CN204457708U - Ball-throwing selective injection process pipe column - Google Patents
Ball-throwing selective injection process pipe column Download PDFInfo
- Publication number
- CN204457708U CN204457708U CN201420868135.5U CN201420868135U CN204457708U CN 204457708 U CN204457708 U CN 204457708U CN 201420868135 U CN201420868135 U CN 201420868135U CN 204457708 U CN204457708 U CN 204457708U
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- Prior art keywords
- ball
- pitching
- process pipe
- pipe string
- hole
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- 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.)
- Expired - Fee Related
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000002347 injection Methods 0.000 title claims abstract description 22
- 239000007924 injection Substances 0.000 title claims abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 230000004308 accommodation Effects 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 13
- 239000010959 steel Substances 0.000 abstract description 13
- 238000010793 Steam injection (oil industry) Methods 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000003129 oil well Substances 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 2
- 239000003921 oil Substances 0.000 description 12
- 238000007790 scraping Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The utility model provides a throw ball selection and annotate technology tubular column, include gas injection tubular column (4), sidetracking ball thrower (1) and sidetracking ball receiver (2) that from the top down connected gradually, sidetracking ball thrower (1) includes top connection (11), dress ball ware (12) and lower clutch (13) that from the top down connected gradually, contains shutoff ball (3) in dress ball ware (12), contains in dress ball ware (12) and is used for preventing lower baffle (16) of shutoff ball (3) downstream, contains in lower clutch (13) and is used for guiding shutoff ball (3) to this director (14) that throws the ball passageway and remove. The pitching selective injection process pipe column solves the problems of separate injection and selective injection of the small-bore casing oil well. The ball injector adopts the steel structure to do benefit to assembly and transportation, through implementing the utility model discloses technology can make the steam injection volume of high permeable formation and well low permeable formation realize rational distribution. The bottom of the ball collector is designed with a conical guide to make the construction more convenient.
Description
Technical field
The utility model relates to oil exploration equipment technical field, specifically a kind of pitching choosing note process pipe string.
Background technology
In recent years along with heavy oil block steam soak production development progresses into the middle and later periods, hole condition condition worse and worse, in order to implement low cost strategy, improves old well production, power of taping the latent power, and casing sidetracking, perforations adding and sidetracked hole increase year by year.Due to 51/2 cased hole completion that this part oil well all adopts diameter less, at present for heavy crude heat extraction separated zone injection technology, the selective steam injection of this type of oil well all can not be adapted to very well.Therefore study that a kind of to adapt to the horizontal well of minor diameter sleeve pipe, the special tool of the selective steam injection of sidetracked hole and technique imperative.
Utility model content
Be not suitable for the problem of old well reform to solve existing pitching gas injection equipment, the utility model provides a kind of pitching choosing note process pipe string.This pitching choosing note process pipe string solves dispensing, the choosing note difficult problem of small-bore sleeve pipe oil well.Ball injector adopts steel design to be beneficial to assembling and transport, the steam injection amount of high permeability zone and middle less permeable layer can be made to realize reasonable distribution by implementing the utility model technique.The tapered guiding of ball collecting device bottom design makes construction easier.
The utility model solves the technical scheme that its technical problem adopts: a kind of pitching choosing note process pipe string, comprise the gas injection tube column connected successively from the top down, sidetracked hole ball injector and sidetracked hole ball collecting device, this sidetracked hole ball injector comprises the top connection of the tubular connected successively from the top down, the ball feeder of tubular and the lower contact of tubular, containing ball sealer in ball feeder, ball feeder includes the lower baffle plate for preventing ball sealer from moving down, lower baffle plate can melt, between lower baffle plate and the lower end of lower contact, the sidewall of lower contact is provided with the pitching passage that passes for ball sealer and lower contact includes for guiding ball sealer to the guider of this pitching passage movement.
Ball feeder is screen casing, and the upper end of ball feeder is threaded with top connection, and the lower end of ball feeder is threaded with lower contact.
Also be provided with in described sidetracked hole ball injector for preventing ball sealer from moving up and leaving the upper vent baffle of sidetracked hole ball injector, upper vent baffle is distributed with multiple through hole, and upper vent baffle is fixed on the upper end of ball feeder.
Lower baffle plate is fixed on the lower end of ball feeder, and lower baffle plate is plastic dam, lower baffle plate is distributed with multiple through hole, and the melt temperature of lower baffle plate is 250 DEG C ~ 300 DEG C.
Lower contact comprises the large footpath section, taper reducer and the path section that set gradually from the top down, and the lower end of ball feeder is threaded with large footpath section, and this pitching passage is arrange the through hole on taper reducer.
