CN106285561A - Downhole safety valve system - Google Patents
Downhole safety valve system Download PDFInfo
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- CN106285561A CN106285561A CN201510249951.7A CN201510249951A CN106285561A CN 106285561 A CN106285561 A CN 106285561A CN 201510249951 A CN201510249951 A CN 201510249951A CN 106285561 A CN106285561 A CN 106285561A
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- hydraulic oil
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- safety valve
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Abstract
The embodiment of the present invention provides a kind of downhole safety valve system, and this downhole safety valve system includes: hydraulic oil container, is used for holding hydraulic oil；The inlet of hydraulic oil pressurizer and hydraulic oil container are by the first pipeline connection, and the liquid outlet of hydraulic oil pressurizer and storm valve are by the second pipeline connection；Hydraulic oil pressurizer is for when storm valve opened by needs, to the hydraulic oil supercharging in the second pipeline；One end of drain line and the second pipeline connection, the other end is used for discharging hydraulic oil；Linkage valve, is arranged on drain line, closes when hydraulic oil pressurizer is to the hydraulic oil supercharging in the second pipeline, opens during hydraulic oil blood pressure lowering in the second pipeline.The downhole safety valve system that the present invention provides, transforms by storm valve is controlled loop, eliminates the potential safety hazard that sealing inefficacy brings, it is to avoid workover treatment, has saved and carried out high expense produced by workover treatment because of storm valve seal failure.
Description
Technical field
The present embodiments relate to oil, natural gas extraction technical field, particularly relate to a kind of downhole safety
Valve system.
Background technology
Storm valve is a kind of safety equipment providing downhole closing, can be in an emergency at well head
The long-range downhole closing of Shi Shixian, thus the safety in production for high-pressure oil-gas well provides powerful guarantee.Down-hole
Safety valve system is made up of storm valve, control pipeline and ground control system.Domestic high-pressure gas well
Conventional storm valve belongs to flapper-type relief valve, is used at below ground closing well, is a kind of normally closed
Valve, this kind of storm valve connects with well wellbore, hydraulic control pressure open, in hydraulic control
Line pressure remains on before closing always, and hydraulic control pressure is by controlling pipeline from one relatively
Remote place transmission this valve of pressure operation.In general, storm valve includes: valve body, flap,
Spring, flow duct, piston and hydraulic control lines entrance, wherein, flow duct is connected with piston, bullet
Spring is arranged in flow duct, and hydraulic control lines is connected with closed tank, and flow duct is positioned at relief valve
Portion.During work, hydraulic control lines pressurization back piston promotes flow duct to move, and pushes flap open, opens
Relief valve；After controlling pipeline pressure release, the elastic force release of spring makes to move in flow duct, closed safe valve.
Storm valve is in use it is possible that the situation of piston seal performance inefficacy, and occurring should
After situation, the natural gas in well wellbore enters hydraulic control lines, and is let out by hydraulic control lines
Reveal or be ejected into closed tank.When the pressure of the natural gas in closed tank reaches to a certain degree, to be more than
During the tolerance of closed tank, cause fuel tank explosion, then cause closed tank to catch fire, to high pressure gas
The safety in production of well brings great hidden danger.The hidden danger brought for eliminating piston seal performance to lose efficacy, existing
In technology, owing to storm valve subterranean depth is generally 40～80 meters, therefore, at oil, natural
In the recovery process of gas, the inefficacy of this emergency valve piston sealing can only be eliminated by implementing workover treatment
The hidden danger brought.
But, owing to storm valve subterranean depth is generally 40～80 meters, cause high-pressure gas well well workover
Operating cost is high, time length, risk high.Therefore, a kind of downhole safety valve system of how deducting a percentage is real
For industry problem demanding prompt solution.
Summary of the invention
The present invention provides a kind of downhole safety valve system, transforms by storm valve is controlled loop
To realize eliminating the hidden danger of high-pressure gas well safety in production and avoiding workover treatment.
