CN114607813A - Well head emergency cut-off device - Google Patents
Well head emergency cut-off device Download PDFInfo
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- CN114607813A CN114607813A CN202210302519.XA CN202210302519A CN114607813A CN 114607813 A CN114607813 A CN 114607813A CN 202210302519 A CN202210302519 A CN 202210302519A CN 114607813 A CN114607813 A CN 114607813A
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- 230000000903 blocking effect Effects 0.000 claims abstract description 37
- 238000007789 sealing Methods 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 239000010720 hydraulic oil Substances 0.000 description 27
- 230000004888 barrier function Effects 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a well head emergency cut-off device, wherein a valve rod is provided with a valve rod cavity, a valve rod piston is arranged in the valve rod cavity and divides the valve rod cavity into an upper valve rod cavity and a lower valve rod cavity, the pressure difference between the upper valve rod cavity and the lower valve rod cavity forms the movement of a valve rod in the direction far away from the lower valve rod cavity, a preset force spring for resetting the valve rod in the direction of the lower valve rod cavity is arranged on the valve rod, the valve seat and the valve plate divide a flow channel into an inflow flow channel and an outflow flow channel, an inflow pipeline is arranged between the inflow flow channel and the valve rod cavity, an inlet piston is hermetically arranged in the inflow pipeline, an outlet piston is hermetically arranged in the outflow pipeline, the outlet piston is provided with a blocking ring for blocking the movement of the outlet piston, and the inlet piston, the outlet piston, a part of the inflow pipeline, a part of the outflow pipeline and the upper valve rod cavity form a closed cavity. The invention provides a wellhead emergency cut-off device which can monitor the pressure difference of an inlet and an outlet of a valve without additional energy and electronic sensors.
Description
Technical Field
The invention relates to a cut-off device, in particular to a wellhead emergency cut-off device.
Background
The well head emergency cut-off device is important safety equipment of a petroleum and natural gas well field, when the pressure of a gas transmission pipeline is ultrahigh after primary throttling of the well head of an oil and gas field, or the pressure is reduced due to pipeline blasting, or fire and other sudden dangerous situations occur, in order to prevent further expansion of the dangerous situations and achieve the purpose of protecting the life safety of well field equipment and personnel, the well head is required to be rapidly and automatically closed, and the equipment for realizing the emergency closing of the well head is the well head emergency cut-off device.
The existing wellhead emergency cut-off device collects pressure signals of an inlet and an outlet of a valve through a monitoring instrument and feeds the pressure signals back to a control system, when the pressure difference of the inlet and the outlet reaches a set value, the control system closes the valve, but electronic equipment is introduced to monitor the pressure difference of the inlet and the outlet of the valve, the equipment is applied to environments such as petroleum and natural gas, once the electronic equipment has problems, potential safety hazards easily occur.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a wellhead emergency cut-off device which can monitor the pressure difference of an inlet and an outlet of a valve without an additional electronic sensor.
In order to achieve the purpose, the invention provides the following technical scheme: the valve comprises a valve body, a valve plate, a valve rod and a valve seat, wherein a flow channel for medium circulation is arranged in the valve body, the valve seat is arranged in the valve body, the valve rod drives the valve plate to move and is in sealing fit with the valve seat to form the seal of the flow channel, the other side, opposite to the valve seat, of the valve rod is provided with a valve rod cavity, a valve rod piston is arranged in the valve rod cavity and divides the valve rod cavity into an upper valve rod cavity and a lower valve rod cavity, the pressure difference between the upper valve rod cavity and the lower valve rod cavity forms the movement of the valve rod towards the direction away from the lower valve rod cavity, the valve rod is provided with a pre-set force spring for resetting the valve rod towards the direction of the lower valve rod cavity, the valve seat and the valve plate divide the flow channel into an inflow flow channel and an outflow channel, an inflow pipeline for communicating the inflow channel with the valve rod cavity is arranged between the outflow channel and the valve rod cavity, an outflow pipeline for communicating the outflow channel with the valve rod cavity is arranged between the outflow channel and the outflow channel, and an inlet piston is arranged in the inflow pipeline in a sealing manner, the outlet piston is arranged in the outflow pipeline in a sealing mode, a blocking ring used for preventing the outlet piston from moving is arranged on the other side, opposite to the valve rod cavity, of the outlet piston, the inlet piston, the outlet piston, a part of inflow pipeline, a part of outflow pipeline and the upper valve rod cavity form a closed cavity, the outlet piston is in a sealing state and an opening state, the sealing state is that the pressure of the outlet piston, caused by the pressure difference between the inflow runner and the outflow runner, is smaller than the bearing limit of the blocking ring, the outlet piston does not move, the opening state is that the pressure of the outlet piston, caused by the pressure difference between the inflow runner and the outflow runner, is larger than the bearing limit of the blocking ring, the blocking ring is broken, the outlet piston moves, and the volume of the closed cavity is increased.
