CN201176863Y - Pressure and flow controlled gas recovery well head safety closing device - Google Patents
Pressure and flow controlled gas recovery well head safety closing device Download PDFInfo
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- CN201176863Y CN201176863Y CNU2008200801476U CN200820080147U CN201176863Y CN 201176863 Y CN201176863 Y CN 201176863Y CN U2008200801476 U CNU2008200801476 U CN U2008200801476U CN 200820080147 U CN200820080147 U CN 200820080147U CN 201176863 Y CN201176863 Y CN 201176863Y
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Abstract
The utility model relates to a gas recovery well mouth safety shutdown device controlled by pressure and flow rate, comprising a pressure difference control valve, a high-pressure sensor, a low-pressure sensor and a shutdown cylinder and also comprising a flow controller, wherein a flow control shutdown valve core is arranged inside a flow control valve body; the shutdown cylinder is arranged on the upper part of the flow control valve body and provided with a hollow piston and a piston rod; central holes of the piston and the piston rod are communicated with gas recovered by a well mouth; the shutdown valve core of the flow controller is hung at the bottom of the piston rod of the shutdown cylinder; an upper cavity and a lower cavity of the pressure difference control valve are respectively communicated with an upper cavity and a lower cavity of the piston of the shutdown cylinder; air ports at the bottoms of the high-pressure sensor and the low-pressure sensor are also communicated with the lower cavity of the piston of the shutdown cylinder; and pressure release holes on the two sensors are all communicated with the atmosphere. The gas recovery well mouth safety shutdown device not only has all the functions of a general oil gas well mouth safety device but also can still cut off a gas source under the condition of failure of the pressure sensors, thereby increasing the reliability of safety protection of a high-pressure oil gas well, a low-pressure oil gas well and a natural gas well.
Description
Technical field
The utility model belongs to petroleum gas safety in production equipment manufacturing technology field, relates in particular to a kind of gas production wellhead safety shutdown device by pressure and flow-control.
Background technology
In the prior art, for reducing natural gas well cost of production, natural gas is reduced to several MPa by tens Mpa after well head carries out the step-down processing, enter the low pressure gas transmission line of long distance again.
Block up for preventing that hydrate forms ice in the natural gas in well head and conveyance conduit pipeline; except in well head is given well, annotating the alcohol; also a large amount of the employing in a certain well depth oil pipe of (the well temperature at this well depth place is enough to prevent that step-down is icing) is lowered to the throttling dropping equipment; this also is one of effective method that prevents that hydrate from freezing, but the problem of seal failure appears in this device regular meeting.After the seal failure, step-down was lost efficacy thereupon, and it is identical that natural gas well mouth pressure and bottom pressure are close to, and just high-pressure natural gas will enter the low pressure gas transmission line, as the untimely natural gas well head of closing, will cause accidents such as booster, and consequence is very serious.Each gas field adopts the natural gas downhole choke to reduce the gas well of pressure at home at present, all adopts safety shutoff valve.Make signal source by pressure sensor, commander closes the well head high-pressure natural gas.The shortcoming of prior art is: if pressure sensor is malfunctioning, do not have other means can close the natural gas well head again, no matter this is electromechanical integration or pneumatic control, is not always the case.The design of adopting electromechanical integration is also arranged in existing technology simultaneously, and to the western desert area of China, natural gas well head unmanned, well head do not have electricity, are unpractical yet.
Summary of the invention
The purpose of this utility model provides a kind of gas production wellhead safety shutdown device by pressure and flow-control, it can control the well head closing problem that gas recovery well surpasses high pressure setting value (for example 6MPa) or low pressure setting value (for example 0.5MPa), be provided at simultaneously pressure sensor malfunctioning after, by the safety shutdown device of flow-control.All operations are the gas production pressure of this well head, no external impetus control source.
