CN112392998A - Intelligent natural gas wellhead emergency cut-off valve and control method thereof - Google Patents
Intelligent natural gas wellhead emergency cut-off valve and control method thereof Download PDFInfo
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- CN112392998A CN112392998A CN202011307949.8A CN202011307949A CN112392998A CN 112392998 A CN112392998 A CN 112392998A CN 202011307949 A CN202011307949 A CN 202011307949A CN 112392998 A CN112392998 A CN 112392998A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 239000003345 natural gas Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 6
- 239000007789 gas Substances 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 238000006073 displacement reaction Methods 0.000 claims description 39
- 238000004146 energy storage Methods 0.000 claims description 27
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 8
- 239000002343 natural gas well Substances 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/025—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining open after return of the normal pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/16—Control means therefor being outside the borehole
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0486—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with mechanical actuating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/16—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member
- F16K31/163—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanically-Actuated Valves (AREA)
Abstract
The invention relates to an intelligent natural gas wellhead emergency cut-off valve, relating to the field of gas production process of a gas field, in particular to an emergency cut-off valve which can be used for a gas production wellhead of the gas field, and particularly relating to an intelligent natural gas wellhead emergency cut-off valve which comprises a valve body communicated with an air inlet pipe and an air outlet pipe, wherein a valve seat is arranged in the valve body, and the valve seat divides the inner area of the valve body into two sealing areas communicated with the air inlet pipe and the air outlet pipe; the valve core is fixedly connected with the valve core by the valve rod, the valve core is blocked or separated from the communicating hole by the movement of the valve rod, the air inlet pipe and the air outlet pipe are mutually communicated or blocked, the limit-releasing driving device drives the limit mechanism to be separated from the limit of the limit platform, so that the valve rod moves towards the communicating hole, the valve core is blocked by the valve core, the valve rod moves away from the communicating hole by the resetting device, and the valve core is separated from the communicating hole, so that the natural gas pipeline can be conveniently cut off or communicated in emergency.
Description
Technical Field
The invention relates to the field of gas production processes of gas fields, in particular to an emergency cut-off valve which can be used for a gas production wellhead of a gas field, and particularly relates to an intelligent natural gas wellhead emergency cut-off valve.
Background
The topography condition of the Yanan gas field is complex, the single well yield is low, and the pressure drop rate is high; the early production blocks enter the middle and later development stages, the number of intermittent wells is gradually increased year by year, the production management difficulty of the gas well is gradually increased, manual intermittent well switching operation is frequent, the maintenance cost is increased year by year, and the influence on normal production due to untimely well switching can possibly occur. And particularly for the special working conditions of rainy and snowy weather and sulfur-containing gas, the safety risk of field operation is higher. Therefore, the development of the intelligent natural gas wellhead emergency cut-off valve is particularly important for improving the production efficiency, reducing the labor intensity of workers and the safety risk of field operation, reducing the production cost and the like.
Disclosure of Invention
In order to solve the problems, the invention provides the intelligent natural gas wellhead emergency cut-off valve which can master the well opening and closing state of the gas well in real time, can realize remote opening and closing of the gas well and can greatly reduce the production cost and the labor intensity of personnel.
The invention discloses an intelligent natural gas well head emergency cut-off valve which comprises a valve body communicated with an air inlet pipe and an air outlet pipe, wherein a valve seat is arranged in the valve body, the valve seat divides the inner area of the valve body into two sealing areas communicated with the air inlet pipe and the air outlet pipe, a communicating hole communicated with the two sealing areas is formed in the valve body, a valve core is connected to the communicating hole in a matching manner, a valve rod is fixedly connected to the valve core, one end, far away from the valve core, of the valve rod penetrates out of the sealing area, and the valve rod moves along the axial direction of;
the valve body is provided with a guide groove, one end of the valve rod, far away from the valve core, is slidably arranged in the guide groove, a limiting table is fixedly arranged on the valve rod, a third energy storage spring is sleeved on the valve rod between the guide groove and the limiting table, one surface, far away from the third energy storage spring, of the limiting table is connected with a limiting mechanism for limiting the extension of the third energy storage spring, and a limit-releasing driving device is connected onto the limiting mechanism;
when the off-limit driving device acts, the third energy storage spring stretches, the valve rod moves towards the communicating hole, and the valve core is driven to plug the passing hole;
and the valve rod is also provided with a resetting device.
Preferably, the off-limit driving device comprises a piston and a three-way valve;
the piston comprises a sealing baffle which is arranged in the piston in a sliding manner, the sealing baffle divides a cavity in the piston into a rod cavity and an air cavity, a piston rod is arranged in the rod cavity, one end of the piston rod is fixedly connected with the sealing baffle, the other end of the piston rod extends out of the rod cavity and then is fixedly connected with a limit-releasing rack, and the central axis of the piston rod and the central axis of the limit-releasing rack are positioned on the same straight line;
the valve body is rotatably provided with a disengagement limit gear, the disengagement limit gear is meshed with a disengagement limit rack, one surface of the disengagement limit gear is fixedly connected with a connecting rope tightening column, the connecting rope tightening column is connected with the limiting mechanism through a connecting rope, the disengagement limit gear rotates, and the connecting rope tightening column drives the limiting mechanism to relieve limit;
the three-way valve is connected with the air inlet pipe through a natural gas pipeline before the inlet, the three-way valve is communicated with an air cavity of the piston through a piston air cavity inlet pipeline, the three-way valve is further connected with an emptying pipeline, and the three-way valve is connected with a pressure switch for controlling the natural gas pipeline before the inlet to be communicated with the piston air cavity inlet pipeline.