By adopting the technical scheme, when the pressure difference between the inflow flow channel and the outflow flow channel is proper, the pressure in the inflow flow channel is linked with the upper valve rod cavity, the pressure difference between the upper valve rod cavity and the lower valve rod cavity drives the valve rod to compress the preset force spring, the valve plate is driven to move downwards so as to open the flow channel, a medium can flow through the flow channel at the moment, when the pressure difference between the inflow flow channel and the outflow flow channel is overlarge, the air pressure of one side, relatively close to the upper valve rod cavity, of the outlet piston is linked with the air pressure of the inflow flow channel, the air pressure of one side, relatively close to the outflow flow channel, of the outlet piston is linked with the air pressure of the outflow flow channel, namely the air pressures on the two sides of the outlet piston are respectively determined by the air pressures of the inflow flow channel and the outflow flow channel, the overlarge pressure difference between the inflow flow channel and the outflow channel can cause the pressure on the two sides of the outlet piston to be overlarge, so that the pressure of the outlet piston on the blocking ring is larger than the limit born by the blocking ring, the blocking ring is broken, then the outlet piston moves in the outflow pipeline, so that the volume of the closed cavity is increased, the pressure in the closed cavity is reduced, the acting force on the valve rod is reduced, the acting force of the pre-set force spring is greater than the acting force of the pressure difference on the valve rod, the valve rod resets upwards, the valve plate is in sealing fit with the valve seat to seal the flow channel, therefore, the bearing limit of the blocking ring can be changed, so that the flow channel is sealed when the pressure difference between the inflow flow channel and the outflow flow channel reaches a set value, the pressure difference between the inlet and the outlet of the valve is ensured not to be overlarge, the equipment is protected from being damaged, and after the flow channel is automatically cut off by the inlet emergency cut-off device once, the blocking ring is replaced after the operator finishes the inspection of the equipment, at the moment, the equipment can be put into use again, and the scheme is adopted, and no external power supply or other electronic sensors are needed, the product is safe and reliable, low in cost and wide in application range.
The invention is further configured to: the inlet pipeline is internally provided with a piston cavity, the inlet piston is arranged in the piston cavity and is in sealing fit with the piston cavity, the inlet piston divides the piston cavity into an upper piston cavity and a lower piston cavity, the upper piston cavity is communicated with the upper valve stem cavity, the lower piston cavity is communicated with the inlet flow channel, and the upper piston cavity is provided with an oil injection mechanism for injecting oil into the upper piston cavity.
By adopting the technical scheme, before the valve is used, the hydraulic oil is injected into the upper piston cavity through the oil injection mechanism, so that the closed cavity is filled with the hydraulic oil, namely, the air pressure flowing into the flow channel acts on the inlet piston, the hydraulic pressure acts on the valve rod, meanwhile, the hydraulic oil is sealed in the closed cavity, the hydraulic oil cannot be leaked, and the valve can be repeatedly used.
The invention is further configured to: and inlet switch valves are respectively arranged between the piston cavity and the inflow pipeline and between the piston cavity and the outflow pipeline.
