CN101265788A - Y tube anti-pollution method and its apparatus - Google Patents
Y tube anti-pollution method and its apparatus Download PDFInfo
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- CN101265788A CN101265788A CNA2008101049147A CN200810104914A CN101265788A CN 101265788 A CN101265788 A CN 101265788A CN A2008101049147 A CNA2008101049147 A CN A2008101049147A CN 200810104914 A CN200810104914 A CN 200810104914A CN 101265788 A CN101265788 A CN 101265788A
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Abstract
The invention discloses a Y tube pollution-prevention method and a device thereof. The method comprises the following steps: (a) descending an underground switch to the preset position through a salvage tube and then lifting up the salvage tube; (b) sleeving the docking and sealing tube onto the underground switch from bottom to top sequentially, and connecting the upper part of the tube with holes with the Y joint that is provided with an electric pipe unit and a production blocking device; (c) lifting the docking and sealing tube after washing the well circularly to break the docking and sealing tube away from the underground switch, and the baffle on the underground switch closes automatically and stays in the well to avoid the well-washing liquid from leaking into the stratum. Compared with the method relying on casting and salving blocking device, the Y tube pollution-prevention method avoids the problem of being unable to salvage the pollution-prevention blocking device and increases the reliability of the technology.
Description
Technical field
The present invention relates to a kind of Y type flow string and carry out the down-hole lost circulation prevention technology used in the oil well of oil producing operation, relate in particular to a kind of Y tube anti-pollution method and device thereof.
Background technology
Adopt Y type flow string to carry out the oil well of oil producing operation in order to solve because flushing fluid immerses the formation contaminant problem that cause on the stratum, reach and shorten the production capacity purpose of recovery time, simultaneously also for oil well test power tool string pass through or the injection of de-plugging operation de-plugging agent provides the passage that can open under specific circumstances, offshore oilfield generally adopts following anti-pollution process technology (as Fig. 1) at present: in Fig. 1: 1-1, and------------------------landing nipple 1-9---inserts sealing 1-10---tail pipe 1-11---packer to anti-pollution blanking plug 1-8 to anti-pollution seating nipple 1-7 to Butt sealing tube 1-6 to ported sub 1-5 to electric pump unit 1-3 to Y joint 1-2 to produce blanking plug 1-4; During the oil well completion operation, the seating nipple of an anti-pollution blanking plug 1-3 is set above the well head packer; Before the well-flushing,, drop into an anti-pollution blanking plug 1-7, block unique passage that flushing fluid enters the stratum by steel wire operation; Well-flushing then; After well-flushing finishes, by steel wire operation, pull anti-pollution blanking plug 1-7 out again.Can't miss in the stratum though this technology can be guaranteed flushing fluid, there is certain risk in the process of pulling blanking plug, through regular meeting anti-pollution blanking plug takes place and meets the situation that card can't be salvaged, and need steel wire operation twice, and operating cost is higher.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of simple to operate, stable performance is provided, do not need steel wire operation, can satisfy offshore oilfield simultaneously and adopt Y type flow string to carry out a kind of Y tube anti-pollution method and the device thereof of two aspect needs such as the anti-pollution well-flushing of oil well of oil producing operation and de-plugging operation.
Y tube anti-pollution method of the present invention, it may further comprise the steps:
(a) utilize Y tube anti-pollution fishing socket that the location sealing station that down-hole switch is lowered into oil reservoir packer top is proposed described Y tube anti-pollution fishing socket then;
(b) from the bottom to top successively with the Butt sealing jacket casing on described down-hole switch, the top with single ball valve links to each other with the ported sub bottom then.And the top of its underpart with described Butt sealing tube linked to each other, top with ported sub links to each other with the Y joint that has electric pump unit and production blanking plug again, the weight of described Butt sealing tube and displacement force the baffle plate of down-hole switch to be opened after pressure balance, in the manufacturing process afterwards, this opening remains, and the injection channel that produces passage, test channel and acidizing treatment acid solution is provided for oil well; Before workover treatment, throw steel ball in single ball valve on described Butt sealing tube top after, can carry out circulation well cleanup;
(c) carry described Butt sealing tube on after the circulation well cleanup so that Butt sealing tube and down-hole switch break away from, the baffle plate on the down-hole switch is closed automatically and is stayed in the well, makes flushing fluid can't miss in the stratum;
(d) descend Butt sealing jacket casing repeating step (a)-(d) again.
