CN109083617A - Underground end hydraulic selector - Google Patents
Underground end hydraulic selector Download PDFInfo
- Publication number
- CN109083617A CN109083617A CN201711278283.6A CN201711278283A CN109083617A CN 109083617 A CN109083617 A CN 109083617A CN 201711278283 A CN201711278283 A CN 201711278283A CN 109083617 A CN109083617 A CN 109083617A
- Authority
- CN
- China
- Prior art keywords
- push rod
- casing
- sliding sleeve
- ball seat
- hydraulic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims 1
- 239000003129 oil well Substances 0.000 abstract description 12
- 238000012360 testing method Methods 0.000 abstract description 12
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000003208 petroleum Substances 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/04—Ball valves
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/06—Sleeve valves
Abstract
The invention discloses a kind of underground end hydraulic selectors, purpose is to solve under the conditions of the prior art of field of petroleum exploitation, it is limited by the horizontal segment of horizontal well or the deep-well section condition of high angle hole, switch control can not be carried out to down-hole pipe tag end test device, the problem of test oil bottom situation.The device includes shell, ball seat hydraulic sliding sleeve sub-assembly, connecting plate, push rod, switching mechanism, and switching mechanism includes spool, spool control spring, casing.In view of the drawbacks of the prior art, the present invention utilizes existing underground hydraulic pressure control technology, does not change existing oil well operation specification, provides a kind of completely new novel (expansion) hydraulic selector in underground.The present invention can realize under unregulated power drive environment and switch progress on-off control to down-hole oil tube tag end test device, and not influence the normal operation of oil well.Present inventive concept is ingenious, and design is the completely new exploration to shaft bottom hydraulic selector structure rationally, and the detection for oil well has remarkable progress.
Description
Technical field
The present invention relates to field of petroleum exploitation, the switching control techniques in down-hole oil tube tag end test device are applied.
Background technique
Logger and connecting cable are sent to shaft bottom, needle by the deep-well section of horizontal segment or high angle hole for horizontal well
Oil well bottom situation is tested, is always the problem in industry.
In the prior art, it there is no the control hydraulic selector for down-hole pipe end equipment, it is no existing with reference to technology, knot
Structure and application.For this purpose, the present invention provides a kind of completely new end hydraulic selector, belong to the new opplication of underground control technology and new
Structure, with good application prospect.
Summary of the invention
Goal of the invention of the invention is: under the conditions of the prior art of field of petroleum exploitation, by the horizontal segment of horizontal well
Or the limitation of the deep-well section condition of high angle hole, switch control can not be carried out to down-hole pipe tag end test device, test oil well
Bottom situation, for this purpose, the present invention provides a kind of underground end hydraulic selector.In view of the drawbacks of the prior art, the present invention is using now
Some underground hydraulic pressure control technologies do not change existing oil well operation specification, and it is hydraulic to provide a kind of completely new underground novel (expansion)
Switch.The present invention can be under unregulated power drive environment, and realization switchs down-hole oil tube tag end test device and carries out on-off control,
And do not influence the normal operation of oil well.Present inventive concept is ingenious, and design is the completely new spy to shaft bottom hydraulic selector structure rationally
Rope, the detection for oil well have remarkable progress.
To achieve the goals above, the present invention adopts the following technical scheme:
Underground end hydraulic selector, including shell, ball seat hydraulic sliding sleeve sub-assembly, push rod, switching mechanism, switching mechanism includes valve
Core, the spool matched with spool control spring, casing, and casing is arranged on push rod；
Ball seat hydraulic sliding sleeve sub-assembly be arranged in one end of shell and ball seat hydraulic sliding sleeve sub-assembly can opposite shell limit away from
From moving in S, ball seat hydraulic sliding sleeve sub-assembly is connected with push rod and push rod can pass ball seat hydraulic sliding sleeve sub-assembly distance S
Pass casing；
Shell is made of inner and outer tubes, and runner is equipped between inner tube and outer tube, and switching mechanism is arranged in the both ends of runner and opens
Switch control can be carried out to runner by closing mechanism, be seal chamber between switching mechanism in runner, it is mobile that the push rod can trigger casing
Distance S keeps spool mobile to case inside and opens runner connection inner tube, outer tube.
