175mpa gas recovery wellhead with remote control

Abstract

The present application relates to gas well technology field, concretely is a kind of 175MPa gas wellhead device with remote control, including gas tree main body and throw stick channel, further include: closed rotary feed mechanism, throw stick channel top sealing connection bin, the bottom of bin is provided with through-hole, it is equipped with rotating seat driven by servo motor, rotating seat annularly is equipped with multiple sleeve bearing defoaming stick, when rotating, it can be positioned sleeve to the above of through-hole;Grabbing and lowering mechanism, including lifting bin, winch shaft and counterweight type grabbing structure, lifting bin is connected bin by sealing channel, winch shaft is driven by speed reducer and around winding lifting rope, lifting rope is connected grabbing structure after penetrating guide plate and guide cylinder, grabbing structure includes heavy block's pressure seat, reset shaft and buckle;Synchronous control mechanism contains vertical sliding control lever and its bottom push rod, push rod is coupled with the stopper in the side wall of throw stick channel, control lever moves up to drive buckle and push rod to release stopper limit;The present application can effectively improve gas production efficiency.

Description

TECHNICAL FIELD

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

[0002] In the field of high-pressure natural gas production, the 175MPa gas production wellhead device as a key equipment undertakes important functions such as wellhead pressure control, fluid flow guiding and safety guarantee. With the development of deep gas fields, the downhole pressure environment is increasingly harsh, and the traditional gas production tree is facing severe challenges in high-pressure sealing, material strength and working condition adaptability. The existing 175MPa wellhead device generally adopts a multi-valve group structure and a reinforced shell design, and maintains high-pressure integrity through metal-to-metal sealing and pre-stressed bolt connection.

[0003] The gas production wellhead device is aimed at the gas well liquid loading problem, and the industry generally uses the foam displacement rod drainage gas production process at present, but the existing technology has obvious limitations: first, the traditional rod dropping method needs manual operation, and the well must be closed and depressurized during operation, resulting in production interruption and yield loss; second, manual rod dropping in a high-pressure environment poses a major safety hazard, and the 175MPa pressure puts high requirements on the sealing structure and operation procedures, while the existing rod dropping device mostly adopts a simple gravity dropping design and cannot adapt to the high-pressure gas flow environment, often resulting in incomplete dropping or rod jamming. Although there are some automatic rod dropping equipment on the market, their structure is complex, maintenance is difficult, and they are difficult to meet the reliability and sealing requirements under the extreme pressure of 175MPa. SUMMARY

[0004] The purpose of the present application is to provide a 175MPa gas production wellhead device with remote control to improve gas production efficiency and solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a 175MPa gas production wellhead device with remote control, comprising a gas production tree main body and a rod dropping channel connected thereto, further comprising:

[0006] A closed rotary feeding mechanism is sealingly connected to the top of the rod dropping channel, a through hole is formed in the bottom of the hopper, and a rotating seat driven by a servo motor is arranged inside, a plurality of clamping sleeves are arranged in the rotating seat in a ring shape, and the clamping sleeves can be positioned above the through hole one by one when rotating;

[0007] A grabbing and lowering mechanism is provided, comprising a lifting bin, a winch shaft and a counterweight type grabbing structure, the lifting bin is connected to the hopper through a sealing channel, the winch shaft is driven by a reduction motor and winds a lifting rope, the lifting rope penetrates through a guide plate and a guide cylinder and is connected to the grabbing structure, the grabbing structure comprises a pressure seat with a weight, a reset shaft and a buckle, and the buckle is linked with a control rod through a gear and rack transmission mechanism;

[0008] Synchronous control mechanism, including vertical sliding control rod and its bottom push rod, control rod top is provided with magnetic element corresponding to electromagnetic controller at top of material bin, push rod is coupled with stopper in side wall of throwing stick channel, stopper is extended and retracted through spring slide, stopper protrudes into center of channel to block defoaming stick in normal state, control rod moves up to drive buckle and push rod releases stopper limiting;

[0009] Supplementary seat is arranged at top of material bin, supplementary seat is connected with sealing cover through threaded sealing connection, sealing ring is arranged at bottom of sealing cover and side surface is communicated with grease injection valve.

