CN111577200A - Emergency cut-off device with remote control and local mechanical control functions - Google Patents
Emergency cut-off device with remote control and local mechanical control functions Download PDFInfo
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- CN111577200A CN111577200A CN202010619455.7A CN202010619455A CN111577200A CN 111577200 A CN111577200 A CN 111577200A CN 202010619455 A CN202010619455 A CN 202010619455A CN 111577200 A CN111577200 A CN 111577200A
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- inlet
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000003345 natural gas Substances 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geophysics (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses an emergency cut-off device with remote control and local mechanical control functions.A compressor is connected with a solenoid valve, a quick release valve and a pneumatic actuator, the pneumatic actuator drives the emergency cut-off valve, the inlet of the emergency cut-off valve is connected with a wellhead natural gas pipeline, a pressure transmitter for detecting the pressure of wellhead natural gas and the solenoid valve are respectively and correspondingly connected with a controller, a three-way valve is respectively connected with the outlet of the solenoid valve, the inlet of the quick release valve and the outlet port of a high-low pressure pilot valve, the inlet of the emergency cut-off valve is simultaneously connected with the high-low pressure port of the high-low pressure pilot valve, and the inlet port of the high-low pressure pilot valve is connected. The invention can realize remote automatic or manual control of the emergency cut-off valve through the controller, and can realize local automatic control of the emergency cut-off valve through the high-low pressure pilot valve, thereby obviously improving the reliability and the accuracy of monitoring the natural gas pressure of a well mouth and better putting an end to the potential safety hazard.
Description
Technical Field
The invention relates to an emergency cut-off device mainly used for on-off control of a natural gas wellhead gas pipe, in particular to an emergency cut-off device with remote control and local mechanical control functions.
Background
In order to avoid the influence of over-high or over-low air pressure on related natural gas equipment, an emergency cut-off valve is installed on a natural gas well mouth air pipe, the emergency cut-off valve is closed when the air pressure is over-high or over-low, and natural gas conveying is stopped, so that high-pressure and low-pressure protection of natural gas is realized, wherein the high-pressure protection can effectively prevent accidents such as natural gas leakage caused by burst of a downstream pipeline, and the low-pressure protection can effectively protect a gas well from being sealed by water due to insufficient pressure.
The emergency cut-off valve generally realizes a switching function through a pneumatic actuator, the pneumatic actuator takes clean and dry compressed air as a power source and comprises an air cylinder, a spring, a transmission rod and the like, when compressed air is input, the pneumatic actuator drives the emergency cut-off valve to be in an open state, and when no compressed air is input, the pneumatic actuator drives the emergency cut-off valve to be in a closed state. The devices including the slam shut valve, pneumatic actuator and other compressed air supply equipment are collectively referred to as slam shut devices.
The traditional emergency cut-off device adopts a remote control mode and comprises an emergency cut-off valve, a pneumatic actuator, a quick release valve, an electromagnetic valve, a pressure regulating valve, a filter, an air compressor, a pressure transmitter and a controller, wherein a compressed air outlet of the air compressor is sequentially connected with the filter, the pressure regulating valve, the electromagnetic valve, the quick release valve and an air cylinder inlet of the pneumatic actuator, and the controller generally adopts a PLC (programmable logic controller); the pressure transmitter is a pressure sensor and is arranged on a natural gas wellhead gas pipe and used for detecting the pressure of the natural gas at the wellhead and transmitting a signal to the controller; when the pressure of natural gas at a wellhead is normal, the controller controls the electromagnetic valve to be in an open state, and the pneumatic actuator is provided with compressed air input to drive the emergency cut-off valve to be in an open state; when the pressure of natural gas at the wellhead is too high or too low, the controller controls the electromagnetic valve to be in a disconnected state, the pneumatic actuator does not input compressed air, and the emergency cut-off valve is driven to be in a disconnected state, so that the purpose of safety protection is achieved.