By adopting the technical scheme, before the hydraulic oil is injected, the inlet switch valve far away from the upper valve rod cavity is closed, the inlet switch valve close to the upper valve rod cavity is opened, and then the hydraulic oil is injected, so that the hydraulic oil is ensured not to be influenced by an inflow flow channel when being injected.
The invention is further configured to: the outlet piston is T-shaped, the outflow pipeline comprises an upper outflow pipeline and a lower outflow pipeline, a piston shaft sleeve is arranged between the upper outflow pipeline and the lower outflow pipeline, a T-shaped cavity matched with the shape of the outlet piston is arranged in the piston shaft sleeve, the outlet piston is arranged in the T-shaped cavity, a cavity is further arranged in the piston shaft sleeve and communicated with the T-shaped cavity, a stop ring is arranged between the T-shaped cavity and the cavity, and the outlet piston and the stop ring form a partition between the T-shaped cavity and the cavity.
By adopting the technical scheme, when the blocking ring is subjected to overlarge pressure, the blocking ring is broken, the outlet piston enters the cavity, the vacant space of the T-shaped cavity is increased at the moment, and partial hydraulic oil enters the cavity, so that the pressure of the hydraulic oil on the valve rod is reduced, and the purpose of sealing the flow channel is achieved.
The invention is further configured to: the piston shaft sleeve comprises an upper shaft sleeve and a lower shaft sleeve, one end of the upper shaft sleeve is fixed on the upper outflow pipeline, the other end of the upper shaft sleeve is detachably fixed on the lower shaft sleeve, the other end of the lower shaft sleeve, relative to the upper shaft sleeve, is fixed on the lower outflow pipeline, the T-shaped cavity is arranged on the upper shaft sleeve, the cavity is arranged on the lower shaft sleeve, and the stop ring is arranged between the upper shaft sleeve and the lower shaft sleeve.
Through adopting above-mentioned technical scheme, after the barrier ring fracture, operating personnel has detected equipment to before preparing restart, through dismantling lower axle sleeve from the upper shaft sleeve, then change the barrier ring, install upper shaft sleeve and lower axle sleeve again, reach the reuse of whole device, only need change the barrier ring alright.
The invention is further configured to: and a sealing ring is arranged between the upper shaft sleeve and the outlet piston.
By adopting the technical scheme, hydraulic oil is prevented from leaking into the cavity from the upper shaft sleeve, and the closed cyclic use of the hydraulic oil is ensured.
The invention is further configured to: and outlet switch valves are respectively arranged between the upper shaft sleeve and the upper outflow pipeline and between the lower shaft sleeve and the lower outflow pipeline.
By adopting the technical scheme, when hydraulic oil is injected, the outlet switch valve is closed, so that the hydraulic oil cannot be influenced by the outflow flow channel.
The invention is further configured to: the valve body still include the export body, export body detachable be fixed in on the valve body and the outflow runner extends to the export body, the outflow pipeline sets up on the export body.
Through adopting above-mentioned technical scheme, when changing the barrier ring, can dismantle the whole export body at outflow pipeline place, make things convenient for the change of barrier ring.
The invention is further configured to: and an inlet pressure gauge is arranged on one side of the inflow pipeline, which is relatively close to the upper valve rod cavity, and an outlet pressure gauge is arranged on the outlet body.
By adopting the technical scheme, the arrangement of the inlet pressure gauge and the outlet pressure gauge ensures that an operator can control the pressure difference on two sides of the outlet piston at any time.