[0010] Wherein, the top of the rotating seat is connected with the replacement shaft, the replacement shaft penetrates through the top of the material bin through the sealing bearing and is connected with the servo motor, the servo motor drives the replacement shaft to rotate the rotating seat by one sleeve position each time.

[0011] Wherein, the grabbing structure further comprises a positioning plate, the positioning plate is perpendicular to the pressing seat, the end of the lifting rope is tied to the positioning plate,

[0012] The end of the guide cylinder is provided with a pressure sensor, and the positioning plate can press the pressure sensor when it is recovered.

[0013] Wherein, the reset rotating shaft is a rotating shaft sleeved with a torsional spring, the reset rotating shaft is installed in the rotating groove of the pressing seat, and the weight is assembled on the pressing seat by buckling.

[0014] Wherein, the control rod is provided with a limiting groove, the limiting groove is sleeved on the guide cylinder, and an elastic element is connected between the control rod and the guide cylinder, the elastic element limits the control rod at a low position in a normal state.

[0015] Wherein, the top of the stopper is provided with a beveled tail seat, when the control rod is at a low position, the push rod is pressed on the beveled tail seat and drives the stopper to protrude into the center of the throwing stick channel.

[0016] Wherein, the grease injection valve is a one-way valve structure;

[0017] The grease injection valve is communicated with the threaded connection part of the supplementary seat and the sealing cover, and is used for injecting sealing grease into the threaded connection part.

[0018] Wherein, the sealing channel between the lifting bin and the material bin is a sealing welded connection channel;

[0019] The guide plates are two guide plates with center holes, which are welded on both sides of the connection channel.

[0020] Wherein, the speed of the hoisting shaft can be adjusted in the range of 0.1-0.5m / s.

[0021] Wherein, the sleeve is fixed on the outer wall of the rotating seat by welding, the sleeve is provided with a through placement groove, the defoaming stick is limited in the placement groove, and the bottom of the sleeve is arranged to match the bottom surface of the material bin.

[0022] The gear rack transmission mechanism comprises a support welded to the side of the control rod, a rack fixed to the support, and a gear installed at the end of the reset rotating shaft.

[0023] The gear and the rack are engaged in transmission.

[0024] The spring sliding rod is arranged in the installation cavity, and the blocking piece is sleeved on the spring sliding rod and can be extended and retracted along the spring sliding rod.

[0025] Compared with the prior art, the present application has the following advantages:

[0026] 1. The closed material bin designed in an integrated manner is connected with the main flange of the gas production tree, ensuring the structural strength and sealing performance under the high pressure of 175 MPa, and the replacement shaft driven by the servo motor in the rotary material bin drives the precise positioning of the rotating seat, and the bottom through hole is used to realize the orderly dropping of the defoaming rod, completely avoiding the safety risk of manual operation and significantly improving the operation efficiency.

[0027] 2. The buckle of the grabbing mechanism is rotated, and remote operation is realized through the magnetic control rod, ensuring reliable grabbing of the defoaming rod in a high-pressure environment, and the design of the hoisting shaft cooperating with the counterweight type pressure seat set in the bin is used to overcome the well pressure by using the gravity of the weight block, so as to ensure the smooth dropping of the defoaming rod into the well.

[0028] 3. The guide system composed of the guide cylinder and the guide plate ensures the linear motion of the lifting rope and avoids winding, and the mechanical structure of the linkage of the control rod and the blocking piece realizes the intelligent opening and closing of the defoaming rod channel, preventing the defoaming rod from falling prematurely.

[0029] 4. The supplemental seat adopts a threaded sealing structure enhanced by a grease injection valve to maintain the system sealing after supplementing the defoaming rod, and the entire device adopts a modular design, which not only ensures high-pressure sealing but also facilitates maintenance and replacement. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a whole schematic view of the gas production tree structure of the present application.

[0031] Figure 2 It is a schematic view of the defoaming rod structure of the present application.

[0032] Figure 3 It is a schematic view of the internal structure of the material bin of the present application.

