CN204312036U - Differential pressure type air tap of downhole choke - Google Patents
Differential pressure type air tap of downhole choke Download PDFInfo
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- CN204312036U CN204312036U CN201420684266.8U CN201420684266U CN204312036U CN 204312036 U CN204312036 U CN 204312036U CN 201420684266 U CN201420684266 U CN 201420684266U CN 204312036 U CN204312036 U CN 204312036U
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- 230000007704 transition Effects 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 18
- 238000010276 construction Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 93
- 239000007788 liquid Substances 0.000 description 25
- 230000000694 effects Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000001055 chewing effect Effects 0.000 description 2
- 235000015111 chews Nutrition 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 241000521257 Hydrops Species 0.000 description 1
- 206010030113 Oedema Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
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Abstract
The utility model provides a differential pressure type downhole choke valve, including casing and the throttle stopper of setting in the casing, the casing comprises first casing and second casing through connecting bolt fixed connection, and the inside of casing is the cavity, and the top of casing is sealed, the bottom opening, the throttle stopper is located the cavity, is provided with the spring between the top of throttle stopper and the top of cavity, and spring and throttle stopper fixed connection, the top outside of casing be provided with the spring adjusting nut who is used for adjusting spring atress length with spring fixed connection; the middle upper end of the hollow cavity is symmetrically provided with a plurality of discharge holes along the circumferential direction of the shell, and the discharge holes are through holes. The differential pressure type underground throttle valve does not need to change the throttle part, only improves the throttle valve, removes the work of salvaging the throttle valve and the like, saves construction cost, reduces workload, has wide application range, is suitable for working in a deep well or a high-pressure gas well, and can also be used for gas production in an inclined well.
Description
Technical field
The utility model relates to a kind of gas well downhole tool tapped natural gas, and is specifically related to a kind of differential pressure underground throttle device valve.
Background technology
In natural gas extraction manufacturing process, need, in the wellhead assembly of gas well, a valve is installed, to control the gas production of gas well, to reach the object reducing pressure, steadily produce.In order to ensure the rational gas producting rate of gas well, gas well is gone into operation the initial stage, generally according to Gas well test situation, can determine gas well gas production, and the size of gas production is determined by the size of restriction choke valve and bottom pressure, the input degree of depth.For a bite gas well, gas well operation initial stage down-hole pressure is very high, general restriction choke mouth is less, and along with the increase of gas well liquid loading time, bottom pressure diminishes, output step-down, flow velocity reduces, restriction choke valve size does not meet current gas well liquid loading situation, under normal circumstances, can salvage restriction choke, again enter in Wellbore of Gas Wells down after changing large valve, in some gas well liquid loading processes even replaceable more than 3 times, but some restriction choke there will be the failed situation of salvaging when tripping out, successfully it can not be put forward from down-hole, even may there is situation about being broken by salvaging wire rope, cause the accident, therefore must take more complicated working measure to process, but for the process of accident, not only affect gas well liquid loading, also increase operating expenses simultaneously.
Number of patent application is 201120429624.7 disclose a kind of air tap of underground throttle with eddy current effect, vortex water conservancy diversion version is set in the valve of underground throttle device, when air-flow is through out-of-date, due to the effect of vortex deflector, disorderly multiphase flow is converted into a kind of orderly eddy current, gas at oil pipe immediate vicinity with the form of continuous gas column upwards, this forms of motion can make the pressure loss of gas motion upwards reduce, gas flow rate is increased, the fluid-carrying capability of final enhancing gas well, extends the gas well aneroid production cycle.This patent solves the problem of restriction choke hydrops, but restriction choke valve needs the problem repeatedly changed, still exists.
