second stop valve 31 .

[0053] It should be noted that various external instruments can be connected through the first instrument flange 27 and the second instrument flange 30, and the gas wellhead device can be switched on and off remotely in real time according to the working conditions. The upper and lower parts of the tubing hanger assembly 26 adopt a multi-stage sealing structure, including a combination of metal seals and elastic seals, which effectively improves the sealing performance of the device and prevents natural gas leakage.

[0054] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A 210MPa gas production wellhead device, characterized by: It comprises a tubing head assembly (1) and a Christmas tree assembly (2), wherein the Christmas tree assembly (2) comprises a manual gate valve (3) and a hydraulic safety valve (4), and the hydraulic safety valve (4) is connected to the tubing head assembly (1) via the manual gate valve (3); The manual gate valve (3) is divided into a lower chamber (302) and an upper chamber (303) by a partition (301), the upper chamber (303) is located above the lower chamber (302), the lower chamber (302) is connected to the oil pipe head assembly (1) through an inlet pipe (5), the lower chamber (302) is connected to the hydraulic safety valve (4) through an outlet pipe (6), a valve seat assembly is arranged in the lower chamber (302), a valve plate (9) is arranged in the lower chamber (302), a valve stem (10) is fixedly connected to the top of the valve plate (9), the valve stem (10) is arranged through the partition (301), and the two are slidably connected; A fixing block (1001) is fixedly installed on the valve stem (10), and the fixing block (1001) is located in the upper chamber (303). An elastic component and a connecting component (11) are arranged in the upper chamber (303). A fixing plate (14) is fixedly installed in the upper chamber (303), and a trapezoidal block (15) is slidably installed in the fixing plate (14). The trapezoidal block (15) is connected to the elastic component, and the hypotenuse of the trapezoidal block (15) is slidably matched with the fixing block (1001); A threaded rod (12) is slidably installed in the upper chamber (303), and the bottom end of the threaded rod (12) is connected to the valve stem (10) through a connecting assembly (11). A hand wheel (13) is rotatably installed on the top of the manual gate valve (3), and the hand wheel (13) is threadedly connected to the threaded rod (12).

2. A 210MPa gas production wellhead device according to claim 1, characterized in that: The valve seat assembly includes a valve seat body (7) and a sealing ring (8), wherein the valve seat body (7) is fixedly installed in the lower cavity (302), and the sealing ring (8) is arranged in the valve seat body (7). The bottom of the valve plate (9) is conical in design, and the diameter of the valve plate (9) increases upward along the axis, and the conical surface of the valve plate (9) abuts against the sealing ring (8).

3. A 210MPa gas production wellhead device according to claim 1, characterized in that: The number of the elastic components is two, and the two elastic components are symmetrically arranged about the fixed block (1001). The elastic components include a spring (16), a movable plate (17) and an electric cylinder (18). The electric cylinder (18) is fixedly installed on the manual gate valve (3), and the movable plate (17) is fixedly installed on the movable end of the electric cylinder (18). The movable plate (17) is connected to the trapezoidal block (15) through the spring (16).

4. A 210MPa gas production wellhead device according to claim 3, characterized in that: The elastic component further comprises an opening (1401) and a limit block (1501), wherein the opening (1401) is provided on the fixed plate (14), the limit block (1501) is slidably installed in the opening (1401), and the limit block (1501) is fixedly connected to the trapezoidal block (15).

5. A 210MPa gas production wellhead device according to claim 1, characterized in that: The connecting assembly (11) comprises an open box (1002), a slide groove (20), an upper cover plate (21), a protrusion (22) and an eccentric wheel (23); the open box (1002) is fixedly connected to the top end of the valve stem (10); the upper cover plate (21) is sleeved on the top end of the open box (1002), and the upper cover plate (21) is fixedly connected to the threaded rod (12); the eccentric wheel (23) is rotatably installed in the open box (1002), and the eccentric wheel (23) is driven to rotate by a driving source, and the eccentric wheel (23) is in contact with the upper cover plate (21); the slide groove (20) is opened on the outer wall of the open box (1002), the protrusion (22) is slidably installed in the slide groove (20), and the protrusion (22) is fixedly connected to the upper cover plate (21).

6. A 210MPa gas production wellhead device according to claim 5, characterized in that: A guide plate (19) is provided in the upper chamber (303); the top end of the guide plate (19) is fixedly connected to the top plate of the manual gate valve (3); the bottom end of the guide plate (19) is fixedly connected to the partition plate (301); and the fixed block (1001) and the upper cover plate (21) are both slidably connected to the guide plate (19).

7. A 210MPa gas production wellhead device according to claim 1, characterized in that: The tubing head assembly (1) comprises a tubing head body (24) and a grease injection valve (25) mounted thereon; the tubing head body (24) is connected to an inlet pipe (5), and a tubing hanger assembly (26) is mounted inside the tubing head body (24); a first instrument flange (27) and a first stop valve (28) are connected to the tubing head body (24).

8. A 210MPa gas production wellhead device according to claim 1, characterized in that: The gas tree assembly (2) comprises a four-way valve (29), a second instrument flange (30) and a second stop valve (31); the four-way valve (29) is connected to the hydraulic safety valve (4); and the second instrument flange (30) and the second stop valve (31) are connected to the four-way valve (29).

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