Gas injection and production wellhead device

Abstract

The invention belongs to the technical field of gas well exploitation, and particularly relates to a gas injection and production wellhead device which comprises a power assisting assembly, the power assisting assembly comprises an electric actuator and a transmission case, a rotating shaft of the electric actuator extends into the transmission case, and a hand lever is rotationally installed on the transmission case; a power assisting table is fixedly installed in the transmission box, a ratchet wheel is installed on the hand lever, a hydraulic cavity is formed in the power assisting table, and the hydraulic cavity is communicated with the liquid inlet pipe. If the hand lever rotates in the direction of closing the gate valve, the hydraulic oil is discharged from the liquid discharge pipe, so that rotation assistance is provided for the hand lever, closing of the gate valve is accelerated, and the probability of gas leakage is greatly reduced; if a worker rotates the hand lever in the direction of opening the gate valve, the hand lever drives the ratchet wheel to rotate, at the moment, teeth on the ratchet wheel abut against ratchets, and the situation that the worker opens the gate valve by mistake in an emergency state, the gas leakage range is increased, and accidents are further increased is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of gas well production, and in particular relates to a gas injection and production wellhead device. Background Art

[0002] Gas injection and production wellheads are critical equipment used to control and manage oil, gas, and water wells during oil and gas field development. They primarily consist of Christmas trees, tubing heads, casing heads, valves, and accessories. They are widely used in the development of various oil and gas fields, both onshore and offshore, and in both conventional and specialized wells, such as sulfur-containing, high-pressure, and high-gas-content wells. The appropriate gas injection and production wellhead requires careful selection based on the specific operating conditions.

[0003] Existing valves in gas injection and production wellheads are typically equipped with electric actuators, enabling precise and convenient operation while reducing potential leak points. To enhance valve safety, a hand lever is installed on the valve body. This ensures that in the event of a hydraulic safety valve failure, manual operation of the combination valve ensures final closure of the gas production wellhead, preventing well control accidents.

[0004] When the electric actuator breaks down or fails, the gas pressure collected at the wellhead is high, so the resistance of the hand lever is large, and the time to close the gate valve body will increase accordingly, which is very likely to cause accidents such as gas leakage. Summary of the Invention

[0005] The purpose of the present invention is to provide a gas injection and production wellhead device to address the deficiencies of the prior art and to solve the technical problems in the prior art.

[0006] The purpose of the present invention can be achieved through the following technical solutions: a gas injection and production wellhead device, which includes a four-way pipe, gate valves are respectively installed on the interfaces on both sides of the four-way pipe, a power-assisting component is installed on the gate valve, the gate valve is connected to the throttle valve and the instrument flange, a seismic pressure gauge is installed on the instrument flange, the four-way pipe is connected to the upper flange through a hydraulic safety valve, the upper flange is bolted to the casing head body, a casing hanger assembly is installed in the casing head body, and the two sides of the casing head body are respectively connected to the threaded flange and the square right-angle stop valve through the gate valve; the power-assisting component includes an electric actuator and a transmission box, the transmission box is installed on the electric actuator, the rotating shaft of the electric actuator extends into the transmission box, and a hand lever is rotatably installed on the transmission box; a power-assisting platform is fixedly installed in the transmission box, a ratchet is installed on the hand lever, and the ratchet position A hydraulic chamber is provided in the power-assisting platform, which is connected to a liquid inlet pipe, and a rotating shaft is rotatably installed on the wall of the liquid inlet of the liquid inlet pipe, a sealing cover is installed on one side of the rotating shaft, and a push rod is installed on the other side, and the sealing cover blocks the liquid inlet of the liquid inlet pipe; a ratchet is rotatably installed on the inner wall of the power-assisting platform, and the ratchet is connected to the push rod; a transverse sliding rod is slidably installed on the power-assisting platform, a push block is installed on one side of the transverse sliding rod, and a fixed plate is installed on the other side, and the push block is located inside the hydraulic chamber, an electromagnetic suction cup is installed on the power-assisting platform, and a magnetic metal plate is installed on the fixed plate, and the electromagnetic suction cup attracts the magnetic metal plate; a connecting shaft is fixedly installed on the electric actuator, and the connecting shaft and the hand lever are detachably connected; when the electric actuator is working, the connecting shaft is disconnected from the hand lever, and when the electric actuator stops, the fixed plate is connected to the hand lever.