[0033] Figure 4 It is a schematic view of the rotating seat and the defoaming rod structure of the present application.

[0034] Figure 5 It is a schematic view of the material bin and the hoisting bin structure of the present application.

[0035] Figure 6 It is a schematic view of the pressure seat and its hoisting structure of the present application.

[0036] Figure 7 The schematic view of the winch shaft and the lifting rope structure of the present application.

[0037] Figure 8 The schematic view of the pressing seat and the buckle structure of the present application.

[0038] Figure 9 The installation schematic view of the control lever structure of the present application.

[0039] Figure 10 The schematic view of the control lever structure of the present application.

[0040] Figure 11 The schematic view of the bar adding slot and the sealing structure thereof of the present application.

[0041] In the figure: 1, the gas production tree main body; 2, the bar throwing channel; 3, the material bin; 4, the through hole; 5, the rotating seat; 6, the sleeve; 7, the defoaming rod; 8, the replacement shaft; 9, the first motor; 10, the clamping groove; 11, the lifting bin; 12, the winch shaft; 13, the second motor; 14, the lifting rope; 15, the guide plate; 16, the guide cylinder; 17, the positioning plate; 18, the pressing seat; 19, the reset rotating shaft; 20, the buckle; 21, the weight; 22, the control lever; 23, the elastic member; 24, the support; 25, the rack; 26, the gear; 27, the push rod; 28, the spring sliding rod; 29, the blocking piece; 30, the inclined surface tail seat; 31, the magnetic member; 32, the electromagnetic controller; 33, the supplement seat; 34, the cover; 35, the sealing ring; 36, the grease injection valve. DETAILED DESCRIPTION

[0042] Hereinafter, the present application will be further described in conjunction with the drawings and the specific embodiments. It should be noted that, under the premise of no conflict, the embodiments described below or the technical features between them can be combined to form new embodiments. It is known that the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0043] Please refer to Figures 1 to 11 The present application provides a technical solution: a 175MPa gas wellhead device with remote control, which has a remote control pressure bar throwing function to solve the problem of gas well accumulation and improve gas production without manual well shut-in.

[0044] The gas wellhead device comprises a gas Christmas tree main body 1, and the gas Christmas tree main body 1 is composed of a wellhead vertical passage and a lateral pipeline, the top of the wellhead vertical passage is connected with a launching rod passage 2 through a flange, and a hopper 3 is sealingly welded on the launching rod passage 2, the hopper 3 is used for storing and supplying the defoaming rod 7, and the hopper 3 is of a closed structure as a whole.

[0045] A through hole 4 is formed at the position where the bottom of the hopper 3 is connected with the launching rod passage 2, a rotating seat 5 is rotatably arranged in the hopper 3, a replacement shaft 8 is connected with the top of the rotating seat 5 through welding, the replacement shaft 8 penetrates through the top of the hopper 3 through a sealing bearing, the replacement shaft 8 is connected with a first motor 9 at the top of the hopper 3, and the first motor 9 is a servo motor.

[0046] A clamping sleeve 6 is annularly arranged on the outer wall of the rotating seat 5, the clamping sleeve 6 is used for bearing the defoaming rod 7, the clamping sleeve 6 is connected with the outer wall of the rotating seat 5 through welding, a through accommodating groove is arranged in the clamping sleeve 6 for limiting the defoaming rod 7, the bottom of the clamping sleeve 6 is arranged in abutment with the bottom surface of the hopper 3, the replacement shaft 8 can drive the rotating seat 5 to rotate by one station of the clamping sleeve 6 each time, so as to push the defoaming rod 7, and the defoaming rod 7 can enter the launching rod passage 2 through the through hole 4 in sequence when needed.

[0047] A clamping groove 10 is formed at the top of the defoaming rod 7, the clamping groove 10 is used as a gripping point of the defoaming rod 7, so that the defoaming rod 7 can be sent into the gas well in a high-pressure environment.

[0048] A lifting bin 11 is connected to one side of the hopper 3, the lifting bin 11 is also of a fully-closed structure, a connecting passage is arranged between the lifting bin 11 and the hopper 3, and the connecting passage is sealingly welded between the hopper 3 and the lifting bin 11.

