CN202325445U - Multi-grade detonation control assembly for cable transmission perforation - Google Patents
Multi-grade detonation control assembly for cable transmission perforation Download PDFInfo
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- CN202325445U CN202325445U CN2011205221271U CN201120522127U CN202325445U CN 202325445 U CN202325445 U CN 202325445U CN 2011205221271 U CN2011205221271 U CN 2011205221271U CN 201120522127 U CN201120522127 U CN 201120522127U CN 202325445 U CN202325445 U CN 202325445U
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Abstract
The utility model relates to a multi-grade detonation control assembly for cable transmission perforation. The multi-grade detonation control assembly is mainly used for perforating a shale oil gas horizontal well in the development of an oil gas field. The assembly comprises a multi-grade monitoring detonating device on the ground, a hydraulic conversion device and a perforation gun, wherein the hydraulic conversion device and the perforation gun are connected with each other and are located under a well; the perforation gun is internally provided with a detection unit and a detonation unit; the multi-grade monitoring detonating device, the hydraulic conversion device, and the detection unit and the detonation unit in the perforation gun are conducted through multi-core transmission cable bypaths, wherein the hydraulic conversion device is composed of an upper connector and a lower connector. The function of a pressure switch is realized in a way that the assembly is switched-on/off under the hydraulic pushing of a long inserting needle and a connecting sleeve of the hydraulic conversion device; after the next grade of the perforation gun is detonated, the next grade of the perforation gun can be switched off and the last grade of the perforation gun is connected through the hydraulic conversion to realize the aim of detonating to perforate again, so that a plurality of perforation layers can be finished by placing a plurality of grades of gun strings and a plurality of the detonation units into the well for one time; and therefore, the aim of detonating to perforate for a plurality of times is realized, the underground working efficiency is improved, the labor strength of operators is reduced and the construction period is shortened.
Description
Technical field
The utility model relates to a kind of oil-gas field development perforation field, the concrete oil gas well that relates to, the especially used multistage initiation control assembly of a kind of cable transmission perforation during shale oil air water horizontal well perforation.
Background technology
Multi-stage perforator is to utilize cable to realize that multistage rifle string once goes into the well, and the perforating gun that repeatedly detonates is step by step accomplished the technology of perforation.The realization of multi-stage perforator mainly contains two class methods at present, and one type is to adopt the hydraulic pressure conversion equipment, after being detonated by subordinate rifle, utilizes the hydraulic pressure conversion equipment to realize that step by step the connection of higher level's perforating gun detonates, and accomplishes the purpose of multi-stage perforator; Another kind of method is to utilize to publish electric detonator, is assemblied in the couplet gun joint of multistage rifle string, sends instruction by ground, thereby through the cable transmission arbitrary number of level perforating gun that detonates, realizes the purpose of perforation.Yet, because the syndeton between the existing multimachine rifle is careful inadequately like operation in use to the line link is many between the rifle, operational sequence is many, possibly cause perforating gun normally not detonate, increased repeated workload, had a strong impact on progress.
The utility model content
In order to improve in the oil gas well to a plurality of perforation layers position a plurality of perforating guns of once going into the well, the efficient of repeatedly detonate perforation, multi-stage perforator, the utility model provides a kind of cable transmission perforation multistage initiation control assembly.The multistage initiation control assembly of this cable transmission perforation can be realized the down-hole multilevel perforating gun, once goes into the well, and the perforation mode of repeatedly detonating improves the operating efficiency height of going into the well, and alleviates operator's labour intensity, shortens construction period.
