CN101074602A - Stratified injection tubular pile - Google Patents
Stratified injection tubular pile Download PDFInfo
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- CN101074602A CN101074602A CN 200710130334 CN200710130334A CN101074602A CN 101074602 A CN101074602 A CN 101074602A CN 200710130334 CN200710130334 CN 200710130334 CN 200710130334 A CN200710130334 A CN 200710130334A CN 101074602 A CN101074602 A CN 101074602A
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Abstract
The invention provides a hierarchical pouring polymer tube column which can avoid blocking and difficult cast. The tube column includes the out pouring oil tube and the inner pouring oil tube set in the out pouring oil tube, the inner/outer flow passage connected to the different oil layer in the inner pouring ploy oil tube and between the inner and out tube. The top of the inner and outer flow passage are connected with the pump station by the pouring polymer controlling device. The inner flow passage is connected with the oil layer by the closed interpolator and the outer flow passage is connected with the oil layer by the big duct sieve vessel. The pouring control device is the low sheared valve. The invention can be used in the hierarchical pouring oil extraction production.
Description
Technical field
The present invention relates to the polymer flooding oil-extraction technical field, especially, relate to a kind of stratified injection tubular pile that uses concentric double pipe.
Background technology
At present, the polymer flooding oil-extraction technology has become the important means of oilfield stable production.For the inhomogeneous formation oil field, the permeability of interlayer is often widely different.Therefore, take layered polymer injection technology and equipment in the field produces practice, so that annotate poly-to different oil reservoirs pointedly.
In concentric single pipe layered polymer injection technology instantly, carry out layered polymer injection by concentric single pipe layered tubing string.The down-hole part of this concentric single pipe layered tubing string comprises packer and annular relief groove injection allocation device.Wherein, the injection allocation device comprises injection allocation cover and injection allocation core.This injection allocation core can carry out pulling by steel wire, adjusts the amount of injection allocation by the length of adjusting the injection allocation core.The test channel that is used to survey layering injection rate and zonal pressure is left at injection allocation core center.Because the area of the annular gap between injection allocation cover and the injection allocation core roughly is equivalent to the water nozzle about diameter 15mm, therefore can make polymer solution under relative flow velocity, produce pressure drop, slow down the shear degradation of polymer solution to a certain extent.Yet, although above-mentioned way can realize certain layered polymer injection effect, still there are many problems:
One adopts the injection allocation device to shunt, and the annular gap between injection allocation cover and the injection allocation core is very little, is easy to result in blockage.When especially adopting clear water to join the notes polymerizing technology of sewage notes, reason such as relatively poor owing to sewage quality, that polymer dissolution is insufficient, it is blocked to cause the annular gap to be easy to, and a poly-wheat harvesting period generally can only be normally annotated at the scene, obstruction is just quite serious, even can't annotate poly-.
Its two because polymer solution corrosivity is stronger, the injection allocation device is difficult to realize normal pulling after corrosion.
Its three, adopt concentric single pipe layered tubing string to carry out layered polymer injection, the problem of its zonal testing never solves.Though can adopt the well flow meter to carry out zonal testing, error is too big, measured data cannot be used at all.This is because the viscosity of polymer solution and sewage is different on the one hand, is used in the flow meter of demarcating in the sewage and measures polymer solution, certainly will bring very big error; On the other hand, then be because adopt mother liquor and sewage mixed water injection technology, cause in the liquid polymer content inhomogeneous easily, and the flow rate test time is shorter relatively, the flow error liquid that the therefore different moment record are very big.
Its four, the present viscosity retention ratio data of single tube injection allocation device commonly used, the data of a laboratory experiment just, the scene cannot be checked.Though can realize well sampling, can only get the data of injection allocation device front end, have no idea at present to get through the viscosity data behind the injection allocation device.
Summary of the invention
Main purpose of the present invention promptly is to address the above problem, and determined the technical thought of ground shunting, metering and sampling for this reason, be the big latus rectum tubing string layering transferring polymer solution of pit shaft with concentric double pipe, the problem that is difficult for pulling after obstruction of solution single tube and the corrosion, use the metering of flow meter direct layering, Stratified Sampling on ground, measure flow and viscosity, flow and the unmeasurable problem of viscosity when having solved the single tube injection.