[0049] A winding shaft 12 is rotatably connected to the lifting bin 11 through a sealing bearing, and one end of the winding shaft 12 penetrates through the lifting bin 11, the installation position of the winding shaft 12 is ensured not to leak air through the sealing bearing, the winding shaft 12 is connected to a second motor 13 on the lifting bin 11, the winding shaft 12 is controlled through the second motor 13, a lifting rope 14 is wound on the winding shaft 12, the lifting rope 14 is used for downhole control of the defoaming rod 7, and the second motor 13 is a speed reducer.

[0050] Two guide plates 15 with central holes are welded on both sides of the connecting passage between the lifting bin 11 and the hopper 3, and the two guide plates 15 can limit and guide the lifting rope 14, a guide cylinder 16 is further arranged on the guide plate 15 close to the hopper 3, the guide cylinder 16 is fixed to the central hole of the guide plate 15 close to the hopper 3, the lifting rope 14 penetrates through the guide cylinder 16 and enters the hopper 3, and one end of the lifting rope 14 entering the hopper 3 is provided with a counterweight type gripping structure.

[0051] The grabbing structure comprises a positioning plate 17 and a pressing seat 18 which are integrally formed and perpendicular to each other, and the end of the lifting rope 14 is tied to the positioning plate 17, when the lifting rope 14 is tightened, the positioning plate 17 can be pressed on the guide cylinder 16, and the end of the guide cylinder 16 is provided with a pressure sensor, when the pressure sensor is pressed, it indicates that the positioning plate 17 and the pressing seat 18 are recovered to the position.

[0052] The grabbing structure further comprises a reset rotating shaft 19 which is installed on the pressing seat 18, and two buckles 20 are installed on both ends of the reset rotating shaft 19 through screws, the reset rotating shaft 19 is a rotating shaft with a torsion spring which is installed in the rotating groove of the pressing seat 18, and a heavy block 21 is assembled on the pressing seat 18 in a snap-fit manner, the gravity of the whole pressing seat 18 is lifted, so that when the pressing seat 18 is connected with the defoaming rod 7, it can provide enough gravity to overcome the rising air pressure and bring the defoaming rod 7 into the gas well.

[0053] The grabbing structure is above the through hole 4, when the rotating seat 5 is rotated and the sleeve 6 with the defoaming rod 7 is rotated to the position of the through hole 4, through the connection of the buckle 20 and the top clamping groove 10 of the defoaming rod 7, the defoaming rod 7 can be grabbed to the bottom of the pressing seat 18, and then the defoaming rod 7 falls into the wellhead together with the pressing seat 18, avoiding the situation that the defoaming rod 7 cannot enter the well under the pressure of the wellhead device, and the launching work of the defoaming rod 7 is completed remotely under full sealing, ensuring safety.

[0054] After the buckle 20 buckles the defoaming rod 7, the lifting rope 14 is controlled through the winch shaft 12, and the pressing seat 18 and the defoaming rod 7 are gradually lowered.

[0055] In order to ensure that the defoaming rod 7 can be rotated into the lower part of the grabbing structure without being blocked by the buckle 20, and not falling into the launching channel 2 before being grabbed, a control structure is arranged in the hopper 3 to control the state of the buckle 20 and the opening and closing of the launching channel 2.

[0056] The control structure comprises a control rod 22 with a limiting groove, the limiting groove of the control rod 22 is sleeved on the guide cylinder 16, at the same time, the bottom of the control rod 22 is integrally formed with a push rod 27 which is limitedly inserted into the side wall of the launching channel 2, so that the control rod 22 can move up and down at the position of the guide cylinder 16, and the control rod 22 and the guide cylinder 16 are connected with an elastic member 23, which is usually a spring, the control rod 22 is limited at the low position by the elastic force of the spring. The stiffness of the elastic member 23 meets the requirement of limiting the control rod 22 at the low position under normal conditions, and can be overcome by the 50N suction force of the electromagnetic controller 32.

