175MPa gas production wellhead device

Abstract

The invention relates to the technical field of oil field fracturing gas production, in particular to a 175MPa gas production wellhead device which comprises an isolation cavity, an upper connecting pipe, a lower connecting pipe, a communicating assembly, a pressure sensor, a humidity sensor, an integrated controller, a sealing assembly and a power assembly, and the upper connecting pipe and the lower connecting pipe are connected to the upper end and the lower end of the isolation cavity respectively through flanges. The pressure sensor, the humidity sensor and the integrated controller are all installed on the periphery of the isolation cavity. By guiding underground natural gas to form the constant-pressure gas cavity in the wellhead sealing assembly and utilizing the mode that the constant-pressure gas cavity assists in pushing the wellhead sealing seat to horizontally move from the side face, the problems that when wellhead gas production control packing is carried out on higher-pressure underground natural gas, a high-power driving mechanism needs to be adopted for horizontally applying pressure to the wellhead sealing seat, and the sealing effect is poor are solved. And the sealing effect of the gas production wellhead is influenced by the abrasion of the wellhead sealing seat due to overlarge stress.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield fracturing gas production, in particular to a 175MPa gas production wellhead device. BACKGROUND

[0002] China has abundant natural gas resources. The exploitation of natural gas resources generally requires drilling a well first, and then installing a gas production wellhead device with a packer control system at the wellhead to open, control and guide the natural gas in the pipeline that gushes into the subsea Christmas tree. In addition, subsea oil and gas production equipment and other deep-sea oil drilling equipment and gas wells need to be regularly maintained and have damaged parts replaced. To ensure safety during operation, before any operation that requires disassembling the components above the wellhead, the wellhead and the external gas transmission pipeline need to be sealed by controlling the gas production wellhead device. Therefore, the sealing performance of the gas production wellhead device directly affects the sealing effect. With the increase of exploitation depth, 175MPa pressure wellheads have begun to appear gradually. However, the existing gas production wellhead devices are generally designed for 140MPa or lower pressure environments. If these devices are directly applied to 175MPa pressure environments, the sealing effect may not be satisfactory.

[0003] Therefore, a 175MPa gas production wellhead device is proposed. SUMMARY

[0004] The present application aims to provide a 175MPa gas production wellhead device, which solves the problem that when controlling and sealing the natural gas in a higher pressure well, the sealing seat needs to be subjected to a large horizontal force due to the high pressure of the natural gas in the well, which not only requires a high-power driving mechanism, but also is prone to wear and tear after a period of use, affecting the sealing effect of the gas production wellhead. By guiding the natural gas in the well to form an isobaric gas cavity in the wellhead sealing assembly, and using the isobaric gas cavity to assist in pushing the wellhead sealing seat horizontally, the need for a high-power driving mechanism to push the wellhead sealing seat horizontally is eliminated, the pressure load on the wellhead sealing seat is effectively reduced, the degree of wear and tear is reduced, and the sealing effect of the wellhead is improved and the service life of the wellhead is extended.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A 175MPa gas production wellhead device includes an isolation chamber, an upper connecting pipe, and a lower connecting pipe. The upper and lower connecting pipes are connected to the upper and lower ends of the isolation chamber via flanges, respectively. The device also includes a communication assembly, a pressure sensor, a humidity sensor, an integrated controller, a wellhead sealing assembly, and a power assembly. The pressure sensor, humidity sensor, and integrated controller are all installed on the outer periphery of the isolation chamber. Two sets of wellhead sealing assemblies are symmetrically arranged and fitted onto the outer periphery of the upper and lower connecting pipes. The communication assembly connects the two sets of wellhead sealing assemblies, and the gas inlet end of the communication assembly is sealed to the lower connecting pipe. The four sets of... The power components are symmetrically arranged on the surfaces of the two sets of wellhead sealing components, and the power components are connected to the wellhead sealing components. The integrated controller is connected to the communication component, pressure sensor, humidity sensor and power components respectively. The integrated controller adjusts the opening and closing of the corresponding part of the communication component according to the feedback value of the pressure sensor. The opening part of the communication component introduces gas into the corresponding wellhead sealing component, thereby assisting the power component to drive the wellhead sealing component to close. When the pressure value of the pressure sensor decreases and remains unchanged, the integrated controller adjusts the power component to close the other wellhead sealing component.