The technical scheme of the utility model is: the multistage initiation control assembly of a kind of cable transmission perforation, comprise the hydraulic pressure conversion equipment, and wherein, described hydraulic pressure conversion equipment is made up of top connection and lower contact;
Described top connection is made up of body one and the upconverter and the down-converter that are positioned at body one; And described upconverter comprises positioning seat, and positioning seat is built-in with two conductive levers one of conductive lever two and band jack, and the right-hand member that is positioned at the conductive lever one in axle center has conductive cap, and the right-hand member of another conductive lever one and conductive lever two has slip ring;
Described down-converter is positioned at the right-hand member of upconverter, comprises overcoat, described overcoat liner insulation sleeve; The right-hand member of insulation sleeve is a felt pad, and the left end of insulation sleeve is a gland, is equipped with fixed cover, fixed disk and big conducting block in the insulation sleeve successively; Be equipped with big spring between fixed disk and big conducting block; The shaft part of above-mentioned fixed cover is fixed on the fixed disk, and be equipped with center contact successively in its hole, little spring and little conducting block, an end of center contact contacts with above-mentioned conductive cap after passing gland; The other end of center contact is followed successively by little spring and little conducting block; The downside of fixed cover is equipped with the bypass contact, and an end of bypass contact contacts with slip ring after passing gland, and the other end is positioned on the fixed disk; Fixing short contact on the above-mentioned big conducting block;
And above-mentioned lower contact comprises the body two that is connected with body one; Be equipped with left pressure cap, long contact pin, adapter sleeve, short contact pin and right pressure cap in the centre bore of said body two from left to right successively; The centre bore of said left pressure cap is installed with the contact pin that left end contacts with above-mentioned big conducting block, and the right-hand member cover of contact pin is inserted the left end of long contact pin, and the right-hand member of long contact pin inserts in the adapter sleeve; The right-hand member cover of adapter sleeve is inserted short contact pin, and the other end of short contact pin is connected with the plug in placing right pressure cap hole; The annular distance of said body two (29) right-hand members is as hydraulic cavities, and hydraulic cavities is built-in with piston, the liquid injection hole on the piston successively with hydraulic cavities and body two on centre bore communicate.
Between the outer shaft shoulder of the female end of described body one left end and said positioning seat bearing is arranged; And be equipped with insulation spacer between the shaft shoulder in the two ends of conductive lever one and conductive lever two and positioning seat, the left end wall of positioning seat is provided with the screw that is used to connect higher level's perforating gun; Described gland is located by jackscrew with outer inner room, and the jackscrew location is arranged between the right side of the right-hand member of overcoat and body one; All be equipped with felt pad between above-mentioned contact pin and long contact pin and between adapter sleeve and short contact pin; All be equipped with felt pad between above-mentioned contact pin and long contact pin and between adapter sleeve and short contact pin; Have pressure transmission hole on the described body two, the welding block of the built-in band sealing ring of pressure transmission hole, the built-in sealing jackscrew of the liquid injection hole on the described piston.
The beneficial effect of the utility model:, under the promotion of hydraulic piston, realize switching function to upper and lower level rifle through long contact pin and adapter sleeve in the hydraulic pressure conversion equipment owing to adopted above-mentioned hydraulic pressure conversion equipment; After subordinate's perforating gun detonates,, realize breaking off subordinate's perforating gun through the hydraulic pressure conversion; Connect higher level's perforating gun, realize detonating once more the purpose of perforation, thereby realize that multistage rifle string and a plurality of unit that detonates once go into the well; Completion is to a plurality of perforation layers position realize repeatedly detonating purpose of perforation; Thereby improve the operating efficiency height of going into the well, alleviate operator's labour intensity, shorten construction period.
Description of drawings
Fig. 1 is the real structural representation of the utility model;
Structural representation when Fig. 2 has the multicore transmission cable for the utility model is real.
1-conductive lever one among the figure, 2-screw, 3-conductive lever two, 4-insulation spacer, 5-bearing, 6-positioning seat, 7-body one, 9-conductive cap; The 10-slip ring, 11-center contact, 12-gland, 13-jackscrew, 14-bypass contact, 15-overcoat, 16-fixed cover, 17-fixed disk; The 18-little spring, the little conducting block of 19-, 20-sealing ring, 21-big spring, the short contact of 22-, the big conducting block of 23-, 24-insulation sleeve, 25-jackscrew; The 26-felt pad, 27-contact pin, 28-left side pressure cap, 29-body two, the long contact pin of 30-, 31-sealing ring, 32-adapter sleeve; The 33-welding block, 34-sealing ring, 35-felt pad, the short contact pin of 36-, the right pressure cap of 37-, 39-sealing ring, 40-piston; 41-seals jackscrew, 42-plug, the long admittance line of 43-, 44-subordinate rifle, 45-higher level's rifle, 46-detecting element, the 47-unit that detonates.