[0057] The side of the control rod 22 is welded with a support 24, the rack 25 is installed on the support 24 in a welded manner, the end of the reset rotating shaft 19 is installed with a gear 26, the gear 26 is in the moving path of the rack 25, when the control rod 22 moves to the low position, the rack 25 can drive the gear 26 and the reset rotating shaft 19 to rotate, the buckle 20 is kept in the horizontal state, and the rotation displacement of the defoaming rod 7 is not hindered, and when the control rod 22 is lifted against the elastic force of the elastic member 23, the buckle 20 can be gradually rotated to the vertical state through the transmission of the gear 26 and the rack 25, and the buckle 20 is connected with the clamping groove 10 of the defoaming rod 7, so that the defoaming rod 7 is assembled to the bottom of the pressing seat 18.

[0058] Further, the side wall of the rod throwing channel 2 is provided with a modular installation cavity, a spring sliding rod 28 is arranged in the installation cavity, a stop piece 29 is sleeved on the spring sliding rod 28, under the action of the spring, the stop piece 29 is retracted in the side wall of the rod throwing channel 2, and the top of the stop piece 29 is provided with an inclined tail seat 30 through a screw, when the control rod 22 and the push rod 27 are in the low position, the push rod 27 can press on the inclined tail seat 30, and then the stop piece 29 enters the central cavity of the rod throwing channel 2, so that the defoaming rod 7 is blocked, and the defoaming rod 7 is prevented from entering the well mouth before being grabbed by the grabbing structure. Only when the control rod 22 is lifted against the elastic force of the elastic member 23, the push rod 27 gradually releases the inclined tail seat 30, and finally the stop piece 29 is retracted into the installation cavity when the buckle 20 is connected with the clamping groove 10, at this time, the position of the defoaming rod 7 can be controlled through the pressing seat 18 and the lifting rope 14.

[0059] The present application adopts an external control mode to control the lifting of the control rod 22, the top end of the control rod 22 is provided with a magnetic piece 31 in a fitting manner, and the top of the bin 3 is provided with an electromagnetic controller 32, after the defoaming rod 7 is rotated above the through hole 4, the electromagnetic controller 32 generates a magnetic attraction force on the magnetic piece 31, so that the control rod 22 is lifted, and the defoaming rod 7 is connected with the pressing seat 18.

[0060] A supplement seat 33 is welded and installed on the top of the bin 3, after the defoaming rod 7 in the bin 3 is used up, the defoaming rod 7 is added from the supplement seat 33, the supplement seat 33 can be sealed by a cover 34 to prevent natural gas leakage, the supplement seat 33 and the cover 34 are sealingly connected in a threaded connection manner, and the bottom of the cover 34 is further provided with a sealing ring 35, and the side of the cover 34 is provided with a grease injection valve 36, the grease injection valve 36 communicates with the threaded part of the cover 34, the grease injection valve 36 adopts a one-way valve structure, can inject sealing oil into the threaded part, and further improves the sealing effect to prevent leakage.

[0061] The application is used as follows: first, the first motor 9 is started by the remote control system to drive the replacement shaft 8 to rotate, and the rotating seat 5 drives the sleeve 6 loaded with the defoaming rod 7 to be accurately positioned above the through hole 4; at the same time, the electromagnetic controller 32 activates the magnetic part 31 to attract the control rod 22 to move upward, and the sleeve 20 is rotated to the vertical state through the transmission of the rack 25 and the gear 26 to engage and fix the clamping groove 10 at the top of the defoaming rod 7; at this time, the push rod 27 is released from the inclined surface tail seat 30 with the control rod 22 rising, and the blocking part 29 is retracted to the installation cavity under the action of the spring to release the block of the defoaming rod 7; the second motor 13 drives the winding shaft 12 to lower the lifting rope 14, and the pressure seat 18 carries the defoaming rod 7 along the guide cylinder 16 under the gravity of the weight 21 to vertically descend, enters the rod-throwing channel 2 through the through hole 4, and finally falls into the well to react with the bottom liquid to generate foam; after the throwing is completed, the lifting rope 14 is recovered, the positioning plate 17 triggers the pressure sensor at the end of the guide cylinder 16 to confirm the reset, and the rotating seat 5 rotates the next sleeve 6 to the working position; when the storage bin 3 is insufficient, the new defoaming rod 7 is injected through the supplement seat 33, the grease valve 36 pressurizes the sealing grease to the threaded sealing surface to ensure the air tightness under the working condition of 175 MPa, and the fully closed and pressurized remote rod throwing is realized.