The above conventional emergency cut-off device has drawbacks in that: when a communication cable between the controller and the pressure transmitter or the electromagnetic valve is damaged or a transmission signal is interfered, the control delay or failure of the electromagnetic valve can be caused, and finally the opening and closing of the emergency cut-off valve are not timely; the control form is single, and if the pressure transmitter, the controller or the electromagnetic valve fails, the automatic opening and closing of the emergency cut-off valve cannot be realized; the reliability and the accuracy of monitoring the natural gas pressure at the well mouth are reduced, and the potential safety hazard caused by overhigh or overlow natural gas pressure at the well mouth is not avoided.
Disclosure of Invention
The present invention is directed to solving the above problems by providing an emergency shutdown device having both remote control and local machine control functions.
The invention realizes the purpose through the following technical scheme:
an emergency cut-off device with remote control and local mechanical control functions comprises an emergency cut-off valve, a pneumatic actuator, a quick release valve, an electromagnetic valve, an air compressor, a pressure transmitter and a controller, wherein a compressed air outlet of the air compressor is sequentially connected with the electromagnetic valve, the quick release valve and an air cylinder inlet of the pneumatic actuator, a transmission rod of the pneumatic actuator is connected with a valve rod of the emergency cut-off valve, an inlet of the emergency cut-off valve is connected with a wellhead natural gas pipeline, the pressure transmitter is used for detecting the pressure of the wellhead natural gas, a signal output end of the pressure transmitter is connected with a signal input end of the controller, and a control input end of the electromagnetic valve is connected with a control output end of the controller; the emergency cut-off device further comprises a three-way valve and a high-low pressure pilot valve, a first port of the three-way valve is connected with an outlet of the electromagnetic valve, a second port of the three-way valve is connected with an inlet of the rapid relief valve, a third port of the three-way valve is connected with an air outlet port of the high-low pressure pilot valve, the three-way valve is used for controlling the conduction of the second port of the three-way valve and the first port or the third port, an inlet of the emergency cut-off valve is simultaneously connected with high-low pressure ports of the high-low pressure pilot valve, and an air inlet port of the high-low pressure pilot valve is connected with an.
In the structure, the emergency cut-off valve, the pneumatic actuator, the quick release valve, the electromagnetic valve, the air compressor, the pressure transmitter, the controller, the three-way valve and the high-low pressure pilot valve all adopt conventional parts and equipment in the prior art, and the key point of the invention is that all the parts and the equipment are organically integrated to form a new system, so that the system has the functions of remote control and local mechanical control; the air circuit is a remote control air circuit, and the other air circuit is an air compressor → an electromagnetic valve (if the air inlet port of the high-low pressure pilot valve is connected with the outlet of the electromagnetic valve, the air circuit is provided with the electromagnetic valve), and if the air inlet port of the high-low pressure pilot valve is connected with the inlet of the electromagnetic valve, the air circuit is not provided with the electromagnetic valve) → the high-low pressure pilot valve → the quick release valve → the pneumatic actuator, and the air circuit is a local mechanical control air circuit; the high-low pressure pilot valve is also called a high-low pressure valve, a high-low pressure stop valve and the like, and the basic working principle is as follows: when the gas pressure connected with the high pressure port and the low pressure port of the high-low pressure pilot valve is larger than a preset high pressure value or smaller than a preset low pressure value, the gas inlet port and the gas outlet port of the high-low pressure pilot valve are disconnected, and otherwise, the gas inlet port and the gas outlet port of the high-low pressure pilot valve are connected. The invention utilizes the working principle of the high-low pressure pilot valve to realize the automatic detection of the pressure of the wellhead natural gas in the wellhead natural gas pipeline, and once the pressure is too high or too low, the high-low pressure pilot valve is disconnected, the gas source of the quick release valve is cut off, the quick release valve is enabled to quickly discharge the compressed air in the cylinder of the pneumatic actuator, and the pneumatic actuator drives the emergency cut-off valve to close.