Guider is conically shaped, and the top of guider abuts with lower baffle plate, and the bottom of guider is fixed in path section, and the sidewall of guider is provided with multiple strip through-hole.
A kind of sidetracked hole ball collecting device, comprise connect successively from the top down box cupling, screen casing, scrape ball device and ball collecting chamber, scrape ball device and contain column, the upper end of column is fixedly connected with the lower end of screen casing, be arranged with annulus outside column, annulus is provided with the axially extending bore passed for ball sealer, and annulus is fixed in the upper end of ball collecting chamber, ball collecting chamber is provided with the accommodation cavity for holding ball sealer, the lower end closed of ball collecting chamber.
Box cupling is cylindrical shape, and the lower end of box cupling is connected with the threaded upper ends of screen casing.
Column comprises the large footpath section, interlude and the path section that set gradually from the top down, and the lower end of screen casing is threaded with large footpath section, and annulus is set in outside path section.
Ball collecting chamber is conically shaped, and down, the wallboard of this conically shaped is distributed with multiple strip through-hole on top upward for the bottom of this conically shaped.
The bottom lock end scraping ball device and ball collecting chamber is connected and fixed by screw rod and nut.
The beneficial effects of the utility model are, this pitching choosing note process pipe string solves dispensing, the choosing note difficult problem of small-bore sleeve pipe oil well.Ball injector adopts steel design to be beneficial to assembling and transport, the steam injection amount of high permeability zone and middle less permeable layer can be made to realize reasonable distribution by implementing the utility model technique.The tapered guiding of ball collecting device bottom design makes construction easier.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Fig. 1 is the front view of ball injector described in the utility model.
Fig. 2 is ball injector sectional view described in the utility model.
Fig. 3 is screen construction figure.
Fig. 4 is the structure chart of pitching lower contact.
Fig. 5 is the structure chart of conical guider.
Fig. 6 is the structure chart of ball collecting device described in the utility model.
Fig. 7 is the sectional view of ball collecting device described in the utility model.
Fig. 8 is the structure chart scraping ball device.
Fig. 9 is the structure chart of ball collecting chamber.
Figure 10 is the schematic diagram of pitching choosing note process pipe string
Wherein 1. sidetracked hole ball injectors, 11. top connections, 12. ball feeders, 13. lower contacts, 131. large footpath sections, 132. taper reducers, 133. path sections, 134. pitching passages, 14. guiders, vent baffle on 15., 16. lower baffle plates;
2. sidetracked hole ball injector, 21. box cuplings, 22. screen casings, 23. scrape ball device, 231. columns, 232. annulus, 233. axially extending bores, 234. large footpath sections, 235. interludes, 236. path sections, 24. ball collecting chambers, 25. screw rods, 26. nuts;
3. ball sealer, 4. gas injection tube column, 5. down-hole casing, 6. oil reservoir.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
A kind of pitching choosing note process pipe string, comprises the gas injection tube column 4, sidetracked hole ball injector 1 and the sidetracked hole ball collecting device 2 that connect successively from the top down, as shown in Figure 10.
Wherein, sidetracked hole ball injector 1, comprise the top connection 11 of the tubular connected successively from the top down, the ball feeder 12 of tubular and the lower contact 13 of tubular, containing ball sealer 3 in ball feeder 12, ball feeder 12 includes the lower baffle plate 16 for preventing ball sealer 3 from moving down, lower baffle plate 16 can melt, between lower baffle plate 16 and the lower end of lower contact 13, the sidewall of lower contact 13 is provided with the pitching passage passed for ball sealer 3, between lower baffle plate 16 and the lower end of lower contact 13, lower contact 13 includes for guiding ball sealer 3 to the guider 14 of this pitching passage movement, as shown in Figures 1 to 5.
Ball feeder 12 is screen casing, and the upper end of ball feeder 12 is threaded with top connection 11, and the lower end of ball feeder 12 is threaded with lower contact 13.Also be provided with for preventing ball sealer 3 from moving up and leaving the upper vent baffle 15 of sidetracked hole ball injector 1 in described sidetracked hole ball injector 1, upper vent baffle 15 is distributed with multiple through hole, upper vent baffle 15 is fixed on the upper end of ball feeder 12, as shown in Figure 1 to Figure 3.Lower baffle plate 16 is fixed on the lower end of ball feeder 12, and lower baffle plate 16 is plastic dam, and lower baffle plate 16 is distributed with multiple through hole, and the melt temperature of lower baffle plate 16 is 250 DEG C ~ 300 DEG C.