[0007] Preferably, the connecting component includes a straight pipe, a fitting pipe, and a main control valve. The two fitting pipes are respectively connected to two sets of sealing components. The straight pipe is connected between the two fitting pipes. The main control valve is installed between the lower fitting pipe and the lower connecting pipe.

[0008] Preferably, the fitting tube includes a solenoid valve, an arc-shaped tube, and a connector. One end of the arc-shaped tube is fitted with a connector, which is sealed to the end of the sealing component. The other end of the arc-shaped tube is connected to the other end of the straight tube and to the end of the straight tube. The solenoid valve is installed at the connection point of the arc-shaped tube near the end of the straight tube.

[0009] Preferably, the sealing component includes a fitting frame, a limiting groove, and a wellhead sealing seat. The two fitting frames are respectively sealed and fitted onto the outer periphery of the upper connecting pipe or the outer periphery of the lower connecting pipe. The limiting groove is disposed inside the fitting frame. The two wellhead sealing seats are respectively slidably disposed in the limiting grooves of the two fitting frames, and the wellhead sealing seats are connected to the power component for transmission.

[0010] Preferably, the adjacent sides of the wellhead sealing seats are both configured as vertical contact surfaces, and the sidewalls of the wellhead sealing seats are provided with grooves located on the vertical contact surfaces. A first bonding piece and a second bonding piece are respectively provided in the two grooves. The opposite sides of the wellhead sealing seats are both provided with arc-shaped side surfaces. When the wellhead sealing seats move into the corresponding connecting pipe, the high-pressure air acts on the arc-shaped side surfaces to keep the top of the wellhead sealing seats in sliding contact with the inner top surface of the bonding frame. When the vertical contact surfaces of the two wellhead sealing seats are in contact, the first bonding piece and the second bonding piece slide along the corresponding grooves and are tightly bonded.

[0011] Preferably, the first bonding piece includes a first magnetic sheet, a first magnetic strip, a first buffer sheet, a convex strip, and a limiting rod. The first magnetic sheet is slidably disposed in the groove, the first magnetic strip is bonded and fixed in the groove, and the first magnetic strip and the first magnetic sheet remain adsorbed and bonded without the action of external magnetic force. The first buffer sheet is bonded to the side of the first magnetic sheet away from the first magnetic strip, the convex strip is bonded to the side of the first buffer sheet away from the first magnetic strip, and the limiting rod passes through the convex strip, the first buffer sheet, the first magnetic strip, and the first magnetic sheet, and the end of the limiting rod is connected to the wellhead sealing seat.

[0012] Preferably, the second bonding piece includes a second buffer sheet, a buffer groove, a second magnetic sheet, and a second magnetic strip. The second buffer sheet is bonded to the side of the second magnetic sheet near the first magnetic sheet. The buffer groove is constructed on the side of the second buffer sheet near the first buffer sheet and is adapted to the convex strip. The second magnetic sheet is slidably disposed in the sliding groove, and the second magnetic strip is fixedly bonded to the corresponding sliding groove. The magnetic force between the first magnetic sheet and the second magnetic sheet is greater than the attraction force between the first magnetic sheet and the first magnetic strip and the attraction force between the second magnetic sheet and the second magnetic strip.