Drawings
FIG. 1 is a schematic structural view of the present invention as a whole;
FIG. 2 is a partial enlarged view A of the present invention;
FIG. 3 is a partial enlarged view B of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1-3, the invention discloses a wellhead emergency cut-off device, which comprises a valve body 1, a valve plate 2, a valve rod 3 and a valve seat 4, wherein a flow passage 5 for medium circulation is arranged in the valve body 1, the valve seat 4 is arranged in the valve body 1, the valve rod 3 drives the valve plate 2 to move and is in sealing fit with the valve seat 4 to form the seal of the flow passage 5, a valve rod cavity 31 is arranged on the other side of the valve rod 3 opposite to the valve seat 4, a valve rod piston 32 is arranged in the valve rod cavity 31, the valve rod cavity 31 is divided into an upper valve rod cavity 311 and a lower valve rod cavity 312 by the valve rod piston 32, the pressure difference between the upper valve rod cavity 311 and the lower valve rod cavity 312 forms the movement of the valve rod 3 in the direction far away from the lower valve rod cavity 312, a preset force spring 7 for resetting the valve rod 3 in the direction of the lower valve rod cavity 312 is arranged on the valve rod 3, the valve seat 4 and the valve plate 2 divide the flow passage 5 into an inflow flow passage 51 and an outflow passage 52, an inflow pipeline 61 for communicating the inflow passage 51 with the valve rod cavity 31 is arranged between the inflow passage 51 and the valve rod cavity 31, an outflow pipeline 62 for communicating the outflow channel 52 with the valve rod cavity 31 is arranged between the outflow channel 52 and the valve rod cavity 31, an inlet piston 612 is arranged in the inflow pipeline 61 in a sealing manner, an outlet piston 622 is arranged in the outflow pipeline 62 in a sealing manner, a blocking ring 623 for blocking the outlet piston 622 from moving is arranged on the other side of the outlet piston 622 relative to the valve rod cavity 31, the inlet piston 612, the outlet piston 622, a part of the inflow pipeline 61, a part of the outflow pipeline 62 and the upper valve rod cavity 311 form a closed cavity 6, the outlet piston 622 has a sealing state and an opening state, the sealing state is that the pressure of the outlet piston 622 caused by the pressure difference between the inflow channel 51 and the outflow channel 52 is smaller than the bearing limit of the blocking ring 623, the outlet piston 622 does not move, the opening state is that the pressure of the outlet piston 622 caused by the pressure difference between the inflow channel 51 and the outflow channel 52 is larger than the bearing limit of the blocking ring 623, the blocking ring 623 breaks, the outlet piston 622 moves, the volume of the closed cavity 6 is increased, when the pressure difference between the inflow channel 51 and the outflow channel 52 is moderate, the pressure in the inflow channel 51 is linked with the upper valve rod cavity 311, the valve rod 3 is driven by the pressure difference between the upper valve rod cavity 311 and the lower valve rod cavity 312 to compress the pre-set force spring 7, the valve plate 2 is driven to move downwards, so that the channel 5 is opened, at the moment, the medium can flow through the channel 5, when the pressure difference between the inflow channel 51 and the outflow channel 52 is too large, the air pressure on one side of the outlet piston 622 relatively close to the upper valve rod cavity 311 is linked with the air pressure in the inflow channel 51, the air pressure on one side of the outlet piston 622 relatively close to the outflow channel 52 is linked with the air pressure in the outflow channel 52, namely, the air pressures on two sides of the outlet piston 622 are respectively determined by the air pressures in the inflow channel 51 and the outflow channel 52, and the pressure difference between the inflow channel 51 and the outflow channel 52 is too large, which causes the pressure difference on two sides of the outlet piston 622 to be too large, the pressure of the outlet piston 622 on the blocking ring 623 is greater than the limit borne by the blocking ring 623, so that the blocking ring 623 is broken, then the outlet piston 622 moves in the outflow pipeline 62, so that the volume of the closed cavity 6 is increased, the air pressure in the closed cavity 6 is reduced, so that the acting force on the valve rod 3 is reduced, the acting force of the pre-set force spring 7 is greater than the acting force of the differential pressure borne by the valve rod 3, the valve rod 3 resets upwards, the valve plate 2 is in sealing fit with the valve seat 4 to close the flow channel 5, so that the bearing limit of the blocking ring 623 can be changed, the flow channel 5 is closed when the differential pressure between the inflow flow channel 51 and the outflow flow channel 52 reaches a set value, the differential pressure at the inlet and the outlet of the valve is ensured not to be too large, the protection equipment is not damaged, and after the flow channel 5 is automatically cut off by the inlet emergency cut-off device once, after an operator finishes the inspection of the equipment, the stop ring 623 is replaced, the device can be put into use again, and by adopting the scheme, an external power supply and other electronic sensors are not needed, so that the product is safe and reliable, low in cost and wide in application range.