A kind of Y tube anti-pollution device of realizing the Y tube anti-pollution method, it comprises the Y joint that has the electric pump unit and produce blanking plug, be connected the ported sub of the oil-in of described Y joint, the bottom of described ported sub links to each other with the top of single ball valve, the bottom of described single ball valve links to each other with the top of Butt sealing tube, it also comprises a Y tube self-balance type down-hole switch, described switch comprises top connection, one is moved cover, its periphery has a plurality of gathering sills uniformly in the external surface upper edge of described top connection, on described top connection body, have pin hole, a toilet lid shape baffle plate is by being connected rotating being connected in the described top connection of linkage on the described pin hole, a valve seat is housed in described top connection, described baffle plate is pressed on the end face of described valve seat, the rear end inner surface of described top connection has groove, the front portion of a following seating nipple is connected the top connection that is positioned at described valve seat rear portion, have a plurality of through holes at described seating nipple body down, described mobile cover comprises cover adapter sleeve and the guide head thereon that is connected with each other and be slidingly fitted with described down seating nipple, the a plurality of elastic claws that link to each other with described guide head, on the external surface at the end of described each elastic claw and middle part, be respectively arranged with two highly different boss, described end boss is lower than the middle part boss, described end boss can be inserted in the cooperation that fastens with it in the Baltimore groove of described top connection inner surface bottom, the boss at described middle part simultaneously is that right angle and the one side that links to each other with the end boss are the inclined-plane, described Butt sealing jacket casing is in described mobile cover and top connection, its top is provided with a single ball seat, its underpart inner surface has Baltimore groove and cooperates to fasten with described middle part boss, its inside also be provided with described top connection external surface on the gathering sill opened locate dive key cooperation and that contact and cooperate with described baffle plate afterbody mutually, described seating nipple down seals 9 with landing nipple 8 that is arranged on the top packer position and location and links to each other successively.
This method is compared with leaning on pulling blanking plug method, in implementation process, the problem of having avoided anti-pollution blanking plug to salvage, increase the reliability of technology and adopt apparatus of the present invention salvage in can carrying out or the outer pressure balance of salvaging, can realize opening early stage, can realize with the flow string Butt sealing, by flow string weight and displacement realize down-hole switch enforced opening, realize closing automatically of down-hole switch by spring action.
Description of drawings
Fig. 1 is former Antipollution method tubing string figure;
Fig. 2 is Y tube anti-pollution method tubing string figure of the present invention;
Fig. 3 A is the structural representation of the Y tube self-balance type down-hole switch in apparatus of the present invention;
Fig. 3 B is the expanded view of the top connection of the Y tube self-balance type down-hole switch shown in Fig. 3 A;
Fig. 4 is the structural representation of the elastic claw shown in Fig. 3 A;
Fig. 5 is the front view of the baffle plate shown in Fig. 3 A;
Fig. 6 is the left view of baffle plate shown in Figure 5;
Fig. 7 A is that elastic claw begins to move down under the effect of Butt sealing tube, and baffle plate is in closed condition under spring action;
Fig. 7 B is the A-A partial enlarged drawing at the elastic claw place of Fig. 7 A;
Fig. 8 A is that the Butt sealing tube continues to move down, and flat being good for of inner orientation contacts with the baffle plate afterbody, and baffle plate begins to open;
Fig. 8 B is the B-B partial enlarged drawing at Fig. 8 A baffle plate place;
Fig. 9 A is the baffle plate complete opening, and elastic claw moves down into down the seating nipple lower end together with the Butt sealing tube simultaneously;
Fig. 9 B is the C-C partial enlarged drawing at Fig. 9 A baffle plate place;
Fig. 9 C is the D-D partial enlarged drawing at Fig. 9 A elastic claw place;
Figure 10 is single ball-valve structure schematic diagram.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to describe in detail.