To achieve these goals, the present invention specifically adopts following technical scheme:
A kind of stratified injection tubular pile, comprise and carry the poly-oil pipe of the notes of annotating polymers, wherein, annotate poly-oil pipe outside the poly-pipe of described notes comprises and be built in this outer poly-oil pipe of the interior notes that gather in the oil pipe of annotating, with respectively in the poly-oil pipe of interior notes and the poly-oil pipe of interior notes and outer the notes between the poly-oil pipe form inner flow passage and the outside runner that leads to different oil reservoirs, control device is gathered and pumping plant links by annotating separately in the upper end of described inner flow passage and outside runner.Compared with prior art, owing to adopt dual channel to shunt, eliminated and used the obstruction that injection allocation device in down-hole brings and be difficult for problem such as pulling on ground.
As a further improvement on the present invention, described inner flow passage links by close plug in expansion loop and oil reservoir, described close plug in expansion loop comprises compensation sealing intubate, the plug stop of tubulose and the slipper seal plug that is provided with through hole, described slipper seal plug inserts in the described compensation sealing intubate and with this compensation sealing intubate and is tightly connected slidably, but described plug stop is connected with described compensation sealing intubate in the mode of limit slippage sealing plug downstream position.
As a further improvement on the present invention, described outside runner links by macropore screen casing and oil reservoir.
As a further improvement on the present invention, the poly-control device of described notes is low shear valve.
As a further improvement on the present invention, described inner flow passage links by little four-way in top and pumping plant, and described low shear valve promptly is arranged on the little four-way in described top.
As a further improvement on the present invention, the little four-way in described top is provided with the test valve.
As a further improvement on the present invention, described outside runner links by little four-way in bottom and pumping plant, and described low shear valve promptly is arranged on the little four-way in described bottom.
As a further improvement on the present invention, the little four-way in described bottom is provided with the test valve.
As a further improvement on the present invention, described interior the notes gathered oil pipe by interior pipe hanger suspension.
As a further improvement on the present invention, described stratified injection tubular pile also comprises the connection pipe nipple, fixedlys connected with the little four-way in top in described connection pipe nipple upper end, fixedlys connected with the little four-way in bottom in the lower end, and described interior pipe hanger is built in the described connection pipe nipple.
Owing to adopted technique scheme, compared with prior art, the present invention mainly can obtain following useful technique effect:
Adopt dual channel to shunt, eliminated single tube and annotated and poly-ly use the obstruction that down-hole injection allocation device brings and be difficult for problem such as pulling on ground;
Adopt the dual channel layering, the down-hole viscosity loss is little, and viscosity retention ratio is higher;
Low shear valve is adopted in the ground shunting, zonal flow rate can be adopted the current intelligence free adjustment according to notes, reduce the layering error, and can reduce to greatest extent to use that the common polymer shear degradations that other valve brought such as shutoff valve are serious, polymer solution by valve after the problem that significantly reduces of viscosity retention ratio;
The test valve is set on ground, but the layering continuous metering directly reads determination data, to survey data true and reliable.
The present invention is described further the present invention for the ease of more being expressly understood below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 annotates conflux journey schematic diagram for stratified injection tubular pile of the present invention;
Longitudinal sectional view when Fig. 2 is lowered in the oil well for stratified injection tubular pile of the present invention.
The specific embodiment
As depicted in figs. 1 and 2, stratified injection tubular pile of the present invention comprises the poly-oil pipe of the notes of transferring polymer solution, wherein, the poly-oil pipe of described notes further comprises to be annotated poly-oil pipe 15 and is built in this outer poly-oil pipe of annotating in the poly-oil pipe 15 16 of interior notes outward, with in the poly-oil pipe 16 of interior notes and the poly-oil pipe 16 of interior notes and the outer annular space that gathers between the oil pipe 15 of annotating form inner flow passage 25 and the outside runner 26 that leads to different oil reservoirs respectively.Compared with prior art, owing to adopt dual channel to shunt, eliminated and used the obstruction that injection allocation device in down-hole brings and be difficult for problem such as pulling on ground.