[0013] Preferably, the power assembly includes a sealing frame, a sealing cover, a screw, and a limiting block. The sealing frame is sealed and installed on the top of the fitting frame, the sealing cover is sealed and installed on the end of the sealing frame, and an explosion-proof motor is installed inside the sealing cover. The screw is rotatably installed inside the sealing frame, and the end of the screw is connected to the output shaft of the explosion-proof motor. The limiting block is installed on the top edge of the wellhead sealing seat, and the limiting block is threadedly connected to the screw. The top and both sides of the limiting block are slidably fitted with the sealing frame.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. This invention is applied to wellhead sealing operations at 175MPa pressure. When the components above the wellhead need to be disassembled for regular maintenance or replacement of damaged parts of the gas well, by switching the main control valve to the open state, high-pressure gas can be guided through the connecting component into the interior of the wellhead sealing component and horizontally push the wellhead sealing seat to move towards the inner side of the corresponding connecting pipe. This allows the use of a smaller power component and effectively reduces the load on the wellhead sealing seat caused by higher gas pressure, thereby effectively reducing the wear of the wellhead sealing component during a single closure process. This not only ensures the sealing performance of the wellhead sealing component for a long time, but also significantly extends the service life of the wellhead sealing component.

[0016] 2. With the wellhead sealing component, as the wellhead sealing seat gradually moves to the inner side of the corresponding connecting pipe, the high-pressure gas acting on the arc-shaped side after it enters the inner side of the connecting pipe will exert a certain horizontal thrust on the wellhead sealing seat. This reduces the power requirement of the power component. In addition, under the action of the arc-shaped side, the semi-circular top surface of the wellhead sealing seat can be kept in contact with the inner top surface of the fitting frame, thus fully ensuring the sealing performance of the wellhead sealing component during operation, and thus fully ensuring the sealing effect when applied to a 175MPa gas production wellhead.

[0017] 3. With the wellhead sealing seat, the first bonding piece, and the second bonding piece, when two wellhead sealing seats in the same wellhead sealing assembly are bonded together under the action of high-pressure air and power components, the first bonding piece and the second bonding piece slide horizontally along the slide groove and approach each other. When the convex strip moves into the buffer groove, a "horizontal bridge" can be formed between the two wellhead sealing seats, which can further improve the stability of the two wellhead sealing seats after bonding. In addition, when the vertical bonding surface is worn to a certain extent, the sealing effect between the two wellhead sealing seats can be fully guaranteed through the cooperation of the convex strip and the buffer groove. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the connecting pipe fitting of the present invention;

[0020] Figure 3 This is a schematic diagram of the wellhead sealing assembly of the present invention;

[0021] Figure 4 This is a schematic diagram of the connection between the wellhead sealing seat and the screw rod of the present invention;

[0022] Figure 5 This is a schematic diagram of the wellhead sealing seat of the present invention;

[0023] Figure 6 This is a schematic diagram of the bonding frame of the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of the first bonding sheet and the second bonding sheet of the present invention;

[0025] Figure 8 This is a schematic diagram illustrating the state changes of the wellhead sealing component of the present invention.

[0026] In the diagram: 1. Isolation chamber; 2. Upper connecting pipe; 3. Connecting assembly; 31. Straight pipe; 32. Fitting pipe; 321. Solenoid valve; 322. Arc-shaped pipe; 323. Connector; 33. Main control valve; 4. Pressure sensor; 5. Humidity sensor; 6. Integrated controller; 7. Wellhead sealing assembly; 71. Fitting frame; 72. Limiting groove; 73. Wellhead sealing seat; 731. First fitting piece; 7311. First magnetic piece; 7312. 7313 First magnetic strip; 7314 First buffer sheet; 7315 Raised strip; 7316 Limiting rod; 732 Vertical contact surface; 733 Sliding groove; 734 Arc-shaped side surface; 735 Second bonding sheet; 7351 Second buffer sheet; 7352 Buffer groove; 7353 Second magnetic sheet; 7354 Second magnetic strip; 8. Power assembly; 81. Sealing frame; 82. Sealing cover; 83. Screw; 84. Limiting block; 9. Lower connecting pipe. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1 to 8 This invention provides a 175MPa gas production wellhead device, the technical solution of which is as follows:

[0029] Reference Figure 1A 175MPa gas production wellhead device includes an isolation chamber 1, an upper connecting pipe 2, and a lower connecting pipe 9. The upper connecting pipe 2 and the lower connecting pipe 9 are connected to the upper and lower ends of the isolation chamber 1 respectively via flanges. It also includes a connecting assembly 3, a pressure sensor 4, a humidity sensor 5, an integrated controller 6, a wellhead sealing assembly 7, and a power assembly 8. The pressure sensor 4, humidity sensor 5, and integrated controller 6 are all installed on the outer periphery of the isolation chamber 1. The detection parts of the pressure sensor 4 and humidity sensor 5 extend to the inner side of the isolation chamber 1. Two sets of wellhead sealing assemblies 7 are symmetrically arranged and fitted onto the outer periphery of the upper connecting pipe 2 and the lower connecting pipe 9, respectively. Each wellhead sealing assembly 7 is installed around the outer periphery of the connecting pipe 9. Each set of wellhead sealing assemblies 7 is symmetrically arranged about the central axis of the isolation chamber 1 and fitted onto the outer periphery of the upper connecting pipe 2 or the lower connecting pipe 9. The end of the pressure sensor 4 extends to the mid-plane of the two sets of wellhead sealing assemblies 7, thereby accurately detecting the pressure of the high-pressure gas flowing through the wellhead sealing assemblies 7, so that the integrated controller 6 can perform corresponding operations. The connecting assembly 3 is connected between the two sets of wellhead sealing assemblies 7, and the air inlet of the connecting assembly 3 is sealed to the lower connecting pipe 9. When the connection between the connecting assembly 3 and the lower connecting pipe 9 is open, the high-pressure gas in the lower connecting pipe 9 is introduced into the two sets of wellhead sealing assemblies. At the end of component 7, high-pressure gas applies a horizontal thrust to the wellhead sealing component 7. Four sets of power components 8 are symmetrically arranged in pairs on the surfaces of two sets of wellhead sealing components 7, and the power components 8 are connected to the wellhead sealing components 7 via transmission. The power components 8 are conventional power mechanisms. Since high-pressure gas applies a horizontal thrust from the end of the wellhead sealing component 7, the power of the power components 8 can be set to be relatively small, thereby reducing the size of the power components 8 and allowing the use of explosion-proof motors with smaller operating power. The integrated controller 6 is connected to the connecting component 3, pressure sensor 4, humidity sensor 5, and power components 8, and the integrated controller 6 is connected to the pressure sensor 4. The feedback value corresponds to the opening and closing of the corresponding part of the connecting component 3. The connecting part of the connecting component 3 introduces gas into the corresponding wellhead sealing component 7, thereby the auxiliary power component 8 drives the wellhead sealing component 7 to close. When the pressure value of the pressure sensor 4 decreases and remains unchanged, the integrated controller 6 adjusts the power component 8 to close the other wellhead sealing component 7. When neither set of wellhead sealing components 7 has failed, after one set of wellhead sealing components 7 is closed, the other set of wellhead sealing components 7 is closed. Since the wellhead sealing component 7 that is closed first has blocked the high-pressure gas, the wellhead sealing component 7 that is closed later is no longer affected by the high-pressure gas and can be easily closed.

[0030] Reference Figure 1 and Figure 2In one embodiment of the present invention, the connecting component 3 specifically includes a straight pipe 31, a fitting pipe 32, and a main control valve 33. The two fitting pipes 32 are respectively connected to two sets of wellhead sealing components 7. The straight pipe 31 is connected between the two fitting pipes 32. The main control valve 33 is installed between the lower fitting pipe 32 and the lower connecting pipe 9. The middle part of the fitting pipe 32 is connected to the end of the straight pipe 31 through a connector. When the main control valve 33 is switched to the open state, the high-pressure gas introduced into the straight pipe 31 will flow directly from the middle part of the fitting pipe 32 to both ends of the fitting pipe 32, or flow from the middle part of the fitting pipe 32 to both ends of the fitting pipe 32 after passing through the straight pipe 31. When it is not necessary to seal the isolation chamber 1 or when the isolation chamber 1 is already sealed, the main control valve 33 is in the closed state.