First aspect, the present invention provides a kind of downhole safety valve system, including: hydraulic oil container (1),
Hydraulic oil pressurizer (2), storm valve (3), linkage valve (4), the first pipeline (51),
Second pipeline (52), drain line (53), wherein,
Described hydraulic oil container (1), is used for holding hydraulic oil；
The inlet of described hydraulic oil pressurizer (2) and described hydraulic oil container (1) are by described the
One pipeline (51) connects, the liquid outlet of described hydraulic oil pressurizer (2) and described storm valve (3)
Connected by described second pipeline (52)；Described hydraulic oil pressurizer (2) is for opening institute at needs
When stating storm valve (3), to the hydraulic oil supercharging in described second pipeline (52)；
One end of described drain line (53) connects with described second pipeline (52), and the other end is used for arranging
Go out hydraulic oil；
Described linkage valve (4), is arranged on described drain line (53), in described hydraulic oil supercharging
Device (2) is closed during hydraulic oil supercharging in described second pipeline (52), described second pipeline (52)
In hydraulic oil blood pressure lowering time open.
In the first possible implementation of first aspect, described downhole safety valve system also includes:
Hydraulic control machine room (6), described hydraulic oil container (1), described hydraulic oil pressurizer (2) and described
It is internal that movable valve (4) is positioned at described hydraulic control machine room (6), and described drain line (53) is used for discharging liquid
It is outside that one end of force feed is positioned at described hydraulic control machine room (6).
In conjunction with the first possible implementation of first aspect, the second at first aspect may
Implementation in, described safety valve system also includes:
Open type fuel reserve tank (54), is arranged on the outside of described hydraulic control machine room (6), and with described oil extraction
Pipeline (53) is for discharging one end connection of hydraulic oil.
In conjunction with the first possible implementation of first aspect, in the third possibility of first aspect
Implementation in, described safety valve system also includes: safety valve pressure table (7), described relief valve pressure
Power table (7) is arranged on described second pipeline (52).
In conjunction with the first possible implementation of first aspect, in the 4th kind of possibility of first aspect
Implementation in, described safety valve system also includes:
High-pressure overflow valve (8), one end of described high-pressure overflow valve (8) is arranged on described second pipeline (52)
On, the other end is arranged on the outside of described hydraulic control machine room (6).
In conjunction with the first possible implementation of first aspect, in the 5th kind of possibility of first aspect
Implementation in, described safety valve system also includes:
Accumulator (9), described accumulator (9) is arranged on described second pipeline (52).
In conjunction with first aspect, in the 6th kind of possible implementation of first aspect, described safety
Valve system also includes: safety valve pressure table (7), high-pressure overflow valve (8) or accumulator (9), described
Safety valve pressure table (7), described high-pressure overflow valve (8) or described accumulator (9) are arranged on described
On two pipelines (52).
In conjunction with the 6th kind of possible implementation of first aspect, in the 7th kind of possibility of first aspect
Implementation in, described accumulator (9), described safety valve pressure table (7) and described high pressure kicks
Valve (8) is arranged on described second pipeline (52) the most in order.
In conjunction with first aspect, first aspect the first to any one possible realization side in the 7th kind
Formula, in the 8th kind of possible implementation of first aspect, described hydraulic oil pressurizer (2) is
Manual pump or electrodynamic pump.
In conjunction with first aspect, first aspect the first to any one possible realization side in the 7th kind
Formula, in the 9th kind of possible implementation of first aspect, described storm valve (3) is SP
Type relief valve or NE type relief valve.
The downhole safety valve system that the present invention provides, transforms by storm valve is controlled loop,
Avoid workover treatment, saved and carried out height produced by workover treatment because of storm valve seal failure
High expense, and avoid because the reservoir secondary pollution that causes of workover treatment and operation process are likely to occur
Other down hole problem, eliminate high-pressure gas well because storm valve piston seal performance lost efficacy and brought
The hidden danger of safety in production, be effectively ensured high pressure high gas rate well production time efficiency and condensate yield work as
Year contribution rate.
Accompanying drawing explanation
The structural representation of the downhole safety valve system that Fig. 1 provides for the present invention；
The structural representation of another the downhole safety valve system that Fig. 2 provides for the present invention；
The structural representation of another downhole safety valve system that Fig. 3 provides for the present invention；
The structural representation of another downhole safety valve system that Fig. 4 provides for the present invention；
The structural representation of another downhole safety valve system that Fig. 5 provides for the present invention.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with this
Accompanying drawing in bright embodiment, is clearly and completely described the technical scheme in the embodiment of the present invention,
Obviously, described embodiment is a part of embodiment of the present invention rather than whole embodiments.Based on
Embodiment in the present invention, those of ordinary skill in the art are obtained under not making creative work premise
The every other embodiment obtained, broadly falls into the scope of protection of the invention.
