CN201924878U - Half-cementing well completion pipe string - Google Patents
Half-cementing well completion pipe string Download PDFInfo
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- CN201924878U CN201924878U CN2011200312471U CN201120031247U CN201924878U CN 201924878 U CN201924878 U CN 201924878U CN 2011200312471 U CN2011200312471 U CN 2011200312471U CN 201120031247 U CN201120031247 U CN 201120031247U CN 201924878 U CN201924878 U CN 201924878U
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Abstract
The utility model relates to the technologies of well-drilling, well completion and cementation in petroleum industry, and particularly provides a half-cementing well completion pipe string, so as to overcome the diameter reducing problem of the plug-drilling-free half-cementing technology employing no inner pipe. The well completion pipe string comprises an external casing packer, a sizing collar and a casing pipe, which are sequentially connected, wherein a blanking plug and a rubber plug are positioned in the external casing packer and the sizing collar; a positioning groove is arranged on the inner wall of the external casing packer, and the positioning block of the blanking rubber is embedded in the positioning groove; and a closing groove is arranged on the inner wall of the sizing collar, and the closing block on the blanking rubber is embedded in the closing groove. The half-cementing well completion pipe string is applicable to the non-inner pipe half-cementing operation, and the drift diameter of the well completion tool of the pipe string is equal to the internal diameter of the casing pipe.
Description
Technical field
The utility model relates to a kind of petroleum industry drilling well cementing completion tubular column, and especially a kind of half way cementing completion tubular column is applied to part well section cementing job in the oil field development drilling completion engineering.
Background technology
At present, the horizontal well development technology has been adopted in the oil field in a large number, and wherein an important completion method is to adopt horizontal well screen casing crest water flooding mud technology.This technology is at " horizontal well and sidetrack horizontal well screen casing crest water flooding mud completion technique " [Song Xianmin; Zhang Limin; Li Liangchuan; Yin Caixia; Tang Jinghui; Jin Yanqing; Song Yingzhi. petroleum journal, 2007,28 (01): 119～121] done detailed introduction in the literary composition.Its completion tubular column mainly comprises flushing valve, screen casing or screen casing+oil layer section open hole packer, blind plate, external packer of pipe, sizing collar and sleeve pipe.Its completion step is: 1. completion tubular column is arrived design attitude down, press the setting pipe external packer in 2. beating, 3. boost again and open sizing collar, 4. cementing behind the circulating mud, 5. throw plug, sizing collar is closed in bruising, 6. waits and coagulates, 7. bore plug, 8. the oil reservoir position is for slurry, well-flushing.In whole completion step, " boring plug " activity time is long, and there are undergauge and irregular problem in the position of boring, and the surplus blind plate of brill can fall into lower screen influences the postorder operation, and job parameter is improper also can damage sizing collar and sleeve pipe.
Only with regard to cementing job, because be part well section cementing job at oil well, what have is referred to as stage cementing technology, also is referred to as half way cementing technology.
Above-mentioned for solving " boring plug " working-procedure problem, Chinese patent " a kind of plug half way cementing instrument that the do not bore " (applying date: 2007.11.23, notice of authorization number: CN201110159Y, the patent No. 200720181986.2) discloses the interior pipe method cementing of a kind of application and do not bored the plug well-completing process, but this technology is managed owing in using, cementing pressure height, and flow is little, cementing quality is affected, and application is restricted.Used a kind of " pipe does not bore plug half way cementing technology in not having " on the oil field at present, it is between external packer of pipe and sizing collar, is positioned under the hydraulic setting hole of packer a undergauge step is set, and has a blanking plug to sit thereon.Its completion tubular column structure mainly comprises flushing valve, screen casing or screen casing+oil layer section open hole packer, external packer of pipe, sizing collar, blanking plug and sleeve pipe.Its completion step is: 1. completion tubular column is arrived design attitude down, press the setting pipe external packer in 2. beating, 3. boost again and open sizing collar, 4. cementing behind the circulating mud, 5. throw plug, sizing collar is closed in bruising, 6. descends fishing tool to pull blanking plug out, 7. wait and coagulate, 8. the oil reservoir position is for slurry, well-flushing.That this method has solved is former " boring plug " working-procedure problem, but brought new problem because it has adopted the undergauge step, has brought trouble for the oil producing operation after the completion, has especially influenced the use of major diameter instrument.
