Controllable plugging device for gas production wellhead

Abstract

The controllable plugging device comprises a gas production opening, a controllable plugging mechanism is installed on the gas production opening, the controllable plugging mechanism comprises a clamping assembly and a clamping assembly, the clamping assembly comprises a pressing column, the pressing column can move up and down, and a plurality of clamping columns capable of moving in a reciprocating mode are arranged on the outer side of the pressing column at equal intervals; the clamping assembly comprises a sealing head, the sealing head is fixedly arranged at the bottom of the pressing column, a plurality of clamping plates are rotationally arranged on the inner side of the gas production opening, a sealing detection mechanism is further arranged on the gas production opening, and the sealing detection mechanism comprises a first detection unit. According to the design, whether gas escapes from the gas production port or not is detected in real time through the sealing detection mechanism, the controllable plugging mechanism is adjusted in real time to plug the gas production port, the controllable plugging mechanism adopts a multi-section plugging means, and the plugging effect is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field exploitation, and particularly to a controllable plugging device for a gas production wellhead. Background Technique

[0002] The exploitation of oil and gas fields is a key process for converting underground oil and gas resources into utilizable energy, covering geological exploration, drilling, well completion, oil / gas production, gathering and transportation, and post-maintenance. During the exploitation stage, gas wells transport formation fluids to the surface through natural flow or artificial lift (such as gas lift, sucker rod pump). In the actual production process, when the wellhead pressure rises abnormally, a blowout occurs, or equipment fails, the plugging device at the gas production wellhead cuts off the gas flow channel to prevent the accident from expanding, becoming an indispensable core device in oil and gas field development.

[0003] Traditional mechanical plugging methods usually install plugging valves at the gas production wellhead. Traditional mechanical plugging valves usually require manual operation. In case of accidents such as blowouts, they may not be able to respond in time, leading to the expansion of the accident. At the same time, the existing traditional mechanical plugging methods are relatively single, resulting in a fixed sealing performance at the gas production wellhead. Due to the lack of feedback adjustment design, the plugging device is not easy to adjust in real time according to the actual pressure of the gas production wellhead, leading to accidents such as blowouts. Therefore, to solve the above problems, a controllable plugging device for a gas production wellhead is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages of complex operation and inability to respond in time in the prior art, and to propose a controllable plugging device for a gas production wellhead.

[0005] To achieve the above purpose, the present invention adopts the following technical scheme: A controllable plugging device for a gas production wellhead includes a gas production port. An air outlet groove plate is fixedly connected to the inner side of the gas production port. A controllable plugging mechanism is installed on the gas production port. The controllable plugging mechanism includes a clamping component and a clamping component. The clamping component includes a pressure column, which can move up and down. A plurality of reciprocatingly movable clamping columns are equidistantly arranged on the outer side of the pressure column, and the clamping columns are engaged with the grooves formed on the outer side of the pressure column; The clamping component includes a sealing head, which is fixedly arranged at the bottom of the pressure column. A plurality of clamping plates are rotatably arranged inside the gas production port, and the plurality of clamping plates are used to clamp the sealing head, and the sealing head is used to plug the air outlet groove plate; A sealing detection mechanism is also arranged on the gas production port. The sealing detection mechanism includes a first detection unit. A plurality of sealing plates are rotatably arranged between the first detection unit and the gas production port. The angles between the sealing plates are adjustable, and the plurality of sealing plates are used to assist the first detection unit in detecting escaped gas.

[0006] The above technical solution further includes: The top of the gas intake is fixedly connected with an installation flange, the top of the installation flange is flange-connected with a sealing cylinder, the top of the sealing cylinder is fixedly connected with an installation cylinder, and a sealing gasket is installed on the top of the air outlet groove plate.

[0007] A driving component is arranged in the installation cylinder. The driving component includes a screw rod, which is in threaded connection with the installation cylinder. The bottom of the screw rod is rotatably connected with a pressure column. A sleeve is fixed on the top of the pressure column and is arranged outside the screw rod. The top of the sleeve is rotatably connected with a sliding tooth.

[0008] The sliding tooth is in clamping and sliding connection with the screw rod. A lifting motor is fixedly connected to the side of the sleeve. The output end of the lifting motor is fixedly connected with a lifting driving gear, which is meshed with the sliding tooth.