The structural representation of the downhole safety valve system that Fig. 1 provides for the present invention.As it is shown in figure 1,
The present embodiment provide downhole safety valve system 100 include: hydraulic oil container 1, hydraulic oil pressurizer 2,
Storm valve 3, linkage valve the 4, first pipeline the 51, second pipeline 52, drain line 53.
Wherein, described hydraulic oil container 1, for sealing container, is used for holding hydraulic oil；Described hydraulic oil increases
The inlet of pressure device 2 is connected by described first pipeline 51 with described hydraulic oil container 1, described hydraulic pressure
The liquid outlet of oil pressurizer 2 is connected by described second pipeline 52 with described storm valve 3；Described
Hydraulic oil pressurizer 2 is for when described storm valve 3 opened by needs, to described second pipeline 52
Interior hydraulic oil supercharging；One end of described drain line 53 connects with described second pipeline 52, the other end
For discharging hydraulic oil；Described linkage valve 4, is arranged on described drain line 53, at described hydraulic pressure
Oil pressurizer 2 is closed during hydraulic oil supercharging in described second pipeline 52, at described second pipeline
Open during hydraulic oil blood pressure lowering in 52.
Below, the operation principle of the downhole safety valve system provided the embodiment of the present invention in conjunction with Fig. 1 is done in detail
Describe in detail bright.
Concrete, when storm valve 3 pressurization is opened by normal job demand, hydraulic oil pressurizer 2
To the hydraulic oil supercharging in the second pipeline 52, linkage valve 4 is closed simultaneously, and now, hydraulic oil is from hydraulic pressure
Oil vessel 1 is transferred to storm valve 3 by the first pipeline 51 and the second pipeline 52, thus to down-hole
Relief valve 3 pressurization is at the state opened.
When needing storm valve 3 pressure release is closed when being in an emergency etc., the liquid in the second pipeline 52
Force feed needs pressure release, and the linkage valve 4 being arranged on drain line 53 is opened so that hydraulic oil is by row
Oil pipe line 53 flows out, thus storm valve 3 pressure release is at closed mode.Now, if well
The piston seal performance of lower relief valve 3 lost efficacy, and the natural gas in well wellbore enters the second pipeline 52, due to
Linkage valve 4 is in open mode so that the hydraulic oil containing natural gas can be crossed by linkage valve 4
Discharge through drain line 53, thus avoid the liquid by storm valve 3 of the natural gas in well wellbore
Keyholed back plate line, the i.e. second pipeline 52 and the first pipeline 51 are revealed or are ejected into hydraulic oil container 1, eliminate
The hidden danger of the safety in production that high-pressure gas well brought because storm valve piston seal performance lost efficacy.
The downhole safety valve system that the embodiment of the present invention provides, is carried out by storm valve is controlled loop
Transformation, it is to avoid workover treatment, has saved and carries out workover treatment produced because of storm valve seal failure
Raw high expense, and avoid because can in the reservoir secondary pollution that causes of workover treatment and operation process
Other down hole problem that can occur, eliminates high-pressure gas well because of the inefficacy of storm valve piston seal performance
And the hidden danger of the safety in production brought, be effectively ensured high pressure high gas rate well production time efficiency and condensate
Yield contribution rate then.
Optionally, in an embodiment of the present invention, can be to the storm valve shown in above-mentioned Fig. 1 embodiment
System 100 is further improved, and specifically can be found in Fig. 2.
The structural representation of another the downhole safety valve system that Fig. 2 provides for the present invention.As in figure 2 it is shown,
The downhole safety valve system 200 that the present embodiment provides is at downhole safety valve system 100 shown in above-mentioned Fig. 1
On the basis of, also include: hydraulic control machine room 6, described hydraulic oil container 1, described hydraulic oil pressurizer 2 and
Described linkage valve 4 is positioned at inside described hydraulic control machine room, and described drain line 53 is for discharging hydraulic oil
It is outside that one end is positioned at described hydraulic control machine room 6.In the present embodiment, by hydraulic oil container 1, hydraulic oil supercharging
It is internal that device 2 and linkage valve 4 are arranged on hydraulic control machine room 6, is used for discharging hydraulic oil by drain line 53
One end be arranged on the outside of hydraulic control machine room 6, the hydraulic oil pollution liquid flowed out by drain line 53 can be avoided
Other equipment within control machine room 6 or hydraulic control machine room 6.