The specific embodiment
Further specify this adaptation is novel below in conjunction with accompanying drawing:
By Fig. 1 and shown in Figure 2; The multistage initiation control assembly of this cable transmission perforation comprises detonate appearance and be positioned at hydraulic pressure conversion equipment and the perforating gun that the down-hole connects at interval of ground multilevel monitor; Perforating gun is built-in with detecting unit 46 and the unit 47 that detonates, and described multilevel monitor detonates the detecting unit 46 in appearance, hydraulic pressure conversion equipment and the perforating gun and the unit 47 that detonates by multicore transmission cable by-path turn-on.Wherein, described hydraulic pressure conversion equipment is made up of top connection and lower contact;
Described top connection is made up of body 1 and the upconverter and the down-converter that are positioned at body 1; And described upconverter comprises positioning seat 6; Positioning seat 6 is built-in with two conductive levers 1 of conductive lever 23 and band jack; The right-hand member that is positioned at the conductive lever 1 in axle center has conductive cap 9, and the right-hand member of another conductive lever 1 and conductive lever 23 has slip ring 10;
Described down-converter is positioned at the right-hand member of upconverter, comprises overcoat 15, described overcoat 15 liner insulation sleeves 24; The right-hand member of insulation sleeve 24 is a felt pad 26, and the left end of insulation sleeve 24 is a gland 12, is equipped with fixed cover 16, fixed disk 17 and big conducting block 23 in the insulation sleeve 24 successively; 23 of fixed disk 17 and big conducting blocks are equipped with big spring 21; The shaft part of said fixing cover 16 is fixed on the fixed disk 17, and be equipped with center contact 11 successively in its hole, little spring 18 and little conducting block 19, an end of center contact 11 passes gland 12 backs and contacts with above-mentioned conductive cap 9; The other end of center contact 11 is followed successively by little spring 18 and little conducting block 19; The downside of fixed cover 16 is equipped with bypass contact 14, and an end end of bypass contact 14 passes gland 12 backs and contacts with slip ring 10, and the other end is positioned on the fixed disk 17; Fixing short contact 22 on the above-mentioned big conducting block 23;
And above-mentioned lower contact comprises and body one 7 bolted bodies 2 29; Be equipped with left pressure cap 28, long contact pin 30, adapter sleeve 32, short contact pin 36 and right pressure cap 37 in the centre bore of said body 2 29 from left to right successively; The centre bore of said left pressure cap 28 is installed with contact pin 27; Contact pin 27 left ends contact with above-mentioned big conducting block 23, and the right-hand member cover is inserted the left end of long contact pin 30, and the right-hand member of long contact pin 30 inserts in the adapter sleeve 32; The right-hand member cover of adapter sleeve 32 is inserted short contact pin 36, and the other end of short contact pin 36 is threaded and is positioned at the plug 42 in right pressure cap 37 holes; The annular distance of said body 2 29 right-hand members is as hydraulic cavities, and hydraulic cavities is built-in with piston 40, and centre bore communicates the built-in sealing jackscrew 41 of the liquid injection hole on the described piston 40 on the liquid injection hole on the piston and hydraulic cavities and the body 2 29.
Between the female end of described body one 7 left ends and the said positioning seat 6 outer shaft shoulders bearing 5 is arranged; And be equipped with insulation spacer 4 between the shaft shoulder in the two ends of conductive lever 1 and conductive lever 23 and positioning seat 6, the left end wall of positioning seat 6 is provided with screw 2 and is used to connect higher level's perforating gun.15 in described gland 12 and overcoat have jackscrew 25 to locate by jackscrew 13 location between the right side of the right-hand member of overcoat 15 and body 1.30 of above-mentioned contact pin 27 and long contact pins and adapter sleeve 32 and short 36 of contact pins all are equipped with felt pad 35.
Be equipped with sealing jackscrew 41 on the described piston 40, unload this jackscrew, press oil to the hydraulic pressure cavity liquid injecting, described body 2 29 has pressure transmission hole, and the welding block 33 of the built-in band sealing ring 34 in hole is used for the pressure in the balanced hydraulic chamber.