Further, in order to facilitate connection, an inlet of the emergency cut-off valve is connected with an inlet of the manual valve, an outlet of the manual valve is connected with an inlet of the three-way joint, and two outlets of the three-way joint are respectively connected with a high pressure port and a low pressure port of the high-low pressure pilot valve.
Preferably, in order to integrate most parts of the device, a first end of the pressure taking gas pipe is connected with high and low pressure ports of the high and low pressure pilot valve, and a through hole which is communicated with the inside and the outside is arranged on the pipe wall of the inlet side of the emergency cut-off valve and is hermetically connected with a second end of the pressure taking gas pipe; or the wellhead natural gas pipeline can also be connected with the second end of the pressure taking gas pipe in parallel, and the functions are the same.
According to actual needs, the three-way valve is a manual three-way ball valve or an electric three-way electromagnetic valve; and if the three-way valve is an electric three-way electromagnetic valve, the control input end of the three-way valve is connected with the control output end of the controller. Therefore, the switching of the two air channels can be controlled locally and manually or remotely according to the requirement.
The invention has the beneficial effects that:
the invention realizes the selective conversion of two gas circuits by adding the three-way valve and the high-low pressure pilot valve and connecting the three-way valve and the high-low pressure pilot valve in parallel at the front end of the quick relief valve, on one hand, the remote automatic or manual control of the emergency relief valve can be realized through the controller, on the other hand, the local automatic control of the emergency relief valve can be realized through the high-low pressure pilot valve, the local control is a pure mechanical structure, the invention is not influenced by the control failure or delay possibly caused by the damage of a communication cable or the interference of a transmission signal, the control mode can be selected, the automatic opening and closing of the emergency relief valve can be still realized when a pressure transmitter, the controller or an electromagnetic valve fails, the reliability and the accuracy of the monitoring of the natural gas pressure of a wellhead are obviously improved, and the potential safety.
Drawings
FIG. 1 is a perspective view of the emergency disconnect device of the present invention with both remote control and local mechanical control, not shown with a wellhead natural gas line;
fig. 2 is a schematic diagram of the structure of the emergency cut-off device with remote control and local mechanical control functions according to the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1 and fig. 2, the emergency cut-off device with both remote control and local mechanical control functions of the invention comprises an emergency cut-off valve 11, a pneumatic actuator 3, a quick release valve 1, a solenoid valve 6, an air compressor (i.e. air compressor, not shown), a pressure transmitter (i.e. pressure sensor, not shown), a controller (preferably PLC, not shown), a three-way valve 9 and a high-low pressure pilot valve 5, wherein a compressed air outlet of the air compressor is sequentially connected with cylinder inlets of the solenoid valve 6, the quick release valve 1 and the pneumatic actuator 3, a transmission rod of the pneumatic actuator 3 is connected with a valve rod of the emergency cut-off valve 11, an inlet of the emergency cut-off valve 11 is connected with a wellhead natural gas pipeline 12, the pressure transmitter is used for detecting wellhead natural gas pressure, and a signal output end, the control input end of the electromagnetic valve 6 is connected with the control output end of the controller; a first port of the three-way valve 9 is connected with an outlet of the electromagnetic valve 6, a second port of the three-way valve 9 is connected with an inlet of the quick release valve 1, a third port of the three-way valve 9 is connected with an air outlet port of the high-low pressure pilot valve 5, the three-way valve 9 is used for controlling the conduction of the second port of the three-way valve 9 with the first port or the third port, an inlet of the emergency cut-off valve 11 is simultaneously connected with the high-low pressure port of the high-low pressure pilot valve 5, and an air inlet port of the high-low pressure pilot valve 5 is connected with an outlet of the electromagnetic valve 6.
Fig. 1 and 2 also show a filter 8 for filtering compressed air, a pressure regulating valve 7 for regulating the pressure of the compressed air, and an indicator switch 2 provided on the pneumatic actuator 3, which are of adaptive conventional construction.