Number of patent application is 03209363.2 disclose high-efficient right angle restriction device, this restriction choke comprises plug, pin, main body, chews cover, sealing ring, air nozzle, centring ring and jump ring, air nozzle is arranged on chews in cover, positioned by centring ring, jump ring is arranged at the bottom of centring ring, and plug is connected by pin with chewing between cover, main body and chew between cover and have sealing ring, centring ring is arranged at the bottom of chewing cover, and sealing ring is more than one.Throttling directly realizes by the structural ceramics valve of high abrasion, through Long-Time Service find valve become large after, valve is taken out and changes, continue to use, solve restriction choke application life short and by the problem needing after being washed out all to change.This patent extends the application life of restriction choke by the structural ceramics valve of use high abrasion, but become greatly at valve, still need to salvage restriction choke, change valve, still there is the prolongation activity duration of causing owing to salvaging restriction choke, even salvage failed accident, affect gas well liquid loading, increase operating expenses.
Utility model content
The purpose of this utility model solves existing restriction choke valve to need frequent replacing, impacts gas well liquid loading, increases the problem of operating expenses.
For this reason, the utility model provides a kind of differential pressure underground throttle device valve, comprise housing and be arranged on the orifice plug in housing, described housing is composed of a fixed connection by connecting bolt by the first housing and the second housing, the inside of housing is hollow cavity, and the top closure of housing, bottom end opening, described orifice plug is positioned at hollow cavity, spring is provided with between the top of orifice plug and the top of hollow cavity, spring is fixedly connected with orifice plug, and the tip exterior of housing is provided with the spring adjusting nut for regulating spring stressed length be fixedly connected with spring;
The circumference of the middle part upper end edge housing of described hollow cavity is symmetrically arranged with multiple tap, and this tap is through hole.
Described hollow cavity is made up of the second reducing diameter part that cross section is the first upper end of rectangle, cross section first reducing diameter part that is rectangle, the cross section First Transition portion that is truncated cone, cross section be the first bottom of rectangle, cross section is rectangle from top to bottom successively.
Described orifice plug from top to bottom successively by cross section be the second upper end of rectangle, cross section the 3rd reducing diameter part that is rectangle, cross section second transition part that is truncated cone, cross section be that the second bottom of rectangle forms;
Described second upper-end part of driving is in the first upper end of hollow cavity, and the second lower end part is in the first bottom of hollow cavity, and the diameter of the second bottom is greater than the diameter in First Transition portion.
Described spring adjusting nut, housing, spring, orifice plug are on same central axis.
Described tap is arranged on the housing at the first place, upper end.
The beneficial effects of the utility model: (1) does not need to change restriction choke part, only improves restriction choke valve, remove work such as salvaging restriction choke from, save operating expenses, reduce workload;
(2) ensure that gas well is produced according to design stable yield, avoid the change due to gas well parameter, and the change of production caused;
(3) valve that the utility model provides both can be used for aerogenesis gas well, also can be used for water-producing gas well, and the tap on valve is conducive to the discharge of gas or liquid, when especially having liquid below restriction choke, the pressure that orifice plug is subject to diminishes, gas free air space increases, and flow increases, and is conducive to liquid and passes through;
(4) the utility model is applied widely, is applicable to work in deep-well or high-pressure gas well, also can be used for gas production in inclined shaft.
Below with reference to accompanying drawing, the utility model is described in further details.
Accompanying drawing explanation
Fig. 1 is the structural representation of differential pressure underground throttle device valve.
Fig. 2 is the top view of Fig. 1.
Description of reference numerals: 1, housing; 101, the first housing; 102, the second housing; 2, hollow cavity; 201, the first upper end; 202, the first reducing diameter part; 203, First Transition portion; 204, the first bottom; 205, the second reducing diameter part; 3, orifice plug; 301, the second upper end; 302, the 3rd reducing diameter part; 303, the second transition part; 304, the second bottom; 4, spring; 5, spring adjusting nut; 6, connecting bolt; 7, tap.