The sphere is steel ball.
The inner walls are provided with the position limiting structure for being limited to ball seat hydraulic sliding sleeve sub-assembly.
The push rod includes one section of push rod, two sections of push rod, and ball seat hydraulic sliding sleeve sub-assembly passes through connecting plate and one section of push rod
It is connected with first casing and ball seat hydraulic sliding sleeve sub-assembly is by connecting plate and one section of push rod that first casing can be pushed mobile,
First casing is connected by two sections of push rod with second casing and first casing passes through two sections of push rod and can push second set
Pipe and first sleeve synchronizing moving.
Ball seat hydraulic sliding sleeve sub-assembly includes hydraulic sliding sleeve, the sphere being arranged in hydraulic sliding sleeve, sphere reset spring, institute
It states and is provided with counterbore in hydraulic sliding sleeve and sphere can be pressed in counterbore bottom hole by sphere reset spring.
It further include connecting plate, the two sides of connecting plate are connected with ball seat hydraulic sliding sleeve sub-assembly, push rod respectively, in the shell
Side is provided with the hole with connecting plate cooperation.
The pressure control spring matched with connecting plate is provided in the hole.
The push rod, switching mechanism constitute switch main body, and the switch main body both ends are respectively arranged with pressure control spring
And pressure control spring can balance the thrust of ball seat hydraulic sliding sleeve sub-assembly transmitting.
For foregoing problems, the present invention provides a kind of underground end hydraulic selector.The present invention is a kind of only inside and outside in underground
Under the premise of providing pressure between tube wall, and in very limited space (between oil pipe inside and outside wall), oil pipe tag end test dress is opened
Set flow channel switch.
The course of work of the device is as follows: in the case of the device is in normal operation (i.e. the oil pumping operation on well), such as
Shown in Fig. 1, for spool under the action of casing, pressure control spring, the flow channel switch for connecting seal chamber with oil pipe is in "Off"
State；As shown in Fig. 2, when applying a control pressure P on wellControl, under the effect of the pressure, prevention fluid passes through oil pipe to sphere,
Make action of hydraulic force in hydraulic sliding sleeve, causes hydraulic sliding sleeve mobile to shaft bottom direction by force, to push push rod and casing to well
Bottom direction is mobile, and spool is finally made to lose the support of casing, and spool is under the action of spool controls spring, to oily in-pipe,
Seal chamber runner, and the reset movement of spool automatic locking casing are opened, to guarantee that runner continues opening state, completes switch
The control function of " opening ".
In the present invention, pressure control spring can be balanced as caused by control pressure and underground work random perturbation pressure
Malfunction, i.e. guarantee precise control.In the present invention, when not applying operating pressure, switch is in normally off；It is pre- when applying
If after operating pressure, switching accurate open；After removing operating pressure, continue to maintain a normally open state.Structure-based improvement, this hair
It is bright to close or open, the normal operation of oil well is not influenced.
Structure-based design, the present invention efficiently solve the problems, such as follows: 1) in down-hole pipe end (under ball seat
Test device just) carries out switch control；2) it overcomes switch in the prior art and the state of half-open semi-closure occurs；3) it overcomes existing
During having each spool in technology gradually to act opening with the increase of pressure, pressure switch wider range causes each spool
It cannot be guaranteed that the synchronous defect opened；4) present invention controls spring using spool and spool, while opening seal chamber runner,
The reset of locking casing, the reliable state for guaranteeing switch and remaining on, control switch more compact structure is reasonable, eliminates special
Locking system.
In the present invention, pressure P is controlled when applying one on wellControlWhen, ball seat stress makes sliding sleeve move downward S, and push rod pushes set
Pipe also moves S, and spool is caused to act under the action of spool controls spring, opens sealed passage.The present invention will commonly use hydraulic list
It is combined together to valve and hydraulic sliding sleeve are ingenious, that is, the device for meeting front end can obtain hydraulic enough, and can utilize hydraulic cunning
Set will drive along the power of oil pipe axis direction with the control switch for being transferred to oil pipe tag end test device, completion underground unregulated power is moved
Switch control under dynamic control, high temperature and pressure, complicated geological environment.The present invention can be in the horizontal segment or High angle of oil well horizontal well
The deep-well section of well, in the environment of unregulated power driving, realization is controllable to the switch of oil pipe tag end test device, so that downhole data is adopted
Collect more acurrate, reliable.Meanwhile the device is the down-hole switch of Remote Hydraulic control, is connect with oil pipe, is conveyed by oil pipe,
It can be used in straight well, horizontal well, application value with higher.In addition, structure-based improvement, underground hydraulic pressure plunger switch with
Pilot process is not present in self-lock protection structure integrated design, switch motion, is phase step type, self-locking after movement, and half-open shape is not present
State.
