Quick pressure relief gas injection wellhead

Abstract

The invention discloses a quick pressure relief gas injection wellhead, and belongs to the technical field of oil well exploitation. According to the rapid pressure relief gas injection well mouth and the well mouth, the well mouth is formed by mutual matching of a plurality of pressure relief valves, a valve element matched with a columnar channel is arranged on the outer wall of a valve rod, a protection assembly used for protecting the valve element is arranged on the inner wall of a valve body, and the protection assembly comprises an auxiliary valve element arranged in the columnar channel in a matched mode. Through the arrangement of the protection assembly, when the pressure release valve is closed, the driving mechanism drives the auxiliary valve element and the valve element to rotate synchronously, the valve element and the auxiliary valve element are matched, a sealing bin is formed in the columnar channel, at the moment, fluid enters the sealing bin through the circulation mechanism, and the internal pressure of the sealing bin is increased to be the same as the force generated above the valve element; and through the change of the pressure above the valve element, self-adjustment of the pressure in the sealing bin is achieved, and the situation that due to the fact that the pressures on the two faces of the valve element are different, the valve body is scrapped too early is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of oil well mining, in particular to a valve device for an oil well, and more particularly to a fast pressure relief gas injection wellhead. Background Art

[0002] Gas injection wellheads are key facilities for achieving "gas injection to increase production" in oil and gas field development. They are mainly used to control the injection of high-pressure gas into the formation. Their design must meet the requirements of air tightness, pressure resistance and safety. Their design and operation must take into account pressure control, medium adaptability and safety. The core design includes airtight sealing structure, high-strength material selection, intelligent control system, etc. With the promotion of technologies such as CCUS, the application of gas injection wellheads in the integration of carbon sequestration and energy development will become more extensive, and the requirements for high temperature resistance, corrosion resistance and other properties will continue to increase.

[0003] Chinese patent CN117489836B announced on March 8, 2024 discloses an adjustable quick-start pressure relief valve, which is provided with two semicircular valve bodies that can be folded and opened in half through the valve discharge pipe joint. The two semicircular valve bodies are connected to the valve sealing cover by a scissor frame 1, so that a linkage relationship is formed between the semicircular valve body and the valve sealing cover 4. When the semicircular valve body is opened, the valve sealing cover is also opened accordingly. When the semicircular valve body 11 is closed, the valve sealing cover is also closed accordingly, so that the pressure relief valve of the present invention has a double opening and closing structure, which improves the air tightness and safety of the pressure relief valve. However, the adjustable quick-start pressure relief valve adopts a folding structure. When closed, one of the sealing surfaces is in hard contact with the fluid, resulting in unbalanced pressure on both sides of the valve core. Long-term erosion will further destroy its sealing structure, thereby causing the valve body to be scrapped prematurely. Summary of the Invention

[0004] The object of the present invention is to provide a fast pressure relief gas injection wellhead to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a fast pressure relief gas injection wellhead, comprising a wellhead, wherein the wellhead is formed by a plurality of pressure relief valves cooperating with each other, the pressure relief valve comprising a valve body, a columnar channel for fluid circulation is formed in the valve body, a valve stem is rotatably connected to the inner wall of the valve body, a valve core adapted for the columnar channel is provided on the outer wall of the valve stem, a handwheel is fixedly connected to the outer wall of one end of the valve stem, a protective component for protecting the valve core is provided on the inner wall of the valve body, the protective component comprises an auxiliary valve core adapted for the columnar channel, and a driving mechanism arranged inside the valve body, the auxiliary valve core is installed inside the columnar channel by the driving mechanism in a manner of rotating in parallel with the direction of the valve core, the valve core and the valve core cooperate to form a sealing chamber inside the columnar channel, and the sealing chamber is connected to the columnar channel through a circulation mechanism.

[0006] Furthermore, a filler is provided at the connection between the valve body and the valve stem, and a shaft sleeve is connected to the outer wall of one end of the valve stem.

[0007] Furthermore, the driving mechanism includes fins installed on the outer walls at both ends of the auxiliary valve core, and an oil tank opened on the inner wall of the valve body. A rotating groove adapted to the fins is provided on the inner wall of the valve body, and a piston plate adapted to the oil tank is provided on the outer wall of the valve stem. The rotating groove and the oil tank are connected by a flow channel.