As shown in fig. 1 and 2, during use, the air compressor generates compressed air and sends the compressed air to the inlet of the electromagnetic valve 6, and then determines which air path enters the cylinder of the pneumatic actuator 3 according to the selection of the three-way valve 9, wherein the two air paths are respectively: the first air path is an air compressor → the electromagnetic valve 6 → the quick release valve 1 → the pneumatic actuator 3, the air path is a remote control air path, and the second air path is an air compressor → the electromagnetic valve 6 (if the air inlet port of the high-low pressure pilot valve 5 is connected with the outlet of the electromagnetic valve 6, the air path has the electromagnetic valve 6, in this example, the electromagnetic valve 6 is provided, if the air inlet port of the high-low pressure pilot valve 5 is connected with the inlet of the electromagnetic valve 6, the air path does not have the electromagnetic valve 6) → the high-low pressure pilot valve 5 → the quick release valve 1 → the pneumatic actuator 3, and the air path is a local mechanical control air path.
If the first air passage is selected, the control principle of the emergency cut-off device is as follows: if the pressure of the wellhead natural gas in the wellhead natural gas pipeline 12 is normal, the controller controls the electromagnetic valve 6 to be in an opening state, the air inlet of the rapid relief valve 1 keeps high pressure and does not exhaust, the pneumatic actuator 3 drives the emergency cut-off valve 11 to be in a conducting state, and the wellhead natural gas in the wellhead natural gas pipeline 12 is normally conveyed to downstream equipment; if the pressure of the wellhead natural gas in the wellhead natural gas pipeline 12 is too high or too low, the pressure transmitter sends the signal to the controller, the controller controls the electromagnetic valve 6 to be in a closed state, the air inlet of the quick release valve 1 loses high pressure, the air is quickly exhausted, the pneumatic actuator 3 drives the emergency cut-off valve 11 to be in a closed state, the wellhead natural gas in the wellhead natural gas pipeline 12 cannot be conveyed to downstream equipment, and safety accidents are avoided.
If the second air path is selected, the control principle of the emergency cut-off device is as follows: if the pressure of the wellhead natural gas in the wellhead natural gas pipeline 12 is normal, the gas inlet port and the gas outlet port of the high-low pressure pilot valve are kept communicated, the gas inlet of the rapid relief valve 1 keeps high pressure and cannot exhaust gas, the pneumatic actuator 3 drives the emergency cut-off valve 11 to be in a communicated state, and the wellhead natural gas in the wellhead natural gas pipeline 12 is normally conveyed to downstream equipment; if the pressure of the wellhead natural gas in the wellhead natural gas pipeline 12 is too high or too low, the inlet port and the outlet port of the high-low pressure pilot valve are automatically disconnected, the air inlet of the quick release valve 1 loses high pressure, quick exhaust is realized, the pneumatic actuator 3 drives the emergency cut-off valve 11 to be in a closed state, the wellhead natural gas in the wellhead natural gas pipeline 12 cannot be conveyed to downstream equipment, and safety accidents are avoided.
As shown in fig. 1 and fig. 2, the present invention further discloses a plurality of optimized specific structures, and the structures can be combined with one or more of the structures in an overlapping manner according to actual needs to form a new and more optimized technical solution.
For convenience of connection, an inlet of the emergency cut-off valve 11 is connected with an inlet of the manual valve 4, an outlet of the manual valve 4 is connected with an inlet of a three-way joint 10, two outlets of the three-way joint 10 are respectively connected with a high-pressure port and a low-pressure port of the high-pressure and low-pressure pilot valve 5, and the three-way joint 10 can have a switching function.
In order to integrate most parts of the device together, a first end of a pressure taking pipe (not marked in the figure) is connected with high and low pressure ports of a high and low pressure pilot valve 5, a through hole which is communicated with the inside and the outside is arranged on the pipe wall of the inlet side of the emergency cut-off valve 11, and the through hole is connected with a second end of the pressure taking pipe in a sealing way; or the second end of the pressure taking pipe can be connected with the wellhead natural gas pipeline 12 in parallel, and the functions are the same. In the case of manual valve 4 and three-way joint 10, a first end of a pressure-taking pipe (not shown) is connected to an inlet of manual valve 4.