Detailed description of the invention
Further this self-adjustable differential restriction choke valve is described in detail below with reference to accompanying drawing 1 and accompanying drawing 2.
embodiment 1:
As shown in Figure 1, the utility model provides a kind of differential pressure underground throttle device valve, the orifice plug 3 comprising housing 1 and be arranged in housing 1, as shown in Figure 2, described housing 1 is assembled by two parts, namely be composed of a fixed connection by connecting bolt 6 by the first housing 101 and the second housing 102, concrete, connecting bolt 6 vertically runs through the first housing 101 and the second housing 102 along the radial direction of housing 1, respectively in the upper end of housing 1 near top end, the middle part of housing 1 arranges connecting bolt 6, the inside of housing 1 is hollow cavity 2, and the top closure of housing 1, bottom end opening, described orifice plug 3 is positioned at hollow cavity 2, spring 4 is provided with between the top of orifice plug 3 and the top of hollow cavity 2, this spring 4 coefficient of elasticity is fixed, spring 4 is fixedly connected with orifice plug 3, the tip exterior of housing 1 is provided with the spring adjusting nut 5 for regulating spring 4 stressed length be fixedly connected with spring 4, by the stressed length of regulating spring 4, and then change elastic force, the pressure that its coefficient of elasticity and orifice plug 3 are subject to is proportional, the circumference of the middle part upper end edge housing 1 of described hollow cavity 2 is symmetrically arranged with multiple tap 7, and this tap 7 is through hole.
For new well of going into operation, gas well pressure is comparatively large, and orifice plug 3 pressurized is also comparatively large, and the space between orifice plug 3 and housing 1 is less, and the flow passed through from hollow cavity 2 is also less; Along with the carrying out produced, gas well pressure diminishes gradually, the pressure that orifice plug 3 is subject to also reduces, spring 4 stretches, and be subject to the effect of spring 4 elastic force, space between orifice plug 3 and housing 1 becomes large, the space of gas circulation also becomes large, although the flow velocity of gas or liquid diminishes, output remains unchanged, along with gas well liquid loading, act on by spring 4 completely when the pressure in shaft bottom is varied down to orifice plug 3, gas free air space reaches maximum value, is equivalent to the without hindrance production of gas well, gas is finally discharged from tap 7, meets low yield effect gas field gas well production law and technique.
This differential pressure underground throttle device valve can in the whole life cycle of gas well, according to gas well pressure condition, space between orifice plug 3 and housing 1 is adjusted by spring 4, and then reach the object of adjustment restriction choke valve size, restriction choke is salvaged with existing needs, change large valve to compare, the utility model need not change valve, and restriction choke valve size can regulate automatically according to the pressure in pit shaft, output etc.; Meanwhile, the utility model is for water-producing gas well, applicable equally, when gas well production fluid, restriction choke valve two ends pressure reduction diminishes, and the pressure that orifice plug 3 is subject to diminishes, and spring 4 stretches, gas free air space increases, and corresponding flow increases simultaneously, and final liquid passes through from tap 7.The utility model saves operating expenses, decrease workload, avoid the gas well accident that salvaging restriction choke causes, also eliminate the frequent prolongation gas well liquid loading cycle changed restriction choke valve and cause simultaneously, this differential pressure underground throttle device valve is more convenient and practical, and simple to operate.
embodiment 2:
On the basis of embodiment 1, further, described hollow cavity 2 is made up of the second reducing diameter part 205 that cross section is the first upper end 201 of rectangle, cross section first reducing diameter part 202 that is rectangle, the cross section First Transition portion 203 that is truncated cone, cross section be the first bottom 204 of rectangle, cross section is rectangle from top to bottom successively.