[0008] Furthermore, the driving mechanism also includes an oil inlet opened on the outer wall of the valve body, the oil inlet and the oil tank are connected by a conical groove, a bolt is threadedly connected to the inner wall of the oil inlet, a push rod is fixedly connected to the outer wall of one end of the bolt, a connecting block is fixedly connected to the inner wall of the oil inlet, a through hole adapted for the push rod is provided on the outer wall of the bottom end of the connecting block, a funnel groove adapted for the through hole is provided on the outer wall of the top end of the connecting block, a spring is fixedly connected to the outer wall of the top end of the connecting block, a conical block adapted for the conical groove is provided on the outer wall of one end of the spring, and an oil outlet is provided on the outer wall of the conical block.

[0009] Furthermore, the conical block forms a telescopic structure with the connecting block through a spring, and the size of the conical block matches that of the conical groove.

[0010] Furthermore, the oil outlet is provided in multiple groups on the surface of the conical block, and the oil inlet end of the oil outlet is provided on the top outer wall of the conical block, and the oil outlet end is provided on the side wall of the conical block, and the bottom outer wall of the conical block cooperates with the top inner wall of the oil tank to form an arc surface.

[0011] Furthermore, the circulation mechanism includes an air intake channel arranged on the inner wall of the valve stem, a connecting channel adapted to the air intake channel is provided on the inner wall of the valve body, and one end of the connecting channel is connected to the sealing chamber, a through groove adapted to the sealing chamber is provided on the outer wall of the valve stem, a connecting groove adapted to the through groove is provided on the outer wall of the valve stem, a limiting column adapted to the air intake channel is provided on the inner wall of the connecting groove, a connecting ring is fixedly connected to the outer wall of the limiting column, a sliding groove adapted to the connecting ring is provided on the inner wall of the valve stem, and the sliding groove is connected to the air intake channel through the air inlet.

[0012] Furthermore, the diameter of the air inlet matches the diameter of the through groove, and the plane size of the connecting ring is smaller than the plane size of the limiting column.

[0013] Furthermore, the air intake channel is rotatably connected to the connecting channel via a valve stem.

[0014] The difference from the prior art is that the beneficial effects of this application are: (1) The rapid pressure relief gas injection wellhead, through the setting of the protective component, when the pressure relief valve is closed, the auxiliary valve core is driven by the driving mechanism to rotate synchronously with the valve core, so that the valve core and the auxiliary valve core cooperate and form a sealed chamber inside the columnar channel. At this time, the fluid enters the interior of the sealed chamber through the circulation mechanism, so that the pressure inside the sealed chamber rises to the same level as the force above the valve core, thereby ensuring the balance of pressure on the upper and lower sides of the valve core, and realizing self-regulation of the pressure inside the sealed chamber through the change of the pressure above the valve core, thereby preventing the valve core from being scrapped prematurely due to the different pressures on the two sides.

[0015] (2) The rapid pressure relief gas injection wellhead is configured such that the diameter of the gas inlet is the same as that of the through groove, and the plane size of the connecting ring is smaller than the plane size of the limiting column, so that under the same pressure, the fluid can push the limiting column to limit the gas inlet channel.

[0016] (3) The rapid pressure relief gas injection wellhead can realize the synchronous rotation of the valve core and the auxiliary valve core by squeezing the hydraulic oil inside the oil tank through the rotation of the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic side sectional structural diagram of the present invention; Figure 2 Schematic diagram of the internal structure of the pressure relief valve of the present invention; Figure 3 This is a schematic diagram of the structure of the auxiliary valve core and the fins cooperating with each other in the present invention; Figure 4 This is a schematic diagram of the structure of the rotary tank and the oil bin cooperating with each other in the present invention; Figure 5 This is a schematic diagram of the structure of the oil tank and the piston plate cooperating with each other in the present invention; Figure 6 This is a schematic diagram of the structure of the chute and the air inlet cooperating with each other in the present invention; Figure 7 It is a schematic diagram of the structure of the tapered block and the oil outlet cooperating with each other in the present invention.