The lower end of described inner flow passage 25 is annotated poly-oil reservoir 21 by close plug in expansion loop and bottom and is linked.This close plug in expansion loop comprises compensation sealing intubate 22, plug stop 23 and slipper seal plug 20.Compensation sealing intubate 22 is a tubular structure, inwall chromium plating and grinding and polishing; Slipper seal plug 20 also is a tubular structure, in establish central through hole 201, the outer wall grinding and polishing can insert in the compensation sealing intubate 22, is tightly connected slidably with this compensation sealing intubate 22.After the interior polymer solution of annotating in the poly-oil pipe 16 can only enter the centre bore of compensation sealing intubate 22 bottom remainders by the central through hole 201 of slipper seal plug 20, the plug stop 23 of flowing through again enters the lower layer space behind packer 19 parting seals, annotates poly-oil reservoir 21 after the oil jacket annular space enters the bottom.Described plug stop 23 is fixedly connected on the box of described compensation sealing intubate 22 bottoms by the pin thread on its top, its diameter is slightly less than slipper seal plug 20, be used for the descending position of limit slippage sealing plug 20, prevent that slipper seal plug 20 from skidding off compensation sealing intubate 22 downwards.This close plug in expansion loop is an instrument of realizing layering, its what is called " compensation " refers to length compensation, refer to that promptly slipper seal plug 20 enters optional position, compensation sealing intubate 22 back and can seal, annotating the length adjustment of poly-oil pipe 16 like this uses the oil pipe adjusting just can solve, do not need to use too much connection pipe nipple to regulate, made things convenient for construction.In other words, using close plug in expansion loop is in order to use the connection pipe nipple to regulate poly-oil pipe 16 length of interior notes slipper seal plug 20 is entered in the compensation sealing intubate 22, and the runner of oil reservoir separately about making.
The lower end of described outside runner 26 is annotated poly-oil reservoir 17 by macropore screen casing 18 and top and is linked.Owing to adopt macropore screen casing 18, it is big that polymer solution flows into the inflow area of annotating when gathering oil reservoir 17 on top, low to the shearing of polymer solution with respect to aperture road screen casing, and the shear degradation of polymer is very small during therefore by macropore screen casing 18.Preferably, diameter 〉=20 of the screen casing eyelet on the macropore screen casing 18 millimeter.At this moment, polymer solution is by shear degradation＜10% of macropore screen casing 18 front and back.Different with the notes orchestration of available technology adopting down-hole control polymer solution flow, macropore screen casing 18 is not controlled the flow of polymer solution among the present invention, is to control by the described low shear valve 8 that is arranged at ground to the control of polymer solution flow.
Stratified injection tubular pile of the present invention also comprises the little four-way 2 in top, the little four-way 7 in bottom, interior pipe hanger 5 and connects pipe nipple 6.Wherein:
The inner flow passage of annotating in being formed in the poly-oil pipe 16 25 extends to link with interior Guan Laiju pipeline 4 from pumping plant by the little four-way 2 in top, the little four-way 2 in this top is provided with low shear valve 3, with the flow of Guan Laiju pipeline in controlling 4 to the polymer solution of inner flow passage 25.On the little four-way 2 in this top, also be provided with the test valve 1 that is used for achievement datas such as tested viscosity.
Annotating poly-oil pipe 16 and the outer outside runner 26 of annotating the annular space place between the poly-oil pipe 15 in being formed at gathers pipeline 9 by little four-way 7 in bottom and outer tube from pumping plant and links, described low shear valve 8 promptly is arranged on the little four-way 7 in this bottom, with the flow of Guan Laiju pipeline in controlling 9 to the polymer solution of outside runner 26.On the little four-way 7 in this bottom, also be provided with the test valve 27 that is used for achievement datas such as tested viscosity.
Owing to all adopt low shear valve in the flow-control link, therefore less to the shearing of polymer, very high by the viscosity of polymer solution after the low shear valve, viscosity retention ratio is higher, generally can maintain the level greater than 85%.Use its viscosity retention ratio of common shutoff valve then to be generally less than 60%.
Described connection pipe nipple 6 is between the little four-way 7 of little four-way 2 in top and bottom.There is the clip head upper end of this connection pipe nipple 6, and this clip head is fixedlyed connected by the bottom of the little four-way 2 in clip and top, and the bottom that connects pipe nipple 6 is fixedly connected on the set clip head in little four-way 7 tops, bottom by clip.Interior pipe hanger 5 is built in and connects in the pipe nipple 6, annotates poly-oil pipe 16 in being used to hang.