Summary of the invention
The undergauge problem of above-mentioned for solving " pipe does not bore plug half way cementing technology in having ", the utility model provides a kind of half way cementing completion tubular column, adopts the oil well of the utility model institute operation, and the interior latus rectum of completion tool is identical with the completion casing internal diameter.
The utility model is achieved in that a kind of half way cementing completion tubular column, comprises the external packer of pipe, sizing collar and the sleeve pipe that are linked in sequence from bottom to top, and blanking plug places in external packer of pipe and the sizing collar, and plug is positioned on the blanking plug; Blanking plug comprises detent mechanism, sealing mechanism and closing organ, and detent mechanism links to each other up and down with closing organ, and sealing mechanism is enclosed within the detent mechanism outside; Around the outside of described detent mechanism locating piece is installed, is provided with detent on the inwall of external packer of pipe, described locating piece embeds wherein; Install around the outside of described closing organ and close piece, be provided with on the inwall of sizing collar and close groove, the described piece of closing embeds wherein; Described sealing mechanism comprises packing element, and packing element is positioned at the inlet opening below of external packer of pipe.
Described detent mechanism comprises pipe, position outer tube, locating piece, lock dog, releasing tube, release shear pin in the location, described position outer tube is enclosed within outside the interior pipe in location, the position outer tube sidewall is opened stepped hole, locating piece radially stretches out from stepped hole from inside to outside, releasing tube is enclosed within the location in the pipe, connect on the releasing tube close in pipe and lower end be positioned at below the lock dog pipe side-wall hole in the location, the position outer tube inwall of corresponding tapping is established groove, and lock dog embeds in described perforate and the groove; Described sealing mechanism comprises packing element, locking cap, and it is outer and be positioned on the position outer tube that packing element is enclosed within the location pipe, and locking cap places on the packing element and is enclosed within the location outside the pipe, is provided with screw thread between locking cap and the interior pipe in location; Described closing organ comprises closes interior pipe, closes outer tube, closes piece, and the described outer tube sleeve of closing outside the pipe, is closed outer tube wall and opened stepped hole in closing, and closes piece and radially stretches out from stepped hole from inside to outside.Plug comprises the plug central tube, at two of plug central tube or wherein arbitrary head be provided with the plug plug, plug plug material is pottery or glass.
Compared with prior art, the beneficial effects of the utility model are: because completion tubular column of the present utility model has adopted detent mechanism and closing organ, its locating piece and close piece and embed in the corresponding sidewall notches, be recoverable to after the release, make that the interior latus rectum of whole external packer of pipe and sizing collar can be suitable with casing inner diameter, solved because of the undergauge step and given the completion trouble that oil producing operation afterwards brings, large diameter instrument can be passed through smoothly.
Description of drawings
Fig. 1 is the structural representation of a kind of half way cementing of the utility model completion tubular column.
Fig. 2 is the structural representation of blanking plug.
Fig. 3 is the structural representation of plug.
Fig. 4 is a band spring lock dog locking mechanism schematic diagram.
Fig. 5 is with "T"-shaped groove lock dog locking mechanism schematic diagram.
Fig. 6 is the sectional view of A-A section among Fig. 5.
Fig. 7 is a band elastic claw lock dog locking mechanism schematic diagram.
Fig. 8 is the outwardly deploying structure partial schematic diagram of the middle pipe C92 of Fig. 7.
Fig. 9 is that locating piece is positioned at the local tubular column structure schematic diagram on the external packer of pipe inlet opening.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is described further.
With reference to figure 1.Fig. 1 is a kind of half way cementing completion tubular column structural representation of the present utility model, the stage casing of whole completion tubular column in the well 30 of only having drawn among the figure, comprise the external packer of pipe 1, sizing collar 3, the sleeve pipe 5 that connect from bottom to top, blanking plug 2 places external packer of pipe 1 and sizing collar 3, plug 4 places on the blanking plug 2, upper sleeve 5 can be connected to well head, lower tube external packer 1 following splicing sleeve or sand screen or other completion tool.