According to actual needs, the three-way valve 9 is a manual three-way ball valve or an electric three-way electromagnetic valve; if the three-way valve is an electric three-way electromagnetic valve, the control input end of the three-way valve 9 is connected with the control output end of the controller. Therefore, the switching of the two air channels can be controlled locally and manually or remotely according to the requirement.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.
Claims (4)
1. An emergency cut-off device with remote control and local mechanical control functions comprises an emergency cut-off valve, a pneumatic actuator, a quick release valve, an electromagnetic valve, an air compressor, a pressure transmitter and a controller, wherein a compressed air outlet of the air compressor is sequentially connected with the electromagnetic valve, the quick release valve and an air cylinder inlet of the pneumatic actuator, a transmission rod of the pneumatic actuator is connected with a valve rod of the emergency cut-off valve, an inlet of the emergency cut-off valve is connected with a wellhead natural gas pipeline, the pressure transmitter is used for detecting the pressure of the wellhead natural gas, a signal output end of the pressure transmitter is connected with a signal input end of the controller, and a control input end of the electromagnetic valve is connected with a control output end of the controller; the method is characterized in that: the emergency cut-off device further comprises a three-way valve and a high-low pressure pilot valve, a first port of the three-way valve is connected with an outlet of the electromagnetic valve, a second port of the three-way valve is connected with an inlet of the rapid relief valve, a third port of the three-way valve is connected with an air outlet port of the high-low pressure pilot valve, the three-way valve is used for controlling the conduction of the second port of the three-way valve and the first port or the third port, an inlet of the emergency cut-off valve is simultaneously connected with high-low pressure ports of the high-low pressure pilot valve, and an air inlet port of the high-low pressure pilot valve is connected with an.
2. The emergency shutdown device of claim 1, further comprising a remote control and a local mechanical control, wherein: the inlet of the emergency cut-off valve is connected with the inlet of the manual valve, the outlet of the manual valve is connected with the inlet of the three-way joint, and the two outlets of the three-way joint are respectively connected with the high-pressure port and the low-pressure port of the high-pressure and low-pressure pilot valve.
3. Emergency cut-off device with both remote control and local mechanical control functions according to claim 1 or 2, characterized in that: the first end of the pressure taking air pipe is connected with the high-pressure port and the low-pressure port of the high-pressure and low-pressure pilot valve, the pipe wall of the inlet side of the emergency cut-off valve is provided with a through hole which is communicated with the inside and the outside, and the through hole is hermetically connected with the second end of the pressure taking air pipe; or the wellhead natural gas pipeline is connected with the second end of the pressure taking gas pipe in parallel.
4. Emergency cut-off device with both remote control and local mechanical control functions according to claim 1 or 2, characterized in that: the three-way valve is a manual three-way ball valve or an electric three-way electromagnetic valve; and if the three-way valve is an electric three-way electromagnetic valve, the control input end of the three-way valve is connected with the control output end of the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010619455.7A CN111577200A (en) | 2020-07-01 | 2020-07-01 | Emergency cut-off device with remote control and local mechanical control functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010619455.7A CN111577200A (en) | 2020-07-01 | 2020-07-01 | Emergency cut-off device with remote control and local mechanical control functions |
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| Publication Number | Publication Date |
|---|---|
| CN111577200A true CN111577200A (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010619455.7A Pending CN111577200A (en) | 2020-07-01 | 2020-07-01 | Emergency cut-off device with remote control and local mechanical control functions |
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| CN (1) | CN111577200A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116085520A (en) * | 2023-04-04 | 2023-05-09 | 南京荣晟自动化设备有限公司 | Emergency cut-off adjusting multifunctional valve and use method thereof |
-
2020
- 2020-07-01 CN CN202010619455.7A patent/CN111577200A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116085520A (en) * | 2023-04-04 | 2023-05-09 | 南京荣晟自动化设备有限公司 | Emergency cut-off adjusting multifunctional valve and use method thereof |
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