CN106246137A - A kind of magnetic force storm valve - Google Patents
A kind of magnetic force storm valve Download PDFInfo
- Publication number
- CN106246137A CN106246137A CN201610626036.XA CN201610626036A CN106246137A CN 106246137 A CN106246137 A CN 106246137A CN 201610626036 A CN201610626036 A CN 201610626036A CN 106246137 A CN106246137 A CN 106246137A
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- Prior art keywords
- valve
- mandrel
- shell
- magnetic force
- magnet
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Links
- 230000007246 mechanism Effects 0.000 claims abstract description 5
- 238000007667 floating Methods 0.000 claims abstract description 4
- 230000007704 transition Effects 0.000 claims description 22
- 210000002445 nipple Anatomy 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004899 motility Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- 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
- E21B34/06—Valve arrangements for boreholes or wells in wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0021—Safety devices, e.g. for preventing small objects from falling into the borehole
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Safety Valves (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Disclosing a kind of magnetic force storm valve herein, including mandrel, the first shell and the valve seat being sleeved on the first shell bottom, the ring-shaped cavity between mandrel and the first shell is provided with magnetic and floats assembly；The top of ring-shaped cavity is set to the mobile terminal that the end with plunger assembly is connected, and bottom is set to the fixing end being connected with the first shell；Magnetic floating mechanism includes that two Magnet that homopolarity is oppositely arranged, two Magnet are separately positioned on mobile terminal and fixing end；Mandrel is set to fixing connection plunger assembly, and the top of plunger assembly is provided with pressurizing port, and the bottom of mandrel is provided with the valve plate being connected with valve seat bottom torsion spring；The present invention relates to, but not limited to downhole safety instrument, the application present invention can effectively overcome defect present in prior art, it is capable of the Advantageous Effects such as stable unlatching and quick closedown valve plate, it is possible to effectively shorten the length of solid tool, and effectively reduce manufacturing cost.
Description
Technical field
The application relates to, but are not limited to downhole safety instrument, especially a kind of magnetic force storm valve.
Background technology
Storm valve is attached on oil pipe, and with a kind of security control instrument of tubing string G.I.H；This instrument
Being connected with ground control unit by liquid controling pipe line, when beating hydraulic pressure to certain numerical value from ground, storm valve is in be opened
State；When there are the emergencies such as blowout, fire, tsunami, the pressure of liquid controling pipe line can manually or automatically be laid down, and down-hole is pacified
Full valve cuts out, to close the down-hole pressure of below relief valve, it is to avoid gas blowout accident occur.The flowing well at sea, electric pump well at present
Storm valve it is assembled with according to the rules with the high-pressure gas well on land.
In prior art, storm valve ultimate principle is that ground hydraulic controls downhole valve switching plate, mainly includes down-hole
Hydraulic plunger system, elastic pass closed system, valve plate sealing system and self-balancing system.The Chief mechanism of emergency shutdown system
Being elastic pass closed system, determine the reliability of whole system, the most elastic closed system that closes uses compression spring, spring wire footpath
Slightly, stroke length, compression stress big, cause that storm valve overall dimensions is longer, cost is high, in motor process, camber of spring causes work
Plug climbing reduces switch motility, which reduces valve plate stability in actual use.
Summary of the invention
The application solves the technical problem that and is to provide a kind of magnetic force storm valve, it is possible to effectively overcomes in prior art and deposits
Defect, it is possible to realize stable unlatching and the Advantageous Effects such as quick closedown valve plate, it is possible to effectively shorten solid tool
Length, and effectively reduce manufacturing cost.
For solving above-mentioned technical problem, this application provides a kind of magnetic force storm valve,
Including mandrel, the first shell and the valve seat being sleeved on the first shell bottom, between described mandrel and the first shell
Ring-shaped cavity magnetic be installed float assembly；The top of described ring-shaped cavity is set to the mobile terminal that the end with plunger assembly is connected,
Bottom is set to the fixing end being connected with the first shell；Described magnetic floating mechanism includes two Magnet that homopolarity is oppositely arranged, two magnetic
Ferrum is separately positioned on mobile terminal and fixing end；
Described mandrel is set to fixing connection plunger assembly, and the top of described plunger assembly is provided with pressurizing port, described mandrel
Bottom is provided with the valve plate being connected with valve seat bottom torsion spring；Described pressurizing port suppress operation, be set to drive plunger assembly drive
Mandrel, the Magnet of mobile terminal together move down and back down valve plate.