Y tube anti-pollution method of the present invention, it may further comprise the steps: (a) utilize Y tube anti-pollution fishing socket that the location sealing station that down-hole switch is lowered into oil reservoir packer top is proposed described Y tube anti-pollution fishing socket then; (b) from the bottom to top successively with the Butt sealing jacket casing on described down-hole switch, the top with single ball valve links to each other with the ported sub bottom then, and the top of its underpart with described Butt sealing tube linked to each other, top with ported sub links to each other with the Y joint that has electric pump unit and production blanking plug again, the weight of described Butt sealing tube and displacement force the baffle plate of down-hole switch to be opened after pressure balance, in the manufacturing process afterwards, this opening remains, and the injection channel that produces passage, test channel and acidizing treatment acid solution is provided for oil well; Before workover treatment, throw steel ball in single ball valve on described Butt sealing tube top after, can carry out circulation well cleanup; (c) carry described Butt sealing tube on after the circulation well cleanup so that Butt sealing tube and down-hole switch break away from, the baffle plate on the down-hole switch is closed automatically and is stayed in the well, makes flushing fluid can't miss in the stratum; (d) descend Butt sealing jacket casing repeating step (a)-(d) again.
Y tube anti-pollution device of the present invention shown in Fig. 2-10, it comprises the Y joint 1 that has electric pump unit 2 and produce blanking plug 3, be connected the ported sub 4 of the oil-in of described Y joint, the bottom of described ported sub 4 links to each other with the top of single ball valve 5, the bottom of described single ball valve 5 links to each other with the top of Butt sealing tube 6, it also comprises Y tube self-balance type down-hole switch 7, described switch comprises top connection 12, one is moved cover, its periphery has a plurality of gathering sills uniformly in the external surface upper edge of described top connection, on described connector body, have pin hole, a toilet lid shape baffle plate 21 is by being connected rotating being connected in the described top connection 12 of linkage on the described pin hole, a valve seat 23 is housed in described top connection, described baffle plate 21 is pressed on the end face of described valve seat 23, the rear end inner surface of described top connection has groove 16, the front portion of a following seating nipple 20 is connected the top connection that is positioned at described valve seat 23 rear portions, have a plurality of through holes on seating nipple 20 bodies down described, described mobile cover comprises cover adapter sleeve 18 and the guide head 19 thereon that is connected with each other and be slidingly fitted with described down seating nipple, the a plurality of elastic claws 17 that link to each other with described guide head 19, on the external surface at the end of described each elastic claw and middle part, be respectively arranged with two highly different boss 27,28, the lower boss 27 in described end can be inserted in the cooperation that fastens with it in the Baltimore groove 16 of described top connection inner surface bottom, the middle part are right angles than high boss 28 one sides, the one side that links to each other with the end boss is the inclined-plane.Described Butt sealing jacket casing in described mobile cover and top connection 12, its underpart inner surface has Baltimore groove and cooperates to fasten with described middle part boss, its inside be provided with described top connection external surface on the gathering sill opened locate dive key cooperation and that contact and cooperate with described baffle plate afterbody mutually, described seating nipple 20 down seals 9 with landing nipple 8 that is arranged on the top packer position and location and links to each other successively.The lower boss 27 in described end can rely on the tension force of self to be suspended in the Baltimore groove 16 of top connection 12 inner surface bottoms, also can break away from the Baltimore groove of top connection 12 inner surface bottoms in the after-contraction that is squeezed; The boss 28 at its middle part also can rely on the tension force of self to be suspended in the Baltimore groove of Butt sealing tube 6 bottoms, also can be in the after-contraction that is squeezed, the Baltimore groove that breaks away from Butt sealing tube 6 bottoms, it is the right angle that the boss at middle part is designed to one side, one side is the shape on slope, this boss can only be compressed along the one side on slope, thus guarantee elastic claw 17 only with could break away from the Baltimore groove of Butt sealing tube 6 bottoms after top connection 12 contacts, and can not break away from midway.