[0062] The remote control system of the application is used to realize the automatic rod throwing operation of the gas production wellhead device, and specifically includes the following components and control methods:

[0063] Control unit

[0064] The control unit adopts an explosion-proof PLC controller and is installed in an explosion-proof control cabinet 5 meters away from the wellhead. The controller is connected with each actuator of the gas production tree through armored cables, and is equipped with a 4G / 5G communication module to realize wireless data transmission with the remote control center.

[0065] Communication system

[0066] The communication system adopts a double transmission mechanism: the main channel is a 4G / 5G wireless network, and the standby channel is an optical fiber communication. The data transmission adopts an AES-256 encryption protocol to ensure the communication safety.

[0067] Actuator control

[0068] Bin rotation control: the replacement shaft 8 is driven by a servo motor to accurately rotate the rotating seat 5, and the positioning accuracy of each sleeve 6 reaches ±0.5°. The rotation angle is fed back in real time by an encoder.

[0069] Grabbing mechanism control: the electromagnetic controller 32 is powered by 24V DC, and the maximum suction force is 50N to ensure reliable work in the environment of 175 MPa. The travel of the control rod 22 is set with a limit switch to prevent damage caused by overtravel.

[0070] Lifting mechanism control: the winding shaft 12 is driven by a reduction motor with brake function, the lifting speed can be adjusted in the range of 0.1-0.5m / s, and an overload protection device is provided.

[0071] Monitoring system

[0072] Pressure monitoring: one pressure sensor is arranged at the inlet and outlet of the rod dropping channel 2, specifically at the through hole 4 connecting the rod dropping channel 2 and the bin 3 and the port connecting the rod dropping channel 2 and the gas production tree main body 1, to monitor the pressure difference in real time, and the alarm threshold is set to 0.5MPa.

[0073] Position monitoring: the infrared sensor is used to detect the position of the defoaming rod 7 with an accuracy of ±1mm.

[0074] Bin residual amount monitoring: the weighing sensor is used to monitor the inventory of the defoaming rod 7 in the bin 3 in real time.

[0075] Safety protection system

[0076] Emergency stop function: when the pressure anomaly, communication interruption or actuator failure is detected, the system cuts off the power supply within 100ms, closes the main valve and locks the bin 3.

[0077] State self-checking function: the system automatically detects the state of each actuator when starting, and prohibits the rod dropping operation when abnormal.

[0078] Man-machine interface

[0079] The system is equipped with a 7-inch explosion-proof touch screen, which can display the current wellhead pressure, temperature, bin 3 residual amount and the latest rod dropping record, system running state and alarm information in real time.

[0080] The working process is as follows: the remote control center sends the rod dropping instruction → the PLC controller receives and verifies the instruction → the first motor 9 is started to rotate the bin 3 to the target station → the electromagnetic controller 32 is activated to lift the control rod 22 → the buckle 20 grabs the defoaming rod 7 → the second motor 13 releases the lifting rope 14 → the defoaming rod 7 enters the well → the sensor confirms that the rod dropping is completed → the system is reset and ready for operation. The whole process is completed in a closed environment without pressure relief, ensuring the safety of operation.

