CN104314534A - Differential pressure flow meter-type smart adjustable throwing and fishing injection dispenser - Google Patents
Differential pressure flow meter-type smart adjustable throwing and fishing injection dispenser Download PDFInfo
- Publication number
- CN104314534A CN104314534A CN201410406443.0A CN201410406443A CN104314534A CN 104314534 A CN104314534 A CN 104314534A CN 201410406443 A CN201410406443 A CN 201410406443A CN 104314534 A CN104314534 A CN 104314534A
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- lateral wall
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- differential pressure
- pin
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- 238000002347 injection Methods 0.000 title abstract description 18
- 239000007924 injection Substances 0.000 title abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 36
- 230000008878 coupling Effects 0.000 claims abstract description 13
- 238000010168 coupling process Methods 0.000 claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 claims abstract description 13
- 210000000056 organ Anatomy 0.000 claims description 13
- 229920000642 polymer Polymers 0.000 abstract description 12
- 239000000203 mixture Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/066—Valve arrangements for boreholes or wells in wells electrically actuated
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Remote Sensing (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to a throwing and fishing injection dispenser, in particular to a differential pressure flow meter-type smart adjustable throwing and fishing injection dispenser, and aims to solve the problems that the eccentric injection dispenser used by the current oilfield polymer injection well cannot continuously adjust injection amount, cannot achieve precise injection and has relatively poor sealing performance. The differential pressure flow meter-type smart adjustable throwing and fishing injection dispenser comprises an upper connector body, an upper cable body, a pin body, a pin bridging component, a pin locking nut, a motor housing, a bearing housing, a connecting body, an upper casing body, a lower connector body, a central tube, a bearing set ejecting wire, a rigid coupling, an anti-rotating body, a middle cable connector assembly, an upper cable connector assembly, a shaft connecting rod, a vehicle-type seal installing frame, a bearing assembly, a vehicle-type seal, a pressure sensor, a motor, a plugger and a cable connector body. The differential pressure flow meter-type smart adjustable throwing and fishing injection dispenser is applied to oilfields.
Description
Technical field
The present invention relates to a kind of pulling note orchestration, be specifically related to a kind of differential pressure flowmeter formula intelligence adjustable pulling note orchestration.
Background technology
The energy is lifeline to develop national economy, is to promote the original power of national economic development, and oil, as wherein most crucial energy composition, its strategic importance and economic worth self-evident.At present, China's In Oil Field Exploration And Development experiences semicentennial development, the main producing region of national oil---and the oil field such as grand celebration, triumph progressively enters the High water cut stage, and partially aqueous rate is up to more than 90%.Therefore, be that the secondary oil recovery technology of core is progressively walked to be at the end with water flood recovery, the impact of oil recovery is progressively weakened.In order to ensure national strategy material, energy reserves and economy development requirement, keeping grand celebration to produce the core objective of 4,000 thousand ten thousand tons per year, must tertiary oil recovery technology be greatly developed.This is wherein obvious with the oil displacement efficiency of ternary oil recovery, should widely popularize.
But meanwhile, due to unique geologic property of the special physico-chemical character such as the contaminative of ter-polymers formation and corrosive pipeline and Different Strata, make tradition extensively general method for implanting be unsuitable for ter-polymers and inject.First, general injection cannot be injected as required for different strata condition, thus causes a large amount of ter-polymers wastes; Secondly, unnecessary ter-polymers injects not only bad for oil displacement efficiency, also can cause a large amount of formation contaminants.Therefore, ter-polymers how is utilized to be the key point solving ter-polymers application efficiently.According to the technological accumulation of oil extraction in oil field, layering is injected, and layering control technique solves the efficient best mode injected, and therefore, need greatly develop the layering control technique of ter-polymers.But because binary polymerization viscosity is large, corrosivity is strong, traditional water drive regulative mode easily results in blockage device blocking, and each regulation and control pulling difficulty is large, and workload is strong, and therefore, pulling regulates and controls---measurement and adjustment instrument is not also suitable for the layering regulation and control of ter-polymers.
Summary of the invention
The present invention is that the eccentric flow regulator solving existing oilfield injection well used can not realize regulating injection rate continuously, cannot realize accurate injection, and the problem that sealing is poor, and then differential pressure flowmeter formula intelligence adjustable pulling note orchestration is proposed.