Preferably, the limiting mechanism comprises two limiting pins which act synchronously, the two limiting pins are arranged on the valve body in a sliding manner, and the central axes of the two limiting pins are vertical to the central axis of the valve rod;
the two limiting pins are symmetrically arranged on two sides of the valve rod, and the ends, far away from each other, of the two limiting pins are fixedly connected with the connecting rope tightening columns through connecting ropes;
when the limit-releasing gear drives the connecting rope tightening column to rotate, the connecting rope connected with the limiting pins is wound on the connecting rope tightening column, the two limiting pins are far away from each other, and the limiting table penetrates through an area between the two limiting pins and moves towards the valve core along the axial direction of the valve rod;
and the limit pins are provided with limit pin resetting devices.
Preferably, the limit pin resetting device is a resetting spring, one end of the resetting spring is fixedly connected with one end of the limit pin, which is far away from the limit pin, and the other end of the resetting spring is fixedly connected with the valve body through a connecting piece;
the reset springs are all sleeved outside the connecting ropes;
when the gear for releasing limit drives the connecting rope to tighten up the column to rotate, the connecting rope is pulled, the reset spring is compressed, and the two limit pins are mutually far away.
Preferably, the connecting ropes on the same limiting pin are fixedly connected with the connecting rope tightening columns after passing through the two reversing pins.
Preferably, the resetting device comprises a resetting rack fixedly arranged on the valve rod, a resetting gear is meshed and connected to the resetting rack, and when the resetting gear rotates, the valve rod is driven to move towards or away from the communicating hole.
Preferably, the reset gear is connected with a manual reset device, the manual reset device comprises an operating handle, the operating handle is rotationally connected with the valve body, one end of the operating handle is fixedly connected with the reset gear, and the central axis of the operating handle and the rotation axis of the reset gear are positioned on the same straight line.
Preferably, an electric reset device is connected to the reset gear, the electric reset device comprises a motor, a motor shaft is fixedly connected with the reset gear, a central axis of the motor shaft and a rotation axis of the reset gear are positioned on the same straight line, and the motor is fixedly arranged on the valve body.
Or preferably, the valve body is also connected with a safety protection device for preventing the valve core from accidentally separating from the through hole, and when the valve core is blocked on the communication hole, the safety protection device limits the movement of the valve rod.
Preferably, the safety protection device comprises a limiting chuck, and the limiting chuck is arranged on the valve rod between the sealing area and the resetting device;
the valve body is provided with a through hole, the through hole is communicated with the through hole, the valve rod is provided with a limiting chuck, and the limiting chuck is provided with a limiting safety rod and a limiting operating rod which are fixedly connected with each other;
one side of the limiting operating rod is provided with a safety resetting device, the other side of the limiting operating rod is provided with a limiting pushing rod corresponding to the position of the safety resetting device, the limiting pushing rod is connected with the valve body in a sliding mode, and when the limiting pushing rod slides on the valve body towards the limiting pushing rod, the limiting operating rod is pushed to rotate towards the safety resetting device;
the safety reset device comprises a reset base fixedly arranged on the valve body, a hollow sleeve is arranged on the reset base, the sleeve is arranged towards the limiting operating rod, a safety reset column is sleeved in the sleeve in a sliding mode, one end of the safety reset column extends out of the sleeve and is arranged towards the limiting operating rod, the other end of the safety reset column is connected with the bottom surface of the sleeve through a safety reset spring, and when the limiting operating rod extrudes the safety reset column, the safety reset spring is compressed;
the limiting push rod is sleeved with a first retaining ring and a second retaining ring, the first retaining ring is fixedly connected with the limiting push rod, the second retaining ring is fixedly connected with the valve seat, the second retaining ring is movably connected with the limiting push rod, and a second energy storage spring is sleeved on the limiting push rod between the first retaining ring and the second retaining ring;
the limiting pushing rod is fixedly connected with a stop block, a vertical displacement rod and a transverse displacement rod are vertically arranged below the limiting pushing rod, a vertical rack is fixedly arranged on the vertical displacement rod, a transverse rack is fixedly arranged on the transverse displacement rod, the vertical displacement rod and the transverse displacement rod are both connected with the valve body in a sliding mode, the vertical rack and the transverse rack are meshed with the same transmission gear, and the transmission gear is rotatably arranged on the valve body;
the stop block is arranged towards the vertical displacement rod, and when the limit push rod slides on the valve body and the stop block is in contact with the vertical displacement rod, the vertical displacement rod limits the limit push rod to slide;
the end of the transverse moving rod facing the limiting chuck is provided with a roller, the other end of the transverse moving rod is sleeved with a third retaining ring and a fourth retaining ring, the third retaining ring is fixedly connected with the transverse moving rod, the fourth retaining ring is fixedly connected with the valve body, the fourth retaining ring is movably connected with the transverse moving rod, the third retaining ring is arranged on the transverse moving rod between the fourth retaining ring and the transverse rack, the upper step of the transverse moving rod between the third retaining ring and the fourth retaining ring is provided with a transverse reset spring,
the limiting chuck is provided with a convex rod on one side facing the transverse moving rod, the limiting chuck moves along with the valve rod or away from the communicating hole, and the convex rod extrudes the roller wheel when passing through the roller wheel and pushes the transverse moving rod to slide towards the direction away from the limiting chuck.