In addition, body 1 is equipped with sealing ring 20 with the linkage section of body 2 29; 40 in hydraulic cavities wall and piston are equipped with sealing ring 39; Be equipped with sealing ring 31 between the center hole wall of long contact pin 30 and body 2 29, concrete structure is as shown in Figure 1.
In the said structure; Lower contact realizes connecting subordinate's rifle; Under the hydraulic action behind subordinate's rifle perforation, break off subordinate's rifle simultaneously, top connection has comprised upconverter and down-converter, and down-converter realizes that the signal that is transported by ground is switched to upconverter; Connect higher level's rifle simultaneously, make higher level's rifle be in state to be penetrated
Above-mentioned hydraulic pressure conversion equipment is used to connect subordinate's perforating gun 44 and higher level's perforating gun 45, when multistage rifle polyphone connects, can between per two rifles, connect this hydraulic pressure conversion equipment, and as shown in Figure 2, this initiation control assembly can connect 10 rifles at most.During perforating job; At first; Connect this hydraulic pressure conversion equipment and perforating gun on ground; Lead of connection and detonating fuse are wound in firing mount with rotation direction in the rifle that between per two hydraulic pressure conversion equipments, connects, and are connected with upper and lower hydraulic pressure conversion equipment again, in the rifle body, assemble the detecting unit 46 and the unit 47 that detonates simultaneously.Then, in the process of going into the well, the long admittance line 43 that appearance is connected that detonates of detonate unit 47 and the ground monitoring in each perforating gun is in off-state, the assurance safety.After multistage rifle string is lowered to well head, carry out the ground continuity test, guarantee that detecting unit 46 is in channel status.Instantly after desired depth, at first detect through the monitoring appearance that detonates, carry out detonating of subordinate's rifle afterwards; Accomplish the perforating gun perforation when detonating after, well liquid gets in this grade perforating gun, and the well hydraulic coupling promotes the piston 40 in the hydraulic pressure conversion equipment; Piston 40 breaks off long contact pin 30 and adapter sleeve 32 under force, realizes the function of breaking off with subordinate's perforating gun 44; Break off subordinate's perforating gun, under the impetus of hydraulic coupling, make long admittance line 43 switchings pass to down-converter simultaneously; Higher level's rifle is connected, be in state to be penetrated.
Hydraulic pressure conversion equipment operating principle like Fig. 1 and shown in Figure 2, is utilized the by-path turn-on circuit to connect subordinate's rifle and is detonated; Utilize the fluid pressure in subordinate's rifle perforation rear lance then, the piston 40 under promoting in the body, the pressure-bearing surface of piston 40 compression contact pins 30; Make its pressurized and contact pin 30 and adapter sleeve 32 are broken off, realize that the by-path turn-on circuit breaks off in subordinate's rifle, contact pin 30 continues left lateral under the piston pressure effect simultaneously; Promote contact pin 27, big conducting block 23 and short contact 22 successively, the Kong Yuxiao conducting block 19 that passes on the fixed cover 16 to short contact 22 contacts, and promotes little spring 18 and center contact 11 simultaneously; Center contact 11 contacts with conductive cap 9; The upconverter conducting, the detonate unit 47 and the detecting unit 46 of connection higher level rifle are switched to higher level's rifle detonation chain by the by-path turn-on circuit again; Realize the disconnection of the detonation chain of subordinate's rifle, higher level's rifle is in state to be penetrated.
The multistage initiation control assembly of this cable transmission perforation is specially adapted to the perforation exploitation of big well section shale gas horizontal well.Adopt multistage rifle string structure, multicore cable conveying-type perforation mode is once gone into the well; Multistage detonating realized, the purpose of segmenting perforating in repeatedly detonate the unit that detonates in the multi-stage perforator rifle; Improve the operating efficiency height of going into the well, alleviated labour intensity, shortened construction period.This multistage initiation control assembly wound is owing to adopted the hydraulic pressure conversion equipment; Realized after subordinate's perforating gun detonates; Through the hydraulic pressure conversion, realize breaking off subordinate's perforating gun, connect the function of higher level's perforating gun; The purpose of perforation thereby realization is detonated has once more satisfied the technical requirements for shale gas sleeve pipe straight well and horizontal well perforation exploitation.