[0009] The clamping component further includes a fixed circular ring plate. A plurality of notches are equidistantly arranged on the outer circumference of the pressure column. The fixed circular ring plate is arranged outside the pressure column and is fixedly connected with the sealing cylinder. A plurality of clamping columns slide relatively with the fixed circular ring plate. A return spring is installed between the fixed circular ring plate and the clamping column. The pressure column and the sealing cylinder slide relatively.

[0010] The clamping component further includes a plurality of locking screw groove columns arranged circumferentially. A plurality of fixing plates are fixedly connected to the outside of the sealing head. The fixing plates are rotatably connected with the locking screw groove columns. A plurality of clamping plates are rotatably connected to the bottom of the air outlet groove plate. The clamping plates are in clamping and sliding connection with the locking screw groove columns.

[0011] A plurality of sealing rings are installed in the installation flange, and the sealing rings are in close contact with the pressure column.

[0012] A pneumatic component for reciprocating movement of a plurality of clamping columns is arranged on the gas intake. The pneumatic component includes a first pipeline, which is fixed outside the gas intake. A fifth pipeline is also fixedly connected to the gas intake on one side of the first pipeline. A third pipeline is fixedly connected between the first pipeline and the fifth pipeline. A second detection unit is installed on the third pipeline.

[0013] A second pipeline and a fourth pipeline are respectively fixedly connected to the outside of the sealing cylinder. A first electric three-way valve is installed at the connection of the second pipeline, the first pipeline and the third pipeline. A second electric three-way valve is installed at the connection of the fifth pipeline, the fourth pipeline and the fourth pipeline.

[0014] The seal detection mechanism further includes a seal motor, which is installed at the top of the gas intake port. The output end of the seal motor is fixedly connected with a seal driving gear. The outer end of the seal plate extending to the outside of the gas intake port is fixedly connected with a seal driven gear. A seal tooth ring is fixedly connected to the outside of the gas intake port. The seal tooth ring meshes with a plurality of seal driven gears. A seal tooth circle is fixedly connected to the outside of the seal tooth ring. The seal tooth circle meshes with the seal driving gear.

[0015] The present invention has the following beneficial effects: In the present invention, when the pressure in the gas intake port is too high, the flow rate of the gas flowing through the second detection unit becomes faster. At this time, the second detection unit transmits a signal through the relevant control system to drive the pressing column to drive the sealing head to move downward, blocking the gas outlet of the gas outlet groove plate. At the same time, the provided clamping assembly further strengthens the pressing column, and the provided clamping assembly clamps the sealing head to ensure the stability of the blocking process.

[0016] In the present invention, when the sealing head is blocking, the control system simultaneously controls the angle of the seal plate, reducing the outlet of the gas intake port. At this time, the escaping gas has an increased flow rate due to the reduced outlet of the gas intake port. The first detection unit feeds back to the control system by detecting the flow rate change of the escaping gas, and the control system further drives the sealing head to move downward until the first detection unit does not detect gas flow. Such feedback control can further ensure the sealing performance of the blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of a controllable plugging device for a gas intake wellhead proposed by the present invention; Figure 2 It is a schematic diagram of the overall internal structure of the gas intake port, installation cylinder and seal cylinder in the present invention; Figure 3 It is a schematic diagram of the structure of the seal detection mechanism in the present invention; Figure 4 It is a front view structure schematic diagram of the controllable plugging mechanism in the present invention; Figure 5 It is a top view structure schematic diagram of the controllable plugging mechanism in the present invention; Figure 6 It is a schematic diagram of the structure of the sealing head and the clamping plate in the present invention; Figure 7 It is a front view structure schematic diagram of the pneumatic component and the clamping component in the present invention; Figure 8 It is a rear view structure schematic diagram of the pneumatic component and the clamping component in the present invention Figure 9 is Figure 4 a schematic enlarged view of the structure at A in