The valve core is fixedly connected with the valve core by the valve rod, the valve core is blocked or separated from the communicating hole by the movement of the valve rod, the air inlet pipe and the air outlet pipe are mutually communicated or blocked, the limit-releasing driving device drives the limit mechanism to be separated from the limit of the limit platform, so that the valve rod moves towards the communicating hole, the valve core is blocked by the valve core, the valve rod moves away from the communicating hole by the resetting device, the valve core is separated from the communicating hole, and the natural gas pipeline is conveniently cut off or communicated in emergency.
The invention realizes the limit of the valve core after plugging the intercommunicating pore by using the safety protection device, and ensures the safety in the use process.
The invention improves the management efficiency of the gas well, improves the execution of the intermittent switching system from unit day to unit hour, improves the accuracy of the intermittent system, and simultaneously facilitates the timely adjustment of the intermittent system according to the production condition of the gas well.
The invention reduces the risk of safety management and control, converts the field operation of personnel into indoor remote control, greatly reduces the injury risk of personnel caused by factors such as riding, field operation and the like, and greatly shortens the response time of emergency shut-in caused by overpressure of the gas gathering station, pipeline puncture and the like.
The intelligent natural gas well head emergency cut-off valve and the control method thereof reduce the management and maintenance cost of the gas well, basically solve the problem of a large amount of well opening and closing operations of intermittent wells, and greatly reduce the labor cost required by opening and closing the wells on site.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic structural view of a safety protection device.
FIG. 3 is a flowchart illustrating an opening control according to the present invention.
Reference numerals: 1-valve body, 2-valve seat, 3-valve core, 4-limit chuck, 5-valve rod, 6-motor, 7-motor shaft, 8-reset gear, 9-reset rack, 10-piston, 11-sealing baffle, 12-third energy storage spring, 13-piston cylinder inlet pipeline, 14-limit-removing rack, 15-three-way valve, 16-limit-removing gear, 17-limit pin, 18-pressure switch, 20-inlet front natural gas pipeline, 21-operating handle, 22-fourth retainer ring, 23-transverse reset spring, 24-transverse displacement rod, 25-roller, 26-convex rod, 27-limiter, 28-safety reset spring, 29-sleeve, 31-second energy storage spring, 32-manual reset button, 33-electric reset button, 34-stop, 35-vertical displacement rod, 36-transmission gear.
Detailed Description
The invention relates to an intelligent natural gas well head emergency cut-off valve which comprises a valve body 1 communicated with an air inlet pipe and an air outlet pipe, wherein a valve seat 2 is arranged in the valve body 1, the valve seat 2 divides the internal area of the valve body 1 into two sealing areas communicated with the air inlet pipe and the air outlet pipe, a communication hole communicated with the two sealing areas is formed in the valve body 1, a valve core 3 is connected onto the communication hole in a matching manner, a valve rod 5 is fixedly connected onto the valve core 3, one end, far away from the valve core 3, of the valve rod 5 penetrates out of the sealing area, and the valve rod 5 moves along the axial direction of;
the valve body 1 is provided with a guide groove, one end, far away from the valve core 3, of the valve rod 5 is arranged in the guide groove in a sliding mode, a limiting table is fixedly arranged on the valve rod 5, a third energy storage spring 12 is sleeved on the valve rod 5 between the guide groove and the limiting table, a limiting mechanism for limiting the third energy storage spring 12 to stretch is connected to one side, far away from the third energy storage spring 12, of the limiting table, and a limit-releasing driving device is connected to the limiting mechanism;
when the off-limit driving device acts, the third energy storage spring 12 stretches, the valve rod 5 moves towards the communicating hole, and the valve core 3 is driven to block the through hole;
and the valve rod 5 is also provided with a resetting device.