Lower contact 13 comprises the large footpath section 131, taper reducer 132 and the path section 133 that set gradually from the top down, and the lower end of ball feeder 12 is threaded with large footpath section 131, and this pitching passage 134 is for arranging the through hole on taper reducer 132.Guider 14 is conically shaped, and the top of guider 14 abuts with lower baffle plate 16, and the bottom of guider 14 is fixed in path section 133, and the sidewall of guider 14 is provided with multiple strip through-hole, as shown in Figure 4 and Figure 5.
Further, top connection 11 and ball feeder 12 top screwed connection; The bottom screwed connection of lower contact 13 (ball injection joint) and ball feeder 12.As shown in Figure 2, top connection 11 inside be welded with prevent ball sealer 3 in steam injection process on vent baffle 15 on the steel of altering, upper vent baffle 15 arranges multiple circular hole oil flow channel is provided; Ball feeder 12 is the 31/2 steam injection screen casing of long 1500mm, the ball sealer 3 of the hollow steel of high strength of inner prepackage design quantity, the two ends of ball feeder 12 are pin thread, lower contact 13 top is 31/2 box, bottom is 23/8 pin thread structure, the inner fastening lower baffle plate 16 (thickness 5mm) ventilation polytetrafluoroethylplastic plastic being housed and making, tapered guider 14 and lower baffle plate 16 all arranges circular hole and provides oil flow channel.In steam injection process, the lower baffle plate 16 that polytetrafluoroethylplastic plastic is made starts fusing in 250 DEG C ~ 300 DEG C, high strength hollow steel ball (ball sealer 3) one by one, in order invests oil layer section to 23/8 pin thread reducing crossover position (taper reducer 132) via 4 pitching passages 134 around the guider 14 of taper and taper reducer 132 by 31/2 box in bottom, realizes block up design layer position.
Further, as shown in Figure 3, ball feeder 12 is the 31/2 steam injection screen casing of long 1500mm, this screen casing kind is griddle pipe, according to optimum results, as shown in Figure 10, because sidetracked hole or horizontal well eccentric wear can occur with sleeve pipe 5 when lower gas injection tube column 4, can not be scratched when selecting screen casing can ensure that overall gas injection tube column enters sidetracked hole or horizontal well for 4 times as ball feeder 12.
Further, as shown in Figure 4, the reducing place of lower contact 13 is disposed radially four oval ducts as pitching passage.
Further, as shown in Figure 5, be provided with gap around the guider 14 of taper, oily stream can flow through from gap.
A kind of sidetracked hole ball collecting device 2, comprise connect successively from the top down box cupling 21, screen casing 22, scrape ball device 23 and ball collecting chamber 24, scrape ball device 23 containing column 231, the upper end of column 231 is fixedly connected with the lower end of screen casing 22, annulus 232 is arranged with outside column 231, annulus 232 is provided with the axially extending bore 233 passed for ball sealer 3, annulus 232 is fixed in the upper end of ball collecting chamber 24, ball collecting chamber 24 is provided with the accommodation cavity for holding ball sealer 3, the lower end closed of ball collecting chamber 24, as shown in Figures 6 to 9.
Box cupling 21 is cylindrical shape, and the lower end of box cupling 21 is connected with the threaded upper ends of screen casing 22.Column 231 comprises the large footpath section 234, interlude 235 and the path section 236 that set gradually from the top down, and the lower end of screen casing 22 is threaded with large footpath section 234, and annulus 232 is set in outside path section 236.Ball collecting chamber 24 is conically shaped, and down, the wallboard of this conically shaped is distributed with multiple strip through-hole on top upward for the bottom of this conically shaped.
Further, box cupling 21 is 23/8 box box cupling, box cupling 21 and steam injection screen casing 22 screwed connection, scraping ball device 23 maximum outside diameter (external diameter of annulus 232) is φ 90mm, and in the shape of falling horn mouth, scrape ball device 23 lower end to weld with ball collecting chamber 24 upper end, namely the edge of annulus 232 welds with ball collecting chamber 24 upper end, meanwhile, as shown in Figure 7, scrape ball device 23 to be connected with nut 26 by screw rod 25 with ball collecting chamber 24 axle center place, play further fixation.
Further, as shown in Figure 8, the maximum outside diameter place of scraping ball device 23 has been disposed radially 4 ducts (axially extending bore 233), this channel diameter is greater than the diameter of steel ball sealer 3, when carrying out the operation of receipts ball, steel ball sealer 3 enters in ball collecting chamber 24 by the axially extending bore 233 scraping ball device 23;
Further, as shown in Figure 9, ball collecting chamber 24 is steel tapered cylinder, and barrel arranges several slotted eye and provides emptying duct, is steep-taper guide frame bottom ball collecting chamber 24.