[0018] In the figure: 1, gas intake port; 10, air outlet groove plate; 2, installation cylinder; 3, sealing cylinder; 4, sealing plate; 5, first pipeline; 20, screw rod; 21, sleeve; 22, sliding tooth; 23, lifting driving gear; 24, lifting motor; 30, pressing column; 31, clamping column; 32, return spring; 33, fixed circular ring plate; 40, sealing motor; 41, sealing driving gear; 42, sealing gear ring; 43, sealing tooth ring; 44, sealing driven gear; 45, first detection unit; 51, second pipeline; 52, third pipeline; 54, second detection unit; 53, fourth pipeline; 55, fifth pipeline; 56, first electric three-way valve; 57, second electric three-way valve; 6, installation flange; 60, sealing ring; 61, sealing head; 62, fixing plate; 63, locking screw groove column; 65, sealing gasket; 66, clamping plate; Specific implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0020] As Figures 1 - 9 shown, a controllable plugging device for a gas production wellhead proposed by the present invention includes a gas intake port 1. An air outlet groove plate 10 is fixedly connected to the inner side of the gas intake port 1. A controllable plugging mechanism is installed on the gas intake port 1. The controllable plugging mechanism includes a clamping component and a clamping component. The clamping component includes a pressing column 30. The pressing column 30 can move up and down. A plurality of reciprocatingly movable clamping columns 31 are equidistantly arranged on the outer side of the pressing column 30. The clamping columns 31 are engaged with the grooves formed on the outer side of the pressing column 30; The clamping component includes a sealing head 61. The sealing head 61 is fixedly arranged at the bottom of the pressing column 30. A plurality of clamping plates 66 are rotatably arranged on the inner side of the gas intake port 1. The plurality of clamping plates 66 are used to clamp the sealing head 61. The sealing head 61 is used to plug the air outlet groove plate 10; A sealing detection mechanism is further arranged on the gas intake port 1. The sealing detection mechanism includes a first detection unit 45. A plurality of sealing plates 4 are rotatably arranged between the first detection unit 45 and the gas intake port 1. The angles between the sealing plates 4 are adjustable. The plurality of sealing plates 4 are used to assist the first detection unit 45 in detecting escaping gas; Further, when the pressure in the gas intake port 1 is too high, the flow rate through the first pipe 5 also increases accordingly. At this time, the flow rate signal detected by the second detection unit 54 becomes larger. When it exceeds the warning value, the external control system receives the relevant signal, processes it through signal amplification, filtering, etc., and sends it to the actuator. At this time, the third pipe 52 is closed, and the gas does not pass through the third pipe 52. Further, since the gas does not pass through the third pipe 52, the second detection unit 54 stops working at this time. The first detection unit 45 is set to transmit signals to the control system. At this time, the control system controls the lifting motor 24 to drive the lifting drive gear 23 to rotate, and the lifting drive gear 23 drives the pressing column 30 to move downward.

[0021] Further, since the third pipe 52 is closed, the gas enters the second pipe 51 through the first pipe 5, and then enters the inside of the sealing cylinder 3 through the second pipe 51. By inflating the sealing cylinder 3, a plurality of clamping columns 31 clamp the grooves formed on the pressing column 30.

[0022] Further, while the pressing column 30 drives the sealing column 61 to move downward, the sealing column 61 is used to block the gas outlet of the gas outlet groove plate 10. At this time, the locking screw groove column 63 moves downward to drive the clamping plate 66 to rotate, realizing the clamping of the sealing head 61, and further ensuring the sealing performance of the blockage.

[0023] Further, when the sealing column 61 starts to block the gas outlet of the gas outlet groove plate 10, there is still a small amount of gas escaping. At this time, the control system controls the sealing detection mechanism, and a plurality of set sealing plates 4 are flipped at an angle so that the plurality of 4 form a flat plate as a whole. At this time, the first detection unit 45 at the center detects the gas flow at the escape point in the gas intake port 1, and feeds the detected signal back to the control system. The control system further drives the engaging assembly and the clamping assembly to move to ensure the blocking effect until the first detection unit 45 detects that no gas is escaping.

[0024] The top of the gas intake port 1 is fixedly connected with a mounting flange 6. The top of the mounting flange 6 is flange-connected with a sealing cylinder 3. The top of the sealing cylinder 3 is fixedly connected with a mounting cylinder 2. A sealing gasket 65 is installed on the top of the gas outlet groove plate 10.