The off-limit driving device comprises a piston 10 and a three-way valve 15;
the piston 10 comprises a sealing baffle 11 which is arranged in the piston 10 in a sliding manner, the sealing baffle 11 divides an internal cavity of the piston 10 into a rod cavity and an air cavity, a piston 10 rod is arranged in the rod cavity, one end of the piston 10 rod is fixedly connected with a sealing baffle, the other end of the piston 10 rod extends out of the rod cavity and is fixedly connected with a release rack 14, and the central axis of the piston 10 rod and the central axis of the release rack 14 are positioned on the same straight line;
a disengagement gear 16 is rotatably arranged on the valve body 1, the disengagement gear 16 is meshed with a disengagement rack 14, one surface of the disengagement gear 16 is fixedly connected with a connecting rope tightening column, the connecting rope tightening column is connected with a limiting mechanism through a connecting rope, the disengagement gear 16 rotates, and the connecting rope tightening column drives the limiting mechanism to release limiting;
the three-way valve 15 is connected with an air inlet pipe through a natural gas pipeline 20 before the inlet, the three-way valve 15 is communicated with an air cavity of the piston 10 through a piston air cavity inlet pipeline 13, the three-way valve 15 is also connected with an emptying pipeline, and the three-way valve 15 is connected with a pressure switch 18 for controlling the natural gas pipeline 20 before the inlet to be communicated with the piston air cavity inlet pipeline 13.
The limiting mechanism comprises two limiting pins 17 which act synchronously, the two limiting pins 17 are arranged on the valve body 1 in a sliding manner, and the central axes of the two limiting pins 17 are vertical to the central axis of the valve rod 5;
the two limiting pins 17 are symmetrically arranged on two sides of the valve rod 5, and the ends, far away from each other, of the two limiting pins 17 are fixedly connected with the connecting rope tightening columns through connecting ropes;
when the limit releasing gear 16 drives the connecting rope tightening column to rotate, the connecting rope connected with the limiting pins 17 is wound on the connecting rope tightening column, the two limiting pins 17 are far away from each other, and the limiting table penetrates through the area between the two limiting pins 17 and moves towards the valve core 3 along the axial direction of the valve rod 5;
and the limiting pins 17 are provided with a resetting device for the limiting pins 17.
The reset device of the limit pin 17 is a reset spring, one end of the reset spring is fixedly connected with one end, away from the limit pin 17, of the reset spring, and the other end of the reset spring is fixedly connected with the valve body 1 through a connecting piece;
the reset springs are all sleeved outside the connecting ropes;
when the limit-disengaging gear 16 drives the connecting rope tightening column to rotate, the connecting rope is pulled, the return spring is compressed, and the two limit pins 17 are far away from each other.
The connecting rope on the same limiting pin 17 is fixedly connected with the connecting rope tightening column after being wound through the two reversing pins.
Resetting means is including the fixed rack 9 that resets that sets up on valve rod 5, the meshing is connected with reset gear 8 on the rack 9 that resets, rotates as reset gear 8, drives valve rod 5 and moves towards or keep away from the intercommunicating pore.
The reset gear 8 is connected with a manual reset device, the manual reset device comprises an operating handle 21, the operating handle 21 is rotationally connected with the valve body 1, one end of the operating handle 21 is fixedly connected with the reset gear 8, and the central axis of the operating handle 21 and the rotation axis of the reset gear 8 are positioned on the same straight line.
The reset gear 8 is connected with an electric reset device, the electric reset device comprises a motor 6, a motor shaft 7 is fixedly connected with the reset gear 8, the central axis of the motor shaft 7 and the rotation axis of the reset gear 8 are positioned on the same straight line, and the motor 6 is fixedly arranged on the valve body 1.
The valve body 1 is also connected with a safety protection device for preventing the valve core 3 from accidentally separating from the through hole, and when the valve core 3 is blocked on the communicating hole, the safety protection device limits the movement of the valve rod 5.
The safety protection device comprises a limiting chuck 4, wherein the limiting chuck 4 is arranged on the valve rod 5 between the sealing area and the reset device;
the valve body 1 is rotatably connected with the valve body, the connecting part of the limiting safety rod and the limiting operation rod is connected with the valve body 1 in a fixed mode, an included angle between the limiting safety rod and the limiting operation rod is an obtuse angle, and when the limiting operation rod rotates, the limiting safety rod abuts against the limiting chuck 4 and limits the valve rod 5 to move away from the communicating hole or separate from the limiting chuck 4;
one side of the limiting operating rod is provided with a safety resetting device, the other side of the limiting operating rod is provided with a limiting pushing rod corresponding to the position of the safety resetting device, the limiting pushing rod is connected with the valve body 1 in a sliding mode, and when the limiting pushing rod slides towards the limiting pushing rod on the valve body 1, the limiting operating rod is pushed to rotate towards the safety resetting device;
the safety reset device comprises a reset base fixedly arranged on the valve body 1, a hollow sleeve 29 is arranged on the reset base, the sleeve 29 is arranged towards the limiting operating rod, a safety reset column is sleeved in the sleeve 29 in a sliding mode, one end of the safety reset column extends out of the sleeve 29 and is arranged towards the limiting operating rod, the other end of the safety reset column is connected with the bottom surface of the sleeve 29 through a safety reset spring 28, and when the limiting operating rod extrudes the safety reset column, the safety reset spring 28 is compressed;