[0031] Reference Figure 2 In one embodiment of the present invention, the bonding tube 32 specifically includes a solenoid valve 321, an arc-shaped tube 322, and a connector 323. One end of the arc-shaped tube 322 is equipped with a connector 323. Both the arc-shaped tube 322 and the connector 323 are made of high-strength materials, and the contact part between the connector 323 and the bonding frame 71 is specially sealed to ensure the sealing between the bonding tube 32 and the bonding frame 71. The connector 323 is sealed to the end of the wellhead sealing component 7. The other end of the arc-shaped tube 322 is connected to each other and to the end of the straight tube 31. The solenoid valve 321 is installed at the connection point of the arc-shaped tube 322 near the end of the straight tube 31. The solenoid valve 321 in the lower bonding tube 32 is used to control the opening and closing of the straight tube 31, and the solenoid valve 321 in the upper bonding tube 32 is used to control the opening and closing of the upper arc-shaped tube 322, so that even if the lower wellhead sealing component 7 fails, the upper wellhead sealing component 7 can still be smoothly closed.

[0032] Reference Figure 3 and Figure 6 As one embodiment of the present invention, specifically, the wellhead sealing assembly 7 includes a fitting frame 71, a limiting groove 72, and a wellhead sealing seat 73. The two fitting frames 71 are respectively sealed and fitted onto the outer periphery of the upper connecting pipe 2 or the outer periphery of the lower connecting pipe 9. The end of the fitting frame 71 is semi-circular to maintain a tight fit with the upper connecting pipe 2 or the lower connecting pipe 9. The limiting groove 72 is disposed inside the fitting frame 71. The two wellhead sealing seats 73 are respectively slidably disposed in the limiting grooves 72 of the two fitting frames 71, and the wellhead sealing seats 73 are connected to the power assembly 8 for transmission. The side view cross section of the wellhead sealing seat 73 is inverted L-shaped, and the top view cross section of the wellhead sealing seat 73 is semi-circular. The two wellhead sealing seats 73 have the same shape and size.

[0033] Reference Figure 4 and Figure 5In one embodiment of the present invention, specifically, the adjacent surfaces of the wellhead sealing seats 73 are all provided with vertical contact surfaces 732. When the two wellhead sealing seats 73 are in contact, the vertical contact surfaces 732 are in contact with each other. The sidewall of the wellhead sealing seat 73 is provided with a sliding groove 733 located on the vertical contact surface 732. The first contact piece 731 and the second contact piece 735 are respectively provided in the two sliding grooves 733. That is, the first contact piece 731 and the second contact piece 735 are respectively provided with On the two wellhead sealing seats 73, an arc-shaped side surface 734 is provided on the side of the wellhead sealing seats 73 that is far apart from each other. When the wellhead sealing seats 73 move into the corresponding connecting pipe, the high pressure acts on the arc-shaped side surface 734 to keep the top of the wellhead sealing seat 73 slidingly attached to the inner top surface of the fitting frame 71. When the vertical contact surfaces 732 of the two wellhead sealing seats 73 are attached, the first contact piece 731 and the second contact piece 735 slide along the corresponding sliding groove 733 and fit tightly together.

[0034] Reference Figure 5 and Figure 7 In one embodiment of the present invention, the first bonding piece 731 specifically includes a first magnetic sheet 7311, a first magnetic strip 7312, a first buffer sheet 7313, a protrusion 7314, and a limiting rod 7315. The first magnetic sheet 7311 is slidably disposed in the slide groove 733, and the first magnetic strip 7312 is bonded and fixed in the slide groove 733. Without external magnetic force, the first magnetic strip 7312 and the first magnetic sheet 7311 remain adsorbed and bonded. The first buffer sheet 7313 is bonded to the first magnetic sheet 7311. On the side away from the first magnetic strip 7312, the protrusion 7314 is attached to the side of the first buffer plate 7313 away from the first magnetic strip 7312. The limiting rod 7315 passes through the protrusion 7314, the first buffer plate 7313, the first magnetic strip 7312 and the first magnetic plate 7311, and the end of the limiting rod 7315 is connected to the wellhead sealing seat 73. The limiting rod 7315 is used to restrict the protrusion 7314, the first buffer plate 7313, the first magnetic strip 7312 and the first magnetic plate 7311 from moving linearly in the horizontal direction.