For achieving the above object, the utility model is taked following design scheme:
A kind of gas production wellhead safety shutdown device by pressure and flow-control includes differential pressure control valve, high pressure sensor, low pressure sensor and shifter cylinder;
It also comprises a flow control valve, and this flow control valve body is located in the path of gas wellhead equipment after reducing pressure and between the external transport pipeline, in the flow-control valve body, flow-control is installed closes spool;
Described shifter cylinder places the top of flow-control valve body, has the piston and the piston rod of a hollow, and the mesopore of piston and piston rod communicates with well head institute gas production; Above-mentioned flow control valve close the piston rod bottom that spool is suspended on shifter cylinder;
The upper and lower chamber of described differential pressure control valve communicates with the upper and lower chamber of described shifter cylinder piston respectively;
Described high pressure sensor and low pressure sensor bottom gas port also communicates with the cavity of resorption of shifter cylinder piston, and the relief hole on two sensors then all communicates with atmosphere.
The utility model has the advantages that: the utility model not only has the repertoire of general gas production wellhead safety device, and can still can block source of the gas under the malfunctioning situation of pressure sensor, has increased the reliability of gas production wellhead safeguard protection; Secondly; the utility model scope of application is wide; it need not external power supply; also dispense with outer connecting power; can finish the overpressure protection of low pressure gas transmission line and the protection after the line break automatically, be specially adapted to western bleak and desolate desert of China and area, Gobi desert and do well head safe protection shutoff devices uses such as the high and low pressure oil gas well and the natural gas well.
Description of drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is the differential pressure controller structural representation in the utility model.
Fig. 3 is the high pressure sensor structural representation in the utility model.
Fig. 4 is the low pressure sensor structural representation in the utility model.
Fig. 5 is the shifter cylinder structural representation in the utility model.
Fig. 6 is the flow control valve structural representation in the utility model.
Below in conjunction with accompanying drawing the utility model is described in further details:
The specific embodiment
Consult shown in Figure 1ly, the utility model includes differential pressure control valve 1, high pressure sensor 2, low pressure sensor 3 and shifter cylinder 4 by the gas production wellhead safety shutdown device of pressure and flow-control, and it also comprises a flow control valve 5.
Referring to shown in Figure 2, be provided with differential pressure control valve core 7 in described differential pressure control valve 1 valve body 10, sealing ring 8 (the duplex sealing ring is good) is equipped with on spool 7 tops, cavity of resorption at spool is equipped with back-moving spring 9, the upper port of differential pressure control valve is connected with the stop valve 6 that resets, and the lower end of differential pressure control valve is equipped with the pressure meter 11 of checking cavity pressure under the closure piston.
Referring to shown in Figure 3, being equipped with in the pressure chamber of described high pressure sensor 2 can be for the sensor spring 12 of regulating the high-pressure setting valve, spring 12 is pressed on seal cover 13 tops, the sealing cage is on the lower seal boss 14 on the body, pressure chamber is offered the passage 15 that communicates with the shifter cylinder cavity of resorption, also offers the relief hole 16 that communicates with atmosphere.
Referring to shown in Figure 4, be processed with a downward seal boss 18 on the body of described low pressure sensor 3, lower sealing cover 19 is against on the seal boss, low pressure sensor spring 17 is installed in the inner chamber of seal boss 18, be pressed on the lower sealing cover 19 by adjusting rod 21, lower sealing cover place cavity 20 communicates with the closure piston cavity of resorption, also offers the relief hole 22 that communicates with atmosphere.
Referring to shown in Figure 5, piston 24 is installed in the described shifter cylinder, sealing device 25 is arranged on the piston, piston rod 27 is an one with piston 24, piston rod and piston middle part have mesopore 28, bar has sealing ring 29 outward, the top of mesopore 28 passes to piston upper chamber, the gas phase of the bottom of mesopore 28 and well head input is logical, piston upper chamber is offered and is used for the passage 32 that is communicated with the differential pressure pickup epicoele, piston cavity of resorption 26 is offered and is used for passage 30 that is communicated with the differential pressure pickup cavity of resorption and the passage 31 that is communicated with the differential pressure control valve cavity of resorption, and epicoele top is equipped with detected pressures table 23.