Claims (5)
1. the multistage initiation control assembly of cable transmission perforation comprises the hydraulic pressure conversion equipment, and it is characterized in that: described hydraulic pressure conversion equipment is made up of top connection and lower contact;
Described top connection is made up of body one (7) and the upconverter and the down-converter that are positioned at body one (7); And described upconverter comprises positioning seat (6); Positioning seat (6) is built-in with two conductive levers one (1) of conductive lever two (3) and band jack; The right-hand member that is positioned at the conductive lever one (1) in axle center has conductive cap (9), and the right-hand member of another conductive lever one (1) and conductive lever two (3) has slip ring (10);
Described down-converter is positioned at the right-hand member of upconverter; Comprise overcoat (15), described overcoat (15) liner insulation sleeve (24), the right-hand member of insulation sleeve (24) are felt pad (26); The left end of insulation sleeve (24) is gland (12); Be equipped with fixed cover (16), fixed disk (17) and big conducting block (23) in the insulation sleeve (24) successively, be equipped with big spring (21) between fixed disk (17) and big conducting block (23), the shaft part of above-mentioned fixed cover (16) is fixed on the fixed disk (17); And be equipped with center contact (11), little spring (18) and little conducting block (19) in its hole successively; One end of center contact (11) passes gland (12) back and contacts with above-mentioned conductive cap (9), and the other end of center contact (11) is followed successively by little spring (18) and little conducting block (19), and the downside of fixed cover (16) is equipped with bypass contact (14); One end of bypass contact (14) passes gland (12) back and contacts with slip ring (10), and the other end is positioned on the fixed disk (17); Above-mentioned big conducting block (23) is gone up fixing short contact (22);
Described lower contact comprises the body two (29) that is connected with body one (7); Be equipped with left pressure cap (28), long contact pin (30), adapter sleeve (32), short contact pin (36) and right pressure cap (37) in the centre bore of said body two (29) from left to right successively; The centre bore of said left pressure cap (28) is installed with the contact pin (27) that left end contacts with above-mentioned big conducting block (23); The right-hand member cover of contact pin (27) is inserted the left end of long contact pin (30); The right-hand member of long contact pin (30) inserts in the adapter sleeve (32), and the right-hand member of adapter sleeve (32) cover is inserted short contact pin (36), and the other end of short contact pin (36) is connected with the plug (42) in placing right pressure cap (37) hole; The annular distance of said body two (29) right-hand members is as hydraulic cavities, and hydraulic cavities is built-in with piston (40), and the liquid injection hole on the piston (40) is gone up centre bore with hydraulic cavities and body two (29) successively and communicated.
2. the multistage initiation control assembly of cable transmission perforation according to claim 1; It is characterized in that: between the female end of described body one (7) left end and the outer shaft shoulder of said positioning seat (6) bearing (5) is arranged; And be equipped with insulation spacer (4) between the shaft shoulder in the two ends of conductive lever one (1) and conductive lever two (3) and positioning seat (6), be useful on the screw (2) that connects higher level's perforating gun on the left end wall of positioning seat (6).
3. the multistage initiation control assembly of cable transmission perforation according to claim 1; It is characterized in that: by jackscrew (13) location, locate by jackscrew (25) between the right side of the right-hand member of overcoat (15) and body one (7) between described gland (12) and overcoat (15).
4. the multistage initiation control assembly of cable transmission perforation according to claim 1 is characterized in that: all be equipped with felt pad (35) between above-mentioned contact pin (27) and long contact pin (30) and between adapter sleeve (32) and short contact pin (36).