[0035] Reference Figure 7In one embodiment of the present invention, the second bonding piece 735 specifically includes a second buffer piece 7351, a buffer groove 7352, a second magnetic piece 7353, and a second magnetic strip 7354. The second buffer piece 7351 is bonded to the side of the second magnetic piece 7353 near the first magnetic piece 7311. The buffer groove 7352 is constructed on the side of the second buffer piece 7351 near the first buffer piece 7313, and the buffer groove 7352 is adapted to the protrusion 7314. The second magnetic piece 7353 is slidably disposed in the slide groove 733, and the second magnetic strip 7354 is fixedly bonded to the corresponding slide groove 733. The magnetic force between the first magnetic piece 7311 and the second magnetic piece 7353 is greater than that between the first magnetic piece 7311 and the first magnetic strip 731. The attraction of the first magnetic strip 7311 and the second magnetic strip 7353, along with the attraction of the second magnetic piece 7353 and the second magnetic strip 7354, results in the minimum distance between the first magnetic piece 7311 and the second magnetic piece 7353 when the vertical contact surfaces 732 of the two wellhead sealing seats 73 are in contact. Since the adjacent sides of the first magnetic piece 7311 and the second magnetic piece 7353 are of opposite polarity, under the magnetic attraction of the first magnetic piece 7311 and the second magnetic piece 7353, the first magnetic piece 7311 separates from the first magnetic strip 7312, and the second magnetic piece 7353 separates from the second magnetic strip 7354. Subsequently, the first magnetic piece 7311 and the second magnetic piece 7353 move along their respective sliding grooves 733 toward the vertical contact surface 732 until the protrusion 7314 enters the buffer groove 7352. Figure 7 As shown, the second buffer plate 7351, the second magnetic plate 7353, and the second magnetic strip 7354 are also penetrated by a limiting rod 7315, and the end of the limiting rod 7315 is connected to the corresponding wellhead sealing seat 73.

[0036] Reference Figure 4 and Figure 8 In one embodiment of the present invention, the power assembly 8 specifically includes a sealing frame 81, a sealing cover 82, a screw 83, and a limiting block 84. The sealing frame 81 is sealed and installed on the top of the fitting frame 71, and the sealing cover 82 is sealed and installed on the end of the sealing frame 81. An explosion-proof motor is installed inside the sealing cover 82. The outer shell of the explosion-proof motor can withstand the pressure generated by an internal explosion and can prevent the internal flame and high-temperature gas from spreading outside the shell, thus preventing the ignition of the surrounding flammable environment. The screw 83 is rotatably installed inside the sealing frame 81, and the end of the screw 83 is connected to the output shaft of the explosion-proof motor. The limiting block 84 is installed on the top edge of the wellhead sealing seat 73 and is threadedly connected to the screw 83. The top and both sides of the limiting block 84 are slidably fitted with the sealing frame 81. When two explosion-proof motors in the same power assembly 8 are started, they drive the screw 83 to rotate, causing the limiting block 84 to move the wellhead sealing seat 73 closer to or further away from each other.

[0037] Working principle: This application is applied to the 175MPa gas wellhead. When the gas well is regularly maintained and damaged parts are replaced, the isolation chamber 1 is sealed. The remote control integrated controller 6 connects the power supply to the connecting component 3. The high-pressure gas in the lower connecting pipe 9 enters the end of the lower wellhead sealing component 7 through the connecting component 3. Then, the integrated controller 6 connects the power supply to the lower power component 8. Under the action of the high-pressure gas and the power input of the lower power component 8, the lower wellhead sealing component 7 moves horizontally to seal the isolation chamber 1. Then, the integrated controller 6 disconnects the power supply to the connecting component 3 and the lower power component 8. After the lower wellhead sealing component 7 is closed, the integrated controller 6 connects the power supply to the upper power component 8. Then, the power component 8 drives the upper wellhead sealing component 7 to close, thereby achieving double isolation and achieving a better sealing effect.