The present invention is the technical scheme taked that solves the problem: the present invention includes top connection body, upper cable body, pin body, contact pin bridgeware, contact pin locking nut, electric machine casing, bear box, connector, upper shell body, lower contact body, center tubes, bearing group jackscrew, rigid coupling, prevent turning, intermediate cable adapter assembly, upper cable connector assembly, axial organ connecting rod, car formula sealing installing rack, bearing assembly, car formula seals, pressure sensor, motor, blanking plug and cable joint body, connector, center tubes from top to bottom sets gradually, and the upper end of center tubes is inserted in the lower end of connector, upper cable body, pin body, electric machine casing, bear box is from top to bottom sleeved on the lateral wall of connector successively, upper shell body, lower contact body is from top to bottom sleeved on the lateral wall of center tubes successively, top connection body is sleeved on the upper end of connector, pin body is arranged in the first annular housing of pin body by contact pin bridgeware, the top of pressure sensor is inserted in the second annular housing of electric machine casing, the bottom of pressure sensor is inserted in the 3rd annular housing of bear box, the first annular housing, second annular housing, 3rd annular housing composition outer chamber, motor, prevent turning, rigid coupling, axial organ connecting rod, leading screw, blanking plug is successively set in described outer chamber from top to bottom, anti-turning is arranged on motor, the turning cylinder of motor is connected by the upper end of rigid coupling with axial organ connecting rod, the lower end of axial organ connecting rod is connected with the upper end of leading screw, the lower end of leading screw is connected with the upper end of blanking plug, and the sealing of car formula is sleeved on the lateral wall of leading screw by car formula sealing installing rack, and bearing assembly is sleeved on the lateral wall of leading screw, and bearing assembly is positioned at the top of car formula sealing, intermediate cable adapter assembly, upper cable connector assembly, cable joint body is from top to bottom successively set in center tubes.
The invention has the beneficial effects as follows: the present invention drives screw turns by motor, leading screw drives the spool continuous moving in upper shell body and lower outside housing in dropping in and taking off type blanking plug, due to the motion of spool, taphole pressure is changed, the pressure of liquid feeding end is surveyed by inlet pressure sensor, the pressure of taphole is measured by outlet pressure sensor, data transmission is carried out again by circuit board, control motor in time finally by aboveground data processing and adjust mouth pressure to adjust injection rate, realize accurately injecting, accurate injection doubles than prior art, thus realize the continuous adjustment of injection rate.The present invention has good sealing not put, and can ensure that the place such as motor, circuit board does not have solution to enter, good sealing effect, and motor and circuit can normally be worked.Cable wiring of the present invention is easy, and easy for installation.Dropping in and taking off type blanking plug can put launch-work passage by throw in catcher via central tube pulling, and enters center tubes via labor passage, and is connected with locator.Greatly improve launch-work efficiency, save launch-work expense, facilitate and completely solve the blockage problem of ter-polymers.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention, Fig. 2 be in Fig. 1 A-A to sectional view, Fig. 3 be in Fig. 1 B-B to sectional view, Fig. 4 be in Fig. 1 C-C to sectional view, Fig. 5 be in Fig. 1 D-D to sectional view, Fig. 6 be in Fig. 1 E-E to sectional view, Fig. 7 is that in Fig. 1, F-F is to sectional view, and Fig. 8 is that in Fig. 6, J-J is to sectional view, and Fig. 9 is the structural representation of connector, Figure 10 is the main sectional view of rotatory sealing axle module, and Figure 11 is the annexation schematic diagram of leading screw dropping in and taking off type blanking plug.