The general hydraulic setting formula of using of external packer of pipe 1 is provided with at the inwall of external packer of pipe 1 and sets with inlet opening 8, is provided with detent at inlet opening 8 with upper/lower positions, and locating piece 6 stretches out the outside of detent mechanism and embeds in the detent.Packing element 19 is arranged under the inlet opening 8.
Sizing collar 3 comprises to be opened shear pin 9, opens cover 10, sizing collar outer tube 11, close cover 31, sizing collar joint 15, wherein closes cover 31 and is made of sealed tube 12, lock ring 13 and lock ring pressure cap 14.The closing groove and both can be arranged on the inwall of lock ring pressure cap 14 of sizing collar inwall setting, also can be arranged on the inwall of sealed tube 12, also cover 31 tops can closed, the top of lock ring pressure cap 14 among Fig. 1 just, and reserve the gap between the lower end of sizing collar joint 15 as closing groove, close piece 7 embeddings and close in the groove.Fig. 1 is a kind of of sizing collar structure, it can also adopt other structure commonly used at present, the main composition of the structure that these are commonly used is the outer tube of sizing collar and inner opening cover and close cover, as long as it is closed to put to be provided with and closes groove, can realize function of the present utility model.
With reference to figure 2.Blanking plug 2 is made up of detent mechanism, sealing mechanism and closing organ.Detent mechanism comprises pipe 17 in the location, position outer tube 16, locating piece 6, lock dog 18, discharges shear pin 21, releasing tube 22, be nested inside and outside pipe 17 and the position outer tube 16 in the location, position outer tube 16 sidewalls are opened stepped hole, locating piece 6 one ends are installed in this stepped hole, and the other end stretches out from stepped hole and embeds in the detent of external packer of pipe 1 inwall; Manage 17 side-wall hole in the location, and install groove in the corresponding positions of position outer tube 16 inwalls, lock dog 18 places this hole and groove; Releasing tube 22 is enclosed within the location in the pipe 17, and pipe 23 links to each other and the lower end is positioned under the lock dog 18 in the closing of releasing tube 22 upper ends and closing organ, and fixes with release shear pin 21 between the pipe 17 in releasing tube 22 and the location.Sealing mechanism comprises packing element 19, locking cap 20, and it is outer and be positioned on the position outer tube 16 that packing element 19 is enclosed within the location pipe 17, locking cap 20 on packing element 19 and with the location in manage 17 between with being threaded; Closing organ comprise close in pipe 23, close outer tube 24, close piece 7, the mounting structure of closing piece 7 is identical with aforementioned locating piece 6.
Drag for releasing tube 22 inwalls if drag for lance, releasing tube 22 upper ends also can not be connected with the interior pipe 23 of closing of closing organ, at this moment, the lower, outer perimeter of pipe 23 should be established the undergauge step in closing, being convenient to close piece 7 regains, also in closing, manage 23 lower, outer perimeter undergauge step lower end and establish baffle ring, in case close piece 7 well that falls.The blanking plug of other different structure mode of employing Fig. 4 to Fig. 8 equally, hereinafter described also can be that closing organ is not connected with detent mechanism.
Lock dog 18 locks together pipe 17 and position outer tube 16 in the location under the support of releasing tube 22, and like this, locating piece 6 can not regained when sealing its annular space after packing element 19 usefulness locking caps 20 compress and open owing to the support of pipe 17 in locating just can not radially be regained yet.Equally, closing piece 7 manages in closing under 23 the support and also can radially not regain.Shown in Fig. 2 midship section, locating piece 6 and cut out piece 7 radial outside inferior horns and be preferably 90 ° also can be greater than 90 °, and the angle generally is 135 ° between 125 °～150 ° on its radial outside.Lock dog 18 can also replace with steel ball.
The sealing that the structure of sealing mechanism can also adopt screw thread commonly used in the underground hydraulic pressure packer and lock ring structure to guarantee packing element.