Referring to shown in Figure 6, at first in the path of gas wellhead equipment after reducing pressure and between the external transport pipeline, safety shutdown device body 42 is set, it has the valve seat 40 at a formation well head natural gas input port 33 and the delivery outlet 34 passage outposts of the tax office, be equipped with precompressed back-moving spring 41 in the endoporus of valve seat 40, what flow control valve was established in its upper end closes spool 35, duplex sealing ring 36 is equipped with in the spool upper end, two half snap rings 38 are housed in the circular groove of the lower end 39 of shifter cylinder piston rod 27, to close spool and be suspended on the piston rod 27 of shifter cylinder with hanging nut 37, the mesopore 28 that the position of suspension and piston rod 27 extended length can guarantee piston rod 27 communicates with well head institute gas production; Close 35 of spools on precompressed back-moving spring 41.
As shown in Figure 1, described shifter cylinder 4 places the top of flow control valve, flow control valve close the piston rod bottom that spool is suspended on shifter cylinder; The upper and lower chamber of described differential pressure control valve 1 communicates with the upper and lower chamber of described shifter cylinder piston respectively; Described high pressure sensor 2 and low pressure sensor 3 bottom gas ports also communicate with the cavity of resorption of shifter cylinder piston.
Described gas recovery well comprises the high and low pressure oil gas well and the natural gas well etc., and below to be example with the natural gas well describe the operating principle and the process of the utility model well head safe shutoff device:
Operating principle of the present utility model is: after pressure sensor (high pressure or low pressure) surpasses the force value of setting, moment and atmosphere are connected, piston cavity of resorption in the shut off valve and atmosphere are connected and are become low pressure, meanwhile, the cavity of resorption of differential pressure controller becomes low pressure, the high-pressure natural gas of differential pressure controller epicoele is flowed through the differential pressure controller valve and it is closed, and remains high pressure to keep the piston upper chamber in the shut off valve, so descent of piston promotes to close the gas circuit that spool is closed natural gas.If high pressure sensor or low pressure sensor are malfunctioning, the utility model still can accomplish to close the safeguard protection work of high-pressure air source.When high pressure sensor is malfunctioning, high-pressure natural gas (for example 30MPa) will enter low pressure gas line network (for example 6MPa), and under so big pressure reduction, the well head gas discharge will increase suddenly, behind the gap by the flow control valve spool, form pressure and will fall.This moment, to close the spool epicoele be high pressure, and cavity of resorption is a low pressure, closes so be about to the gas circuit of well head natural gas under the spool.In like manner, as the external transport pipeline fracture, and this moment, low pressure sensor was malfunctioning, formed pressure reduction equally, and the gas discharge of Zeng Daing will pass through the flow control valve device suddenly, and closes gas circuit.
The course of work of the present utility model is as follows: the utility model is installed in any position of gas wellhead equipment after reducing pressure and between the external transport pipeline and all can.Under normal circumstances, entered by input channel 33 of the present utility model through the well head natural gas of decompression, the side opening of closing spool by flow-control enters output channel then, thereby enters the low pressure gas pipeline.At this moment, differential pressure control valve upper and lower side pressure is identical, spool 7 is under the effect of back-moving spring 9, stay open state, so the following cavity pressure of closure piston is identical with the pressure of piston upper chamber, under the effect of back-moving spring 41, all the time be in tip position, close spool 35 in open mode, and shifter cylinder piston cavity of resorption 26 communicates with the pressure chamber that is full of the well head natural gas in high pressure sensor and the low pressure sensor by interface channel 30, but all be in sealing state.As the pressure that high pressure sensor occurs has surpassed setting value; seal cover will break away from the sealing surface of boss 14 in the high pressure sensor at this moment; moment is connected the gas pressure in the closure piston cavity of resorption 26 by passage 15 by relief hole 16 and atmosphere; meanwhile; by passage 37 cavity of resorption of differential pressure control valve and atmosphere are connected; this moment, the epicoele of spool 7 was still the well head gas pressure; so natural gas flows downward by the gap between spool and the valve body; form resistance pressure reduction; and make spool close valve for pressure difference; so the shifter cylinder piston upper chamber is a well head natural gas high pressure; and the piston cavity of resorption is the low pressure that is connected with atmosphere; piston will move downward drive piston rod and bottom to close spool 35 descending, closed the passage 34 of output natural gas, reached the purpose of safeguard protection.In like manner, low pressure sensor is lower than setting value at pressure, and low pressure sensor is opened and big gas phase channel, the course of action of each parts and above-mentioned be identical.Supposition now, because pressure sensor long-term operation of the present utility model, and in mordant gas medium blocked portion takes place and cisco unity malfunction, the flow control valve in the utility model will provide another kind of safety guarantee.The malfunctioning situation of high pressure sensor is at first described, at this moment the pressure of well head natural gas has surpassed setting value, in the input safety shutdown device is high-pressure natural gas, and the natural gas in the low-pressure line of output is a low pressure, and the pressure differential of the two is greatly about about 5～6 times.For example the gas pressure of gas production wellhead is 30MPa, and low pressure external transport pipeline pressure is about 6MPa.Because high-pressure natural gas flows to low-pressure end and flows, so the output quantity of natural gas is hurried increase, forms pressure reduction closing spool 37 places that enter the mouth, and closes thereby will close spool, and shutoff device cuts out.Accidental damage appears in the external transport pipeline as natural gas, and low pressure sensor is malfunctioning, and is identical with foregoing description; suddenly the natural gas flow of Zeng Daing is behind flow control valve; cause shut off valve to produce pressure reduction up and down and self-closing valve core 35, thereby close gas source, to reach the purpose of safeguard protection.