More clear and intactly describe the present invention below in conjunction with installation of the present invention and production operation flow process.
As shown in Figure 2, at first the pin thread with plug stop 23 tops is connected on the box of compensation sealing intubate 22 bottoms, then with plug stop 23 together with compensation sealing intubate 22 G.I.Hs.Then will be used for the packing desired location of packer 19 lower going-into-wells of injection region section (being that poly-oil reservoir 17 is annotated on packing top and poly-oil reservoir 21 is annotated in the bottom) up and down, and make packer 19 be connected with the top box of compensation sealing intubate 22 by the pin thread of its bottom.
Next, be lowered to macropore screen casing 18, to annotate the continuous projected depth that is lowered into of 15 1 one in poly-oil pipe then outward, pin thread with outer pipe hanger 5 bottoms is connected on the box of the poly-oil pipe 15 of outer notes that has been lowered to again, on carry certain altitude, the imprisonment packer 19 of transferring and pressurize makes " 0 " shape rubber tube on the packer 19 expand on the production string on 14.Like this packer 19 just with on the production string about in the of 14 the space be divided into two sections.
Afterwards, well head upper flange 10 usefulness well head screw threads are screwed together in the top of well head big four 12, with clip the little four-way 7 in bottom is fixed on the clip head that well head upper flange 10 tops are provided with again, will connects on the clip head that pipe nipple 6 is fixed on the setting of little four-way 7 tops, bottom with clip again.
Again next, the box that slipper seal plug 20 tops are provided with is threaded on the bottom pin thread of annotating poly-oil pipe 16 in first, along connecting pipe nipple 6, the little four-way 7 in bottom, well head upper flange 10, outer pipe hanger 5, the outer axle center mesopore of annotating poly-oil pipe 15 and packer 19 is inserted into slipper seal plug 20 in compensation sealing intubate 22 vestibules, the back G.I.H that is threaded that passes through with 16 1 one in the poly-oil pipe of interior notes, transfer visit plug stop 23 after, trip out Mo Gennei and annotate the unnecessary part of poly-oil pipe 16, the pin thread of interior pipe hanger 5 bottoms is connected on the box of annotating poly-oil pipe 16 tops in last root, the pin thread that outer, interior pipe hanger 5 bottom is provided with is connected on the box that connects the setting of pipe nipple 6 upper ends again, the little four-way 2 in top is fixed on the clip head that connects the setting of pipe nipple 6 upper ends with clip then, with clip test strobe 1 is fixed on little four-way 2 tops, top at last, to hang down the side that shear valve 3 is fixed on the little four-way 2 in top with clip, and interior Guan Laiju pipeline 4 of welding and the little four-way 2 in top, with clip outer tube is annotated the side that poly-regulating gate 8 is fixed on the little four-way 7 in bottom, and weld outer tube and gather pipeline 9 and the little four-way 7 in bottom, at last interior Guan Laiju pipeline 4 and outer tube are gathered pipeline 9 and be connected with total pipeline of pumping plant.
After assembling is finished, from total pipeline connect the polymer that transports just can after shunting, enter respectively in Guan Laiju pipeline 4 and outer tube gather pipeline 9.Wherein, polymer solution that interior Guan Laiju pipeline 4 provides controls to the flow of design after enter the centre bore of compensation sealing intubate 22 bottom remainders by the little four-way 2 in top, interior pipe hanger 5, the central through hole 201 that connects pipe nipple 6, the poly-oil pipe 16 of interior notes, slipper seal plug 20 through low shear valve 3, reinject lower layer space behind packer 19 parting seals is annotated poly-oil reservoir 21 after the oil jacket annular space enters the bottom.Because the internal diameter of the little four-way 2 in top that polymer solution is flowed through, interior pipe hanger 5, connection pipe nipple 6, the poly-oil pipe 16 of interior notes, slipper seal plug 20, compensation sealing intubate 22 and plug stop 23 is all bigger, diameter approximately equal up and down, the place that does not have throttling and sudden change, therefore can not result in blockage, can not cause serious the separating of polymer to be cut yet.Outer tube gather polymer solution that pipeline 9 provides through low shear valve 8 control to design flow after the poly-oil pipe 16 of interior notes and the little four-way 7 in bottom, outer pipe hanger 11, the outer hole of annotating annular space between the poly-oil pipe 15 and macropore screen casing 18 after the oil jacket annular space injects top annotates and gather oil reservoir 17.Since the annular space between the poly-oil pipe 15 of poly-oil pipe 16 of interior notes and outer notes probably than the circulation area of the poly-oil pipe 16 of interior notes big 1 times also many, so can not result in blockage yet.