Optionally, in an embodiment of the present invention, can be to the storm valve shown in above-mentioned Fig. 2 embodiment
System 200 is further improved, and specifically can be found in Fig. 3.
The structural representation of another downhole safety valve system that Fig. 3 provides for the present invention.As it is shown on figure 3,
The downhole safety valve system 300 that the present embodiment provides is at downhole safety valve system 200 shown in above-mentioned Fig. 2
On the basis of, also include: open type fuel reserve tank 54, be arranged on the outside of hydraulic control machine room 6, and and oil exit pipe
Road 53 is for discharging one end connection of hydraulic oil.In the present embodiment, through the hydraulic pressure that drain line 53 flows out
Oil can be collected by open type fuel reserve tank 54, in order to hydraulic oil can be circulated utilization.And,
When the hydraulic oil flowed out via drain line 53 is mixed with natural gas, natural gas can be made to be stored up by open type
The opening of fuel tank 54 overflows.
Optionally, in an embodiment of the present invention, can be to the downhole safety valve system 200 shown in above-mentioned Fig. 2
Or the downhole safety valve system shown in Fig. 3 is further improved, specifically can be found in Fig. 4.
The structural representation of another downhole safety valve system that Fig. 4 provides for the present invention.As shown in Figure 4,
The downhole safety valve system 400 that the present embodiment provides is at downhole safety valve system 200 shown in above-mentioned Fig. 2
On the basis of, also including: safety valve pressure table 7, described safety valve pressure table 7 is arranged on described second pipe
On road 52.In the present embodiment, the safety valve pressure table 7 being arranged on the second pipeline 52 can show in real time
The pressure of hydraulic oil in second pipeline 52, the real-time of oil pressure is monitored by convenient realization.
Refer to Fig. 4 again, optionally, in an embodiment of the present invention, downhole safety valve system 400 is also
Including: high-pressure overflow valve 8, described high-pressure overflow valve 8 is arranged on described second pipeline 52.This enforcement
In example, one end of high-pressure overflow valve 8 is arranged on second pipe 52, and the other end is arranged on drain line
53 for discharging between one end of hydraulic oil and linkage valve 4 and be positioned at the outside of hydraulic control machine room (6).
When in the second pipeline 52, oil pressure is more than a certain threshold value, such as, safety valve pressure table 7 monitors out the second pipe
When in road 52, oil pressure is more than a certain threshold value, high-pressure overflow valve 8 is opened and is carried out overflow pressure relief, thus avoids pipe
Road explosion event.It addition, in the present embodiment, the other end of high-pressure overflow valve 8 is arranged on drain line 53
For being to reach also may be used when linkage valve 4 is closed between the one end discharging hydraulic oil and linkage valve 4
To carry out overflow pressure relief.
Refer to Fig. 4 again, optionally, in an embodiment of the present invention, downhole safety valve system 400 is also
Including: accumulator 9, described accumulator 9 is arranged on described second pipeline 52.In the present embodiment, when
When in second pipeline 52, oil pressure is less than a certain threshold value, such as, safety valve pressure table 7 monitors out the second pipeline
When in 52, oil pressure is less than a certain threshold value, the accumulator 9 being arranged on the second pipeline 52 starts compensating for second
Pressure in pipeline 52, thus play the effect of stabilisation systems pressure.
Refer to Fig. 4, optionally, in an embodiment of the present invention, described safety valve pressure table 7, institute again
State high-pressure overflow valve 8 to be arranged on the most in order on described second pipeline 52 with described accumulator 9.This reality
Execute in example, on the second pipeline 52 between connection hydraulic oil pressurizer 2 and storm valve 3, successively
Accumulator 9, safety valve pressure table 7 and high-pressure overflow valve 8 are set.