[0007] As a further optimization or improvement of this solution, a top block is installed on one side of the ratchet, and the top block abuts the ratchet; the ratchet is connected to the inner wall of the power-assisting platform through a spring, a drain pipe is installed on the power-assisting platform, a liquid storage tank is installed at the bottom of the transmission box, and the drain pipe is connected to the liquid storage tank; as the hand lever is closed and rotated in one direction, the ratchet lifts the ratchet, and the push rod is pushed to move by the rotation of the ratchet, thereby driving the rotation of the rotating shaft, and the rotating shaft drives the sealing cover to separate from the liquid inlet of the liquid inlet pipe; when the hand lever is opened and rotated in one direction, the ratchet abuts against the ratchet, and the rotation of the ratchet is suppressed by the top block.

[0008] As a further optimization or improvement of this solution, a transmission sleeve is installed on the back of the ratchet, a transmission groove is opened in the transmission sleeve, and an adapter is installed on the connecting shaft, and the adapter is located inside the transmission sleeve and rotates.

[0009] As a further optimization or improvement of this solution, a transmission block is installed in the adapter for longitudinal sliding, a push plate is installed in the adapter for transverse sliding, a conical block is installed on the push plate, and the conical block abuts the inclined surface on the transmission block; by pushing the push plate and the conical block to move, the conical block pushes the transmission block out of the adapter, so that the adapter cooperates with the transmission groove.

[0010] As a further optimization or improvement of this solution, a bearing is installed on the fixed plate, and the push plate is in contact with the bearing; the conical block is connected to the inner wall of the adapter through spring 2.

[0011] As a further optimization or improvement of this solution, the transmission groove is larger than the transmission block, so that the transmission sleeve rotates a certain distance before cooperating with the transmission block.

[0012] Beneficial effects of the present invention: (1) The present invention drives the ratchet to rotate by a hand lever. As the ratchet rotates, the teeth on the ratchet lift the ratchet teeth, and the ratchet teeth rotate to push the push rod to move, thereby driving the rotating shaft to rotate. The rotating shaft drives the cover to separate from the liquid port of the liquid inlet pipe. At this time, the hydraulic oil in the hydraulic chamber drives the ratchet to rotate, and then the hydraulic oil is discharged from the drain pipe, thereby providing rotation assistance for the hand lever, accelerating the closing of the gate valve, and greatly reducing the probability of gas leakage.

[0013] Specifically, if the hand lever is rotated in the direction of closing the gate valve, the hydraulic oil in the hydraulic chamber will provide steering assistance for the hand lever; if the worker rotates the hand lever in the direction of opening the gate valve, the hand lever drives the ratchet to rotate. At this time, the teeth on the ratchet wheel and the ratchet teeth are against each other, and the rotation of the hand lever in this direction is suppressed by the top block resisting the rotation of the ratchet teeth, thereby preventing workers from accidentally opening the gate valve in an emergency, increasing the scope of gas leakage, and causing further accidents.

[0014] (2) When the hand lever rotates, the ratchet needs to be driven by the hand lever to rotate a certain angle so that the ratchet can open the liquid inlet pipe by acting on the ratchet teeth to achieve hydraulic assistance. During this period of time, closing the gate valve without hydraulic assistance by the hand lever is extremely laborious and time-consuming.

[0015] Based on this, the transmission groove of the present invention is set to be larger than the transmission block. In the process of turning the hand lever to urgently close the gate valve, the hand lever needs to be rotated to a certain angle before the transmission groove can be connected to the transmission block, so that there is a connection delay between the transmission sleeve and the adapter, ensuring that after the liquid inlet pipe is opened to realize hydraulic assistance, the hand lever is connected to the electric actuator to improve the closing efficiency of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the overall structure of the power assist component.

