CN104295250B - Screen annulus sand-washing tubular column - Google Patents
Screen annulus sand-washing tubular column Download PDFInfo
- Publication number
- CN104295250B CN104295250B CN201410532225.1A CN201410532225A CN104295250B CN 104295250 B CN104295250 B CN 104295250B CN 201410532225 A CN201410532225 A CN 201410532225A CN 104295250 B CN104295250 B CN 104295250B
- Authority
- CN
- China
- Prior art keywords
- sliding sleeve
- sand
- tubing
- annular space
- fastenedly connected
- 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.)
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Links
- 238000005406 washing Methods 0.000 title abstract description 24
- 210000002445 nipple Anatomy 0.000 claims abstract description 16
- 239000010985 leather Substances 0.000 claims abstract description 10
- 230000007246 mechanism Effects 0.000 claims description 36
- 239000004576 sand Substances 0.000 claims description 32
- 238000011010 flushing procedure Methods 0.000 claims description 16
- 238000004080 punching Methods 0.000 claims 1
- 238000012856 packing Methods 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B34/12—Valve arrangements for boreholes or wells in wells operated by movement of casings or tubings
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/06—Sleeve valves
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention relates to a screen annulus sand-washing tubular column. The screen annulus sand-washing tubular column is characterized in that the screen annulus sand-washing tubular column sequentially comprises an upper packing leather packer, a high-pressure sand-washing tube, a lower packing leather packer, a sliding sleeve closing tool, a sliding sleeve switch tool, a load display, and a check valve from top to bottom, wherein the upper end of the upper packing leather packer is connected with an oil tube through an oil tube buckle, the lower end of the upper packing leather packer is connected with the upper end of the high-pressure sand-washing tube through an oil tube buckle, the lower end of the high-pressure sand-washing tube is connected with the upper end of the lower packing leather packer through an oil tube buckle, the lower end of the lower packing leather packer is connected with the upper end of the sliding sleeve closing tool, the lower end of the sliding sleeve closing tool is connected with the upper end of a tubing nipple through an oil tube buckle, the lower end of the tubing nipple is connected with the upper end of the sliding sleeve switch tool through an oil tube buckle, the lower end of the sliding sleeve switch tool is connected with the upper end of the tubing nipple through an oil tube buckle, the lower end of the tubing nipple is connected with the upper end of the load display through an oil tube buckle, and the lower end of the load display is connected with the upper end of the check valve. According to the screen annulus sand-washing tubular column, work of sliding sleeve opening, sand-washing operation, well washing operation and sliding sleeve closing is completed by means of the tubular column, so that a working cycle is effectively shortened.
Description
Technical field
The present invention relates to a kind of sand-flushing pipe column, especially with regard to a kind of screen jacket annular space sand-flushing pipe column.
Background technology
At present, in known oil well production process, because reservoir sand and fine grained are from stratum output, therefore easily block up
Plug screen casing and screen jacket annular space, leads to permeability reduction, causes oil well productivity to be gradually lowered and the problems such as screen cutting destroys, often
The sand-flushing pipe column of rule enters many times tubing strings under needing, and operation process is relatively cumbersome, and the sand washing operation cycle is longer simultaneously.
Content of the invention
For the problems referred to above, it is an object of the invention to provide a kind of can enter under one time and be capable of rushing of screen jacket annular space
The screen jacket annular space sand-flushing pipe column of sand de-plugging.
For achieving the above object, the present invention takes technical scheme below：A kind of screen jacket annular space sand-flushing pipe column, its feature exists
In：It from top to bottom includes a top cup packer, a high pressure sand clean out pipe, a bottom cup packer, a sliding sleeve pass successively
Close instrument, a sliding sleeve switch instrument, a loading indicator and a ball-and-seat；Tubing thread is passed through in described top cup packer upper end
It is fastenedly connected with oil pipe, described top cup packer lower end is fastenedly connected with described high pressure sand clean out pipe upper end by tubing thread；
Described high pressure sand clean out pipe lower end is fastenedly connected with described bottom cup packer upper end by tubing thread, and described bottom leather cup insulates
Device lower end is fastenedly connected with described sliding bush closing tool upper end；Tubing thread and tubing nipple are passed through in described sliding bush closing tool lower end
Upper end is fastenedly connected, and described tubing nipple lower end is fastenedly connected with described sliding sleeve switch instrument upper end by tubing thread；Described cunning
Set switching tools lower end is fastenedly connected with another described tubing nipple upper end by tubing thread, and another described tubing nipple lower end is led to
Cross tubing thread to be fastenedly connected with described loading indicator upper end, described loading indicator lower end is with described ball-and-seat upper end fastening even
Connect.