The inflow pipe 61 is internally provided with a piston cavity 611, the inlet piston 612 is arranged in the piston cavity 611 and is in sealing fit with the piston cavity 611, the inlet piston 612 divides the piston cavity 611 into an upper piston cavity 6111 and a lower piston cavity 6112, the upper piston cavity 6111 is communicated with the upper valve rod cavity 311, the lower piston cavity 6112 is communicated with the inflow channel 51, the upper piston cavity 6111 is provided with an oiling mechanism 613 for oiling the upper piston cavity 6111, before use, hydraulic oil is injected into the upper piston cavity 6111 through the oiling mechanism 613, so that the closed cavity 6 is filled with the hydraulic oil, namely, the air pressure flowing into the channel 51 acts on the inlet piston 612, thereby enabling the hydraulic pressure to act on the valve rod 3, meanwhile, the hydraulic oil is sealed in the closed cavity 6, the hydraulic oil cannot leak, and can be reused.
The inlet open/close valves 63 are respectively provided between the piston chamber 611 and the inflow conduit 61 and between the piston chamber 611 and the outflow conduit 62, and before the hydraulic oil is injected, the inlet open/close valve 63 distant from the upper stem chamber 311 is closed, the inlet open/close valve 63 close to the upper stem chamber 311 is opened, and then the hydraulic oil is injected, thereby ensuring that the hydraulic oil is not affected by the inflow flow passage 51 when the hydraulic oil is injected.
The outlet piston 622 is T-shaped, the outflow pipeline 62 includes an upper outflow pipeline 624 and a lower outflow pipeline 625, a piston shaft sleeve 626 is arranged between the upper outflow pipeline 624 and the lower outflow pipeline 625, a T-shaped cavity 627 matched with the shape of the outlet piston 622 is arranged in the piston shaft sleeve 626, the outlet piston 622 is arranged in the T-shaped cavity 627, a cavity 621 is further arranged in the piston shaft sleeve 626, the cavity 621 is communicated with the T-shaped cavity 627, a blocking ring 623 is arranged between the T-shaped cavity 627 and the cavity 621, the outlet piston 622 and the blocking ring 623 form a partition between the T-shaped cavity 627 and the cavity 621, when the blocking ring 623 is subjected to an excessive pressure, the blocking ring 623 is broken, the outlet piston 622 enters the cavity 621, at this time, the vacant space of the T-shaped cavity 627 is increased, a part of hydraulic oil enters, so that the pressure of the hydraulic oil on the valve rod 3 is reduced, and the purpose of closing the flow passage 5 is achieved.
The piston shaft sleeve 626 comprises an upper shaft sleeve 6261 and a lower shaft sleeve 6262, one end of the upper shaft sleeve 6261 is fixed to the upper outflow pipeline 624, the other end of the upper shaft sleeve 6261 is detachably fixed to the lower shaft sleeve 6262, the other end of the lower shaft sleeve 6262 opposite to the upper shaft sleeve 6261 is fixed to the lower outflow pipeline 625, a T-shaped cavity 627 is arranged in the upper shaft sleeve 6261, a cavity 621 is arranged in the lower shaft sleeve 6262, a blocking ring 623 is arranged between the upper shaft sleeve 6261 and the lower shaft sleeve 6262, after the blocking ring 623 is broken, an operator detects the device and before the device is ready to be started again, the lower shaft sleeve 6262 is detached from the upper shaft sleeve 6261, then the blocking ring 623 is replaced, the upper shaft sleeve 6261 and the lower shaft sleeve 6262 are installed, the whole device is recycled, and only the blocking ring 623 needs to be replaced.
A sealing ring 628 is arranged between the upper shaft sleeve 6261 and the outlet piston 622, so that hydraulic oil cannot leak from the inside of the upper shaft sleeve 6261 to the cavity 621, and the closed cycle use of the hydraulic oil is guaranteed.