[0019] Figure 3 This is a schematic diagram of the connection structure of the electric actuator, transmission box and hand lever.

[0020] Figure 4 Schematic diagram of the internal structure of the transmission box.

[0021] Figure 5 It is a cross-sectional view of the overall structure of the power assist component.

[0022] Figure 6 for Figure 5 A magnified view of the structure of part B.

[0023] Figure 7 Schematic diagram of the connection structure between the ratchet and the cover.

[0024] Figure 8 for Figure 5 A magnified view of the C-site structure.

[0025] Figure 9 for Figure 5 Cross-sectional view along the dotted line of part A.

[0026] Figure 10 This is a schematic diagram of the connection structure between the ratchet and the power-assisting platform.

[0027] Figure 11 It is a schematic diagram of the transmission sleeve structure.

[0028] Figure 12 This is an exploded diagram of the overall structure of the power assist component.

[0029] Figure 13 This is an exploded view of the adapter, tapered block, and connecting shaft structure.

[0030] The following are marked in the figure: 1. Throttle valve; 2. Gate valve; 3. Cross pipe; 4. Instrument flange; 5. Seismic pressure gauge; 6. Hydraulic safety valve; 7. Power assist assembly; 701. Electric actuator; 702. Transmission box; 703. Hand lever; 704. Power assist platform; 705. Hydraulic chamber; 706. Push block; 707. Electromagnetic chuck; 708. Fixing plate; 709. Magnetic metal plate; 710. Horizontal slide bar; 711. Ratchet; 712. Liquid inlet pipe; 713. Sealing cover; 714. Ratchet; 715. Rotating shaft; 716. Push rod; 717. Spring 1; 718. Ejector block; 719. Liquid discharge pipe; 720. Liquid storage tank; 721. Transmission sleeve; 722. Transmission slot; 723. Bearing; 724. Adapter; 725. Push plate; 726. Transmission block; 727. Spring 2; 728. Connecting shaft; 729. Conical block; 8. Upper flange; 9. Casing head body; 10. Casing hanger assembly; 11. Threaded flange; 12. Square right-angle stop valve. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] See also Figures 1-9 A gas injection and production wellhead device, which includes a four-way pipe 3, gate valves 2 are installed on the interfaces on both sides of the four-way pipe 3, a power-assisting assembly 7 is installed on the gate valve 2, the gate valve 2 is connected to the throttle valve 1 and the instrument flange 4, and a seismic pressure gauge 5 is installed on the instrument flange 4. The four-way pipe 3 is connected to the upper flange 8 through a hydraulic safety valve 6, and the upper flange 8 is bolted to the casing head body 9. A casing hanger assembly 10 is installed in the casing head body 9. The two sides of the casing head body 9 are connected to the threaded flange 11 and the square right-angle section through the gate valve 2 Check valve 12; the power assist assembly 7 includes an electric actuator 701 and a transmission box 702, the transmission box 702 is mounted on the electric actuator 701, the rotating shaft of the electric actuator 701 extends into the transmission box 702, and a hand lever 703 is rotatably mounted on the transmission box 702; a power assist platform 704 is fixedly mounted in the transmission box 702, a ratchet 711 is mounted on the hand lever 703, the ratchet 711 is located in the power assist platform 704, and a hydraulic chamber 705 is provided in the power assist platform 704, and the hydraulic chamber 705 is connected to the inlet The liquid pipe 712 is rotatably mounted on the wall of the liquid inlet of the liquid inlet pipe 712, and a rotating shaft 715 is rotatably mounted on one side of the rotating shaft 715 and a push rod 716 is mounted on the other side, and the sealing cover 713 blocks the liquid inlet of the liquid inlet pipe 712; a ratchet 714 is rotatably mounted on the inner wall of the assisting platform 704, and the ratchet 714 is connected to the push rod 716; a transverse slide bar 710 is slidably mounted on the assisting platform 704, and a push block 706 is mounted on one side of the transverse slide bar 710 and a fixed plate 708 is mounted on the other side, and the push block 706 is Located inside the hydraulic chamber 705, an electromagnetic suction cup 707 is installed on the power-assisting platform 704, and a magnetic metal plate 709 is installed on the fixed plate 708. The electromagnetic suction cup 707 attracts the magnetic metal plate 709; a connecting shaft 728 is fixedly installed on the electric actuator 701, and the connecting shaft 728 and the hand lever 703 are detachably connected; when the electric actuator 701 is working, the connecting shaft 728 is disconnected from the hand lever 703, and when the electric actuator 701 stops, the fixed plate 708 is connected to the hand lever 703.