One cup packer and a piston machine are provided with described top cup packer and described bottom cup packer
Structure.
Circumferentially arranged on the outer wall of described sliding bush closing tool have unidirectional step mechanisms, described unidirectional step mechanisms upper end
For arc excessive structural, lower end is the first right angle step structure；When above carrying this tubing string, the institute of described unidirectional step mechanisms lower end
State the first right angle step structure to contact with the boss on the bushing in sliding sleeve, promote and move on described bushing, make on described sliding sleeve
Through hole closure, realize the closing of described sliding sleeve.
Circumferentially arranged on the outer wall of described sliding sleeve switch instrument have two-way step mechanisms, and described two-way step mechanisms are upper and lower
Two ends are symmetrically arranged with two second right angle step structures；When above carrying this tubing string, described the of described two-way step mechanisms lower end
Two right angle step structures are contacted with the described boss on the bushing in described sliding sleeve, promote and move on described bushing, make described cunning
Set is closed；When transferring this tubing string, in described second right angle step structure of described two-way step mechanisms upper end and described sliding sleeve
Bushing on described boss contact, promote described bushing move down, so that the through hole on described sliding sleeve is opened, realize described sliding sleeve
Unlatching.
Circumferentially it is vertically installed with some row's nozzles on described high pressure sand clean out pipe surface.
Described loading indicator is provided with an elastic mechanism, and described ball-and-seat bottom is set to notch-cut type guide shoe structure.
Due to taking above technical scheme, it has advantages below to the present invention：1st, the present invention is due to complete using one-trip string
Become to open the work of sliding sleeve, sand washing operation, clean-out service and closedown sliding sleeve, therefore effectively shorten duty cycle.2nd, the present invention
Construction operation step is simple, sand washing operation field good operability.3rd, the present invention is due to using high pressure sand cleaning fluid sand washing, therefore working
Efficiency high, and have sand carrying effect while clearing up sand plug.4th, the present invention is due to carrying out restting using cup packer
And segmentation sand washing operation can be carried out to sand plug end during deblocking, therefore sand washing operation.
Brief description
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the position relationship schematic diagram of the present invention and screen casing and sleeve pipe；
Fig. 3 is the structural representation of the cup packer of the present invention；
Fig. 4 is the structural representation of the sliding sleeve of the present invention；
Fig. 5 is the close-up schematic view of the sliding bush closing tool of the present invention；
Fig. 6 is the close-up schematic view of the sliding sleeve switch instrument of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described in detail.
Fig. 1 shows the tubing string 100 that the present invention provides, and this tubing string 100 from top to bottom includes a top leather cup packing successively
Device 1, a high pressure sand clean out pipe 2, a bottom cup packer 3, a sliding bush closing tool 4, a sliding sleeve switch instrument 6, a load show
Show device 8 and a ball-and-seat 9.Top cup packer 1 upper end is fastenedly connected with oil pipe 10 by tubing thread, top cup packer
1 lower end is fastenedly connected with high pressure sand clean out pipe 2 upper end by tubing thread.Tubing thread and bottom leather cup are passed through in high pressure sand clean out pipe 2 lower end
Packer 3 upper end is fastenedly connected, and bottom cup packer 3 lower end is fastenedly connected with sliding bush closing tool 4 upper end.Sliding sleeve closes work
Have 4 lower ends to be fastenedly connected with tubing nipple 5 upper end by tubing thread, tubing thread and sliding sleeve switch work are passed through in tubing nipple 5 lower end
Have 6 upper ends to be fastenedly connected.Sliding sleeve switch instrument 6 lower end is fastenedly connected with tubing nipple 7 upper end by tubing thread, tubing nipple 7
Lower end is fastenedly connected with loading indicator 8 upper end by tubing thread, and loading indicator 8 lower end is fastenedly connected with ball-and-seat 9 upper end.