Above-mentioned magnetic force storm valve, also can have following features,
Also include top connection, transition joint, lower contact；It is set to be set in transition joint inside the bottom of described top connection
Outside top, the Basolateral of described transition joint is set to be set in the top inner side of the first shell, in described transition joint
Cavity body is set to be set with mandrel, and described lower contact is set to be set in the Basolateral of the first shell, and described valve seat is set to be set in
Inside the bottom of the first shell；Described top connection is provided with described pressurizing port, described transition joint be provided with described plunger assembly and
The through hole of mounting post plug assembly.
Above-mentioned magnetic force storm valve, also can have following features,
Described plunger assembly includes plunger, the seal nipple being located at plunger top, is located at the pressure cap of plunger bottom, Yi Jitao
It is contained in outside plunger and cooperatively forms the seal assembly of sealing with the through hole of transition joint.
Above-mentioned magnetic force storm valve, also can have following features,
The bottom of described pressure cap is provided with connecting rod, and described connecting rod is provided with the step surface promoting mandrel to move down, described mandrel
It is provided with the shoulder structure coordinating step surface action；The bottom of described connecting rod is provided with and pushes away cap, described in push away the bottom of cap and be set to promote
The end face that Magnet moves down, described in push away cap and be additionally provided with and promote the inclined-plane moved in shoulder structure.
Above-mentioned magnetic force storm valve, also can have following features,
Described valve plate is provided with tapered plug and installs the taper hole of tapered plug, described tapered plug and the flat spring phase being inserted in taper hole
Even.
Above-mentioned magnetic force storm valve, also can have following features,
Described first shell is set to Magnet set.
Above-mentioned magnetic force storm valve, also can have following features,
The top perisporium of described transition joint is provided with the external screw thread being connected with top connection, and bottom perisporium is provided with and Magnet
The external screw thread that set connects.
Above-mentioned magnetic force storm valve, also can have a following features, the bottom perisporium of described Magnet set be provided with under connect
The female thread that the external screw thread that head connects is connected with valve seat.
Above-mentioned magnetic force storm valve, also can have following features,
Described torsion spring is arranged on the bearing pin running through valve seat and valve plate, and one end of described torsion spring is set to connecting valve seat, described
The other end of torsion spring is set to connect valve plate.
The application technique scheme has the advantages that
The present invention floats assembly by the magnetic of optimal design-aside and other connect assembly, it is possible to realize stable unlatching and quick
Close the Advantageous Effects such as valve plate, it is possible to effectively shorten the length of solid tool, and effectively reduce manufacturing cost；Meanwhile, on
State the structure composition of optimal design-aside rationally, it is easy to promote and implement.
Other features and advantage will illustrate in the following description, and, partly become from description
Obtain it is clear that or understand by implementing the embodiment of the present invention.The purpose of the application and other advantages can be by explanations
Structure specifically noted in book, claims and accompanying drawing realizes and obtains.
Accompanying drawing explanation
Accompanying drawing is used for providing being further appreciated by technical scheme, and constitutes a part for description, with this
The embodiment of application for explaining the technical scheme of the application, is not intended that the restriction to technical scheme together.
Fig. 1 is that the overall structure of the embodiment of the present invention partly cuts open schematic diagram；
Fig. 2 is the enlarged diagram of the integrally-built superstructure of Fig. 1；
Fig. 3 is the enlarged diagram of the integrally-built substructure of Fig. 1；
Fig. 4 is the enlarged diagram of the integrally-built valve board structure of Fig. 1.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments herein is described in detail.It should be noted that do not conflicting
In the case of, the embodiment in the application and the feature in embodiment can mutual combination in any.
Shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4,
Embodiments provide a kind of magnetic force storm valve, including mandrel the 12, first shell and be sleeved on the
The valve seat 14 of one shell bottom, the ring-shaped cavity between mandrel 12 and the first shell is provided with magnetic and floats assembly；The top of ring-shaped cavity
End is set to the mobile terminal that the end with plunger assembly is connected, and bottom is set to the fixing end being connected with the first shell；Magnetic floating mechanism bag
Including two Magnet that homopolarity is oppositely arranged, two Magnet are separately positioned on mobile terminal and fixing end；Mandrel 12 is set to fixing connection
Plunger assembly, the top of plunger assembly is provided with pressurizing port K, and the bottom of mandrel 12 is provided with the valve being connected with valve seat 14 bottom torsion spring 19
Plate 18；Pressurizing port K suppresses operation, is set to drive plunger assembly band moving mandrel 12, the Magnet of mobile terminal together to move down
And back down valve plate 18.