Further, structure-based improvement, the device of the invention push axial push rod by ball seat hydraulic sliding sleeve sub-assembly
Movement, can be arranged multiple switch on the operating path of push rod, and realization opens simultaneously, and respectively realize different control functions,
Meet corresponding testing requirement, realizes hydraulic plunger switch in other switch control application extensions of underground.
The present invention compensates for shaft bottom detection instrument application blank, can effectively improve oil well detection efficiency and effect, underground inspection
Measured data is more accurate, comprehensive.It is combined together in addition, the present invention will be produced with detection, realizes on-line checking, effectively promoted
The efficiency of oil well operation reduces operating cost.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is the schematic diagram when present invention is in close state.
Fig. 2 is the status diagram when present invention opens.
Fig. 3 is the fluid flow state schematic diagram after hydraulic selector of the invention is opened.
Marked in the figure: 1, shell, 2, sphere reset spring, 3, sphere, 4, sliding sleeve, 5, connecting plate, 6, push rod, 7, pressure control
Spring processed, 8, casing, 9, spool control spring, 10, spool, 11, runner.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.
Embodiment 1
The underground end hydraulic selector of the present embodiment includes shell, ball seat hydraulic sliding sleeve sub-assembly, connecting plate, push rod, opening/closing machine
Structure, switching mechanism include spool, the spool matched with spool control spring, casing, and casing is arranged on push rod.Ball seat is hydraulic
Sliding bush combination part includes hydraulic sliding sleeve, the sphere being arranged in hydraulic sliding sleeve, sphere reset spring, and it is heavy to be provided in hydraulic sliding sleeve
Hole and sphere can be pressed in counterbore bottom hole by sphere reset spring.The two sides of connecting plate respectively with ball seat hydraulic sliding sleeve sub-assembly, push away
Bar is connected, and case inside is provided with the hole with connecting plate cooperation；The pressure control spring with connecting plate phase separation is provided in hole.
In the present embodiment, one end of shell is arranged in ball seat hydraulic sliding sleeve sub-assembly, and ball seat hydraulic sliding sleeve sub-assembly passes through
Connecting plate is connected with push rod, and inner walls are then provided with the limit knot for being limited to ball seat hydraulic sliding sleeve sub-assembly
Structure.Shell is made of inner and outer tubes, and runner is equipped between inner tube and outer tube, and the both ends of runner are arranged in switching mechanism；Runner
It is seal chamber between interior switching mechanism.Push rod, switching mechanism constitute switch main body, and switch main body front end is provided with pressure control bullet
Spring, pressure control spring can balance the thrust of ball seat hydraulic sliding sleeve sub-assembly transmitting.In the present embodiment, steel ball is can be selected in sphere.
In the structure, switching mechanism can carry out switch control to runner；Further, ball seat hydraulic sliding sleeve sub-assembly can be opposite
Shell moves in restriction distance S, and the distance S of ball seat hydraulic sliding sleeve sub-assembly can then be passed to casing, push rod energy by push rod
Triggering casing moving distance S keeps spool mobile to case inside and opens runner formation convection current.
Further, the push rod of the present embodiment includes one section of push rod, two sections of push rod, and ball seat hydraulic sliding sleeve sub-assembly passes through connection
Plate and one section of push rod are connected with first casing and ball seat hydraulic sliding sleeve sub-assembly by connecting plate and one section of push rod pushes first
A casing is mobile, and first casing is connected by two sections of push rod with second casing and first casing passes through two sections of push rod promotions
Second casing and first sleeve synchronizing moving.In the structure, two sections of push rod can be several, it can push rod is constituted N
Section (N is natural number, and >=1).