As shown in Figure 2 and Figure 3, in the above-described embodiments, top cup packer 1 and bottom cup packer 3 are respectively provided with
There are a piston mechanism 18 and a cup packer 19, in the case of building the pressure inside tubing string 100, piston mechanism 18 is under pressure downwards
Mobile promote cup packer 19, make that cup packer 19 is pressurized to be deformed, cup packer 19 is opened recoil and is encapsulated in screen casing 12 inwall
Realize the closure of sand washing section upper and lower side, cup packer recovery deformation after pressure release unseals automatically.
In the above-described embodiments, circumferentially it is vertically installed with some row's nozzles 17 on high pressure sand clean out pipe 2 surface, for rinsing
Sand plug between screen casing 12 and sleeve pipe 13 annular space.
As shown in Figure 4, Figure 5, in the above-described embodiments, on the outer wall of sliding bush closing tool 4 circumferentially arranged have one unidirectional
Step mechanisms 41, unidirectional step mechanisms 41 upper end is arc excessive structural, and lower end is the first right angle step structure.In upper lifting pipe post
When 100, the right angle step structure of unidirectional step mechanisms 41 lower end is contacted with the boss 15 on the bushing 14 in sliding sleeve 11, promotes
Moving on bushing 14, so that the through hole 16 on sliding sleeve 11 is closed, thus realizing the closing of sliding sleeve 11.
As shown in fig. 6, in the above-described embodiments, circumferentially arranged on the outer wall of sliding sleeve switch instrument 6 have a two-way step
Mechanism 61, two-way step mechanisms 61 upper and lower ends are symmetrically arranged with two second right angle step structures.In upper lifting pipe post 100, double
Contact with the boss 15 on the bushing 14 in sliding sleeve 11 to the right angle step structure of step mechanisms 61 lower end, promote on bushing 14
Move, so that sliding sleeve 11 is closed.When transferring tubing string 100, in the right angle step structure of two-way step mechanisms 61 upper end and sliding sleeve 11
Boss 15 on bushing 14 contacts, and promoting bushing 14 to move down, so that the through hole on sliding sleeve 11 is opened, thus realizing opening of sliding sleeve 11
Open.
In the above-described embodiments, loading indicator 8 is provided with an elastic mechanism, load ton can be detected when through sliding sleeve
Position change is such that it is able to judging sand washing position and tubing string 100 being positioned.
In the above-described embodiments, ball-and-seat 9 is a ball valve, and it passes through its internal valve port of ball-off that inside is arranged, real
Building the pressure within existing tubing string 100, ball-and-seat 9 bottom is set to notch-cut type guide shoe structure, can be prevented effectively from and enter to meet under tubing string 100
Resistance.
The present invention operationally, when being lowered into sliding sleeve position, can examine tubing string 100 by the loading indicator 8 of tubing string 100 lower end
Survey the change of load tonnage, and judge sand washing position, when continuing decentralization tubing string 100, sliding sleeve switch instrument 6 passes through two-way
Sliding sleeve 11 is opened by rank mechanism 61, and it is logical to set up circulation between the screen jacket annular space that screen casing 12 and sleeve pipe 13 are constituted and sliding sleeve 11
Road, after tubing string 100 continues to be lowered into design sand washing position, in ball-and-seat 9, its internal valve port is sealed by the pitching mechanism of setting,
Making to build the pressure inside tubing string 100, turn on pump adds high pressure washing liquid simultaneously, so that internal pressure is raised so that promoting top cup packer
1 and bottom cup packer 3 within piston mechanism 18 cup packer 19 is set on screen casing 12 inwall, realize sand washing section
The closure of upper and lower ends, makes high pressure washing liquid spray High-Pressure Water at high pressure sand clean out pipe 2 nozzle 17 to screen casing 12 and sleeve pipe 13
Between the sand plug of screen jacket annular space be rinsed, high pressure washing liquid will rinse lower impurity by the through hole 16 on sliding sleeve 11 simultaneously
Take out of, complete clean-out service.After the end of job, close pump or reduce pump impulse, tubing string 100 is above carried, sliding sleeve closes work simultaneously
Sliding sleeve 11 is closed and is recovered initial position by unidirectional step mechanisms 41 by tool 4, when continuing upper lifting pipe post 100, sliding sleeve switch
Instrument 6 cuts out it is ensured that sliding sleeve 11 normal switching-off through sliding sleeve 11 again to sliding sleeve 11.