With reference to figure 3.Plug 4 comprises plug plug 29, snap ring 28, plug central tube 27, leather cup 26 and leather cup pressure cap 25.At two of plug central tube 27 or wherein arbitrary head plug plug 29 is set, plug plug 29 is a kind of friable materials, this friable material is pottery or glass preferably; Plug plug 29 can also be to bore material, and as aluminium or cast iron, used dragging under the lance also correspondingly will be with drill bit during salvaging.For the consideration of raising integrally, the lower end of plug 4 is provided with groove, built-in snap ring 28, and the inwall of pipe 23 is provided with groove in the closing of blanking plug 2, and snap ring 28 embeds wherein, drags for the inner chamber that lance both can have been salvaged plug 4 like this, also can salvage the inner chamber of blanking plug 2; When using the inner chamber that drags for lance salvaging blanking plug 2, snap ring 28 and corresponding construction can not established yet.
The course of work of the present utility model is such:
(1) lower tubular column.Before going into the well, external packer of pipe 1, sizing collar 3 and blanking plug 2 are assembled together by shown in Figure 1, connect sleeve pipe 5 on then, connect sleeve pipe or screen casing and other completion tool down, be lowered to design attitude in the well 30.
(2) setting pipe external packer.Beat hydraulic pressure in sleeve pipe 5, hydraulic coupling is by inlet opening 8 bloated tube sealing external packers 1, and this moment, packing element 19 was in sealing state, and the cover 10 of opening of sizing collar 3 is in closed condition.
(3) open sizing collar.Continue to boost to and open shear pin 9 and cut off, it is descending to open cover 10, inwardly exposes the side opening on the sizing collar outer tube 11, and sizing collar 3 is opened.
(4) first circulating mud post-infusion cement slurry.
(5) drop into plug 4, replace, sizing collar 3 is closed in bruising.Drop into plug 4 from well head, mud replaces plug 4 is delivered to blanking plug 2 upper ends, in the corresponding grooves of pipe 23, boost in snap ring 28 enters and closes, plug 4 promotion closing organs and releasing tube 22 are descending, discharging shear pin 21 is cut off, under the promotion of closing piece 7, to close cover and be about to side opening sealing on the sizing collar outer tube 11 for 31 times, this moment, pressure raise, ground observation is finished and is closed sizing collar 3 to bruising.Follow-up salvaging step is when salvaging the blanking plug inner chamber, and plug 4 lower ends are band clasp not also.
(6) salvage.Be lowered to and drag for lance, add the broken plug plug of the pressure of the drill, drag for lance and be lowered to plug 4 inner chambers or blanking plug 2 inner chambers to plug 4 upper ends.When the plug plug 29 of plug 4 is in the time of can boring material, drag for the lance lower end and should be with drill bit.
(7) discharge blanking plug.Last bailing lance, pipe 23 and releasing tube 22 were up in drive was closed, supporting in lock dog 18 at first loses to fall within manages in 17 in the location, at this moment pipe 17 and position outer tube 16 can relative motions with regard to unlocking in the location, and pipe 17 is up in the releasing tube 22 up drives location, and locating piece 6 loses interior support, when the 17 drive position outer tube 16 of pipe in the location are up, locating piece 6 is radially inwardly regained, and at this moment, packing element 19 also loses compressive force and regains.Pipe undergauge place, 23 up its underpart is higher than when closing piece 7 in closing, and closes piece 7 and loses interior support, closes outer tube 24 when up when pipe 17 up drives in the location, closes radially inwardly withdrawal of piece 7, and blanking plug 2 all discharges like this.
(8) trip out blanking plug 2 and plug 4.
(9) wait with fixed attention.
The locating piece 6 of blanking plug 2 or close piece 7 or the mounting structure of lock dog 18 can also adopt as shown in Figure 4 band spring lock dog locking mechanism, this similar structures generally adopts on the anchor tooth of oil field downhole tool hydraulic anchor, interior pipe A71, middle pipe A72 and outer tube A77 are nested together in proper order, establish spring 76 in the lock dog A73, be fixed on screw 74 and pressing plate 75 in the hole of middle pipe A72 sidewall, outer tube A77 inwall is established groove, and lock dog A73 embeds wherein.Move on interior pipe A71, when its outer step was crossed lock dog A73, lock dog A73 lost and supports the footpath and inwardly receive, and unlocked between middle pipe A72 and outer tube A77 and can relatively move.