Although it should be noted that the various embodiments described above be based on Fig. 4 to safety valve pressure table 7,
What as a example by high-pressure overflow valve 8 and accumulator 9, the present invention is described in detail.But, the present invention is not
As restriction, in the embodiment that other are feasible, safety valve pressure table 7, high-pressure overflow valve 8 and
Accumulator 9 can also be based on safety valve system Fig. 1, Fig. 2 or Fig. 3 etc. Suo Shi.Such as, Fig. 5 institute
The safety valve system shown, the structural representation of another downhole safety valve system that Fig. 5 provides for the present invention,
Its specific works principle can be found in the description of above-mentioned Fig. 1～Fig. 4, and here is omitted.
Although it addition, also, it should be noted in above-mentioned embodiment illustrated in fig. 4, safety valve pressure table 7,
High-pressure overflow valve 8 and accumulator 9 are respectively provided with and the outside of hydraulic control machine room 6.But, the present invention not with
This is for limiting, and in the embodiment that other are feasible, can arrange safety valve pressure table 7, height according to demand
Pressurized overflow valve 8 and accumulator 9 all with the relative position of hydraulic control machine room 6.Such as, can be by full valve Pressure gauge
7, high-pressure overflow valve 8 and accumulator 9 are respectively provided with and the inside of hydraulic control machine room 6, or, by one of them
It is arranged on the inside of hydraulic control machine room 6, the remaining outside being arranged on hydraulic control machine room 6.
Although it addition, also, it should be noted in above-mentioned embodiment illustrated in fig. 4, downhole safety valve system
400 comprise safety valve pressure table 7, high-pressure overflow valve 8 and accumulator 9.But, the present invention is not with this
For limit, in the embodiment that other are feasible, safety valve system 400 can only comprise one of them or
Two wherein.
Optionally, in an embodiment of the present invention, hydraulic oil pressurizer 2 is manual pump or electrodynamic pump.
Optionally, in an embodiment of the present invention, storm valve 3 is SP type relief valve or NE type peace
Full valve.
Optionally, in an embodiment of the present invention, linkage valve 4 is electromagnetic valve.When hydraulic oil supercharging fills
Put 2 to hydraulic oil supercharging in the second pipeline 52 time, closed electromagnetic valve；That second pipeline 52 in
Hydraulic oil when needing blood pressure lowering, electromagnetic valve is opened.
Optionally, in an embodiment of the present invention, linkage valve 4 is pilot valve.Downhole safety valve system
The opening and closing of pilot valve is controlled by the hydraulic fluid pressure controlled in the second pipeline 52 by pilot valve.Example
As, when hydraulic oil pressurizer 2 is to the hydraulic oil supercharging in the second pipeline 52, pilot valve controls second
Hydraulic oil pressurization in pipeline 52, pilot valve is closed；When the hydraulic oil in the second pipeline 52 needs blood pressure lowering
Time, pilot valve controls the hydraulic oil pressure release in the second pipeline 52, and pilot valve is closed.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, rather than right
It limits；Although the present invention being described in detail with reference to foregoing embodiments, this area common
Skilled artisans appreciate that the technical scheme described in foregoing embodiments still can be modified by it,
Or the most some or all of technical characteristic is carried out equivalent；And these amendments or replacement, and
The essence not making appropriate technical solution departs from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a downhole safety valve system, it is characterised in that including:
Hydraulic oil container (1), hydraulic oil pressurizer (2), storm valve (3), linkage valve
(4), the first pipeline (51), the second pipeline (52), drain line (53), wherein,
Described hydraulic oil container (1), is used for holding hydraulic oil；
The inlet of described hydraulic oil pressurizer (2) and described hydraulic oil container (1) are by described the
One pipeline (51) connects, the liquid outlet of described hydraulic oil pressurizer (2) and described storm valve (3)
Connected by described second pipeline (52)；Described hydraulic oil pressurizer (2) is for opening institute at needs
When stating storm valve (3), to the hydraulic oil supercharging in described second pipeline (52)；
One end of described drain line (53) connects with described second pipeline (52), and the other end is used for arranging
Go out hydraulic oil；
Described linkage valve (4), is arranged on described drain line (53), in described hydraulic oil supercharging
Device (2) is closed during hydraulic oil supercharging in described second pipeline (52), described second pipeline (52)
In hydraulic oil blood pressure lowering time open.