[0018] In the figure: 1. Wellhead; 2. Pressure relief valve; 201. Valve body; 202. Columnar channel; 203. Valve stem; 204. Valve core; 3. Handwheel; 4. Bushing; 5. Packing; 6. Protective assembly; 601. Auxiliary valve core; 602. Fin; 603. Rotating groove; 604. Oil tank; 605. Piston plate; 606. Flow channel; 607. Sealing chamber; 608. Air inlet channel; 609. Connecting channel; 610. Through groove; 611. Connecting groove; 612. Limiting column; 613. Connecting ring; 614. Slide; 615. Air inlet; 616. Oil inlet; 617. Conical groove; 618. Bolt; 619. Push rod; 620. Connecting block; 621. Through hole; 622. Funnel groove; 623. Spring; 624. Conical block; 625. Oil outlet. DETAILED DESCRIPTION

[0019] The following will provide a clear and complete description of 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] Example 1 See also Figure 1 -and Figure 7 The present invention provides a technical solution: a fast pressure relief gas injection wellhead, including a wellhead 1, the wellhead 1 is formed by a plurality of pressure relief valves 2 that cooperate with each other, the pressure relief valve 2 includes a valve body 201, a columnar channel 202 for fluid circulation is formed in the valve body 201, a valve stem 203 is rotatably connected to the inner wall of the valve body 201, a valve core 204 adapted to the columnar channel 202 is provided on the outer wall of the valve stem 203, a hand wheel 3 is fixedly connected to the outer wall of one end of the valve stem 203, and a valve is provided on the inner wall of the valve body 201. The protective component 6 is used to protect the valve core 204. The protective component 6 includes an auxiliary valve core 601 adapted in the columnar channel 202, and a driving mechanism arranged inside the valve body 201. The auxiliary valve core 601 is installed inside the columnar channel 202 by the driving mechanism in a rotating manner parallel to the direction of the valve core 204. The valve core 204 cooperates with the valve core 204 to form a sealing chamber 607 inside the columnar channel 202. The sealing chamber 607 is connected to the columnar channel 202 through a circulation mechanism.

[0022] When in use, the rotating hand wheel 3 drives the valve core 204 to rotate inside the columnar channel 202 through the valve stem 203, so that the valve core 204 limits the columnar channel 202, thereby closing the pressure relief valve 2. The valve stem 203 can drive the driving mechanism to work when rotating, and drive the auxiliary valve core 601 and the valve core 204 to rotate synchronously through the driving mechanism. When the auxiliary valve core 601 and the valve core 204 are closed, the gap between the auxiliary valve core 601 and the valve core 204 will form a closed sealing chamber 607. At this time, the valve core 20 The pressure above the sealing surface that is in hard contact with the fluid will increase, and the fluid will continuously impact the sealing surface. During this process, the fluid above the valve core 204 can enter the interior of the sealing chamber 607 through the circulation mechanism. After the pressure inside the sealing chamber 607 is balanced with the pressure above the valve core 204, the circulation mechanism will close and limit the fluid from entering the interior of the sealing chamber 607, so that the pressure on the upper and lower surfaces of the valve core 204 is kept balanced, thereby preventing the valve body 201 from being scrapped prematurely due to the pressure difference between the two sides of the valve core 204.

[0023] See also Figure 2 A packing 5 is provided at the connection between the valve body 201 and the valve stem 203 , and a shaft sleeve 4 is connected to the outer wall of one end of the valve stem 203 .

[0024] During use, by arranging the packing 5 and the shaft sleeve 4 between the valve body 201 and the valve stem 203 , particles in the fluid can be prevented from entering between the valve body 201 and the valve stem 203 , thereby causing the valve body 201 and the valve stem 203 to be stuck to each other.

[0025] See also Figure 3 、 Figure 4 and Figure 5 The driving mechanism includes fins 602 installed on the outer walls of both ends of the auxiliary valve core 601, and an oil tank 604 opened on the inner wall of the valve body 201. A rotating groove 603 adapted to the fins 602 is provided on the inner wall of the valve body 201, and a piston plate 605 adapted to the oil tank 604 is provided on the outer wall of the valve stem 203. The rotating groove 603 and the oil tank 604 are connected by a flow channel 606.