a first check ring and a second check ring are sleeved on the limiting push rod, the first check ring is fixedly connected with the limiting push rod, the second check ring is fixedly connected with the valve seat 2, the second check ring is movably connected with the limiting push rod, and a second energy storage spring 31 is sleeved on the limiting push rod between the first check ring and the second check ring;
the limiting pushing rod is fixedly connected with a stop block 34, a vertical displacement rod 35 and a transverse displacement rod 24 are vertically arranged below the limiting pushing rod, a vertical rack is fixedly arranged on the vertical displacement rod 35, a transverse rack is fixedly arranged on the transverse displacement rod 24, the vertical displacement rod 35 and the transverse displacement rod 24 are both connected with the valve body 1 in a sliding mode, the vertical rack and the transverse rack are meshed with the same transmission gear 36, and the transmission gear 36 is rotatably arranged on the valve body 1;
the stop block 34 is arranged towards the vertical displacement rod 35, and when the limit push rod slides on the valve body 1 and the stop block 34 is in contact with the vertical displacement rod 35, the vertical displacement rod 35 limits the limit push rod to slide;
a roller 25 is arranged at one end of the transverse moving rod facing the limiting chuck 4, a third retaining ring and a fourth retaining ring 22 are sleeved at the other end of the transverse moving rod, the third retaining ring is fixedly connected with the transverse moving rod, the fourth retaining ring 22 is fixedly connected with the valve body 1, the fourth retaining ring 22 is movably connected with the transverse moving rod, the third retaining ring is arranged on the transverse moving rod between the fourth retaining ring 22 and the transverse rack, a transverse return spring 23 is arranged on the upper step of a transverse moving rod 24 between the third retaining ring and the fourth retaining ring 22,
limiting chuck 4 is provided with nose bar 26 on the one side towards the lateral shifting pole, moves towards or keeps away from the intercommunicating pore when limiting chuck 4 along with valve rod 5, and nose bar 26 is when gyro wheel 25, extrudees gyro wheel 25 to promote lateral shifting pole 24 and slide towards the direction of keeping away from limiting chuck 4.
The pressure switch 18 is a mechanical pressure switch 18: the model is TL0202, the manufacturer is Changzhou Tianli intelligent control corporation, when the inlet pressure of the invention exceeds or is lower than the set value, the pressure switch 18 controls the left side and the right side of the three-way valve 15 to be in a conducting state, namely the natural gas pipeline 20 before the inlet is communicated with the air cavity of the piston 10.
When the pressure of the natural gas wellhead is normal, the natural gas wellhead is in an open state, namely the gas inlet pipe is communicated with the gas outlet pipe, and a natural gas well is normally produced.
When the pressure switch 18 detects that the pressure of the wellhead is over-pressure or ultra-low, the pressure switch triggers the action of the gas well control valve, the valve body 1 can be quickly closed, the gas well is cut off, and the production safety of the gas well is improved.
After the well head pressure is recovered to be normal after the gas well fault is eliminated, the valve body 1 is opened by manually or electrically starting the reset device, and the natural gas well is normally produced.
Specifically, during normal production, the valve body 1 is in an open state, the pressure value of the pressure switch 18 is set according to the safety range of wellhead pressure, the pressure before the emergency cut-off valve is within a set value, the limiting pin 17 is positioned at the bottom of the limiting chuck 4, and the energy storage spring is prevented from pressing the valve rod 5; the limiting operation rod of the limiting rod is in a non-pressing state, the limiting safety rod is positioned on one side of the limiting chuck 4, and the limiting device 27 pushes the rod second energy storage spring 31 to be in a non-compression state.
When the pressure before the emergency cut-off valve exceeds or falls below the set value, as shown in fig. 1, the pressure switch 18 controls the left side and the right side of the three-way valve 15 to be in a conducting state, and the natural gas pipeline 20 before the inlet is communicated with the air cavity of the piston 10. The gas pushes the piston 10 to move leftwards, the limit releasing gear 16 is driven to rotate anticlockwise, the two limit pins 17 are pulled to be away from each other, the third energy storage spring 12 pushes the valve rod 5 to move downwards, the valve core 3 blocks the communicating hole, and the valve is closed.
Meanwhile, the convex rod 26 on the limiting chuck 4 moves downwards along with the valve rod 5, as shown in fig. 2, the transverse displacement rod 24 is pushed to move left, the transmission gear 36 is driven to rotate clockwise, the vertical displacement rod 35 is driven to move downwards through the vertical rack, the position limitation on the limiting push rod is lost, the second energy storage spring 31 bounces the limiting push rod to the left, and the limiting operation rod is in a non-pressing state; when the valve is completely closed, the limiting safety rod is positioned above the limiting chuck 4, so that the valve is prevented from being opened due to high pressure.
And (3) eliminating the fault of the natural gas wellhead, recovering the pressure to be normal, controlling the three-way valve 15 to conduct the emptying pipeline and the air cavity of the piston 10 by the pressure switch 18 after the natural gas wellhead is opened, emptying the air in the piston 10 by the three-way valve 15, and preparing for next emergency shutdown. The valve body 1 needs to be opened; firstly, the electric reset is needed, then the motor 6 is controlled to be started, the valve rod 5 is driven to move upwards, the valve is opened, and the valve can also be opened through a hand wheel.