Further, above-mentioned torsion spring 19 may be mounted on the bearing pin 15 running through valve seat 14 and valve plate 18, the one of torsion spring 19
End is set to connecting valve seat 14, and the other end of torsion spring 19 is set to connect valve plate 18；When valve plate 18 is pressed for 12 times by mandrel, will overcome
The elastic force of torsion spring 19 also rotates counterclockwise unlatching valve plate 18；When moving on mandrel 12, under the effect of torsion spring 19 moment of torsion, valve plate 18
Recovering initial position clockwise, and fit tightly with valve seat 14, storm valve is closed, and reaches to isolate the purpose of down-hole oil gas.
Preferably, valve plate 18 also can be provided with tapered plug 16 and install the taper hole of tapered plug 16, and tapered plug 16 can be by being inserted into cone
Flat spring 17 in hole is connected；In concrete operations, pressurizing port suppress operation, be specifically set to drive plunger assembly band moving mandrel
12, the Magnet of mobile terminal together moves down, and touches tapered plug 16 and then back down valve plate 14.
In concrete operations, float, by magnetic, two Magnet that the homopolarity set by assembly is oppositely arranged, using the teaching of the invention it is possible to provide stable
Repulsive force；And along with the Magnet 9 of movable end together moves down together with mandrel 12, the repulsion that the Magnet 10 the closer to fixing end is born
Power is the biggest.Meanwhile, moving down of mandrel 12, the valve plate 18 that bottom is arranged is backed down, to realize valve plate about 18 liquid medium
Connection；When valve plate 18 closed by needs, the pressurizing port providing power for plunger 3 can be carried out pressure discharge operations, now magnetic floats group
Repulsive force between part is as the power moved on plunger 3, and recovers rapidly to initial position；Meanwhile, anti-at torsion spring of valve plate 18
Recover to closed mode under moment of torsion effect.Compared to spring assembly of the prior art, magnetic of the present invention floats assembly tool
There is the feature that volume is little, longitudinal size is short, it is possible to effectively reduce the overall dimensions of storm valve.
Preferably, in order to optimize the application said structure composition；In concrete operations of the present invention, it is also possible to include top connection 1,
Transition joint 4, lower contact 13；It is set to inside the bottom of top connection 1 be set in outside the top of transition joint 4, transition joint 4
Basolateral is set to be set in the top inner side of the first shell, and the hollow cavity of transition joint 4 is set to be set with mandrel 12, lower contact
13 are set to be set in the Basolateral of the first shell, and valve seat 14 is set to be set in inside the bottom of the first shell；Top connection 1 is provided with
Pressurizing port, transition joint 4 is provided with plunger assembly and the through hole of mounting post plug assembly.
In concrete operations, above-mentioned first shell can be set to Magnet set 11；The top perisporium of transition joint 4 is provided with upper
The external screw thread that joint 1 connects, bottom perisporium is provided with the external screw thread being connected with Magnet set 11；By above-mentioned transition joint 4
Realize overlapping 11 threaded with top connection 1, Magnet.Accordingly, the bottom perisporium of Magnet set 11 is provided with lower contact 13 even
The female thread that the external screw thread connect is connected with valve seat 14；Can be realized and the threadeding of lower contact 13 by above-mentioned Magnet set 11.
Preferably, in order to optimize the structure composition of the above-mentioned plunger assembly of the application；In concrete operations of the present invention, plunger assembly
Plunger 3 can be included, be located at the seal nipple 2 on plunger 3 top, be located at the pressure cap 6 of plunger 3 bottom and be sleeved on outside plunger 3
Side and the seal assembly 5 sealed with the formation of transition joint through hole.In concrete operations, by above-mentioned seal nipple 2, seal assembly 5
Deng, it is possible to it is effectively improved the sealing stability in plunger 3 running.