5. the multistage initiation control assembly of cable transmission perforation according to claim 1; It is characterized in that: have pressure transmission hole on the described body two (29); The welding block (33) of the built-in band sealing ring of pressure transmission hole (34), the built-in sealing jackscrew of the liquid injection hole on the described piston (40) (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205221271U CN202325445U (en) | 2011-12-14 | 2011-12-14 | Multi-grade detonation control assembly for cable transmission perforation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205221271U CN202325445U (en) | 2011-12-14 | 2011-12-14 | Multi-grade detonation control assembly for cable transmission perforation |
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| Publication Number | Publication Date |
|---|---|
| CN202325445U true CN202325445U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205221271U Expired - Fee Related CN202325445U (en) | 2011-12-14 | 2011-12-14 | Multi-grade detonation control assembly for cable transmission perforation |
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| CN (1) | CN202325445U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103147724A (en) * | 2013-02-28 | 2013-06-12 | 西安物华巨能***器材有限责任公司 | Dual-purpose detonating device for detonating perforating gun |
| CN104533355A (en) * | 2014-12-25 | 2015-04-22 | 中国石油天然气股份有限公司 | Horizontal-well pumping selectable transmitting oriented perforating connecting device |
| CN108729889A (en) * | 2018-07-16 | 2018-11-02 | 西安物华巨能***器材有限责任公司 | Precisely measure and control device between comprehensive control wireless cascade communication rifle |
| CN108756833A (en) * | 2018-07-16 | 2018-11-06 | 西安物华巨能***器材有限责任公司 | Tubing transmission is comprehensive to be precisely controlled initiation system |
| CN108999598A (en) * | 2018-09-29 | 2018-12-14 | 西安物华巨能***器材有限责任公司 | A kind of perforating oil gas well electric igniter |
| CN111183270A (en) * | 2017-07-25 | 2020-05-19 | 狩猎巨人公司 | Hydraulic delay actuated by energy output of perforating gun |
| CN111954748A (en) * | 2018-01-31 | 2020-11-17 | 德力能欧洲有限公司 | Firing head assembly, completion assembly having a firing head assembly, and method of use |
| CN113565476A (en) * | 2021-08-16 | 2021-10-29 | 物华能源科技有限公司 | Cable conveying motor-driven all-dimensional control perforation system for oil-gas well |
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2011
- 2011-12-14 CN CN2011205221271U patent/CN202325445U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103147724A (en) * | 2013-02-28 | 2013-06-12 | 西安物华巨能***器材有限责任公司 | Dual-purpose detonating device for detonating perforating gun |
| CN103147724B (en) * | 2013-02-28 | 2015-07-01 | 西安物华巨能***器材有限责任公司 | Dual-purpose detonating device for detonating perforating gun |
| CN104533355A (en) * | 2014-12-25 | 2015-04-22 | 中国石油天然气股份有限公司 | Horizontal-well pumping selectable transmitting oriented perforating connecting device |
| CN111183270A (en) * | 2017-07-25 | 2020-05-19 | 狩猎巨人公司 | Hydraulic delay actuated by energy output of perforating gun |
| CN111954748A (en) * | 2018-01-31 | 2020-11-17 | 德力能欧洲有限公司 | Firing head assembly, completion assembly having a firing head assembly, and method of use |
| CN108729889A (en) * | 2018-07-16 | 2018-11-02 | 西安物华巨能***器材有限责任公司 | Precisely measure and control device between comprehensive control wireless cascade communication rifle |
| CN108756833A (en) * | 2018-07-16 | 2018-11-06 | 西安物华巨能***器材有限责任公司 | Tubing transmission is comprehensive to be precisely controlled initiation system |
| CN108756833B (en) * | 2018-07-16 | 2023-07-07 | 西安物华巨能***器材有限责任公司 | Oil pipe transmission omnibearing precision control detonating system |
| CN108729889B (en) * | 2018-07-16 | 2024-04-02 | 物华能源科技有限公司 | Accurate omnibearing control wireless cascade communication gun interval measurement and control device |
| CN108999598A (en) * | 2018-09-29 | 2018-12-14 | 西安物华巨能***器材有限责任公司 | A kind of perforating oil gas well electric igniter |
| CN108999598B (en) * | 2018-09-29 | 2023-10-31 | 物华能源科技有限公司 | Electric igniter for perforation of oil and gas well |
| CN113565476A (en) * | 2021-08-16 | 2021-10-29 | 物华能源科技有限公司 | Cable conveying motor-driven all-dimensional control perforation system for oil-gas well |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20201214 |