A kind of pitching choosing note process pipe string, comprises the gas injection tube column 4 connected successively from the top down, above-mentioned sidetracked hole ball injector 1 and above-mentioned sidetracked hole ball collecting device 2, as shown in Figure 10.Simultaneously gas injection tube column 4 by 23/8 common oil pipe and 23/8 screen casing as main tubing string carrier.When carrying out process operation, by whole gas injection tube column 4 times to down-hole casing 5 until oil reservoir 6 position, wherein screen casing 22 is down to the medium position of steam injection oil layer section 6, and ball injector 1 is down to oil reservoir 6 upper bound 3m ~ 5m; Ball collecting device 2 is down to oil reservoir lower bound 3m ~ 5m.After starting gas injection, the lower baffle plate 13 of plastics at high temperature melts, the ball sealer 13 of steel tumbles oil reservoir position through the pitching passage 134 of guiding device 14 and lower contact 13, afterwards, the ball sealer 13 of steel is under the effect of high steam, the perforation eye of shutoff target oil reservoir 6, thus realize the object of selective gas injection.
Further, after gas injection operation completes, regained by the ball sealer 3 of ball collecting device 2 by steel, now, the ball sealer 3 of steel enters the accommodation cavity in ball collecting chamber 24 by the tapering trumpet-like passage (i.e. axially extending bore 233) scraping ball device 23, trip out gas injection tube column 4 and namely complete the selective gas injection technology flow process of whole pitching.
The above, be only specific embodiments of the invention, can not limit the scope that invention implements with it, so the displacement of its equivalent assemblies, or the equivalent variations done according to scope of patent protection of the present invention and modification, all still should belong to the category that this patent is contained.In addition, the technical characteristic in the present invention and all can using by independent assortment between technical characteristic, between technical characteristic and technical scheme, between technical scheme and technical scheme.
Claims (11)
1. a pitching choosing note process pipe string, it is characterized in that, this pitching choosing note process pipe string comprises the gas injection tube column (4) connected successively from the top down, sidetracked hole ball injector (1) and sidetracked hole ball collecting device (2), described sidetracked hole ball injector (1) comprises the top connection (11) of the tubular connected successively from the top down, the ball feeder (12) of tubular and the lower contact (13) of tubular, containing ball sealer (3) in ball feeder (12), ball feeder (12) includes the lower baffle plate (16) for preventing ball sealer (3) from moving down, lower baffle plate (16) can melt, between lower baffle plate (16) and the lower end of lower contact (13), the sidewall of lower contact (13) is provided with the pitching passage that passes for ball sealer (3) and lower contact (13) includes for guiding ball sealer (3) to the guider (14) of this pitching passage movement.
2. pitching choosing note process pipe string according to claim 1, it is characterized in that, ball feeder (12) is screen casing, the upper end of ball feeder (12) is threaded with top connection (11), and the lower end of ball feeder (12) is threaded with lower contact (13).
3. pitching choosing note process pipe string according to claim 1, it is characterized in that, also be provided with for preventing ball sealer (3) from moving up and leaving the upper vent baffle (15) of sidetracked hole ball injector (1) in described sidetracked hole ball injector (1), (15) are distributed with multiple through hole to upper vent baffle, and upper vent baffle (15) is fixed on the upper end of ball feeder (12).
4. pitching choosing note process pipe string according to claim 1, it is characterized in that, lower baffle plate (16) is fixed on the lower end of ball feeder (12), lower baffle plate (16) is plastic dam, (16) are distributed with multiple through hole to lower baffle plate, and the melt temperature of lower baffle plate (16) is 250 DEG C ~ 300 DEG C.
5. pitching choosing note process pipe string according to claim 4, it is characterized in that, lower contact (13) comprise set gradually from the top down large footpath section (131), taper reducer (132) and path section (133), the lower end of ball feeder (12) is threaded with large footpath section (131), and this pitching passage is for arranging the through hole on taper reducer (132).
6. pitching choosing note process pipe string according to claim 5, it is characterized in that, guider (14) is conically shaped, the top of guider (14) abuts with lower baffle plate (16), the bottom of guider (14) is fixed in path section (133), and the sidewall of guider (14) is provided with multiple strip through-hole.