[0025] A driving assembly is arranged in the mounting cylinder 2. The driving assembly includes a screw rod 20. The screw rod 20 is threadedly connected with the mounting cylinder 2. The bottom of the screw rod 20 is rotatably connected with the pressing column 30. The top of the pressing column 30 is fixed with a sleeve 21 arranged outside the screw rod 20. The top of the sleeve 21 is rotatably connected with a sliding tooth 22. The sliding tooth 22 engages and slides with the screw rod 20. A lifting motor 24 is fixedly connected to the side surface of the sleeve 21. The output end of the lifting motor 24 is fixedly connected to a lifting driving gear 23, and the lifting driving gear 23 meshes with the sliding tooth 22; Further, the control system starts the lifting motor 24 to drive the lifting driving gear 23 to rotate. The lifting driving gear 23 drives the sliding tooth 22 to rotate around its own axis. A card slot is provided on the outer side of the screw rod 20. The card slot and the sliding tooth 22 slide relative to each other, restricting relative rotation between the two, but allowing the screw rod 20 to axially slide. The screw rod 20 is threadedly connected to the installation cylinder 2, converting the rotational motion into the axial movement of the screw rod 20. The screw rod 20 moves downward along the installation cylinder 2, pushing the pressing column 30 to press down synchronously, realizing the plugging action.

[0026] The engaging component further includes a fixed circular ring plate 33. A plurality of notches are equidistantly arranged on the outer circumference of the pressing column 30. The fixed circular ring plate 33 is arranged on the outer side of the pressing column 30 and is fixedly connected to the sealing cylinder 3. A plurality of clamping columns 31 slide relative to the fixed circular ring plate 33. A return spring 32 is installed between the fixed circular ring plate 33 and the clamping column 31, and the pressing column 30 and the sealing cylinder 3 slide relative to each other; Further, after the gas enters the sealing cylinder 3, the control system closes the opening and closing by driving the first electric three-way valve 56 and the second electric three-way valve 57, so that the first pipeline 5 is only communicated with the second pipeline 51, and the third pipeline 52 is only communicated with the fifth pipeline 55. At this time, the sealing cylinder 3 is in a closed state. The gas drives the clamping column 31 to move towards the pressing column 30 until the groove provided on the outer side of the pressing column 30 is flush with the clamping column 31. At this time, the clamping column 31 is inserted into the pressing column 30. At the same time, the return spring 32 extends to generate a restoring force. The heads of the clamping column 31 and the inner part of the groove are both spherical in design. Therefore, during the downward movement of the pressing column 30, the clamping column 31 will successively engage with the groove.

[0027] The clamping component further includes a plurality of locking screw groove columns 63 arranged circumferentially. A plurality of fixing plates 62 are fixedly connected to the outer side of the sealing head 61. The fixing plates 62 are rotatably connected to the locking screw groove columns 63. The bottom of the air outlet groove plate 10 is rotatably connected to a plurality of clamping plates 66, and the clamping plates 66 engage and slide with the locking screw groove columns 63; Further, the sealing head 61 will move downward following the pressing column 30. At the same time, the downward movement of the sealing head 61 drives the plurality of fixing plates 62 to move synchronously. While the fixing plates 62 move downward, a plurality of thread grooves are provided on the outer side of the locking screw groove column 63, and the thread grooves are attached to the circular protrusions fixed inside the clamping plates 66. At this time, the clamping plates 66 rotate to clamp the sealing head 61. The lower the sealing head 61 moves, the more clamping columns 31 engage with the pressing column 30, and the larger the rotation angle of the clamping plates 66, the tighter the clamping of the sealing head 61.

[0028] A plurality of sealing rings 60 are installed inside the mounting flange 6, and the sealing rings 60 are in close contact with the pressing column 30.

[0029] A pneumatic assembly for reciprocating movement of a plurality of clamping columns 31 is provided on the gas extraction port 1. The pneumatic assembly includes a first pipeline 5. The first pipeline 5 is fixed outside the gas extraction port 1. A fifth pipeline 55 is also fixedly connected to the gas extraction port 1 on one side of the first pipeline 5. A third pipeline 52 is fixedly connected between the first pipeline 5 and the fifth pipeline 55. A second detection unit 54 is installed on the third pipeline 52. A second pipeline 51 and a fourth pipeline 53 are respectively fixedly connected to the outside of the sealing cylinder 3. A first electric three-way valve 56 is installed at the connection of the second pipeline 51, the first pipeline 5 and the third pipeline 52. A second electric three-way valve 57 is installed at the connection of the fifth pipeline 55, the fourth pipeline 53 and the fourth pipeline 53. Further, during the stage of inflating the sealing cylinder 3, at this time, only the first pipeline 5 is connected to 51, at this time the gas does not pass through 52, at this time the connection between 53 and 55 and 52 is closed, at this time the sealing cylinder 3 is in the sealing stage, and this process is all realized by the first electric three-way valve 56 and the second electric three-way valve 57.