The utility model is after finishing once safety and closing the protection of source of the gas; to drop into ordinary production once more; at first the lower sealing cover with low pressure sensor compresses by handwheel; open the stop valve 6 that resets of differential pressure control valve then; unclamp the low pressure sensor lower sealing cover; it is identical with the reading of pressure meter 23 to observe pressure meter 11, can return to normal production.
Claims (9)
1, a kind of gas production wellhead safety shutdown device by pressure and flow-control includes differential pressure control valve, high pressure sensor, low pressure sensor and shifter cylinder, it is characterized in that:
It also comprises a flow control valve, and this flow control valve body is located in the path of gas wellhead equipment after reducing pressure and between the external transport pipeline, in the flow-control valve body flow-control is installed and closes spool;
Described shifter cylinder places the top of flow-control valve body, has the piston and the piston rod of a hollow, and the mesopore of piston and piston rod communicates with well head institute gas production; Above-mentioned flow control valve close the piston rod bottom that spool hangs over shifter cylinder;
The upper and lower chamber of described differential pressure control valve communicates with the upper and lower chamber of described shifter cylinder piston respectively;
Described high pressure sensor and low pressure sensor bottom gas port also communicates with the cavity of resorption of shifter cylinder piston, and the relief hole on two sensors then all communicates with atmosphere.
2, the gas production wellhead safety shutdown device by pressure and flow-control according to claim 1, it is characterized in that: be provided with the differential pressure control valve core in the described differential pressure control valve body, cavity of resorption at spool is equipped with back-moving spring, and the upper port of differential pressure control valve is connected with the stop valve that resets.
3, the gas production wellhead safety shutdown device by pressure and flow-control according to claim 2 is characterized in that: sealing ring is equipped with on the differential pressure control valve core top that is provided with in the described differential pressure control valve body, in the lower end of differential pressure control valve pressure meter is installed.
4, the gas production wellhead safety shutdown device by pressure and flow-control according to claim 1, it is characterized in that: on the pressure chamber lower body of described high pressure sensor the lower seal boss is arranged, and offer the passage that communicates with the shifter cylinder cavity of resorption simultaneously, one sealing cage is on boss, one sensor spring is pressed on seal cover top, also offers the relief hole that communicates with atmosphere.
5, the gas production wellhead safety shutdown device by pressure and flow-control according to claim 1, it is characterized in that: oriented lower seal boss on the body of described low pressure sensor middle part, lower sealing cover is against the seal boss below, the low pressure sensor spring is installed in the inner chamber of seal boss, be pressed on the lower sealing cover by adjusting rod, the passage that communicates with the closure piston cavity of resorption is offered in the bottom of pressure chamber, offers the relief hole that communicates with atmosphere simultaneously.