Adopt stratified injection tubular pile of the present invention, can improve the etch-proof ability of tubing string and reduce iron concentration in the polymer solution, whole notes collecting process is lower to the shearing of polymer solution, improved the viscosity retention ratio of polymer greatly, effectively realize hierarchical control, improved and annotated the poly-interval qualification rate of polymers solution notes, thereby improved the oil displacement efficiency of polymer injection liquid.
Claims (10)
1, a kind of stratified injection tubular pile, comprise and carry the poly-oil pipe of the notes of annotating polymers, it is characterized in that, annotate poly-oil pipe outside the poly-oil pipe of described notes comprises and be built in this outer poly-oil pipe of the interior notes that gather in the oil pipe of annotating, with in the poly-oil pipe of interior notes and the poly-oil pipe of interior notes and outer the notes form inner flow passage and the outside runner that leads to different oil reservoirs between the poly-oil pipe respectively, control device is gathered and pumping plant links by annotating separately in the upper end of described inner flow passage and outside runner.
2, stratified injection tubular pile as claimed in claim 1, wherein, described inner flow passage links by close plug in expansion loop and oil reservoir, described close plug in expansion loop comprises compensation sealing intubate, the plug stop of tubulose and the slipper seal plug that is provided with through hole, described slipper seal plug inserts in the described compensation sealing intubate and with this compensation sealing intubate and is tightly connected slidably, but described plug stop is connected with described compensation sealing intubate in the mode of limit slippage sealing plug downstream position.
3, stratified injection tubular pile as claimed in claim 2, wherein, described outside runner links by macropore screen casing and oil reservoir.
4, stratified injection tubular pile as claimed in claim 3, wherein, the poly-control device of described notes is low shear valve.
5, stratified injection tubular pile as claimed in claim 4, wherein, described inner flow passage links by little four-way in top and pumping plant, and described low shear valve promptly is arranged on the little four-way in described top.
6, stratified injection tubular pile as claimed in claim 5, wherein, the little four-way in described top is provided with the test valve.
7, stratified injection tubular pile as claimed in claim 6, wherein, described outside runner links by little four-way in bottom and pumping plant, and described low shear valve promptly is arranged on the little four-way in described bottom.
8, stratified injection tubular pile as claimed in claim 7, wherein, the little four-way in described bottom is provided with the test valve.
9, as the described stratified injection tubular pile of any one claim among the claim 1-8, wherein, described interior the notes gathered oil pipe by interior pipe hanger suspension.