When gas well pressure is larger, orifice plug 3 pressurized is also larger, space between orifice plug 3 and housing 1 is less, from hollow cavity 2, namely also less by the flow of the second reducing diameter part 205, first bottom 204, reducing diameter part 202, first upper end 201, First Transition portion 203, first successively; Along with the carrying out produced, gas well pressure diminishes gradually, the pressure that orifice plug 3 is subject to also reduces, spring 4 stretches, and be subject to the effect of spring 4 elastic force, space between orifice plug 3 and housing 1 becomes large, the space of gas circulation also becomes large, although the flow velocity of gas or liquid diminishes, output remains unchanged, along with gas well liquid loading, act on by spring 4 completely when the pressure in shaft bottom is varied down to orifice plug 3, gas free air space reaches maximum value, is equivalent to the without hindrance production of gas well, gas is finally discharged from tap 7, meets low yield effect gas field gas well production law and technique.The determination of hollow cavity 2 shape, the definitely size of gas or liquid communication space.
This differential pressure underground throttle device valve can in the whole life cycle of gas well, according to gas well pressure condition, space between orifice plug 3 and housing 1 is adjusted by spring 4, and then reach the object of adjustment restriction choke valve size, restriction choke is salvaged with existing needs, change large valve to compare, the utility model need not change valve, and restriction choke valve size can regulate automatically according to the pressure in pit shaft, output etc.; Meanwhile, the utility model is for water-producing gas well, applicable equally, when gas well production fluid, restriction choke valve two ends pressure reduction diminishes, and the pressure that orifice plug 3 is subject to diminishes, and spring 4 stretches, gas free air space increases, and corresponding flow increases simultaneously, and final liquid passes through from tap 7.The utility model saves operating expenses, decrease workload, avoid the gas well accident that salvaging restriction choke causes, also eliminate the frequent prolongation gas well liquid loading cycle changed restriction choke valve and cause simultaneously, this differential pressure underground throttle device valve is more convenient and practical, and simple to operate.
embodiment 3:
On the basis of embodiment 2, namely when the shape of hollow cavity 2 is determined, the orifice plug 3 arranged in hollow cavity 2 also has its corresponding shape, described orifice plug 3 from top to bottom successively by cross section be the second upper end 301 of rectangle, cross section the 3rd reducing diameter part 302 that is rectangle, cross section second transition part 303 that is truncated cone, cross section be that the second bottom 304 of rectangle forms; The first bottom 304, upper end 201, second that described second upper end 301 is positioned at hollow cavity 2 is positioned at the first bottom 204 of hollow cavity 2, and the diameter of the second bottom 304 is greater than the diameter in First Transition portion 203.
When gas well pressure is larger, orifice plug 3 pressurized is also larger, space between orifice plug 3 and housing 1 is less, from hollow cavity 2, namely also less by the flow of the second reducing diameter part 205, first bottom 204, reducing diameter part 202, first upper end 201, First Transition portion 203, first successively, along with the carrying out produced, gas well pressure diminishes gradually, the pressure that orifice plug 3 is subject to also reduces, spring 4 stretches, and be subject to the effect of spring 4 elastic force, space between orifice plug 3 and housing 1 becomes large, especially the first reducing diameter part 202 of hollow cavity 2 and the space between First Transition portion 203 and orifice plug 3 become large, i.e. the second transition part 303 of orifice plug 3 and the First Transition portion 203 of hollow cavity 2, space between 3rd reducing diameter part 302 of orifice plug 3 and the first reducing diameter part 202 of hollow cavity 2 becomes large, the space of gas circulation also becomes large, although the flow velocity of gas or liquid diminishes, but output remains unchanged, along with gas well liquid loading, act on by spring 4 completely when the pressure in shaft bottom is varied down to orifice plug 3, gas free air space reaches maximum value, be equivalent to the without hindrance production of gas well, gas is finally discharged from tap 7, meet low yield effect gas field gas well production law and technique.The determination of hollow cavity 2 shape, the definitely size of gas or liquid communication space.