Specifically, the manual reset button 32 or the electric reset button 33 is pressed, the manual or electric reset button 33 pushes the limit pushing rod to move leftwards, the limit operating rod is pushed to rotate clockwise, the limit safety rod is moved to one side of the limit chuck 4, and the limit on the limit chuck 4 is released; meanwhile, the limiting push rod is clamped by the vertical displacement rod 35 after moving to the right and cannot move to the right; at the moment, the motor 6 or the hand wheel is started to rotate, the valve rod 5 is driven to move upwards, the valve body 1 is opened, the valve rod 5 moves upwards, the convex rod 26 pushes the transverse displacement rod 24 to move leftwards, the transmission gear 36 rotates clockwise, the vertical displacement rod 35 moves downwards, the position of the push rod of the limiting stopper 27 is not limited, the second energy storage spring 31 bounces the push rod of the limiting stopper 27 leftwards, the limiting stopper 27 is in a non-pressing state, the lower end of the limiting rod is positioned on the left side of the limiting chuck 4, and the normal production state is recovered.
Claims (10)
1. An intelligent natural gas well head emergency cut-off valve comprises a valve body (1) communicated with an air inlet pipe and an air outlet pipe, wherein a valve seat (2) is arranged in the valve body (1), the valve seat (2) divides the internal area of the valve body (1) into two sealing areas communicated with the air inlet pipe and the air outlet pipe, a communication hole communicated with the two sealing areas is formed in the valve body (1), a valve core (3) is connected onto the communication hole in a matching mode, a valve rod (5) is fixedly connected onto the valve core (3), one end, far away from the valve core (3), of the valve rod (5) penetrates out of the sealing area, and the valve rod (5) moves along the axial direction of the valve rod to drive;
the valve is characterized in that a guide groove is formed in the valve body (1), one end, far away from the valve core (3), of the valve rod (5) is arranged in the guide groove in a sliding mode, a limiting table is fixedly arranged on the valve rod (5), a third energy storage spring (12) is sleeved on the valve rod (5) between the guide groove and the limiting table, one surface, far away from the third energy storage spring (12), of the limiting table is connected with a limiting mechanism for limiting the third energy storage spring (12) to stretch, and a limit-releasing driving device is connected to the limiting mechanism;
when the limit-releasing driving device acts, the third energy-storage spring (12) stretches, the valve rod (5) moves towards the communicating hole, and the valve core (3) is driven to plug the passing hole;
and the valve rod (5) is also provided with a resetting device.
2. The intelligent natural gas wellhead emergency shut-off valve as claimed in claim 1, wherein the off-limit driving device comprises a piston (10) and a three-way valve (15);
the piston (10) comprises a sealing baffle (11) which is arranged in the piston (10) in a sliding mode, the sealing baffle (11) divides an inner cavity of the piston (10) into a rod cavity and an air cavity, a piston rod is arranged in the rod cavity, one end of the piston rod is fixedly connected with the sealing baffle, the other end of the piston rod extends out of the rod cavity and is fixedly connected with a limit-releasing rack (14), and the central axis of the piston rod and the central axis of the limit-releasing rack (14) are located on the same straight line;
a disengagement limit gear (16) is rotatably arranged on the valve body (1), the disengagement limit gear (16) is meshed with a disengagement limit rack (14), one surface of the disengagement limit gear (16) is fixedly connected with a connecting rope tightening column, the connecting rope tightening column is connected with a limiting mechanism through a connecting rope, the disengagement limit gear (16) rotates, and the connecting rope tightening column drives the limiting mechanism to release limiting;
the three-way valve (15) is connected with the air inlet pipe through a natural gas pipeline before the inlet, the three-way valve (15) is communicated with an air cavity of the piston (10) through a piston air cavity inlet pipeline (13), the three-way valve (15) is further connected with an emptying pipeline, and the three-way valve (15) is connected with a pressure switch (18) which controls the communication between the natural gas pipeline (20) before the inlet and the piston air cavity inlet pipeline (13).
3. The intelligent natural gas wellhead emergency shut-off valve is characterized in that the limiting mechanism comprises two limiting pins (17) which act synchronously, the two limiting pins (17) are arranged on the valve body (1) in a sliding mode, and the central axes of the two limiting pins (17) are perpendicular to the central axis of the valve rod (5);
the two limiting pins (17) are symmetrically arranged on two sides of the valve rod (5), and the ends, far away from each other, of the two limiting pins (17) are fixedly connected with the connecting rope tightening columns through connecting ropes;
when the limit releasing gear (16) drives the connecting rope tightening column to rotate, the connecting rope connected with the limiting pins (17) is wound on the connecting rope tightening column, the two limiting pins (17) are far away from each other, and the limiting table penetrates through the area between the two limiting pins (17) and moves towards the valve core (3) along the axial direction of the valve rod (5);
and the limiting pins (17) are provided with resetting devices of the limiting pins (17).
4. An intelligent natural gas wellhead emergency shut-off valve according to claim 3, characterized in that the reset device of the limit pin (17) is a reset spring, one end of the reset spring is fixedly connected with the end of the limit pin (17) away from each other, and the other end of the reset spring is fixedly connected with the valve body (1) through a connecting piece;
the reset springs are all sleeved outside the connecting ropes;
when the limit releasing gear (16) drives the connecting rope tightening column to rotate, the connecting rope is pulled, the return spring is compressed, and the two limit pins (17) are far away from each other;
the connecting ropes on the same limiting pin (17) are fixedly connected with the connecting rope tightening columns after being wound through the two reversing pins.