7. pitching choosing note process pipe string according to claim 1, it is characterized in that, described sidetracked hole ball collecting device (2) comprises the box cupling (21) connected successively from the top down, screen casing (22), scrape ball device (23) and ball collecting chamber (24), scrape ball device (23) containing column (231), the upper end of column (231) is fixedly connected with the lower end of screen casing (22), annulus (232) is arranged with outside column (231), annulus (232) is provided with the axially extending bore (233) passed for ball sealer (3), annulus (232) is fixed in the upper end of ball collecting chamber (24), ball collecting chamber (24) is provided with the accommodation cavity for holding ball sealer (3), the lower end closed of ball collecting chamber (24).
8. pitching choosing note process pipe string according to claim 7, it is characterized in that, box cupling (21) is cylindrical shape, and the lower end of box cupling (21) is connected with the threaded upper ends of screen casing (22).
9. pitching choosing note process pipe string according to claim 7, it is characterized in that, column (231) comprise set gradually from the top down large footpath section (234), interlude (235) and path section (236), the lower end of screen casing (22) is threaded with large footpath section (234), and annulus (232) is set in path section (236) outward.
10. pitching according to claim 7 choosing note process pipe string, it is characterized in that, ball collecting chamber (24) is conically shaped, and down, the wallboard of this conically shaped is distributed with multiple strip through-hole on top upward for the bottom of this conically shaped.
11. pitching choosing note process pipe strings according to claim 7, be is characterized in that, scrape ball device (23) and be connected and fixed by screw rod (25) and nut (26) with the bottom lock end of ball collecting chamber (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420868135.5U CN204457708U (en) | 2014-12-31 | 2014-12-31 | Ball-throwing selective injection process pipe column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420868135.5U CN204457708U (en) | 2014-12-31 | 2014-12-31 | Ball-throwing selective injection process pipe column |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204457708U true CN204457708U (en) | 2015-07-08 |
Family
ID=53664610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420868135.5U Expired - Fee Related CN204457708U (en) | 2014-12-31 | 2014-12-31 | Ball-throwing selective injection process pipe column |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204457708U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109113617A (en) * | 2018-07-18 | 2019-01-01 | 中国石油天然气股份有限公司 | Temporary blocking ball collecting device and using method thereof |
| CN110374547A (en) * | 2019-06-12 | 2019-10-25 | 中国石油化工股份有限公司 | A kind of ball injector and the Thickened oil injection-production integrated pipe column using the ball injector |
| CN110905471A (en) * | 2019-12-20 | 2020-03-24 | 沈阳航空航天大学 | Ball-throwing injection selection simulation device for drilling heavy oil thermal recovery and use method thereof |
| CN111663928A (en) * | 2020-05-26 | 2020-09-15 | 中国石油化工股份有限公司 | Ball-throwing and injection-selecting method and ball-throwing and injection-selecting pipe column system |
| CN111677488A (en) * | 2020-05-26 | 2020-09-18 | 中国石油化工股份有限公司 | Ball throwing and selecting injection pipe column and ball throwing device |
| CN115704316A (en) * | 2021-08-12 | 2023-02-17 | 中国石油化工股份有限公司 | Throwing rod type pipe inspection device and application thereof |
-
2014
- 2014-12-31 CN CN201420868135.5U patent/CN204457708U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109113617A (en) * | 2018-07-18 | 2019-01-01 | 中国石油天然气股份有限公司 | Temporary blocking ball collecting device and using method thereof |
| CN109113617B (en) * | 2018-07-18 | 2020-09-08 | 中国石油天然气股份有限公司 | Temporary plugging ball collecting device and using method thereof |
| CN110374547A (en) * | 2019-06-12 | 2019-10-25 | 中国石油化工股份有限公司 | A kind of ball injector and the Thickened oil injection-production integrated pipe column using the ball injector |
| CN110905471A (en) * | 2019-12-20 | 2020-03-24 | 沈阳航空航天大学 | Ball-throwing injection selection simulation device for drilling heavy oil thermal recovery and use method thereof |
| CN111663928A (en) * | 2020-05-26 | 2020-09-15 | 中国石油化工股份有限公司 | Ball-throwing and injection-selecting method and ball-throwing and injection-selecting pipe column system |
| CN111677488A (en) * | 2020-05-26 | 2020-09-18 | 中国石油化工股份有限公司 | Ball throwing and selecting injection pipe column and ball throwing device |
| CN115704316A (en) * | 2021-08-12 | 2023-02-17 | 中国石油化工股份有限公司 | Throwing rod type pipe inspection device and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 |
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| CF01 | Termination of patent right due to non-payment of annual fee |