6, the gas production wellhead safety shutdown device by pressure and flow-control according to claim 1, it is characterized in that: the piston that the band piston rod is installed in the described shifter cylinder, piston rod and piston are a body component of hollow, the top of mesopore passes to piston upper chamber, the gas phase of the bottom of mesopore and well head input is logical, piston upper chamber is offered and is used for the passage that is communicated with the differential pressure pickup epicoele, and the piston cavity of resorption is offered and is used for passage that is communicated with the differential pressure pickup cavity of resorption and the passage that is communicated with the differential pressure control valve cavity of resorption.
7, the gas production wellhead safety shutdown device by pressure and flow-control according to claim 6, it is characterized in that: on the piston of described shifter cylinder sealing device is arranged, piston rod has sealing ring outward.
8, the gas production wellhead safety shutdown device by pressure and flow-control according to claim 1, it is characterized in that: the flow-control of being equipped with in the described flow-control valve body is equipped with the duplex sealing ring on closing spool, and the shut off valve core print seat is on a precompressed back-moving spring.
9, the gas production wellhead safety shutdown device by pressure and flow-control according to claim 1, the concrete syndeton that spool hangs over the piston rod bottom of shifter cylinder of closing that it is characterized in that described flow control valve is: offer circular groove at the shifter cylinder piston-rod lower end, two half snap rings are housed in the circular groove, will close spool with flag nut and be suspended on two half snap rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200801476U CN201176863Y (en) | 2008-04-23 | 2008-04-23 | Pressure and flow controlled gas recovery well head safety closing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200801476U CN201176863Y (en) | 2008-04-23 | 2008-04-23 | Pressure and flow controlled gas recovery well head safety closing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201176863Y true CN201176863Y (en) | 2009-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200801476U Expired - Fee Related CN201176863Y (en) | 2008-04-23 | 2008-04-23 | Pressure and flow controlled gas recovery well head safety closing device |
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| CN (1) | CN201176863Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103061707A (en) * | 2011-10-21 | 2013-04-24 | 中国石油天然气股份有限公司 | Cycling switch valve under well |
| CN104047567A (en) * | 2013-03-13 | 2014-09-17 | 中国石油天然气股份有限公司 | Automatic oil well exhaust valve, gas purifying device and method |
| CN106073259A (en) * | 2016-08-12 | 2016-11-09 | 西南大学 | Pneumatic type lifting chair safety pre-warning system and chair lift |
| CN111042764A (en) * | 2019-12-09 | 2020-04-21 | 陕西航天泵阀科技集团有限公司 | Emergency breaking device for natural gas wellhead adjustment |
| CN113494268A (en) * | 2020-04-08 | 2021-10-12 | 中国石油天然气股份有限公司 | Protection control device and method under condition of increasing instantaneous gas flow |
-
2008
- 2008-04-23 CN CNU2008200801476U patent/CN201176863Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103061707A (en) * | 2011-10-21 | 2013-04-24 | 中国石油天然气股份有限公司 | Cycling switch valve under well |
| CN103061707B (en) * | 2011-10-21 | 2015-07-22 | 中国石油天然气股份有限公司 | Cycling switch valve under well |
| CN104047567A (en) * | 2013-03-13 | 2014-09-17 | 中国石油天然气股份有限公司 | Automatic oil well exhaust valve, gas purifying device and method |
| CN106073259A (en) * | 2016-08-12 | 2016-11-09 | 西南大学 | Pneumatic type lifting chair safety pre-warning system and chair lift |
| CN106073259B (en) * | 2016-08-12 | 2023-02-17 | 西南大学 | Pneumatic lifting chair safety early warning system and lifting chair |
| CN111042764A (en) * | 2019-12-09 | 2020-04-21 | 陕西航天泵阀科技集团有限公司 | Emergency breaking device for natural gas wellhead adjustment |
| CN111042764B (en) * | 2019-12-09 | 2021-10-01 | 陕西航天泵阀科技集团有限公司 | Emergency breaking device for natural gas wellhead adjustment |
| CN113494268A (en) * | 2020-04-08 | 2021-10-12 | 中国石油天然气股份有限公司 | Protection control device and method under condition of increasing instantaneous gas flow |
| CN113494268B (en) * | 2020-04-08 | 2023-04-25 | 中国石油天然气股份有限公司 | Protection control device and method under condition of increasing instantaneous flow of gas |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090107 Termination date: 20110423 |