5. An intelligent natural gas wellhead emergency shut-off valve according to claim 1, characterized in that the reset device comprises a reset rack (9) fixedly arranged on the valve rod (5), a reset gear (8) is engaged and connected on the reset rack (9), and when the reset gear (8) rotates, the valve rod (5) is driven to move towards or away from the communication hole.
6. An intelligent natural gas well head emergency cut-off valve according to claim 5, wherein a manual reset device is connected to the reset gear (8), the manual reset device comprises an operating handle (21), the operating handle (21) is rotatably connected with the valve body (1), one end of the operating handle (21) is fixedly connected with the reset gear (8), and the central axis of the operating handle (21) is in the same straight line with the rotation axis of the reset gear (8).
7. The intelligent natural gas wellhead emergency shut-off valve is characterized in that an electric reset device is connected to the reset gear (8), the electric reset device comprises a motor (6), a motor shaft (7) is connected to the motor (6), the motor shaft (7) is fixedly connected with the reset gear (8), the central axis of the motor shaft (7) and the rotation axis of the reset gear (8) are located on the same straight line, and the motor (6) is fixedly arranged on the valve body (1).
8. An intelligent natural gas well head emergency shut-off valve according to any one of claim 7, characterized in that a safety protection device for preventing the valve core (3) from accidentally separating from the through hole is further connected to the valve body (1), and when the valve core (3) is blocked on the communication hole, the safety protection device limits the movement of the valve rod (5).
9. The intelligent natural gas wellhead emergency shut-off valve is characterized in that the safety protection device comprises a limiting chuck (4), wherein the limiting chuck (4) is arranged on the valve rod (5) between the sealing area and the resetting device;
the valve body is characterized by further comprising a limiting rod, wherein the limiting rod comprises a limiting safety rod (27) and a limiting operation rod which are fixedly connected, the joint of the limiting safety rod (27) and the limiting operation rod is rotatably connected with the valve body (1), an included angle between the limiting safety rod (27) and the limiting operation rod is an obtuse angle, and when the limiting operation rod rotates, the limiting safety rod (27) abuts against the limiting chuck (4) and limits the valve rod (5) to move away from the communicating hole or separate from the limiting chuck (4);
one side of the limiting operating rod is provided with a safety reset device, the other side of the limiting operating rod is provided with a limiting push rod corresponding to the position of the safety reset device, the limiting push rod is connected with the valve body (1) in a sliding manner, and when the limiting push rod slides towards the limiting push rod on the valve body (1), the limiting operating rod is pushed to rotate towards the safety reset device;
the safety reset device comprises a reset base fixedly arranged on the valve body (1), a hollow sleeve (29) is arranged on the reset base, the sleeve (29) is arranged towards the limiting operating rod, a safety reset column is sleeved in the sleeve (29) in a sliding mode, one end of the safety reset column extends out of the sleeve (29) and is arranged towards the limiting operating rod, the other end of the safety reset column is connected with the bottom surface of the sleeve (29) through a safety reset spring (28), and when the limiting operating rod extrudes the safety reset column, the safety reset spring (28) is compressed;
a first check ring and a second check ring are sleeved on the limiting push rod, the first check ring is fixedly connected with the limiting push rod, the second check ring is fixedly connected with the valve seat (2), the second check ring is movably connected with the limiting push rod, and a second energy storage spring (31) is sleeved on the limiting push rod between the first check ring and the second check ring;
a stop block (34) is fixedly connected to the limiting push rod, a vertical displacement rod (35) and a transverse displacement rod (24) are vertically arranged below the limiting push rod, a vertical rack is fixedly arranged on the vertical displacement rod (35), a transverse rack is fixedly arranged on the transverse displacement rod (24), the vertical displacement rod (35) and the transverse displacement rod (24) are both connected with the valve body (1) in a sliding manner, the vertical rack and the transverse rack are meshed with the same transmission gear (36), and the transmission gear (36) is rotatably arranged on the valve body (1);
the stop block (34) is arranged towards the vertical displacement rod (35), and when the limiting push rod slides on the valve body (1) and the stop block (34) is in contact with the vertical displacement rod (35), the vertical displacement rod (35) limits the limiting push rod to slide;
one end of the transverse moving rod, which faces the limiting chuck (4), is provided with a roller (25), the other end of the transverse moving rod is sleeved with a third retaining ring and a fourth retaining ring (22), the third retaining ring is fixedly connected with the transverse moving rod, the fourth retaining ring (22) is fixedly connected with the valve body (1), the fourth retaining ring (22) is movably connected with the transverse moving rod, the third retaining ring is arranged on the transverse moving rod between the fourth retaining ring (22) and the transverse rack, a transverse reset spring (23) is arranged on the upper step of a transverse moving rod (24) between the third retaining ring and the fourth retaining ring (22),
spacing chuck (4) are provided with nose bar (26) on the one side towards transverse movement pole, move along with valve rod (5) orientation or keep away from the intercommunicating pore when spacing chuck (4), and nose bar (26) are when gyro wheel (25), squeeze roller (25) to promote transverse movement pole (24) and slide towards the direction of keeping away from spacing chuck (4).