[0033] Specifically, a top block 718 is installed on one side of the ratchet tooth 714, and the top block 718 abuts against the ratchet tooth 714; the ratchet tooth 714 is connected to the inner wall of the power-assisting platform 704 through a spring 717, and a drain pipe 719 is installed on the power-assisting platform 704, and a liquid storage tank 720 is installed at the bottom of the transmission box 702, and the drain pipe 719 is connected to the liquid storage tank 720; as the hand lever 703 is closed and rotated in one direction, the ratchet wheel 711 lifts the ratchet tooth 714, and the push rod 716 is pushed to move by the rotation of the ratchet tooth 714, thereby driving the rotation shaft 715, and the rotating shaft 715 drives the sealing cover 713 to separate from the liquid inlet of the liquid inlet pipe 712; when the hand lever 703 is opened and rotated in one direction, the ratchet wheel 711 abuts against the ratchet tooth 714, and the rotation of the ratchet tooth 714 is suppressed by the top block 718.

[0034] It should be noted that, in the initial state, see Figure 8 , the transmission block 726 retracts into the adapter 724, and the adapter 724 is disconnected from the transmission sleeve 721. If the electric actuator 701 is running at this time, the electric actuator 701 drives the connecting shaft 728 and the adapter 724 to rotate synchronously. Since the adapter 724 is disconnected from the transmission sleeve 721, the electric actuator 701 will not affect the hand lever 703. Similarly, the hand lever 703 will not interfere with the movement of the electric actuator 701.

[0035] When the electric actuator 701 stops running or fails, the electromagnetic chuck 707 is energized, and the electromagnetic chuck 707 attracts the magnetic metal plate 709, which drives the fixed plate 708 to move. At this time, the fixed plate 708 pushes the hydraulic oil in the hydraulic chamber 705 through the push block 706, thereby pressurizing the hydraulic chamber 705. During the movement of the fixed plate 708, the fixed plate 708 pushes the push plate 725 to move toward the inside of the adapter 724 through the bearing 723. Figure 8 At this time, the push plate 725 pushes the transmission block 726 through the tapered block 729 to extend out of the adapter 724. At this time, the adapter 724 is connected to the transmission sleeve 721. By manually rotating the hand lever 703, the hand lever 703 drives the connecting shaft 728 to rotate through the ratchet 711 and the transmission sleeve 721, and the gate valve 2 is manually closed through the hand lever 703.

[0036] During this process, the hand lever 703 drives the ratchet 711 to rotate. As the ratchet 711 rotates, the teeth on the ratchet 711 push up the ratchet 714, and the rotation of the ratchet 714 pushes the push rod 716 to move, thereby driving the rotating shaft 715 to rotate. The rotating shaft 715 drives the sealing cover 713 to separate from the liquid port of the liquid inlet pipe 712. At this time, the hydraulic oil in the hydraulic chamber 705 drives the ratchet 711 to rotate, and then the hydraulic oil is discharged from the drain pipe 719, thereby providing rotation assistance for the hand lever 703, accelerating the closing of the gate valve 2, and greatly reducing the probability of gas leakage.