Preferably, in order to optimize the above-mentioned pressure cap of the application 6 and connect the structure composition of assembly；Concrete operations of the present invention
In, the bottom of pressure cap 6 can be provided with connecting rod 7, and connecting rod 7 is provided with the step surface promoting mandrel 12 to move down, and mandrel 12 is provided with joins
Close the shoulder structure of step surface action；The bottom of connecting rod 7 is provided with and pushes away cap 8, and the bottom pushing away cap 8 is set to the end that promotion Magnet moves down
Face, pushes away cap 8 and is additionally provided with in promotion shoulder structure the inclined-plane moved.
In concrete operations, when pressurizing port carries out suppressing operation, under plunger 3 moves down and drives pressure cap 6, connecting rod 7 together
Move；Connecting rod 7 is moved down by step surface band moving mandrel 12, drives the Magnet 9 of movable end to move down by the cap 8 that pushes away of bottom.When beating
During pressure hole pressure discharge operations, the Magnet 9 of movable end is moved by repulsive force, and drive pushes away and moves on cap 8；Push away cap 8 to be promoted even by top
Move on extension bar 7, pressure cap 6, plunger 3, by moving in convex surface band moving mandrel 12.Alternatively, connecting rod 7 by linking up with and can push away cap
8 connect, and are connected with mandrel 12 by step；Above-mentioned connecting rod 7 and mandrel 12, the connection pushed away between cap 8 and mandrel 12 can be adopted
By multiple connected modes such as fixing connections, specifically to be capable of moving being as the criterion simultaneously.
The present invention floats assembly by the magnetic of optimal design-aside and other connect assembly, it is possible to realize stable unlatching and quick
Close the Advantageous Effects such as valve plate, it is possible to effectively shorten the length of solid tool, and effectively reduce manufacturing cost；Meanwhile, on
State the structure composition of optimal design-aside rationally, it is easy to promote and implement.
Those skilled in the art should be understood that, although the embodiment disclosed by the embodiment of the present invention is as above, but described
Content only readily appreciate the embodiment of the present invention and the embodiment that uses, be not limited to the embodiment of the present invention.Any
Technical staff in embodiment of the present invention art, in the premise without departing from the spirit and scope disclosed by the embodiment of the present invention
Under, any amendment and change can be carried out in the form implemented and details, but the scope of patent protection of the embodiment of the present invention,
Still must be defined in the range of standard with appending claims.
Claims (9)
1. a magnetic force storm valve, it is characterised in that
Including mandrel, the first shell and the valve seat being sleeved on the first shell bottom, the ring between described mandrel and the first shell
Shape cavity is provided with magnetic and floats assembly；The top of described ring-shaped cavity is set to the mobile terminal that the end with plunger assembly is connected, bottom
It is set to the fixing end being connected with the first shell；Described magnetic floating mechanism includes two Magnet that homopolarity is oppositely arranged, and two Magnet divide
It is not arranged on mobile terminal and fixing end；
Described mandrel is set to fixing connection plunger assembly, and the top of described plunger assembly is provided with pressurizing port, the bottom of described mandrel
It is provided with the valve plate being connected with valve seat bottom torsion spring；Described pressurizing port suppress operation, be set to drive plunger assembly band moving mandrel,
The Magnet of mobile terminal together moves down and backs down valve plate.
Magnetic force storm valve the most according to claim 1, it is characterised in that
Also include top connection, transition joint, lower contact；It is set to be set in the top of transition joint inside the bottom of described top connection
Outside, the Basolateral of described transition joint is set to be set in the top inner side of the first shell, the cavity of described transition joint
Body is set to be set with mandrel, and described lower contact is set to be set in the Basolateral of the first shell, and described valve seat is set to be set in first
Inside the bottom of shell；Described top connection is provided with described pressurizing port, and described transition joint is provided with described plunger assembly and installation
The through hole of plunger assembly.
Magnetic force storm valve the most according to claim 2, it is characterised in that
Described plunger assembly includes plunger, the seal nipple being located at plunger top, is located at the pressure cap of plunger bottom and is sleeved on
The seal assembly of sealing is cooperatively formed outside plunger and with the through hole of transition joint.
Magnetic force storm valve the most according to claim 3, it is characterised in that
The bottom of described pressure cap is provided with connecting rod, and described connecting rod is provided with the step surface promoting mandrel to move down, and described mandrel is provided with
Coordinate the shoulder structure of step surface action；The bottom of described connecting rod is provided with and pushes away cap, described in push away the bottom of cap and be set to promote Magnet
The end face moved down, described in push away cap and be additionally provided with and promote the inclined-plane moved in shoulder structure.