[0038] Specifically, when the main control valve 33 is in the on state, high-pressure gas enters the lower fitting pipe 32 through the main control valve 33, and then enters the fitting frame 71 from the corresponding arc-shaped pipe 322 and connector 323, located on the side away from the wellhead sealing seat 73. The high-pressure gas applies a horizontal thrust to the wellhead sealing seat 73 from the side away from the wellhead sealing seat 73, thereby reducing the burden on the explosion-proof motor. As the explosion-proof motor drives the screw 83 to rotate in the corresponding direction, the wellhead sealing seats 73 move closer to each other under the action of the screw 83 and the limiting block 84. When the arc-shaped side 734 enters the upper connecting pipe 2 or the lower connecting pipe 9, the obstruction effect of the high-pressure gas below the corresponding connecting pipe on the wellhead sealing seat 73 is reduced, and the high-pressure gas acting on the arc-shaped side 734 can help push the wellhead sealing seats 73 closer to each other. When the vertical contact surfaces 732 of the two wellhead sealing seats 73 come into contact... At this time, the distance between the first magnetic sheet 7311 and the second magnetic sheet 7353 reaches its minimum. Since the adjacent sides of the first magnetic sheet 7311 and the second magnetic sheet 7353 are set with opposite polarities, under the magnetic attraction of the first magnetic sheet 7311 and the second magnetic sheet 7353, the first magnetic sheet 7311 separates from the first magnetic strip 7312, and the second magnetic sheet 7353 separates from the second magnetic strip 7354. Then the first magnetic sheet 7311 and the second magnetic sheet 7353 move along the corresponding sliding groove 733 towards the vertical contact surface 732 side until the protrusion 7314 enters the buffer groove 7352, thereby completing the sealing operation of the isolation chamber 1. After the sealing is completed, the integrated controller 6 switches the main control valve 33 to the closed state and disconnects the power supply of the explosion-proof motor located below. Then the power supply of the explosion-proof motor above is turned on. Under the action of the explosion-proof motor, the wellhead sealing seat 73 above moves and fits, forming a double barrier seal.

[0039] When it is necessary to reopen the isolation chamber 1, the integrated controller 6 controls the explosion-proof motor to rotate in reverse, first resetting the upper wellhead sealing seat 73, and then resetting the lower wellhead sealing seat 73.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A 175MPa gas production wellhead device, comprising an isolation chamber, an upper connecting pipe, and a lower connecting pipe, wherein the upper connecting pipe and the lower connecting pipe are respectively connected to the upper and lower ends of the isolation chamber via flanges, characterized in that: It also includes a connecting component, a pressure sensor, a humidity sensor, an integrated controller, a wellhead sealing component, and a power component. The pressure sensor, humidity sensor, and integrated controller are all installed on the outer periphery of the isolation chamber. Two sets of wellhead sealing components are symmetrically arranged and fitted onto the outer periphery of the upper and lower connecting pipes, respectively. The connecting component connects between the two sets of wellhead sealing components, and the air inlet end of the connecting component is sealed to the lower connecting pipe. The four power components are symmetrically arranged in pairs on the surface of the two sets of wellhead sealing components, and the power components are drively connected to the wellhead sealing components. The integrated controller is connected to the connecting component, the pressure sensor, the humidity sensor, and the power component, respectively. The integrated controller adjusts the opening and closing of the corresponding part of the connecting component according to the feedback value of the pressure sensor. The connecting component introduces gas into the corresponding wellhead sealing component through the opening part, thereby assisting the power component in driving the wellhead sealing component to close. When the pressure value of the pressure sensor decreases and remains unchanged, the integrated controller adjusts the power component accordingly to close the other wellhead sealing component.

2. The 175MPa gas production wellhead device according to claim 1, characterized in that: The connecting component includes a straight pipe, a fitting pipe, and a main control valve. The two fitting pipes are respectively connected to two sets of wellhead sealing components. The straight pipe is connected between the two fitting pipes. The main control valve is installed between the lower fitting pipe and the lower connecting pipe.