Described gathering sill is Y shape gathering sill 24, J-shaped groove 25 and the straight trough 26 that links to each other successively, and the degree of depth of described straight trough is shallower than the degree of depth of described J-shaped groove.Wherein Y shape gathering sill cooperates with the J-shaped groove, guides anti-pollution fishing socket accurately to locate; Y shape gathering sill cooperates with straight trough, and guiding Butt sealing tube 6 is accurately located with the tail end of baffle plate 21, and accurately docks with mobile cover; J-shaped groove and straight trough are set to different depth, avoid the running orbit of anti-pollution fishing socket and Butt sealing tube 6 to interfere mutually.Described linkage comprises the pivot pin that is connected in the described pin hole and is with spring 14 thereon, banking pin 15 is equipped with at two ends at described pivot pin respectively, the profile at the position of the tail end band pin shaft hole of described baffle plate is preferably semicircular arc, the cambered surface of described semi arch is close to the supporting surface in the top connection 12, both improved the force-bearing situation of axis pin of the spring 13, and can guarantee that again baffle plate 21 rotated flexibly around axis pin of the spring 13.It is loosening to prevent valve seat preferably to be connected with an anticreep pin 22 between the valve body of the body of described top connection and valve seat.
Use the operating process of Y pipe self-balancing down-hole switch of the present invention to be:
Produce Butt sealing tube, single ball valve, ported sub, connection wye, electric pump that the butt joint tubing string connects the inside tape guide flat key of a special use from the bottom to top successively, G.I.H;
The inner orientation flat key of Butt sealing tube continues descending under the guiding of the Y shape gathering sill of top connection 12 external surfaces and straight trough;
Shown in Fig. 7 A, Fig. 7 B, the Butt sealing tube at first contacts with mobile cover, tubing string gravity forces the boss on the elastic claw 17 to shrink, move the Baltimore groove that cover breaks away from top connection 12 inner surface bottoms, edge seating nipple 20 down moves down, expose the through hole on seating nipple 20 body tops down, discharge the pressure of seating nipple 20 internal chamber, the pressure of baffle plate chamber about in the of 21 is tended to balance;
Shown in Fig. 8 A, Fig. 8 B, Fig. 9 A, Fig. 9 B, the inner orientation flat key of Butt sealing tube contacts with the tail end of baffle plate 21 after the pressure balance of baffle plate chamber about in the of 21, tubing string gravity presses down the afterbody of baffle plate 21, force baffle plate 21 around axis pin of the spring 13, upwardly open, and keep normally open.
The oil well ordinary production:
Because Y pipe self-balancing down-hole switch is in the enable possition, for oil well provides the injection channel that produces passage, test channel and acidizing treatment acid solution, can not influence production, test or the measure operation of oil well.
Well workover:
At first, drop into steel ball from well head to the down-hole, stop up the valve seat on the Butt sealing tube, interim shutoff flushing fluid immerses unique passage on stratum; Well-flushing then;
After well-flushing is finished, on carry the Butt sealing tube.Boss on the elastic claw 17 is suspended on Butt sealing tube tail end by self tension force, makes to move cover along moving on the seating nipple 20 down, inserts the Baltimore groove of top connection 12 inner surface bottoms again until mobile cover, and the through hole on seating nipple 20 body tops is closed; Simultaneously, when mobile cover inserted the Baltimore groove of top connection 1 inner surface bottom again, Butt sealing tube pulling force forced the boss on the elastic claw 17 to shrink, and the boss on the elastic claw 17 breaks away from Butt sealing tube tail end; Move on the Butt sealing tube continues, after the tubing string gravity that acts on baffle plate 21 tail ends discharged, baffle plate 21 recovered closed condition under the active force of spring 14.
Salvage:
Be lowered to the special-purpose pulling and running tool of inner tape guide flat key.Dive key enters the cecum of J-shaped groove under the guiding of the Y shape gathering sill of top connection 12 external surfaces and J-shaped groove, drag for Y pipe self-balancing down-hole switch.