[0030] Further, after the plugging is completed, by controlling the opening and closing of the first electric three-way valve 56 and the second electric three-way valve 57, the gas in the sealing cylinder 3 is discharged.

[0031] The seal detection mechanism further includes a seal motor 40. The seal motor 40 is installed on the top of the gas extraction port 1. The output end of the seal motor 40 is fixedly connected to a seal driving gear 41. The end of the seal plate 4 extending outside the gas extraction port 1 is fixedly connected to a seal driven gear 44. A seal gear ring 43 is fixedly connected to the outside of the gas extraction port 1. The seal gear ring 43 meshes with a plurality of seal driven gears 44. A seal gear 42 is fixedly connected to the outside of the seal gear ring 43. The seal gear 42 meshes with the seal driving gear 41. Further, start the sealing motor 40 to drive the synchronous rotation of the sealing driving gear 41. The sealing driving gear 41 meshes with the sealing gear ring 42 to transmit the rotational power to the sealing gear ring 42. The sealing gear ring 42 rotates synchronously with the rotation of the sealing driving gear 41. Since the sealing gear ring 42 is fixedly connected to the outer side of the sealing gear ring 43, the rotation of the sealing gear ring 42 directly drives the synchronous rotation of the sealing gear ring 43. The inner side of the sealing gear ring 43 meshes with a plurality of sealing driven gears 44 to transmit the rotational power to the sealing driven gears 44. Each sealing driven gear 44 rotates synchronously with the rotation of the sealing gear ring. The sealing driven gears 44 are fixedly connected to the ends of the sealing plate 4. Therefore, the rotation of the sealing driven gears directly drives the movement of the sealing plate. The sealing plate 4 flips with the rotation of the sealing driven gears 44 to open or close the gas intake port. At this time, the diameter of the gas intake port becomes smaller, and the gas flow rate at the escape point becomes larger. The first detection unit 45 can further detect whether there is gas escaping.

[0032] In this embodiment, when the pressure in the gas intake port 1 is too high, the flow rate in the first pipeline 5 increases. After the second detection unit 54 detects that the flow rate signal exceeds the warning value, the peripheral control system receives the signal and processes it, controlling the third pipeline 52 to close and blocking the gas flow. At this time, the second detection unit 54 stops working, and the first detection unit 45 transmits a signal to the control system. The control system drives the lifting motor 24 to rotate, driving the pressure column 30 to move downward through the lifting driving gear 23. Since the third pipeline 52 is closed, the gas enters the sealing cylinder 3 through the first pipeline 5 and the second pipeline 51 to be inflated, causing the clamping column 31 to engage with the groove of the pressure column 30. The pressure column 30 drives the sealing column 61 to move downward to block the air outlet of the air outlet groove plate 10. The locking screw groove column 63 drives the clamping plate 66 to rotate to clamp the sealing column 61, enhancing the sealing performance of the blockage. If there is a small amount of gas escaping at the initial stage of the blockage, the control system starts the sealing detection mechanism, causing the plurality of sealing plates 4 to flip to form a flat plate as a whole. The first detection unit 45 at the center detects the escaping gas and feeds back the signal to the control system, driving the engaging assembly and the clamping assembly to further adjust until the first detection unit 45 detects no gas escaping, ensuring the blockage effect.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A controllable plugging device for a gas production wellhead, comprising a gas production port (1), characterized in that, An air intake groove plate (10) is fixedly connected to the inner side of the gas intake port (1). A controllable plugging mechanism is installed on the gas intake port (1). The controllable plugging mechanism includes a clamping component and a clamping component. The clamping component includes a pressure column (30). The pressure column (30) can move up and down. A plurality of reciprocatingly movable clamping columns (31) are equidistantly arranged on the outer side of the pressure column (30). The clamping columns (31) are engaged with grooves formed on the outer side of the pressure column (30). The clamping component includes a sealing head (61). The sealing head (61) is fixedly arranged at the bottom of the pressure column (30). A plurality of clamping plates (66) are rotatably arranged inside the gas intake port (1). The plurality of clamping plates (66) are used to clamp the sealing head (61). The sealing head (61) is used to plug the air intake groove plate (10). A sealing detection mechanism is further arranged on the gas intake port (1). The sealing detection mechanism includes a first detection unit (45). A plurality of sealing plates (4) are rotatably arranged between the first detection unit (45) and the gas intake port (1). The angles between the sealing plates (4) are adjustable. The plurality of sealing plates (4) are used to assist the first detection unit (45) in detecting escaping gas.