[0037] Specifically, if the hand lever 703 is rotated in the direction of closing the gate valve 2, the hydraulic oil in the hydraulic chamber 705 will provide steering assistance for the hand lever 703; if the staff rotates the hand lever 703 in the direction of opening the gate valve 2, the hand lever 703 drives the ratchet 711 to rotate. At this time, the teeth on the ratchet 711 are against the ratchet teeth 714, and the rotation of the hand lever 703 in this direction is suppressed by the top block 718 resisting the rotation of the ratchet teeth 714, thereby preventing the worker from accidentally opening the gate valve 2 in an emergency, increasing the scope of gas leakage, and causing further accidents.

[0038] It should be noted that a hydraulic pressure device can be connected to the hydraulic chamber 705 to provide higher hydraulic pressure to reduce the steering resistance of the handle 703. The discharge pipe 719 and the inlet pipe 712 are provided as a single component. When the ratchet 711 rotates, the ratchet 711 drives the inlet pipe 712 and the discharge pipe 719 to open and close synchronously, thereby providing precise power assistance.

[0039] See also Figure 5-Figure 13 A transmission sleeve 721 is installed on the back of the ratchet 711, and a transmission groove 722 is opened in the transmission sleeve 721. An adapter 724 is installed on the connecting shaft 728, and the adapter 724 is located inside the transmission sleeve 721 and rotates.

[0040] Specifically, the transmission block 726 is installed in the longitudinal sliding state in the adapter 724, and the push plate 725 is installed in the transverse sliding state in the adapter 724. The push plate 725 is installed on the conical block 729, and the conical block 729 abuts against the inclined surface on the transmission block 726; by pushing the push plate 725 and the conical block 729 to move, the conical block 729 pushes the transmission block 726 out of the adapter 724, so that the adapter 724 cooperates with the transmission groove 722.

[0041] Specifically, a bearing 723 is installed on the fixing plate 708 , and the push plate 725 is in contact with the bearing 723 ; the conical block 729 is connected to the inner wall of the adapter 724 via a second spring 727 .

[0042] It should be noted that when the electromagnetic chuck 707 is energized, the electromagnetic chuck 707 attracts the magnetic metal plate 709, which drives the fixed plate 708 to move. During the movement of the fixed plate 708, the fixed plate 708 pushes the push plate 725 to move toward the inside of the adapter 724 through the bearing 723. Figure 8 At this time, the push plate 725 pushes the transmission block 726 through the conical block 729 to extend out of the adapter 724. At this time, the adapter 724 is connected to the transmission sleeve 721. When the electromagnetic suction cup 707 is powered off, the spring 2 727 drives the conical block 729 and the push plate 725 to reset. At the same time, the transmission block 726 is reset, and the push plate 725 pushes the fixed plate 708 to reset.

[0043] See also Figure 11-13The transmission groove 722 is larger than the transmission block 726, so that the transmission sleeve 721 rotates a certain distance and then cooperates with the transmission block 726.

[0044] It should be noted that when the hand lever 703 is rotated for the first time, the ratchet 711 needs to be rotated to a certain angle by the hand lever 703 so that the ratchet 711 can open the liquid inlet pipe 712 by acting on the ratchet teeth 714 to achieve hydraulic assistance. During this period of time, it is extremely laborious and time-consuming to close the gate valve 2 without hydraulic assistance of the hand lever 703.

[0045] Based on this, through the setting of the transmission groove 722 of the present invention being larger than the transmission block 726, in the process of rotating the hand lever 703 to emergency close the gate valve 2, the hand lever 703 needs to be rotated to a certain angle before the transmission groove 722 can be connected to the transmission block 726 for transmission, so that there is a connection delay between the transmission sleeve 721 and the adapter 724, ensuring that after the liquid inlet pipe 712 is opened to realize hydraulic assistance, the hand lever 703 is connected to the electric actuator 701, thereby improving the closing efficiency of the gate valve 2.

[0046] The implementation principle of the present invention is: in the initial state, see Figure 8 , the transmission block 726 retracts into the adapter 724, and the adapter 724 is disconnected from the transmission sleeve 721. If the electric actuator 701 is running at this time, the electric actuator 701 drives the connecting shaft 728 and the adapter 724 to rotate synchronously. Since the adapter 724 is disconnected from the transmission sleeve 721, the electric actuator 701 will not affect the hand lever 703. Similarly, the hand lever 703 will not interfere with the movement of the electric actuator 701.