3. The 175MPa gas production wellhead device according to claim 2, characterized in that: The fitting tube includes a solenoid valve, an arc-shaped tube, and a connector. One end of the arc-shaped tube is equipped with a connector, which is sealed to the end of the wellhead sealing assembly. The other end of the arc-shaped tube is connected to the other end of the straight tube and to the end of the straight tube. The solenoid valve is installed at the connection point of the arc-shaped tube near the end of the straight tube.

4. The 175MPa gas production wellhead device according to claim 1, characterized in that: The wellhead sealing assembly includes a fitting frame, a limiting groove, and a wellhead sealing seat. The two fitting frames are respectively sealed and fitted onto the outer periphery of the upper connecting pipe or the outer periphery of the lower connecting pipe. The limiting groove is located inside the fitting frame. The two wellhead sealing seats are respectively slidably disposed in the limiting grooves of the two fitting frames, and the wellhead sealing seats are connected to the power assembly for transmission.

5. The 175MPa gas production wellhead device according to claim 4, characterized in that: The wellhead sealing seats are all configured with vertical contact surfaces on their adjacent sides, and the sidewalls of the wellhead sealing seats are provided with sliding grooves on the vertical contact surfaces. A first bonding piece and a second bonding piece are respectively provided in the two sliding grooves. The wellhead sealing seats are all configured with arc-shaped side surfaces on their opposite sides. When the wellhead sealing seats move into the corresponding connecting pipe, the high-pressure air acts on the arc-shaped side surfaces to keep the top of the wellhead sealing seats in sliding contact with the inner top surface of the bonding frame. When the vertical contact surfaces of the two wellhead sealing seats are in contact, the first bonding piece and the second bonding piece slide along the corresponding sliding grooves and fit tightly together.

6. The 175MPa gas production wellhead device according to claim 5, characterized in that: The first bonding piece includes a first magnetic sheet, a first magnetic strip, a first buffer sheet, a convex strip, and a limiting rod. The first magnetic sheet is slidably disposed in a groove, and the first magnetic strip is bonded and fixed in the groove. Without the action of external magnetic force, the first magnetic strip and the first magnetic sheet remain adsorbed and bonded. The first buffer sheet is bonded to the side of the first magnetic sheet away from the first magnetic strip, and the convex strip is bonded to the side of the first buffer sheet away from the first magnetic strip. The limiting rod passes through the convex strip, the first buffer sheet, the first magnetic strip, and the first magnetic sheet, and the end of the limiting rod is connected to the wellhead sealing seat.

7. The 175MPa gas production wellhead device according to claim 6, characterized in that: The second bonding piece includes a second buffer sheet, a buffer groove, a second magnetic sheet, and a second magnetic strip. The second buffer sheet is bonded to the side of the second magnetic sheet near the first magnetic sheet. The buffer groove is constructed on the side of the second buffer sheet near the first buffer sheet and is adapted to the convex strip. The second magnetic sheet is slidably disposed in the sliding groove, and the second magnetic strip is fixedly bonded to the corresponding sliding groove. The magnetic force between the first magnetic sheet and the second magnetic sheet is greater than the attraction force between the first magnetic sheet and the first magnetic strip and the attraction force between the second magnetic sheet and the second magnetic strip.

8. The 175MPa gas production wellhead device according to claim 1, characterized in that: The power assembly includes a sealing frame, a sealing cover, a screw, and a limiting block. The sealing frame is sealed and installed on the top of the fitting frame, and the sealing cover is sealed and installed on the end of the sealing frame. An explosion-proof motor is installed inside the sealing cover. The screw is rotatably installed inside the sealing frame, and the end of the screw is connected to the output shaft of the explosion-proof motor. The limiting block is installed on the top edge of the wellhead sealing seat, and the limiting block is threadedly connected to the screw. The top and both sides of the limiting block are slidably fitted with the sealing frame.

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