[0026] During use, when the pressure relief valve 2 is closed, the valve stem 203 rotates, causing the valve stem 203 to drive the piston plate 605 to move inside the oil tank 604, thereby squeezing the hydraulic oil inside the oil tank 604 and pushing the hydraulic oil into the rotating groove 603 through the flow channel 606, increasing the internal pressure of the rotating groove 603 and pushing the fin 602 to rotate along the inner wall of the rotating groove 603. When the fin 602 rotates inside the rotating groove 603, it can drive the auxiliary valve core 601 to rotate synchronously, thereby realizing the synchronous rotation of the auxiliary valve core 601 and the valve core 204 and forming a sealed chamber 607. When the pressure relief valve 2 is opened, the piston plate 605 is reset, and the hydraulic oil inside the rotating groove 603 is drawn back to the inside of the oil tank 604, thereby opening the auxiliary valve core 601.

[0027] See also Figure 2 、 Figure 4 、 Figure 5 and Figure 7 The driving mechanism also includes an oil inlet 616 opened on the outer wall of the valve body 201, and the oil inlet 616 is connected to the oil tank 604 through a tapered groove 617. A bolt 618 is threadedly connected to the inner wall of the oil inlet 616, and a push rod 619 is fixedly connected to the outer wall of one end of the bolt 618. A connecting block 620 is fixedly connected to the inner wall of the oil inlet 616, and a through hole 621 adapted to the push rod 619 is provided on the outer wall of the bottom end of the connecting block 620, and a funnel groove 622 adapted to the through hole 621 is provided on the outer wall of the top end of the connecting block 620, and a spring 623 is fixedly connected to the outer wall of the top end of the connecting block 620, and a tapered block 624 adapted to the tapered groove 617 is provided on the outer wall of one end of the spring 623, and an oil outlet 625 is provided on the outer wall of the tapered block 624.

[0028] When in use, first inject the hydraulic oil into the oil inlet 616. At this time, the hydraulic oil will gather above the through hole 621 through the funnel groove 622 on the surface of the connecting block 620, and drip onto the top of the tapered block 624 through the through hole 621. Then, it will pass through the interior of the tapered block 624 through the oil outlet 625 and flow out from the side of the tapered block 624. The hydraulic oil flowing out of the oil outlet 625 will be injected into the interior of the oil tank 604 through the tapered groove 617. After the interior of the oil tank 604 is filled with hydraulic oil, the bolt 618 is inserted into the interior of the oil inlet 616, so that the push rod 61 at one end of the bolt 618 is pressed against the push rod 61. 9 passes through the through hole 621 and contacts the surface of the tapered block 624, and then the bolt 618 is rotated to make the bolt 618 threadedly connected to the oil inlet 616 and slide downward. When the bolt 618 slides downward, it can push the tapered groove 617 downward through the push rod 619 and stretch the spring 623 to make the tapered groove 617 enter the interior of the tapered groove 617, so that the tapered groove 617 squeezes the inner wall of the tapered groove 617 and limits the tapered groove 617 to prevent the hydraulic oil from entering the interior of the oil inlet 616 through the tapered groove 617 when the piston plate 605 squeezes the hydraulic oil in the oil tank 604.

[0029] See also Figure 7 The conical block 624 forms a telescopic structure with the connecting block 620 through the spring 623 , and the size of the conical block 624 matches that of the conical groove 617 .

[0030] When in use, the conical block 624 is connected to the connecting block 620 via the spring 623, so that when the bolt 618 is installed, the conical block 624 is moved downward by the force and stretches the spring 623, completing the limitation of the conical groove 617. When the bolt 618 is removed, the spring 623 is forced to pull the conical block 624 back to its original position, causing the conical block 624 to slide out of the inside of the conical groove 617, thereby releasing the limitation of the conical groove 617.

[0031] See also Figure 7 There are multiple groups of oil outlets 625 on the surface of the conical block 624, and the oil inlet end of the oil outlet 625 is set on the top outer wall of the conical block 624, and the oil outlet end is set on the side wall of the conical block 624. The bottom outer wall of the conical block 624 cooperates with the top inner wall of the oil tank 604 to form an arc surface.

[0032] During use, the setting of multiple groups of oil outlets 625 can ensure the efficiency of injecting hydraulic oil into the oil tank 604, and the setting of the oil outlet end of the oil outlet 625 on the side wall of the conical block 624 makes it possible for the conical block 624 to fit the outer wall of the conical block 624 and the inner wall of the conical groove 617 when entering the conical groove 617, thereby limiting the oil outlet 625 and preventing the hydraulic oil inside the oil tank 604 from being squeezed and flowing back through the oil outlet 625.