[0047] When the electric actuator 701 stops running or fails, the electromagnetic chuck 707 is energized, and the electromagnetic chuck 707 attracts the magnetic metal plate 709, which drives the fixed plate 708 to move. At this time, the fixed plate 708 pushes the hydraulic oil in the hydraulic chamber 705 through the push block 706, thereby pressurizing the hydraulic chamber 705. During the movement of the fixed plate 708, the fixed plate 708 pushes the push plate 725 to move toward the inside of the adapter 724 through the bearing 723. Figure 8 At this time, the push plate 725 pushes the transmission block 726 through the tapered block 729 to extend out of the adapter 724. At this time, the adapter 724 is connected to the transmission sleeve 721. By manually rotating the hand lever 703, the hand lever 703 drives the connecting shaft 728 to rotate through the ratchet 711 and the transmission sleeve 721, and the gate valve 2 is manually closed through the hand lever 703.

[0048] During this process, the hand lever 703 drives the ratchet 711 to rotate. As the ratchet 711 rotates, the teeth on the ratchet 711 push up the ratchet 714, and the rotation of the ratchet 714 pushes the push rod 716 to move, thereby driving the rotating shaft 715 to rotate. The rotating shaft 715 drives the sealing cover 713 to separate from the liquid port of the liquid inlet pipe 712. At this time, the hydraulic oil in the hydraulic chamber 705 drives the ratchet 711 to rotate, and then the hydraulic oil is discharged from the drain pipe 719, thereby providing rotation assistance for the hand lever 703, accelerating the closing of the gate valve 2, and greatly reducing the probability of gas leakage.

[0049] If the hand lever 703 is rotated in the direction of closing the gate valve 2, the hydraulic oil in the hydraulic chamber 705 will provide steering assistance for the hand lever 703; if the worker rotates the hand lever 703 in the direction of opening the gate valve 2, the hand lever 703 drives the ratchet 711 to rotate. At this time, the teeth on the ratchet 711 abut against the ratchet teeth 714, and the hand lever 703 is suppressed from rotating in this direction by the top block 718 abutting against the rotation of the ratchet teeth 714, thereby preventing the worker from accidentally opening the gate valve 2 in an emergency, increasing the scope of gas leakage, and causing further accidents.

[0050] Specifically, when the hand lever 703 is rotated for the first time, the hand lever 703 needs to drive the ratchet 711 to rotate a certain angle so that the ratchet 711 can open the liquid inlet pipe 712 by acting on the ratchet teeth 714 to achieve hydraulic assistance. During this period of time, it is extremely laborious and time-consuming to close the gate valve 2 without hydraulic assistance of the hand lever 703.

[0051] Based on this, through the setting of the transmission groove 722 of the present invention being larger than the transmission block 726, in the process of rotating the hand lever 703 to emergency close the gate valve 2, the hand lever 703 needs to be rotated to a certain angle before the transmission groove 722 can be connected to the transmission block 726 for transmission, so that there is a connection delay between the transmission sleeve 721 and the adapter 724, ensuring that after the liquid inlet pipe 712 is opened to realize hydraulic assistance, the hand lever 703 is connected to the electric actuator 701, thereby improving the closing efficiency of the gate valve 2.