The course of work of the device is as follows: in the case of the device is in normal operation (i.e. the oil pumping operation on well), such as
Shown in Fig. 1, for spool under the action of casing, pressure control spring, the flow channel switch for connecting seal chamber with oil pipe is in "Off"
State；As shown in Fig. 2, when applying a control pressure P on wellControl, under the effect of the pressure, prevention fluid passes through oil pipe to sphere,
Make action of hydraulic force in hydraulic sliding sleeve, causes hydraulic sliding sleeve mobile to shaft bottom direction by force, to push push rod and casing to well
Bottom direction is mobile, and spool is finally made to lose the support of casing, and spool is under the action of spool controls spring, to oily in-pipe,
Seal chamber runner, and the reset movement of spool automatic locking casing are opened, to guarantee that runner continues opening state, completes switch
The control function of " opening ".Finally as shown in figure 3, in the state opened.
The invention is not limited to specific embodiments above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (9)
1. underground end hydraulic selector, which is characterized in that including shell, ball seat hydraulic sliding sleeve sub-assembly, push rod, switching mechanism,
Switching mechanism includes spool, the spool matched with spool control spring, casing, and casing is arranged on push rod；
Ball seat hydraulic sliding sleeve sub-assembly be arranged in one end of shell and ball seat hydraulic sliding sleeve sub-assembly can opposite shell limit away from
From moving in S, ball seat hydraulic sliding sleeve sub-assembly is connected with push rod and push rod can pass ball seat hydraulic sliding sleeve sub-assembly distance S
Pass casing；
Shell is made of inner and outer tubes, and runner is equipped between inner tube and outer tube, and switching mechanism is arranged in the both ends of runner and opens
Switch control can be carried out to runner by closing mechanism, be seal chamber between switching mechanism in runner, it is mobile that the push rod can trigger casing
Distance S keeps spool mobile to case inside and opens runner connection inner tube, outer tube.
2. underground end hydraulic selector according to claim 1, which is characterized in that the sphere is steel ball.
3. underground end hydraulic selector according to claim 1, which is characterized in that the inner walls are provided with for ball
The position limiting structure that seat hydraulic sliding sleeve sub-assembly is limited.
4. underground end hydraulic selector according to claim 1, which is characterized in that further include connecting plate, the two sides of connecting plate
It is connected respectively with ball seat hydraulic sliding sleeve sub-assembly, push rod, the case inside is provided with the hole with connecting plate cooperation.
5. underground end hydraulic selector according to claim 4, which is characterized in that be provided in the hole and match with connecting plate
The pressure control spring of conjunction.
6. any one of -5 underground end hydraulic selector according to claim 1, which is characterized in that the push rod, switching mechanism
Switch main body is constituted, the switch main body both ends are respectively arranged with pressure control spring and pressure control spring can balance ball seat liquid
Press the thrust of sliding bush combination part transmitting.
7. any one of -6 underground end hydraulic selector according to claim 1, which is characterized in that the push rod includes push rod one
Section, two sections of push rod, ball seat hydraulic sliding sleeve sub-assembly is connected by one section of push rod with first casing and ball seat hydraulic sliding sleeve combines
Part pushes first casing mobile by one section of push rod, and first casing is connected and first by two sections of push rod with second casing
A casing can push second casing and first sleeve synchronizing moving by two sections of push rod.
8. underground end hydraulic selector according to claim 4, which is characterized in that the push rod includes one section of push rod, push rod
Two sections, ball seat hydraulic sliding sleeve sub-assembly is connected by connecting plate, one section of push rod with first casing and ball seat hydraulic sliding sleeve combines
Part can push first casing mobile by connecting plate and one section of push rod, and first casing passes through two sections of push rod and second casing
It is connected and first casing can pushes second casing and first sleeve synchronizing moving by two sections of push rod.