[0033] See also Figure 4 and Figure 6 The circulation mechanism includes an air inlet channel 608 arranged on the inner wall of the valve stem 203, a connecting channel 609 adapted to the air inlet channel 608 is provided on the inner wall of the valve body 201, and one end of the connecting channel 609 is connected to the sealing chamber 607, a through groove 610 adapted to the sealing chamber 607 is provided on the outer wall of the valve stem 203, a connecting groove 611 adapted to the through groove 610 is provided on the outer wall of the valve stem 203, a limiting column 612 adapted to the air inlet channel 608 is provided on the inner wall of the connecting groove 611, a connecting ring 613 is fixedly connected to the outer wall of the limiting column 612, a sliding groove 614 adapted to the connecting ring 613 is provided on the inner wall of the valve stem 203, and the sliding groove 614 is connected to the air inlet channel 608 through the air inlet port 615.

[0034] When in use, after the valve core 204 and the auxiliary valve core 601 are closed, one end of the air inlet channel 608 on the outer wall of the valve stem 203 will be connected to the connecting channel 609, and the other end will face the high-pressure fluid above the valve core 204, so that the fluid above the valve core 204 enters the interior of the air inlet channel 608. At this time, the air inlet channel 608 is blocked by the limiting column 612, so that the fluid entering the interior of the air inlet channel 608 is diverted to enter the air inlet port 615, and passes through the air inlet port 615 into the interior of the slide groove 614, so that the pressure inside the slide groove 614 increases, thereby pushing the connecting ring 613 to slide inside the slide groove 614. When the connecting ring 613 moves, it can drive the limiting column 612 to slide toward the interior of the connecting groove 611, so that one end of the limiting column 612 slides out of the interior of the air inlet channel 608 and enters the connecting groove 611, thereby releasing the limit on the air inlet channel 608. At this time, the fluid can pass through the air inlet channel 608 into the connecting channel 609 and pass through The connecting channel 609 enters the sealed chamber 607, increasing the pressure inside the sealed chamber 607. When the pressure inside the sealed chamber 607 is the same as the pressure above the valve core 204, the fluid entering the sealed chamber 607 will enter the interior of the connecting groove 611 through the through groove 610 and increase the internal pressure of the connecting groove 611, thereby pushing the limit post 612 to slide out, so that one end of the limit post 612 slides out of the interior of the connecting groove 611 and engages with the air inlet channel 608, thereby limiting the air inlet channel 608 and preventing the fluid from continuing to enter the interior of the sealed chamber 607. When the pressure above the valve core 204 increases again on the original basis, the fluid will again enter the interior of the slide groove 614 through the air inlet 615, thereby releasing the limit on the air inlet channel 608 and entering the interior of the sealed chamber 607 through the air inlet channel 608, thereby adjusting the pressure inside the sealed chamber 607, thereby realizing self-regulation of the pressure at the upper and lower ends of the valve core 204.

[0035] See also Figure 6 The diameter of the air inlet 615 is consistent with the diameter of the through groove 610 , and the plane size of the connecting ring 613 is smaller than the plane size of the limiting column 612 .

[0036] During use, by setting the diameter of the air inlet 615 to be the same as the diameter of the through groove 610, when the pressure above the valve core 204 is the same as the pressure inside the sealing chamber 607, the mass of the fluid entering the slide groove 614 through the air inlet 615 is the same as the mass of the fluid flowing into the connecting groove 611 through the through groove 610, and the plane size of the connecting ring 613 is smaller than the plane size of the limiting column 612, so that under the same pressure, the force borne by the limiting column 612 is higher than the force borne by the connecting ring 613, so that under the same pressure, the thrust of the fluid on the limiting column 612 is greater than the thrust of the fluid on the connecting ring 613, so that under the same pressure, the limiting column 612 can be pushed to reset the air inlet channel 608.

[0037] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A fast pressure relief gas injection wellhead, comprising a wellhead (1), wherein the wellhead (1) is formed by a plurality of pressure relief valves (2) cooperating with each other, wherein the pressure relief valve (2) comprises a valve body (201), wherein a columnar channel (202) for fluid circulation is formed in the valve body (201), a valve stem (203) is rotatably connected to the inner wall of the valve body (201), a valve core (204) adapted to the columnar channel (202) is provided on the outer wall of the valve stem (203), and a hand wheel (3) is fixedly connected to the outer wall of one end of the valve stem (203), characterized in that: A protective component (6) for protecting the valve core (204) is provided on the inner wall of the valve body (201), and the protective component (6) includes an auxiliary valve core (601) adapted to be in the columnar channel (202), and a driving mechanism provided inside the valve body (201), wherein the auxiliary valve core (601) is installed inside the columnar channel (202) by the driving mechanism in a manner of rotating in parallel with the direction of the valve core (204), and the valve core (204) cooperates with the valve core (204) to form a sealing chamber (607) inside the columnar channel (202), and the sealing chamber (607) is connected to the columnar channel (202) through a circulation mechanism.