Downhole safety valve system the most according to claim 1, it is characterised in that also include:
Hydraulic control machine room (6), described hydraulic oil container (1), described hydraulic oil pressurizer (2) and institute
Stating linkage valve (4) and be positioned at described hydraulic control machine room (6) inside, described drain line (53) is used for arranging
The one end going out hydraulic oil is positioned at described hydraulic control machine room (6) outside.
Downhole safety valve system the most according to claim 2, it is characterised in that also include:
Open type fuel reserve tank (54), is arranged on the outside of described hydraulic control machine room (6), and with described oil extraction
Pipeline (53) is for discharging one end connection of hydraulic oil.
Downhole safety valve system the most according to claim 2, it is characterised in that also include:
Safety valve pressure table (7), described safety valve pressure table (7) is arranged on described second pipeline (52)
On.
Downhole safety valve system the most according to claim 2, it is characterised in that also include:
High-pressure overflow valve (8), one end of described high-pressure overflow valve (8) is arranged on described second pipeline (52)
On, the other end is arranged on the outside of described hydraulic control machine room (6).
Safety valve system the most according to claim 2, it is characterised in that also include:
Accumulator (9), described accumulator (9) is arranged on described second pipeline (52).
Downhole safety valve system the most according to claim 1, it is characterised in that also include: safety
Valve Pressure gauge (7), high-pressure overflow valve (8) or accumulator (9), described safety valve pressure table (7),
Described high-pressure overflow valve (8) or described accumulator (9) are arranged on described second pipeline (52).
Downhole safety valve system the most according to claim 7, it is characterised in that described accumulator (9),
Described safety valve pressure table (7) and described high-pressure overflow valve (8) are arranged on described second the most in order
On pipeline (52).
9. according to the downhole safety valve system described in any one of claim 1～8, it is characterised in that described
Hydraulic oil pressurizer (2) is manual pump or electrodynamic pump.
10. according to the downhole safety valve system described in any one of claim 1～8, it is characterised in that institute
Stating storm valve (3) is SP type relief valve or NE type relief valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510249951.7A CN106285561B (en) | 2015-05-15 | 2015-05-15 | Downhole safety valve system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510249951.7A CN106285561B (en) | 2015-05-15 | 2015-05-15 | Downhole safety valve system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106285561A true CN106285561A (en) | 2017-01-04 |
| CN106285561B CN106285561B (en) | 2019-05-07 |
Family
ID=57632036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510249951.7A Active CN106285561B (en) | 2015-05-15 | 2015-05-15 | Downhole safety valve system |
Country Status (1)
| Country | Link |
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| CN (1) | CN106285561B (en) |
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| CN110593858A (en) * | 2019-09-20 | 2019-12-20 | 河北国创石油设备有限公司 | Force measuring device and system for simulating underground pressure |
| CN111219173A (en) * | 2018-11-26 | 2020-06-02 | 中国石油天然气股份有限公司 | Christmas tree control device and Christmas tree |
| CN111441744A (en) * | 2020-05-08 | 2020-07-24 | 中国石油天然气集团有限公司 | High-pressure energy-storage pressure-relief starting type pressure control valve and using method |
| CN112539043A (en) * | 2018-05-17 | 2021-03-23 | 罗运川 | Cleaning method and verification method for liquid inlet of piston of underground safety valve |
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| US20100276023A1 (en) * | 2009-04-29 | 2010-11-04 | Longyear Tm, Inc. | Valve system for drilling systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112539043A (en) * | 2018-05-17 | 2021-03-23 | 罗运川 | Cleaning method and verification method for liquid inlet of piston of underground safety valve |
| CN111219173A (en) * | 2018-11-26 | 2020-06-02 | 中国石油天然气股份有限公司 | Christmas tree control device and Christmas tree |
| CN111219173B (en) * | 2018-11-26 | 2022-03-29 | 中国石油天然气股份有限公司 | Christmas tree control device and Christmas tree |
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| CN111441744A (en) * | 2020-05-08 | 2020-07-24 | 中国石油天然气集团有限公司 | High-pressure energy-storage pressure-relief starting type pressure control valve and using method |
| CN111441744B (en) * | 2020-05-08 | 2023-11-14 | 中国石油天然气集团有限公司 | High-pressure energy storage and pressure release start type pressure control valve and use method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106285561B (en) | 2019-05-07 |
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