2. The controllable plugging device for a gas production wellhead according to claim 1, characterized in that, An installation flange (6) is fixedly connected to the top of the gas intake port (1). The top of the installation flange (6) is flange-connected to a sealing cylinder (3). The top of the sealing cylinder (3) is fixedly connected to an installation cylinder (2). A sealing gasket (65) is installed on the top of the air intake groove plate (10).

3. The controllable plugging device for a gas production wellhead according to claim 2, characterized in that, A driving component is arranged inside the installation cylinder (2). The driving component includes a screw rod (20). The screw rod (20) is threadedly connected to the installation cylinder (2). The bottom of the screw rod (20) is rotatably connected to the pressure column (30). A sleeve (21) arranged on the outer side of the screw rod (20) is fixed to the top of the pressure column (30). A sliding tooth (22) is rotatably connected to the top of the sleeve (21).

4. The controllable plugging device for a gas production wellhead according to claim 3, characterized in that, The sliding tooth (22) is engaged and slid with the screw rod (20). A lifting motor (24) is fixedly connected to the side of the sleeve (21). An output end of the lifting motor (24) is fixedly connected to a lifting driving gear (23). The lifting driving gear (23) is meshed with the sliding tooth (22).

5. A controllable plugging device for a gas production wellhead according to claim 1, characterized in that, The clamping component further includes a fixed circular ring plate (33). A plurality of notches are equidistantly formed on the outer circumference of the pressure column (30). The fixed circular ring plate (33) is arranged on the outer side of the pressure column (30) and is fixedly connected to the sealing cylinder (3). The plurality of clamping columns (31) slide relative to the fixed circular ring plate (33). A return spring (32) is installed between the fixed circular ring plate (33) and the clamping columns (31). The pressure column (30) slides relative to the sealing cylinder (3).

6. The controllable plugging device for a gas production wellhead according to claim 1, characterized in that, The clamping assembly further includes a plurality of locking screw groove columns (63) arranged circumferentially. A plurality of fixing plates (62) are fixedly connected to the outer side of the sealing head (61). The fixing plates (62) are rotatably connected to the locking screw groove columns (63). A plurality of clamping plates (66) are rotatably connected to the bottom of the air outlet groove plate (10). The clamping plates (66) are engaged and slidable with the locking screw groove columns (63).

7. The controllable plugging device for a gas production wellhead according to claim 2, characterized in that, A plurality of sealing rings (60) are installed in the mounting flange (6). The sealing rings (60) are in close contact with the pressure column (30).

8. The controllable plugging device for a gas production wellhead according to claim 2, wherein The gas intake port (1) is provided with a pneumatic assembly for the reciprocating movement of a plurality of clamping columns (31). The pneumatic assembly includes a first pipe (5). The first pipe (5) is fixed to the outside of the gas intake port (1). The gas intake port (1) is further fixedly connected with a fifth pipe (55) on one side of the first pipe (5). A third pipe (52) is fixedly connected between the first pipe (5) and the fifth pipe (55). A second detection unit (54) is installed on the third pipe (52).

9. The controllable plugging device for a gas production wellhead according to claim 8, wherein, A second pipe (51) and a fourth pipe (53) are respectively fixedly connected to the outside of the sealing cylinder (3). A first electric three-way valve (56) is installed at the connection of the second pipe (51), the first pipe (5) and the third pipe (52). A second electric three-way valve (57) is installed at the connection of the fifth pipe (55), the fourth pipe (53) and the fourth pipe (53).

10. A controllable plugging device for a gas production wellhead according to claim 1, characterized in that, The seal detection mechanism further includes a seal motor (40). The seal motor (40) is installed on the top of the gas intake port (1). The output end of the seal motor (40) is fixedly connected with a seal driving gear (41). The end of the sealing plate (4) extending to the outside of the gas intake port (1) is fixedly connected with a seal driven gear (44). A seal tooth ring (43) is fixedly connected to the outside of the gas intake port (1). The seal tooth ring (43) is meshed with a plurality of seal driven gears (44). A seal tooth circle (42) is fixedly connected to the outside of the seal tooth ring (43). The seal tooth circle (42) is meshed with the seal driving gear (41).

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