5. according to described magnetic force storm valve arbitrary in claim 2-4, it is characterised in that
Described valve plate is provided with tapered plug and installs the taper hole of tapered plug, and described tapered plug is connected with the flat spring being inserted in taper hole.
Magnetic force storm valve the most according to claim 5, it is characterised in that
Described first shell is set to Magnet set.
Magnetic force storm valve the most according to claim 6, it is characterised in that
The top perisporium of described transition joint is provided with the external screw thread being connected with top connection, and bottom perisporium is provided with Magnet set even
The external screw thread connect.
Magnetic force storm valve the most according to claim 6, it is characterised in that the bottom perisporium of described Magnet set is provided with
The female thread that the external screw thread being connected with lower contact is connected with valve seat.
Magnetic force storm valve the most according to claim 6, it is characterised in that
Described torsion spring is arranged on the bearing pin running through valve seat and valve plate, and one end of described torsion spring is set to connecting valve seat, described torsion spring
The other end be set to connect valve plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610626036.XA CN106246137A (en) | 2016-08-02 | 2016-08-02 | A kind of magnetic force storm valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610626036.XA CN106246137A (en) | 2016-08-02 | 2016-08-02 | A kind of magnetic force storm valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106246137A true CN106246137A (en) | 2016-12-21 |
Family
ID=57606411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610626036.XA Pending CN106246137A (en) | 2016-08-02 | 2016-08-02 | A kind of magnetic force storm valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106246137A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109441377A (en) * | 2018-10-30 | 2019-03-08 | 张家俊 | A kind of petroleum drilling device |
| CN112412396A (en) * | 2020-11-19 | 2021-02-26 | 中国石油大学(北京) | Downhole safety valve |
| CN114961642A (en) * | 2022-05-18 | 2022-08-30 | 西南石油大学 | Fully-electrically-controlled intelligent downhole safety valve |
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| CA2820283A1 (en) * | 2013-06-19 | 2014-12-19 | Giant Oil Tools Ltd. | Valve and method for hydraulic fracturing |
| CN204163689U (en) * | 2014-08-11 | 2015-02-18 | 吴大伟 | A kind of electromagnetism storm valve |
| CN204571917U (en) * | 2015-04-15 | 2015-08-19 | 中国石油集团渤海钻探工程有限公司 | Magnetic force reduction type float collar float plug |
| CN204609834U (en) * | 2015-05-11 | 2015-09-02 | 中国海洋石油总公司 | A kind of ceramics plate type leak-resistance valve |
| CN205036928U (en) * | 2015-09-28 | 2016-02-17 | 三峡大学 | Constant voltage valve that can automatic relief pressure |
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2016
- 2016-08-02 CN CN201610626036.XA patent/CN106246137A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2820283A1 (en) * | 2013-06-19 | 2014-12-19 | Giant Oil Tools Ltd. | Valve and method for hydraulic fracturing |
| CN203716929U (en) * | 2014-01-11 | 2014-07-16 | 中国石油化工股份有限公司 | Deep well safety valve |
| CN203880160U (en) * | 2014-06-18 | 2014-10-15 | 皖西学院 | Magnet type one-way valve |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109441377A (en) * | 2018-10-30 | 2019-03-08 | 张家俊 | A kind of petroleum drilling device |
| CN112412396A (en) * | 2020-11-19 | 2021-02-26 | 中国石油大学(北京) | Downhole safety valve |
| CN112412396B (en) * | 2020-11-19 | 2021-10-26 | 中国石油大学(北京) | Downhole safety valve |
| CN114961642A (en) * | 2022-05-18 | 2022-08-30 | 西南石油大学 | Fully-electrically-controlled intelligent downhole safety valve |
| CN114961642B (en) * | 2022-05-18 | 2023-02-03 | 西南石油大学 | Fully-electrically-controlled intelligent downhole safety valve |
| US11732551B1 (en) | 2022-05-18 | 2023-08-22 | Southwest Petroleum University | Fully electrically controlled intelligent subsurface safety valve |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Applicant after: China Offshore Oil Group Co., Ltd. Applicant after: China Oilfield Services Limited Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Applicant before: China National Offshore Oil Corporation Applicant before: China Oilfield Services Limited |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161221 |