This differential pressure underground throttle device valve can in the whole life cycle of gas well, according to gas well pressure condition, space between orifice plug 3 and housing 1 is adjusted by spring 4, and then reach the object of adjustment restriction choke valve size, restriction choke is salvaged with existing needs, change large valve to compare, the utility model need not change valve, and restriction choke valve size can regulate automatically according to the pressure in pit shaft, output etc.; Meanwhile, the utility model is for water-producing gas well, applicable equally, when gas well production fluid, restriction choke valve two ends pressure reduction diminishes, and the pressure that orifice plug 3 is subject to diminishes, and spring 4 stretches, gas free air space increases, and corresponding flow increases simultaneously, and final liquid passes through from tap 7.The utility model saves operating expenses, decrease workload, avoid the gas well accident that salvaging restriction choke causes, also eliminate the frequent prolongation gas well liquid loading cycle changed restriction choke valve and cause simultaneously, this differential pressure underground throttle device valve is more convenient and practical, and simple to operate.
embodiment 4:
On the basis of embodiment 3, it is pointed out that described spring adjusting nut 5, housing 1, spring 4, orifice plug 3 are on same central axis.Described tap 7 is arranged on the housing 1 at the first place, upper end 201.
The differential pressure underground throttle device valve that the utility model provides can in the whole life cycle of gas well, according to gas well pressure condition, by space between spring adjustment orifice plug and housing, and then reach the object of adjustment restriction choke valve size, restriction choke is salvaged with existing needs, change large valve to compare, the utility model need not change valve, and restriction choke valve size can regulate automatically according to the pressure in pit shaft, output etc.; Meanwhile, the utility model is for water-producing gas well, applicable equally, when gas well production fluid, restriction choke valve two ends pressure reduction diminishes, and the pressure that orifice plug is subject to diminishes, spring stretches, gas free air space increases, and corresponding flow increases simultaneously, and final liquid passes through from tap.The utility model saves operating expenses, decrease workload, avoid the gas well accident that salvaging restriction choke causes, also eliminate the frequent prolongation gas well liquid loading cycle changed restriction choke valve and cause simultaneously, this differential pressure underground throttle device valve is more convenient and practical, and simple to operate.
More than exemplifying is only illustrate of the present utility model, does not form the restriction to protection domain of the present utility model, everyly all belongs within protection scope of the present invention with the same or analogous design of the utility model.
Claims (5)
1. a differential pressure underground throttle device valve, comprise housing (1) and be arranged on the orifice plug (3) in housing (1), it is characterized in that, described housing (1) is composed of a fixed connection by connecting bolt (6) by the first housing (101) and the second housing (102), the inside of housing (1) is hollow cavity (2), and the top closure of housing (1), bottom end opening, described orifice plug (3) is positioned at hollow cavity (2), spring (4) is provided with between the top of orifice plug (3) and the top of hollow cavity (2), spring (4) is fixedly connected with orifice plug (3), the tip exterior of housing (1) is provided with the spring adjusting nut (5) for regulating spring (4) stressed length be fixedly connected with spring (4),
The circumference at middle part upper end edge housing (1) of described hollow cavity (2) is symmetrically arranged with multiple tap (7), and this tap (7) is through hole.
2. a kind of differential pressure underground throttle device valve as claimed in claim 1, it is characterized in that, described hollow cavity (2) is made up of the second reducing diameter part (205) that cross section is first upper end (201) of rectangle, cross section the first reducing diameter part (202) that is rectangle, the cross section First Transition portion (203) that is truncated cone, cross section be first bottom (204) of rectangle, cross section is rectangle from top to bottom successively.
3. a kind of differential pressure underground throttle device valve as claimed in claim 2, it is characterized in that, described orifice plug from top to bottom successively by cross section be second upper end (301) of rectangle, cross section the 3rd reducing diameter part (302) that is rectangle, cross section the second transition part (303) that is truncated cone, cross section be that second bottom (304) of rectangle forms;
Described second upper end (301) is positioned at first upper end (201) of hollow cavity (2), second bottom (304) is positioned at first bottom (204) of hollow cavity (2), and the diameter of the second bottom (304) is greater than the diameter of First Transition portion (203).
4. a kind of differential pressure underground throttle device valve as claimed in claim 3, is characterized in that, described spring adjusting nut (5), housing (1), spring (4), orifice plug (3) are on same central axis.