2. The rapid pressure relief gas injection wellhead according to claim 1, characterized in that: A filler (5) is provided at the connection between the valve body (201) and the valve stem (203), and a shaft sleeve (4) is connected to the outer wall of one end of the valve stem (203).

3. The rapid pressure relief gas injection wellhead according to claim 1, characterized in that: The driving mechanism comprises fins (602) mounted on the outer walls of both ends of the auxiliary valve core (601), and an oil bin (604) provided on the inner wall of the valve body (201); a rotating groove (603) adapted for the fins (602) is provided on the inner wall of the valve body (201); a piston plate (605) adapted for the oil bin (604) is provided on the outer wall of the valve stem (203); and the rotating groove (603) and the oil bin (604) are connected via a flow channel (606).

4. The rapid pressure relief gas injection wellhead according to claim 3, characterized in that: The driving mechanism further comprises an oil inlet (616) provided on the outer wall of the valve body (201), the oil inlet (616) being connected to the oil tank (604) via a tapered groove (617), a bolt (618) being threadedly connected to the inner wall of the oil inlet (616), a push rod (619) being fixedly connected to one end of the bolt (618) on the outer wall, a connecting block (620) being fixedly connected to the inner wall of the oil inlet (616), the connecting block (620) A through hole (621) adapted for the push rod (619) is provided on the outer wall at the bottom end of the connecting block (620), a funnel groove (622) adapted for the through hole (621) is provided on the outer wall at the top end of the connecting block (620), a spring (623) is fixedly connected to the outer wall at the top end of the connecting block (620), a conical block (624) adapted for the conical groove (617) is provided on the outer wall at one end of the spring (623), and an oil outlet (625) is provided on the outer wall of the conical block (624).

5. The rapid pressure relief gas injection wellhead according to claim 4, characterized in that: The conical block (624) forms a telescopic structure with the connecting block (620) via the spring (623), and the dimensions of the conical block (624) match those of the conical groove (617).

6. The rapid pressure relief gas injection wellhead according to claim 4, characterized in that: The oil outlets (625) are provided in multiple groups on the surface of the conical block (624), and the oil inlet ends of the oil outlets (625) are provided on the top outer wall of the conical block (624), and the oil outlet ends are provided on the side walls of the conical block (624). The bottom outer wall of the conical block (624) cooperates with the top inner wall of the oil tank (604) to form an arc surface.

7. The rapid pressure relief gas injection wellhead according to claim 1, characterized in that: The circulation mechanism includes an air inlet channel (608) provided on the inner wall of the valve stem (203), a connecting channel (609) adapted to the air inlet channel (608) is provided on the inner wall of the valve body (201), and one end of the connecting channel (609) is connected to the sealing chamber (607), a through groove (610) adapted to the sealing chamber (607) is provided on the outer wall of the valve stem (203), and a through groove (610) adapted to the sealing chamber (607) is provided on the outer wall of the valve stem (203). 0) is provided with a connecting groove (611) adapted to the air inlet channel (608), a limiting column (612) adapted to the air inlet channel (608) is provided on the inner wall of the connecting groove (611), a connecting ring (613) is fixedly connected to the outer wall of the limiting column (612), a sliding groove (614) adapted to the connecting ring (613) is provided on the inner wall of the valve stem (203), and the sliding groove (614) is connected to the air inlet channel (608) via an air inlet (615).

8. The rapid pressure relief gas injection wellhead according to claim 7, characterized in that: The diameter of the air inlet (615) matches the diameter of the through groove (610), and the plane size of the connecting ring (613) is smaller than the plane size of the limiting column (612).

9. The rapid pressure relief gas injection wellhead according to claim 7, characterized in that: The air inlet channel (608) is rotatably connected to the connecting channel (609) via the valve stem (203).

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