9. any one of -8 underground end hydraulic selector according to claim 1, which is characterized in that ball seat hydraulic sliding sleeve sub-assembly
Including hydraulic sliding sleeve, the sphere being arranged in hydraulic sliding sleeve, sphere reset spring, counterbore and ball are provided in the hydraulic sliding sleeve
Sphere can be pressed in counterbore bottom hole by body reset spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711278283.6A CN109083617A (en) | 2017-12-06 | 2017-12-06 | Underground end hydraulic selector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711278283.6A CN109083617A (en) | 2017-12-06 | 2017-12-06 | Underground end hydraulic selector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109083617A true CN109083617A (en) | 2018-12-25 |
Family
ID=64839560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711278283.6A Pending CN109083617A (en) | 2017-12-06 | 2017-12-06 | Underground end hydraulic selector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109083617A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973083A (en) * | 2019-04-18 | 2019-07-05 | 东营市宇彤机电设备有限责任公司 | A kind of cable type electro magnetic wave logger transmitting probe |
| CN113027380A (en) * | 2021-02-08 | 2021-06-25 | 中国石油大学(华东) | Fully-electrically-driven underground safety valve and redundancy control system thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3802992A1 (en) * | 1988-02-02 | 1989-08-10 | Gewerk Eisenhuette Westfalia | Spray valve device for dust suppression in underground spaces, in particular in underground operations with hydraulic support units |
| SU1678114A1 (en) * | 1988-12-08 | 1995-04-20 | Всесоюзный научно-исследовательский и проектно-конструкторский институт геофизических методов исследования, испытания и контроля нефтегазоразведочных скважин | Device for fluid circulation in well |
| RU2225502C1 (en) * | 2002-06-25 | 2004-03-10 | Грабовецкий Владимир Леонидович | Method for extracting gas and fluid from the well and sucker-rod well pump implementing said method |
| CN103806886A (en) * | 2012-11-06 | 2014-05-21 | 中国石油化工股份有限公司 | Underground steam sealing and controlling device and method of heavy oil thermal recovery well |
| CN104373108A (en) * | 2014-10-31 | 2015-02-25 | 绵阳固美科技有限公司 | Method and device for controlling on-off of underground detecting device |
| CN106703738A (en) * | 2017-02-24 | 2017-05-24 | 中国石油大学(北京) | Coiled tubing blowout preventing box |
| CN207513585U (en) * | 2017-12-06 | 2018-06-19 | 绵阳固美科技有限公司 | Underground end hydraulic selector |
-
2017
- 2017-12-06 CN CN201711278283.6A patent/CN109083617A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3802992A1 (en) * | 1988-02-02 | 1989-08-10 | Gewerk Eisenhuette Westfalia | Spray valve device for dust suppression in underground spaces, in particular in underground operations with hydraulic support units |
| SU1678114A1 (en) * | 1988-12-08 | 1995-04-20 | Всесоюзный научно-исследовательский и проектно-конструкторский институт геофизических методов исследования, испытания и контроля нефтегазоразведочных скважин | Device for fluid circulation in well |
| RU2225502C1 (en) * | 2002-06-25 | 2004-03-10 | Грабовецкий Владимир Леонидович | Method for extracting gas and fluid from the well and sucker-rod well pump implementing said method |
| CN103806886A (en) * | 2012-11-06 | 2014-05-21 | 中国石油化工股份有限公司 | Underground steam sealing and controlling device and method of heavy oil thermal recovery well |
| CN104373108A (en) * | 2014-10-31 | 2015-02-25 | 绵阳固美科技有限公司 | Method and device for controlling on-off of underground detecting device |
| CN106703738A (en) * | 2017-02-24 | 2017-05-24 | 中国石油大学(北京) | Coiled tubing blowout preventing box |
| CN207513585U (en) * | 2017-12-06 | 2018-06-19 | 绵阳固美科技有限公司 | Underground end hydraulic selector |
Non-Patent Citations (1)
| Title |
|---|
| 张国锋, 胡中亚: "新型地层测试井下关井阀的开发应用", 石油机械, no. 01 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973083A (en) * | 2019-04-18 | 2019-07-05 | 东营市宇彤机电设备有限责任公司 | A kind of cable type electro magnetic wave logger transmitting probe |
| CN113027380A (en) * | 2021-02-08 | 2021-06-25 | 中国石油大学(华东) | Fully-electrically-driven underground safety valve and redundancy control system thereof |
| CN113027380B (en) * | 2021-02-08 | 2022-07-29 | 中国石油大学(华东) | Fully-electrically-driven underground safety valve and redundancy control system thereof |
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