Outlet opening/closing valves 64 are provided between the upper bushing 6261 and the upper outflow conduit 624 and between the lower bushing 6262 and the lower outflow conduit 625, respectively, and when hydraulic oil is injected, the outlet opening/closing valves 64 are closed so that the hydraulic oil is not affected by the outflow conduit 52.
The valve body 1 further comprises an outlet body 11, the outlet body 11 is detachably fixed on the valve body 1, the outflow channel 52 extends to the outlet body 11, the outflow pipeline 62 is arranged on the outlet body 11, and when the blocking ring 623 is replaced, the outlet body 11 where the outflow pipeline 62 is located can be integrally detached, so that the blocking ring 623 is replaced conveniently.
An inlet pressure gauge 81 is arranged on one side of the inflow pipe 61 relatively close to the upper valve rod cavity 311, an outlet pressure gauge 82 is arranged on the outlet body 11, and the inlet pressure gauge 81 and the outlet pressure gauge 82 are arranged, so that an operator can control the pressure difference on two sides of the outlet piston 622 at any time.
Claims (9)
1. The utility model provides a well head promptly cuts device, includes valve body, valve plate, valve rod and disk seat, is provided with the runner that is used for the medium circulation in the valve body, and the disk seat sets up in the valve body, and valve rod drive valve plate removes and constitutes the closure to the runner with the sealed cooperation of disk seat, its characterized in that: the valve comprises a valve rod, a valve seat, a valve rod cavity, a valve rod piston, a valve rod spring, an inflow channel, an outflow channel, a blocking ring, an inlet piston, a valve rod cavity and a valve seat, wherein the valve rod cavity is arranged on the other side, opposite to the valve seat, matched with the valve seat, of the valve rod, the valve rod piston is arranged in the valve rod cavity, the valve rod piston divides the valve rod cavity into an upper valve rod cavity and a lower valve rod cavity, the pressure difference between the upper valve rod cavity and the lower valve rod cavity forms movement of the valve rod in the direction away from the lower valve rod cavity, the valve rod is provided with the pre-set force spring which resets the direction of the valve rod towards the lower valve rod cavity, the valve seat and the valve plate divide the flow channel into an inflow channel and an outflow channel, an inflow pipeline which communicates the inflow channel with the valve rod cavity is arranged between the inflow channel and the valve rod cavity, the outflow channel is provided with the valve rod cavity, the inlet piston is arranged in a sealing manner in the inflow pipeline, the outflow pipeline is provided with the outlet piston in a sealing manner, the other side, the outlet piston opposite to the valve rod cavity is provided with the blocking ring for preventing the outlet piston from moving, the inlet piston, the outlet piston, and the outlet piston, The outlet piston, a part of inflow pipeline, a part of outflow pipeline and the upper valve rod cavity form a closed cavity, the outlet piston has a sealing state and an opening state, the sealing state is that the pressure of the outlet piston, which is subjected to the pressure difference between the inflow channel and the outflow channel, is smaller than the bearing limit of the blocking ring, the outlet piston does not move, the opening state is that the pressure of the outlet piston, which is subjected to the pressure difference between the inflow channel and the outflow channel, is larger than the bearing limit of the blocking ring, the blocking ring is broken, the outlet piston moves, and the volume of the closed cavity is increased.
2. A wellhead emergency shut-off device according to claim 1 and wherein: the inlet pipeline is internally provided with a piston cavity, the inlet piston is arranged in the piston cavity and is in sealing fit with the piston cavity, the inlet piston divides the piston cavity into an upper piston cavity and a lower piston cavity, the upper piston cavity is communicated with the upper valve stem cavity, the lower piston cavity is communicated with the inlet flow channel, and the upper piston cavity is provided with an oil injection mechanism for injecting oil into the upper piston cavity.
3. A wellhead emergency shut-off device as claimed in claim 1, wherein: and inlet switch valves are respectively arranged between the piston cavity and the inflow pipeline and between the piston cavity and the outflow pipeline.