(a) utilize Y tube anti-pollution fishing socket that the location sealing station that down-hole switch is lowered into oil reservoir packer top is proposed described Y tube anti-pollution fishing socket then; (b) from the bottom to top successively with the Butt sealing jacket casing on described down-hole switch, the top with single ball valve links to each other with the ported sub bottom then, and the top of its underpart with described Butt sealing tube linked to each other, top with ported sub links to each other with the Y joint that has electric pump unit and production blanking plug again, the weight of described Butt sealing tube and displacement force the baffle plate of down-hole switch to be opened after pressure balance, in the manufacturing process afterwards, this opening remains, and the injection channel that produces passage, test channel and acidizing treatment acid solution is provided for oil well; Before workover treatment, throw steel ball in single ball valve on described Butt sealing tube top after, can carry out circulation well cleanup; (c) carry described Butt sealing tube on after the circulation well cleanup so that Butt sealing tube and down-hole switch break away from, the baffle plate on the down-hole switch is closed automatically and is stayed in the well, makes flushing fluid can't miss in the stratum; (d) descend Butt sealing jacket casing repeating step (a)-(d) again.
Adopt the anti-pollution blanking plug of said method to be easy to salvage, salvage in can carrying out or the outer pressure balance of salvaging, can realize opening early stage, can realize with Butt sealing tube Butt sealing, by Butt sealing tube weight and displacement realize down-hole switch enforced opening, realize closing automatically of down-hole switch by spring action.
Claims (6)
1.Y tube anti-pollution method is characterized in that it may further comprise the steps:
(a) utilize Y tube anti-pollution fishing socket that the location sealing station that down-hole switch is lowered into oil reservoir packer top is proposed described Y tube anti-pollution fishing socket then;
(b) from the bottom to top successively with the Butt sealing jacket casing on described down-hole switch, the top with single ball valve links to each other with the ported sub bottom then, and the top of its underpart with described Butt sealing tube linked to each other, top with ported sub links to each other with the Y joint that has electric pump unit and production blanking plug again, the weight of described Butt sealing tube and displacement force the baffle plate of down-hole switch to be opened after pressure balance, in the manufacturing process afterwards, this opening remains, and the injection channel that produces passage, test channel and acidizing treatment acid solution is provided for oil well; Before workover treatment, throw steel ball in single ball valve on described Butt sealing tube top after, can carry out circulation well cleanup;
(c) carry described Butt sealing tube on after the circulation well cleanup so that Butt sealing tube and down-hole switch break away from, the baffle plate on the down-hole switch is closed automatically and is stayed in the well, makes flushing fluid can't miss in the stratum;
(d) descend Butt sealing jacket casing repeating step (a)-(d) again.
2. Y tube anti-pollution device of realizing the described method of claim 1, it comprises the Y joint that has the electric pump unit and produce blanking plug, be connected the ported sub of the oil-in of described Y joint, the bottom of described ported sub links to each other with the top of single ball valve, the bottom of described single ball valve links to each other with the top of Butt sealing tube, it is characterized in that: it also comprises a Y tube self-balance type down-hole switch, described switch comprises top connection, one is moved cover, its periphery has a plurality of gathering sills uniformly in the external surface upper edge of described top connection, on described top connection body, have pin hole, a toilet lid shape baffle plate is by being connected rotating being connected in the described top connection of linkage on the described pin hole, a valve seat is housed in described top connection, described baffle plate is pressed on the end face of described valve seat, the rear end inner surface of described top connection has groove, the front portion of a following seating nipple is connected the top connection that is positioned at described valve seat rear portion, have a plurality of through holes at described seating nipple body down, described mobile cover comprises cover adapter sleeve and the guide head thereon that is connected with each other and be slidingly fitted with described down seating nipple, the a plurality of elastic claws that link to each other with described guide head, on the external surface at the end of described each elastic claw and middle part, be respectively arranged with two highly different boss, described end boss is lower than the middle part boss, the boss of described end can be inserted in the cooperation that fastens with it in the Baltimore groove of described top connection inner surface bottom, described middle part boss simultaneously is that right angle and the one side that links to each other with the end boss are the inclined-plane, described Butt sealing jacket casing is in described mobile cover and top connection, its top is provided with a single ball seat, its underpart inner surface has Baltimore groove and cooperates to fasten with described middle part boss, its inside also be provided with described top connection external surface on the gathering sill opened locate dive key cooperation and that contact and cooperate with described baffle plate afterbody mutually, described seating nipple down seals 9 with landing nipple 8 that is arranged on the top packer position and location and links to each other successively.