[0081] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A 175 MPa gas recovery wellhead with remote control, comprising a gas recovery tree body and a dart passage in communication therewith, characterized in that: Also include: Closed rotary feeding mechanism, the top of the stick channel is sealingly connected with the hopper, a through hole is formed in the bottom of the hopper, a rotating seat driven by a servo motor is arranged in the through hole, a plurality of clamping sleeves are arranged on the rotating seat in a ring shape, and the clamping sleeves can be positioned above the through hole when rotating; The grabbing and releasing mechanism comprises a lifting bin, a winch shaft and a counterweight type grabbing structure. The lifting bin is connected with the hopper through a sealing channel. The winch shaft is driven by a speed reducer and surrounds a lifting rope. The lifting rope penetrates through a guide plate and a guide cylinder and is connected with the grabbing structure. The grabbing structure comprises a pressing seat with a weight, a reset shaft and a buckle. The buckle is connected with the control rod through a gear and rack transmission mechanism. The synchronous control mechanism comprises a control rod sliding vertically and a push rod at the bottom of the control rod. A magnetic element is arranged at the top of the control rod. The magnetic element corresponds to an electromagnetic controller at the top of the hopper. The push rod is coupled with a stopper in the side wall of the stick channel. The stopper is extended and retracted through a spring sliding rod. The stopper protrudes into the center of the channel to block the defoaming rod in the normal state. When the control rod moves upward, the buckle is connected with the clamping groove at the top of the defoaming rod, and the push rod releases the stopper from the position limiting. A replenishment seat is arranged at the top of the hopper. The replenishment seat is sealingly connected with a cover through threads. A sealing ring is arranged at the bottom of the cover, and a grease injection valve is arranged on the side of the cover.

2. The 175 MPa gas wellhead with remote control according to claim 1, characterized in that: A replacement shaft is connected with the top of the rotating seat. The replacement shaft penetrates through the top of the hopper through a sealing bearing and is connected with the servo motor. The servo motor drives the replacement shaft to rotate the rotating seat by one position of the clamping sleeve each time.

3. The 175 MPa gas wellhead with remote control according to claim 1, characterized in that: The grabbing structure further comprises a positioning plate. The positioning plate is perpendicular to the pressing seat. The end of the lifting rope is tied to the positioning plate. A pressure sensor is arranged at the end of the guide cylinder. The positioning plate can press the pressure sensor when it is recovered.

4. The 175 MPa gas wellhead with remote control according to claim 1, characterized in that: The reset shaft is a shaft sleeved with a torsion spring. The reset shaft is arranged in a rotating groove of the pressing seat. The weight is assembled on the pressing seat through a buckling method.

5. The 175 MPa gas wellhead with remote control according to claim 1, characterized in that: The control rod is provided with a limiting groove. The limiting groove is sleeved on the guide cylinder. An elastic element is connected between the control rod and the guide cylinder. The elastic element limits the control rod at a low position in the normal state.

6. The 175 MPa gas wellhead with remote control according to claim 1, characterized in that: A beveled tailstock is arranged at the top of the stopper. When the control rod is at a low position, the push rod is pressed on the beveled tailstock and drives the stopper to protrude into the center of the stick channel.

7. The 175 MPa gas wellhead with remote control according to claim 1, characterized in that: The grease injection valve is a one-way valve structure. The grease injection valve is communicated with the threaded connection part of the replenishment seat and the cover, and is used for injecting sealing grease into the threaded connection part.

8. The 175 MPa gas wellhead with remote control according to claim 1, characterized in that: The sealing channel between the lifting bin and the hopper is a sealingly welded connection channel. The guide plate is a guide plate with a central hole, which is welded on both sides of the connection channel.

9. The 175 MPa gas wellhead with remote control according to claim 1, characterized in that: The speed reducer is provided with a brake function. The lifting speed of the winch shaft can be adjusted in the range of 0.1-0.5 m / s.

10. The 175 MPa gas wellhead with remote control according to claim 1, characterized in that: The clamping sleeve is fixed on the outer wall of the rotating seat by welding. The clamping sleeve is provided with a through placement groove. The defoaming rod is limited in the placement groove, and the bottom of the clamping sleeve is arranged on the bottom surface of the hopper.

11. The 175 MPa gas wellhead with remote control according to claim 1, characterized in that: The gear and rack transmission mechanism comprises a bracket welded on the side of the control rod, a rack fixed on the bracket, and a gear installed on the end of the reset shaft. The gear is engaged with the rack for transmission.

12. The 175 MPa gas wellhead with remote control according to claim 1, characterized in that: A modular mounting cavity is arranged in the side wall of the stick channel. The spring sliding rod is arranged in the mounting cavity. The stopper is sleeved on the spring sliding rod and can be extended and retracted along the spring sliding rod.

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