4. A wellhead emergency shut-off device as claimed in claim 1, wherein: the outlet piston is T-shaped, the outflow pipeline comprises an upper outflow pipeline and a lower outflow pipeline, a piston shaft sleeve is arranged between the upper outflow pipeline and the lower outflow pipeline, a T-shaped cavity matched with the shape of the outlet piston is arranged in the piston shaft sleeve, the outlet piston is arranged in the T-shaped cavity, a cavity is further arranged in the piston shaft sleeve and communicated with the T-shaped cavity, the stop ring is arranged between the T-shaped cavity and the cavity, and the outlet piston and the stop ring form a partition of the T-shaped cavity and the cavity.
5. A wellhead emergency shut-off device as claimed in claim 4, wherein: the piston shaft sleeve comprises an upper shaft sleeve and a lower shaft sleeve, one end of the upper shaft sleeve is fixed on the upper outflow pipeline, the other end of the upper shaft sleeve is detachably fixed on the lower shaft sleeve, the other end of the lower shaft sleeve, relative to the upper shaft sleeve, is fixed on the lower outflow pipeline, the T-shaped cavity is arranged on the upper shaft sleeve, the cavity is arranged on the lower shaft sleeve, and the stop ring is arranged between the upper shaft sleeve and the lower shaft sleeve.
6. A wellhead emergency shut-off device as claimed in claim 5, wherein: and a sealing ring is arranged between the upper shaft sleeve and the outlet piston.
7. A wellhead emergency shut-off device as claimed in claim 5, wherein: and outlet switch valves are respectively arranged between the upper shaft sleeve and the upper outflow pipeline and between the lower shaft sleeve and the lower outflow pipeline.
8. A wellhead emergency shut-off device as claimed in claim 1, wherein: the valve body still include the export body, export body detachable is fixed in on the valve body and the outflow runner extends to the export body, the outflow pipeline sets up on the export body.
9. A wellhead emergency shut-off device as claimed in claim 8, wherein: and an inlet pressure gauge is arranged on one side of the inflow pipeline, which is relatively close to the upper valve rod cavity, and an outlet pressure gauge is arranged on the outlet body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210302519.XA CN114607813B (en) | 2022-03-24 | Wellhead emergency cutting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210302519.XA CN114607813B (en) | 2022-03-24 | Wellhead emergency cutting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114607813A true CN114607813A (en) | 2022-06-10 |
| CN114607813B CN114607813B (en) | 2024-07-30 |
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| CN216841545U (en) * | 2022-03-24 | 2022-06-28 | 君品集团有限公司 | Well head promptly cuts device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2008131237A (en) * | 2008-07-28 | 2010-02-10 | Открытое акционерное общество "НПО "Промавтоматика" (RU) | VALVE VALVE-CONTROLLING SHUT-OFF |
| CN203363202U (en) * | 2013-07-10 | 2013-12-25 | 宁波埃美柯铜阀门有限公司 | Piston type stop valve |
| CN203948070U (en) * | 2013-11-04 | 2014-11-19 | 西安东新石油设备厂有限公司 | A kind of high-pressure natural gas well head remote measuring and controlling safety shut-off valve device of four functions |
| CN104196483A (en) * | 2014-08-26 | 2014-12-10 | 乐山倍创机械制造有限公司 | Pneumatic wellhead shut-off device |
| CN204127447U (en) * | 2014-09-29 | 2015-01-28 | 保一集团有限公司 | A kind of adjustable Emergeny Cutoff Valves |
| CN109973694A (en) * | 2019-04-11 | 2019-07-05 | 浙江班尼戈流体控制有限公司 | A kind of booster stop valve |
| CN112145124A (en) * | 2020-09-30 | 2020-12-29 | 陕西百豪科技发展有限责任公司 | Natural gas well head and pipeline electromechanical double-control intelligent emergency cut-off device |
| CN216841545U (en) * | 2022-03-24 | 2022-06-28 | 君品集团有限公司 | Well head promptly cuts device |
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