10, stratified injection tubular pile as claimed in claim 9, wherein, described stratified injection tubular pile also comprises the connection pipe nipple, fixedlys connected with the little four-way in top in described connection pipe nipple upper end, fixedly connected with the little four-way in bottom in the lower end, described interior pipe hanger is built in the described connection pipe nipple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101303340A CN101074602B (en) | 2007-07-18 | 2007-07-18 | Stratified injection tubular pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101303340A CN101074602B (en) | 2007-07-18 | 2007-07-18 | Stratified injection tubular pile |
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| Publication Number | Publication Date |
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| CN101074602A true CN101074602A (en) | 2007-11-21 |
| CN101074602B CN101074602B (en) | 2010-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101303340A Expired - Fee Related CN101074602B (en) | 2007-07-18 | 2007-07-18 | Stratified injection tubular pile |
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| CN (1) | CN101074602B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337873A (en) * | 2011-09-01 | 2012-02-01 | 中国石油天然气股份有限公司 | Multi-channel separate injection tubular column of oil tube for polymers |
| CN105201473A (en) * | 2015-10-22 | 2015-12-30 | 东北石油大学 | Multiple-oil-layer deep profile control injection device and oil layer deep profile control realizing method thereof |
| CN111441752A (en) * | 2020-04-15 | 2020-07-24 | 王皓 | Multilayer polymer injection well washing method for coiled tubing |
| CN111441751A (en) * | 2020-04-15 | 2020-07-24 | 王皓 | Coiled tubing multilayer is annotated and is gathered integrative device of well-flushing |
| CN114482943A (en) * | 2020-10-27 | 2022-05-13 | 中国石油化工股份有限公司 | Layered polymer injection pipe column for layered sand control well and use method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87101671A (en) * | 1987-03-06 | 1988-09-14 | 新疆石油管理局油田工艺研究所 | Concentric double pipe stratified injection water technology |
| US5911278A (en) * | 1997-06-20 | 1999-06-15 | Reitz; Donald D. | Calliope oil production system |
| CN2625575Y (en) * | 2003-06-04 | 2004-07-14 | 中国海洋石油总公司 | Stratified waterflooding apparatus for gravel sand prevention water injection well of offshore oil field |
| CN2737941Y (en) * | 2004-10-14 | 2005-11-02 | 中国石化胜利油田有限公司采油工艺研究院 | Concentric tube separated layer gas injection tube column |
| CN2846910Y (en) * | 2005-06-10 | 2006-12-13 | 刘万康 | Flow regulator of micro shear liquid |
| CN2893141Y (en) * | 2005-10-08 | 2007-04-25 | 中国石化胜利油田有限公司桩西采油厂 | Spigot type hollow integrated separated layer water-flooding process pipe column |
| CN100343480C (en) * | 2005-12-24 | 2007-10-17 | 中国石化胜利油田有限公司采油工艺研究院 | Separate layer gas injection tube pile |
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2007
- 2007-07-18 CN CN2007101303340A patent/CN101074602B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337873A (en) * | 2011-09-01 | 2012-02-01 | 中国石油天然气股份有限公司 | Multi-channel separate injection tubular column of oil tube for polymers |
| CN102337873B (en) * | 2011-09-01 | 2014-09-17 | 中国石油天然气股份有限公司 | Multi-channel separate injection tubular column of oil tube for polymers |
| CN105201473A (en) * | 2015-10-22 | 2015-12-30 | 东北石油大学 | Multiple-oil-layer deep profile control injection device and oil layer deep profile control realizing method thereof |
| CN111441752A (en) * | 2020-04-15 | 2020-07-24 | 王皓 | Multilayer polymer injection well washing method for coiled tubing |
| CN111441751A (en) * | 2020-04-15 | 2020-07-24 | 王皓 | Coiled tubing multilayer is annotated and is gathered integrative device of well-flushing |
| CN111441752B (en) * | 2020-04-15 | 2021-12-10 | 江苏瑞亿石油机械有限公司 | Multilayer polymer injection well washing method for coiled tubing |
| CN111441751B (en) * | 2020-04-15 | 2022-01-25 | 王皓 | Coiled tubing multilayer is annotated and is gathered integrative device of well-flushing |
| CN114482943A (en) * | 2020-10-27 | 2022-05-13 | 中国石油化工股份有限公司 | Layered polymer injection pipe column for layered sand control well and use method |
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Inventor after: Zhang Guorong Inventor after: Liu Yang Inventor after: Zheng Weilin Inventor after: Gu Yongtao Inventor after: Shang Xiangyi Inventor after: Chang Fangrui Inventor after: Huang Chun Inventor after: Peng Shoubin Inventor before: Zhang Guorong Inventor before: Liu Yang Inventor before: Gu Yongtao Inventor before: Shang Xiangyi Inventor before: Chang Fangrui Inventor before: Huang Chun Inventor before: Peng Shoubin |
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Free format text: CORRECT: INVENTOR; FROM: ZHANG GUORONG LIU YANG GU YONGTAO SHANG XIANGYI CHANG FANGRUI HUANG CHUN PENG SHOUBIN TO: ZHANG GUORONG LIU YANG ZHENG WEILIN GU YONGTAO SHANG XIANGYI CHANG FANGRUI HUANG CHUN PENG SHOUBIN |
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Granted publication date: 20101013 Termination date: 20110718 |