3. Y tube anti-pollution device according to claim 1 is characterized in that: Y shape gathering sill, J-shaped groove and the straight trough of described gathering sill for linking to each other successively, the degree of depth of described straight trough is shallower than the degree of depth of described J-shaped groove.
4. Y tube anti-pollution device according to claim 1 is characterized in that: the profile at the position of the band pin shaft hole of described baffle plate is a semicircular arc.
5. Y tube anti-pollution device according to claim 1 is characterized in that: described linkage comprises the pivot pin that is connected in the described pin hole and is with spring thereon, at the two ends of described pivot pin banking pin is housed respectively.
6. Y tube anti-pollution device according to claim 1 is characterized in that: be connected with an anticreep pin between the valve body of the body of described top connection and valve seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101049147A CN101265788B (en) | 2008-04-24 | 2008-04-24 | Y tube anti-pollution method and its apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101049147A CN101265788B (en) | 2008-04-24 | 2008-04-24 | Y tube anti-pollution method and its apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101265788A true CN101265788A (en) | 2008-09-17 |
| CN101265788B CN101265788B (en) | 2011-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101049147A Expired - Fee Related CN101265788B (en) | 2008-04-24 | 2008-04-24 | Y tube anti-pollution method and its apparatus |
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| Country | Link |
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| CN (1) | CN101265788B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321625A (en) * | 2013-07-09 | 2013-09-25 | 中国石油集团渤海钻探工程有限公司 | Rotation-free locking ring type sliding sleeve with ball seat capable of being taken out |
| CN103321608A (en) * | 2013-07-09 | 2013-09-25 | 中国石油集团渤海钻探工程有限公司 | Rotation-free pawl-type sliding sleeve with ball seat capable of being taken out |
| CN105221113A (en) * | 2015-09-21 | 2016-01-06 | 中国海洋石油总公司 | A kind of Y tube anti-pollution tubing string based on solubility ball and anti-pollution production method |
| CN111287716A (en) * | 2020-02-25 | 2020-06-16 | 中国海洋石油集团有限公司 | Downhole flow-assisting separate-layer water injection pipe column for offshore oil field |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4040488A (en) * | 1976-09-27 | 1977-08-09 | The Dow Chemical Company | Differential valve |
| US4185690A (en) * | 1978-06-12 | 1980-01-29 | Baker International Corporation | Backsurge well cleaning tool |
| CN87215651U (en) * | 1987-11-14 | 1988-11-16 | 王兴林 | Well-killing prevention switch for oil-pumping well |
| CN2519016Y (en) * | 2001-09-28 | 2002-10-30 | 大庆隆格石油技术有限公司 | Snubbing service downhole switching device |
| US7178600B2 (en) * | 2002-11-05 | 2007-02-20 | Weatherford/Lamb, Inc. | Apparatus and methods for utilizing a downhole deployment valve |
-
2008
- 2008-04-24 CN CN2008101049147A patent/CN101265788B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321625A (en) * | 2013-07-09 | 2013-09-25 | 中国石油集团渤海钻探工程有限公司 | Rotation-free locking ring type sliding sleeve with ball seat capable of being taken out |
| CN103321608A (en) * | 2013-07-09 | 2013-09-25 | 中国石油集团渤海钻探工程有限公司 | Rotation-free pawl-type sliding sleeve with ball seat capable of being taken out |
| CN105221113A (en) * | 2015-09-21 | 2016-01-06 | 中国海洋石油总公司 | A kind of Y tube anti-pollution tubing string based on solubility ball and anti-pollution production method |
| CN111287716A (en) * | 2020-02-25 | 2020-06-16 | 中国海洋石油集团有限公司 | Downhole flow-assisting separate-layer water injection pipe column for offshore oil field |
| CN111287716B (en) * | 2020-02-25 | 2022-06-03 | 中国海洋石油集团有限公司 | Downhole flow-assisting separate-layer water injection pipe column for offshore oil field |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101265788B (en) | 2011-12-28 |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: CNOOC Energy Development Co., Ltd. Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: CNOOC Energy Development Co., Ltd. Patentee before: China National Offshore Oil Corporation |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20210424 |
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| CF01 | Termination of patent right due to non-payment of annual fee |