5. a kind of differential pressure underground throttle device valve as claimed in claim 4, is characterized in that, described tap (7) is arranged on the housing (1) at the first upper end (201) place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420684266.8U CN204312036U (en) | 2014-11-17 | 2014-11-17 | Differential pressure type air tap of downhole choke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420684266.8U CN204312036U (en) | 2014-11-17 | 2014-11-17 | Differential pressure type air tap of downhole choke |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204312036U true CN204312036U (en) | 2015-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420684266.8U Expired - Fee Related CN204312036U (en) | 2014-11-17 | 2014-11-17 | Differential pressure type air tap of downhole choke |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204312036U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201466A (en) * | 2015-11-02 | 2015-12-30 | 西南石油大学 | Automatic downhole stepless throttling device and method |
| CN105239959A (en) * | 2015-10-29 | 2016-01-13 | 西南石油大学 | Novel downhole choke |
| CN106014356A (en) * | 2016-07-12 | 2016-10-12 | 泸州聚源石油科技有限公司 | Sand-controlled movable type downhole throttle capable of balancing pressure |
| CN106285580A (en) * | 2016-09-30 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of underground throttle device |
| CN106468156A (en) * | 2015-08-21 | 2017-03-01 | 中国石油化工股份有限公司 | Down-hole Self adjusting air valve |
| CN106837266A (en) * | 2016-12-26 | 2017-06-13 | 中国石油天然气股份有限公司 | Gas well underground drainage and gas production tool based on integration of jet flow and vortex flow |
| CN108894760A (en) * | 2018-09-03 | 2018-11-27 | 中国石油集团川庆钻探工程有限公司 | Valve pipe combined type underground throttle for gas well production and use method thereof |
| CN112922564A (en) * | 2021-02-04 | 2021-06-08 | 西安石油大学 | Underground throttling device based on special degradable alloy ball conical plug adjustment |
-
2014
- 2014-11-17 CN CN201420684266.8U patent/CN204312036U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106468156A (en) * | 2015-08-21 | 2017-03-01 | 中国石油化工股份有限公司 | Down-hole Self adjusting air valve |
| CN105239959A (en) * | 2015-10-29 | 2016-01-13 | 西南石油大学 | Novel downhole choke |
| CN105239959B (en) * | 2015-10-29 | 2018-10-30 | 西南石油大学 | A kind of Novel down-hole flow nipple |
| CN105201466A (en) * | 2015-11-02 | 2015-12-30 | 西南石油大学 | Automatic downhole stepless throttling device and method |
| CN106014356A (en) * | 2016-07-12 | 2016-10-12 | 泸州聚源石油科技有限公司 | Sand-controlled movable type downhole throttle capable of balancing pressure |
| CN106014356B (en) * | 2016-07-12 | 2018-09-25 | 泸州聚源石油科技有限公司 | Pressure sand-proof type movable underground throttle can be balanced |
| CN106285580A (en) * | 2016-09-30 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of underground throttle device |
| CN106285580B (en) * | 2016-09-30 | 2018-09-28 | 中国石油化工股份有限公司 | A kind of underground throttle device |
| CN106837266A (en) * | 2016-12-26 | 2017-06-13 | 中国石油天然气股份有限公司 | Gas well underground drainage and gas production tool based on integration of jet flow and vortex flow |
| CN106837266B (en) * | 2016-12-26 | 2019-05-03 | 中国石油天然气股份有限公司 | Gas well underground drainage and gas production tool based on integration of jet flow and vortex flow |
| CN108894760A (en) * | 2018-09-03 | 2018-11-27 | 中国石油集团川庆钻探工程有限公司 | Valve pipe combined type underground throttle for gas well production and use method thereof |
| CN112922564A (en) * | 2021-02-04 | 2021-06-08 | 西安石油大学 | Underground throttling device based on special degradable alloy ball conical plug adjustment |
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Legal Events
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| 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: 20150506 |