[0052] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A gas injection and production wellhead device, characterized by: It comprises a four-way pipe (3), gate valves (2) are respectively installed on the interfaces on both sides of the four-way pipe (3), a power assist assembly (7) is installed on the gate valve (2), the gate valve (2) is connected to the throttle valve (1) and the instrument flange (4), a seismic pressure gauge (5) is installed on the instrument flange (4), the four-way pipe (3) is connected to the upper flange (8) through the hydraulic safety valve (6), the upper flange (8) is bolted to the casing head body (9), a casing hanger assembly (10) is installed in the casing head body (9), and the two sides of the casing head body (9) are respectively connected to the threaded flange (11) and the square right-angle stop valve (12) through the gate valve (2); The power assist assembly (7) comprises an electric actuator (701) and a transmission box (702), wherein the transmission box (702) is mounted on the electric actuator (701), a rotating shaft of the electric actuator (701) extends into the transmission box (702), and a hand lever (703) is rotatably mounted on the transmission box (702); a power assist platform (704) is fixedly mounted in the transmission box (702), a ratchet (711) is mounted on the hand lever (703), and the ratchet (711) is located in the power assist platform (704). A hydraulic chamber (705) is provided in the assisting platform (704), the hydraulic chamber (705) is connected to a liquid inlet pipe (712), a rotating shaft (715) is rotatably mounted on the wall of the liquid inlet of the liquid inlet pipe (712), a sealing cover (713) is mounted on one side of the rotating shaft (715), and a push rod (716) is mounted on the other side, and the sealing cover (713) blocks the liquid inlet of the liquid inlet pipe (712); a ratchet (714) is rotatably mounted on the inner wall of the assisting platform (704), and the ratchet (714) is connected to the push rod (716); A transverse slide bar (710) is slidably mounted on the assisting platform (704), a push block (706) is mounted on one side of the transverse slide bar (710), and a fixed plate (708) is mounted on the other side, and the push block (706) is located inside the hydraulic chamber (705). An electromagnetic suction cup (707) is mounted on the assisting platform (704), and a magnetic metal plate (709) is mounted on the fixed plate (708), and the electromagnetic suction cup (707) attracts the magnetic metal plate (709); A connecting shaft (728) is fixedly mounted on the electric actuator (701), and the connecting shaft (728) and the hand lever (703) are detachably connected; when the electric actuator (701) is operating, the connecting shaft (728) and the hand lever (703) are disconnected, and when the electric actuator (701) stops, the fixed plate (708) is connected to the hand lever (703).

2. A gas injection and production wellhead device according to claim 1, characterized in that: A top block (718) is installed on one side of the ratchet (714), and the top block (718) abuts against the ratchet (714); the ratchet (714) is connected to the inner wall of the assisting platform (704) via a spring (717); a drain pipe (719) is installed on the assisting platform (704); a liquid storage tank (720) is installed at the bottom of the transmission box (702), and the drain pipe (719) is connected to the liquid storage tank (720); As the hand lever (703) rotates in a one-way closing manner, the ratchet (711) pushes up the ratchet (714), and the ratchet (714) rotates to push the push rod (716) to move, thereby driving the rotating shaft (715) to rotate, and the rotating shaft (715) drives the cover (713) to separate from the liquid port of the liquid inlet pipe (712); when the hand lever (703) rotates in a one-way opening manner, the ratchet (711) and the ratchet (714) are abutted against each other, and the ratchet (714) is inhibited from rotating by the top block (718).

3. A gas injection and production wellhead device according to claim 1, characterized in that: A transmission sleeve (721) is installed on the back of the ratchet (711), a transmission slot (722) is provided in the transmission sleeve (721), and an adapter (724) is installed on the connecting shaft (728), and the adapter (724) is located inside the transmission sleeve (721) and rotates.

4. A gas injection and production wellhead device according to claim 3, characterized in that: A transmission block (726) is longitudinally slidably installed in the adapter (724), a push plate (725) is transversely slidably installed in the adapter (724), a conical block (729) is installed on the push plate (725), and the conical block (729) abuts against the inclined surface on the transmission block (726); by pushing the push plate (725) and the conical block (729) to move, the conical block (729) pushes the transmission block (726) out of the adapter (724), so that the adapter (724) is matched with the transmission groove (722).

5. A gas injection and production wellhead device according to claim 4, characterized in that: A bearing (723) is mounted on the fixed plate (708), and the push plate (725) is in contact with the bearing (723); the conical block (729) is connected to the inner wall of the adapter (724) via a second spring (727).

6. A gas injection and production wellhead device according to claim 5, characterized in that: The transmission groove (722) is larger than the transmission block (726), so that the transmission sleeve (721) rotates a certain distance before cooperating with the transmission block (726).

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