10. The control method of an intelligent natural gas wellhead emergency shutdown valve according to claim 9,
during normal production, the valve body (1) is in an opening state, the pressure value of the pressure switch (18) is set according to the safety range of wellhead pressure, the pressure before the emergency cut-off valve is within a set value, and the limiting pin (17) is positioned at the bottom of the limiting chuck (4) and blocks the energy storage spring from pressing down the valve rod (5); the limiting operation rod of the limiting rod is in a non-pressing state, the limiting safety rod (27) is positioned on one side of the limiting chuck, and the second energy storage spring (31) of the pushing rod of the limiter is in a non-compression state;
when the pressure before the emergency cut-off valve exceeds or is lower than a set value, the pressure switch (18) controls the three-way valve (15) to act, so that the natural gas pipeline before the inlet is communicated with the air cavity of the piston (10);
the gas pushes the piston (10) to move, drives the limit-releasing gear (16) to rotate anticlockwise, pulls the two limit pins (17) to be away from each other, the third energy-storage spring (12) pushes the valve rod (5) to move downwards, the valve core (3) blocks the communicating hole, and the valve is closed;
meanwhile, a convex rod (26) on the limiting chuck (4) moves downwards along with the valve rod (5) to push the transverse displacement rod (24) to move left, the transmission gear (36) is driven to rotate clockwise, the vertical displacement rod (35) is driven to move downwards through the vertical rack, the position of the limiting push rod is not limited, the limiting push rod is bounced leftwards by a second energy storage spring (31), and the limiting operation rod is in a non-pressing state; when the valve is completely closed, the limiting safety rod (27) is positioned above the limiting chuck (4) to prevent the valve from being opened due to high pressure;
the natural gas wellhead fault is eliminated, the pressure is recovered to be normal, the pressure switch (18) controls the three-way valve (15) to conduct the emptying pipeline and the air cavity of the piston (10), the gas in the piston (10) is emptied through the three-way valve (15), and preparation is made for the next emergency shut-off;
the valve body (1) needs to be opened; firstly, electric reset is needed, then a motor (6) is controlled to start, a valve rod (5) is driven to move upwards, and the valve is opened;
specifically, a manual reset button (32) or an electric reset button (33) is pressed, the manual or electric reset button (33) pushes a limit pushing rod to move leftwards, pushes a limit operating rod to rotate clockwise, enables a limit safety rod (27) to move to one side of a limit chuck (4), and releases the limit of the limit chuck (4); meanwhile, the limiting push rod is clamped by a vertical displacement rod (35) after moving rightwards and cannot move rightwards; opening motor (6) or hand wheel and rotating this moment, drive valve rod (5) rebound, open valve body (1), valve rod (5) rebound in-process, protruding pole (26) promote horizontal displacement pole (24) and move to the left, drive gear (36) clockwise rotation, vertical displacement pole (35) move down, lose and to stopper catch bar position restriction, second energy storage spring (31) bounce open stopper catch bar left, the stopper is in the non-pressing state, the gag lever post lower extreme is in spacing chuck (4) left side, resume normal production state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011307949.8A CN112392998A (en) | 2020-11-20 | 2020-11-20 | Intelligent natural gas wellhead emergency cut-off valve and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011307949.8A CN112392998A (en) | 2020-11-20 | 2020-11-20 | Intelligent natural gas wellhead emergency cut-off valve and control method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062612A (en) * | 2021-11-19 | 2022-02-18 | 贵州电网有限责任公司 | Gaseous detection device of portable SF6 |
| CN114789985A (en) * | 2022-04-20 | 2022-07-26 | 江苏新时代造船有限公司 | Chemical tanker low-temperature liquid unloading device |
| CN117128330A (en) * | 2023-10-23 | 2023-11-28 | 江苏屹伟不锈钢管业有限公司 | Stainless steel cut-off valve |
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2020
- 2020-11-20 CN CN202011307949.8A patent/CN112392998A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062612A (en) * | 2021-11-19 | 2022-02-18 | 贵州电网有限责任公司 | Gaseous detection device of portable SF6 |
| CN114062612B (en) * | 2021-11-19 | 2023-11-24 | 贵州电网有限责任公司 | Mobile SF6 gas detection device |
| CN114789985A (en) * | 2022-04-20 | 2022-07-26 | 江苏新时代造船有限公司 | Chemical tanker low-temperature liquid unloading device |
| CN114789985B (en) * | 2022-04-20 | 2022-12-30 | 江苏新时代造船有限公司 | Chemical tanker low-temperature liquid unloading device |
| CN117128330A (en) * | 2023-10-23 | 2023-11-28 | 江苏屹伟不锈钢管业有限公司 | Stainless steel cut-off valve |
| CN117128330B (en) * | 2023-10-23 | 2023-12-22 | 江苏屹伟不锈钢管业有限公司 | Stainless steel cut-off valve |
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