The various embodiments described above are only used for the purpose of the present invention, technical scheme and beneficial effect have been carried out further specifically
Bright, it is not limited to the present invention, all any modification, equivalent substitution and improvement within the spirit and principles in the present invention, done
Deng should be included within the scope of the present invention.
Claims (10)
1. a kind of screen jacket annular space sand-flushing pipe column it is characterised in that：It from top to bottom includes a top cup packer, a height successively
Pressure sand clean out pipe, a bottom cup packer, a sliding bush closing tool, a sliding sleeve switch instrument, a loading indicator and a single current
Valve；Described top cup packer upper end is fastenedly connected with oil pipe by tubing thread, and described top cup packer lower end is passed through
Tubing thread is fastenedly connected with described high pressure sand clean out pipe upper end；Tubing thread and described bottom leather cup are passed through in described high pressure sand clean out pipe lower end
Packer upper end is fastenedly connected, and described bottom cup packer lower end is fastenedly connected with described sliding bush closing tool upper end；Described
Sliding bush closing tool lower end is fastenedly connected with tubing nipple upper end by tubing thread, described tubing nipple lower end pass through tubing thread with
Described sliding sleeve switch instrument upper end is fastenedly connected；Tubing thread and another described tubing nipple are passed through in described sliding sleeve switch instrument lower end
Upper end is fastenedly connected, and another described tubing nipple lower end is fastenedly connected with described loading indicator upper end by tubing thread, described
Loading indicator lower end is fastenedly connected with described ball-and-seat upper end.
2. as claimed in claim 1 a kind of screen jacket annular space sand-flushing pipe column it is characterised in that：Described top cup packer and institute
State and a cup packer and a piston mechanism are provided with bottom cup packer.
3. as claimed in claim 1 a kind of screen jacket annular space sand-flushing pipe column it is characterised in that：The outer wall of described sliding bush closing tool
Above circumferentially arranged have unidirectional step mechanisms, and described unidirectional step mechanisms upper end is arc excessive structural, and lower end is the first right angle
Ledge structure；When above carrying this tubing string, in described first right angle step structure of described unidirectional step mechanisms lower end and sliding sleeve
Boss on bushing contacts, and promotes and moves on described bushing, so that the through hole on described sliding sleeve is closed, realize the pass of described sliding sleeve
Close.
4. as claimed in claim 2 a kind of screen jacket annular space sand-flushing pipe column it is characterised in that：The outer wall of described sliding bush closing tool
Above circumferentially arranged have unidirectional step mechanisms, and described unidirectional step mechanisms upper end is arc excessive structural, and lower end is the first right angle
Ledge structure；When above carrying this tubing string, in described first right angle step structure of described unidirectional step mechanisms lower end and sliding sleeve
Boss on bushing contacts, and promotes and moves on described bushing, so that the through hole on described sliding sleeve is closed, realize the pass of described sliding sleeve
Close.
5. a kind of screen jacket annular space sand-flushing pipe column as described in claim 3 or 4 it is characterised in that：Described sliding sleeve switch instrument
Circumferentially arranged on outer wall have two-way step mechanisms, and described upper and lower two ends of two-way step mechanisms is symmetrically arranged with two second right angle platforms
Stage structure；When above carrying this tubing string, in described second right angle step structure of described two-way step mechanisms lower end and described sliding sleeve
Bushing on described boss contact, promote and move on described bushing, so that described sliding sleeve is closed；When transferring this tubing string, described
Described second right angle step structure of two-way step mechanisms upper end is contacted with the described boss on the bushing in described sliding sleeve, pushes away
Move described bushing to move down, so that the through hole on described sliding sleeve is opened, realize the unlatching of described sliding sleeve.