The locating piece 6 of blanking plug 2 or the mounting structure of closing piece 7 can also adopt as Fig. 5, shown in Figure 6 be with "T"-shaped groove lock dog locking mechanism, this structure is similar to the binding site of cone to the slips of oil field downhole tool Y211 type packer, interior pipe B81, middle pipe B82 and outer tube B84 are nested together in proper order, manage in the "T"-shaped groove of B81 in lock dog B83 one end is installed in, the other end is therefrom managed in the areole of B82 and is stretched out, and embeds in the inboard wall groove of outer tube B84.When interior pipe B81 was up, lock dog B83 can inwardly receive in the footpath locking in the releasing between pipe B82 and the outer tube B84 under the drive of oblique "T"-shaped groove.
The locating piece 6 of blanking plug 2 or close piece 7 or the mounting structure of lock dog 18 can also adopt as Fig. 7, band elastic claw lock dog locking mechanism shown in Figure 8, interior pipe C91, middle pipe C92 and outer tube C94 are nested together in proper order, lock dog C93 is the part of middle pipe C92, the outwardly deploying figure of middle pipe C92 sees Fig. 8, the appearance projection of lock dog C93 can be one, also can be several, the radial outside inferior horn of projection can be 90 ° or greater than 90 °, the angle is 110 °～160 ° on the radial outside of projection, preferably 135 ° at two angles.Wherein manage same Fig. 4 of release principle of C92 and outer tube C94.
With reference to figure 9, the inlet opening that detent also can be located at external packer of pipe 1 is more than 8, and at this moment locating piece 6 is located on the packing element 19.
Be arts demand, as shown in Fig. 1, Fig. 2 and Fig. 9, the place of being tightly connected is equipped with sealing ring.
Claims (8)
1. half way cementing completion tubular column, comprise the external packer of pipe (1), sizing collar (3) and the sleeve pipe (5) that are linked in sequence from bottom to top, blanking plug (2) places in external packer of pipe (1) and the sizing collar (3), plug (4) is positioned on the blanking plug (2), it is characterized in that: blanking plug (2) comprises detent mechanism, sealing mechanism and closing organ, detent mechanism links to each other up and down with closing organ, and sealing mechanism is enclosed within the detent mechanism outside; Around the outside of described detent mechanism locating piece (6) is installed, is provided with detent on the inwall of external packer of pipe (1), described locating piece (6) embeds wherein; Install around the outside of described closing organ and close piece (7), be provided with on the inwall of sizing collar (3) and close groove, the described piece (7) of closing embeds wherein; Described sealing mechanism comprises packing element (19), and packing element (19) is positioned at inlet opening (8) below of external packer of pipe (1).
2. a kind of half way cementing completion tubular column according to claim 1, it is characterized in that: described detent mechanism comprises pipe (17) in the location, position outer tube (16), locating piece (6), lock dog (18), releasing tube (22), discharge shear pin (21), described position outer tube (16) is enclosed within manages outside (17) in the location, position outer tube (16) sidewall is opened stepped hole, locating piece (6) radially stretches out from stepped hole from inside to outside, releasing tube (22) is enclosed within manages in (17) in the location, connect on the releasing tube (22) and close interior pipe (23) and the lower end is positioned at below the lock dog (18), pipe (17) side-wall hole in the location, position outer tube (16) inwall of corresponding tapping is established groove, and lock dog (18) embeds in described perforate and the groove; Described sealing mechanism comprises packing element (19), locking cap (20), packing element (19) is enclosed within outside the interior pipe in location (17) and is positioned on the position outer tube (16), locking cap (20) places on the packing element (19) and is enclosed within and manages in the location outside (17), is provided with screw thread between the pipe (17) in locking cap (20) and the location; Described closing organ comprises closes interior pipe (23), closes outer tube (24), closes piece (7), the described outer tube (24) of cutting out is enclosed within and cuts out outside the interior pipe (23), close outer tube (24) sidewall and open stepped hole, close piece (7) and radially from stepped hole, stretch out from inside to outside.
3. a kind of half way cementing completion tubular column according to claim 1 is characterized in that: described locating piece (6) or the mounting structure of closing piece (7) are band spring lock dog locking mechanisms.