6. a kind of screen jacket annular space sand-flushing pipe column as claimed in claim 1 or 2 or 3 or 4 it is characterised in that：In the punching of described high pressure
Sandpipe surface is circumferentially vertically installed with some row's nozzles.
7. as claimed in claim 5 a kind of screen jacket annular space sand-flushing pipe column it is characterised in that：On described high pressure sand clean out pipe surface edge
Circumference is vertically installed with some row's nozzles.
8. a kind of screen jacket annular space sand-flushing pipe column as claimed in claim 1 or 2 or 3 or 4 it is characterised in that：Described load shows
Device is provided with an elastic mechanism, and described ball-and-seat bottom is set to notch-cut type guide shoe structure.
9. as claimed in claim 5 a kind of screen jacket annular space sand-flushing pipe column it is characterised in that：Described loading indicator is provided with one
Elastic mechanism, described ball-and-seat bottom is set to notch-cut type guide shoe structure.
10. as claimed in claim 6 a kind of screen jacket annular space sand-flushing pipe column it is characterised in that：Described loading indicator is provided with
One elastic mechanism, described ball-and-seat bottom is set to notch-cut type guide shoe structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410532225.1A CN104295250B (en) | 2014-10-10 | 2014-10-10 | Screen annulus sand-washing tubular column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410532225.1A CN104295250B (en) | 2014-10-10 | 2014-10-10 | Screen annulus sand-washing tubular column |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104295250A CN104295250A (en) | 2015-01-21 |
| CN104295250B true CN104295250B (en) | 2017-02-22 |
Family
ID=52315167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410532225.1A Active CN104295250B (en) | 2014-10-10 | 2014-10-10 | Screen annulus sand-washing tubular column |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104295250B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313761B (en) * | 2016-04-26 | 2019-06-07 | 中国石油化工股份有限公司 | A kind of pressure break hole opening/closing system |
| CN106437546B (en) * | 2016-11-04 | 2019-06-18 | 中国海洋石油集团有限公司 | A kind of hydraulic-controlled tap for pipe cleaning sand washing process |
| CN108204226B (en) * | 2017-12-18 | 2019-12-10 | 中国石油天然气股份有限公司 | sand prevention tubular column |
| CN111502609B (en) * | 2020-04-21 | 2022-06-03 | 中国海洋石油集团有限公司 | Water injection sand prevention pipe column capable of cleaning annular space of screen sleeve and well cleaning method |
| CN116122773B (en) * | 2022-11-25 | 2023-10-17 | 阜宁县宏达石化机械有限公司 | Single-double-tube combined jet pipe column |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6799645B2 (en) * | 2002-12-10 | 2004-10-05 | Shell Oil Company | Method and apparatus for drilling and completing a well with an expandable sand control system |
| CN201460772U (en) * | 2009-05-18 | 2010-05-12 | 胜利油田胜利泵业有限责任公司 | Self-sealing sand-flushing device |
| CN202673207U (en) * | 2012-06-20 | 2013-01-16 | 中国海洋石油总公司 | Sectioned sand-flushing tool |
| CN202788688U (en) * | 2012-09-24 | 2013-03-13 | 刘丽宁 | Underground well leakage-proof sand washing device |
| CN104074485B (en) * | 2014-06-27 | 2016-08-31 | 西安中孚凯宏石油科技有限责任公司 | A kind of horizontal well lost circulation prevention cyclone sand washing device device and sand washing process thereof |
| CN204098823U (en) * | 2014-10-10 | 2015-01-14 | 中国海洋石油总公司 | Screen jacket annular space sand-flushing pipe column |
-
2014
- 2014-10-10 CN CN201410532225.1A patent/CN104295250B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104295250A (en) | 2015-01-21 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Co-patentee after: CNOOC Energy Development Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation Co-patentee before: CNOOC Energy Development Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191212 Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC research institute limited liability company Patentee before: China Offshore Oil Group Co., Ltd. Co-patentee before: CNOOC Energy Development Co., Ltd. |