4. a kind of half way cementing completion tubular column according to claim 1 is characterized in that: described locating piece (6) or the mounting structure of closing piece (7) are to be with "T"-shaped groove lock dog locking mechanism.
5. a kind of half way cementing completion tubular column according to claim 1 is characterized in that: described locating piece (6) or the mounting structure of closing piece (7) are band elastic claw lock dog locking mechanisms.
6. a kind of half way cementing completion tubular column according to claim 1, it is characterized in that: described plug (4) comprises plug central tube (27), two or wherein arbitrary head at plug central tube (27) are provided with plug plug (29), and the material of plug plug (29) is pottery or glass.
7. according to claim 1 or 6 described a kind of half way cementing completion tubular columns, it is characterized in that: the lower end of described plug (4) is provided with groove, built-in snap ring (28).
8. half way cementing completion tubular column, comprise the external packer of pipe (1), sizing collar (3) and the sleeve pipe (5) that are linked in sequence from bottom to top, blanking plug (2) places in external packer of pipe (1) and the sizing collar (3), plug (4) is positioned on the blanking plug (2), it is characterized in that: blanking plug (2) comprises detent mechanism, sealing mechanism and closing organ, detent mechanism is not connected up and down with closing organ, and sealing mechanism is enclosed within the detent mechanism outside; Around the outside of described detent mechanism locating piece (6) is installed, is provided with detent on the inwall of external packer of pipe (1), described locating piece (6) embeds wherein; Install around the outside of described closing organ and close piece (7), be provided with on the inwall of sizing collar (3) and close groove, the described piece (7) of closing embeds wherein; Described sealing mechanism comprises packing element (19), and packing element (19) is positioned at inlet opening (8) below of external packer of pipe (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200312471U CN201924878U (en) | 2011-01-21 | 2011-01-21 | Half-cementing well completion pipe string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200312471U CN201924878U (en) | 2011-01-21 | 2011-01-21 | Half-cementing well completion pipe string |
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| Publication Number | Publication Date |
|---|---|
| CN201924878U true CN201924878U (en) | 2011-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200312471U Expired - Lifetime CN201924878U (en) | 2011-01-21 | 2011-01-21 | Half-cementing well completion pipe string |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606107A (en) * | 2011-01-21 | 2012-07-25 | 中国石油化工股份有限公司 | Halfway cementing well completion tube column and halfway cementing method |
| CN104153737A (en) * | 2013-05-14 | 2014-11-19 | 中国石油化工股份有限公司 | Device for releasing hydraulic power agitation in pipe column assembly and pipe column assembly |
| CN104278968A (en) * | 2013-07-05 | 2015-01-14 | 中国石油化工股份有限公司 | Piston type pressure-bearing pup joint for releasing water power surge and combined pipe column |
| CN107701121A (en) * | 2017-11-03 | 2018-02-16 | 中国海洋石油总公司 | Exempt from brill to exempt to drag for solid completion integral tubing string |
-
2011
- 2011-01-21 CN CN2011200312471U patent/CN201924878U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606107A (en) * | 2011-01-21 | 2012-07-25 | 中国石油化工股份有限公司 | Halfway cementing well completion tube column and halfway cementing method |
| CN102606107B (en) * | 2011-01-21 | 2015-02-18 | 中国石油化工股份有限公司 | Halfway cementing well completion tube column and halfway cementing method |
| CN104153737A (en) * | 2013-05-14 | 2014-11-19 | 中国石油化工股份有限公司 | Device for releasing hydraulic power agitation in pipe column assembly and pipe column assembly |
| CN104278968A (en) * | 2013-07-05 | 2015-01-14 | 中国石油化工股份有限公司 | Piston type pressure-bearing pup joint for releasing water power surge and combined pipe column |
| CN107701121A (en) * | 2017-11-03 | 2018-02-16 | 中国海洋石油总公司 | Exempt from brill to exempt to drag for solid completion integral tubing string |
| CN107701121B (en) * | 2017-11-03 | 2019-05-28 | 中国海洋石油集团有限公司 | Exempt to bore and exempts to fish out solid completion integral tubing string |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110810 Effective date of abandoning: 20150218 |
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| RGAV | Abandon patent right to avoid regrant |