Detailed description of the invention
Detailed description of the invention one: composition graphs 1 to Figure 11 illustrates present embodiment, described in present embodiment, differential pressure flowmeter formula intelligence adjustable pulling note orchestration comprises top connection body 1, upper cable body 2, pin body 3, contact pin bridgeware 4, contact pin locking nut 5, electric machine casing 6, bear box 7, connector 8, upper shell body 9, lower contact body 10, center tubes 11, bearing group jackscrew 12, rigid coupling 13, prevent turning 14, intermediate cable adapter assembly 15, upper cable connector assembly 16, axial organ connecting rod 17, car formula sealing installing rack 18, bearing assembly 19, car formula sealing 20, pressure sensor 21, motor 22, blanking plug 23 and cable joint body 24, connector 8, center tubes 11 from top to bottom sets gradually, and the upper end of center tubes 11 is inserted in the lower end of connector 8, upper cable body 2, pin body 3, electric machine casing 6, bear box 7 is from top to bottom sleeved on the lateral wall of connector 8 successively, upper shell body 9, lower contact body 10 is from top to bottom sleeved on the lateral wall of center tubes 11 successively, top connection body 1 is sleeved on the upper end of connector 8, pin body 3 is arranged in the first annular housing 3-1 of pin body 3 by contact pin bridgeware 4, the top of pressure sensor 21 is inserted in the second annular housing 6-1 of electric machine casing 6, the bottom of pressure sensor 21 is inserted in the 3rd annular housing 7-1 of bear box 7, the first annular housing 3-1, second annular housing 6-1, 3rd annular housing 7-1 forms outer chamber, motor 22, prevent turning 14, rigid coupling 13, axial organ connecting rod 17, leading screw 26, blanking plug 23 is successively set in described outer chamber from top to bottom, anti-turning 14 is arranged on motor 22, the turning cylinder of motor 22 is connected with the upper end of axial organ connecting rod 17 by rigid coupling 13, the lower end of axial organ connecting rod 17 is connected with the upper end of leading screw 26, the lower end of leading screw 26 is connected with the upper end of blanking plug 23, car formula sealing 20 is sleeved on the lateral wall of leading screw 26 by car formula sealing installing rack 18, bearing assembly 19 is sleeved on the lateral wall of leading screw 26, and bearing assembly 19 is positioned at the top of car formula sealing 20, intermediate cable adapter assembly 15, upper cable connector assembly 16, cable joint body 24 is from top to bottom successively set in center tubes 11.
Motor 22 in present embodiment, anti-ly turn 14, rigid coupling 13, axial organ connecting rod 17, leading screw 26, blanking plug 23, car formula sealing 20, car formula sealing installing rack 18 form rotatory sealing axle module.
The installation of cable in present embodiment: the 3rd cable aperture of cable cable body 2 from power on penetrates, through the gap of the first cable aperture again in pin body 3 of pin body 3, the kidney slot between the 3rd pin holes and the 3rd cable aperture enters the 3rd pin holes of upper cable body 2, the first pin holes again through pin body 3 is divided into two-way, one tunnel the 4th cable aperture, the 5th cable aperture, finally stretched out by the 6th cable aperture, another road is connected with motor 22, circuit board, outlet pressure sensor, inlet pressure sensor 21, and measurement the data obtained is delivered to ground installation by cable.
Detailed description of the invention two: composition graphs 1 illustrates present embodiment, described in present embodiment, differential pressure flowmeter formula intelligence adjustable pulling note orchestration also comprises multiple sealing ring 25, two sealing rings 25 are provided with between the lateral wall of top connection body 1 lower end and the lateral wall of upper cable body 2 upper end, two sealing rings 25 are provided with between the lateral wall of contact pin bridgeware 4 and the inside wall of the first annular housing 3-1, two sealing rings 25 are provided with between the lateral wall of pin body 3 lower end and the lateral wall of electric machine casing 6 upper end, two sealing rings 25 are provided with between the inside wall of electric machine casing 6 lower end and the lateral wall of bear box 7 upper end, two sealing rings 25 are provided with between the inside wall of bear box 7 lower end and the lateral wall of connector 8 bottom, two sealing rings 25 are provided with between the lateral wall of upper shell body 9 upper end and the inside wall of connector 8 lower end.Other composition and annexation identical with detailed description of the invention one.
Operating principle
Polymer solution is entered by top connection, under radial direction through hole 24 on the inner chamber, central tube 11 sidewall of the first centre bore, center tubes 11, taphole Injection Well, motor 22 is energized and is arranged in universal shaft coupling device hole, rigid coupling 13 drives leading screw 26 to rotate, leading screw 26 drives the spool in dropping in and taking off type blanking plug 23 to move up and down in 9 on shell body, change the joint number that solution flows through spool, thus realize the continuous adjustment of polymer solution injection rate.
Claims (2)
1. differential pressure flowmeter formula intelligence adjustable pulling note orchestration, is characterized in that: described differential pressure flowmeter formula intelligence adjustable pulling note orchestration comprises top connection body (1), upper cable body (2), pin body (3), contact pin bridgeware (4), contact pin locking nut (5), electric machine casing (6), bear box (7), connector (8), upper shell body (9), lower contact body (10), center tubes (11), bearing group jackscrew (12), rigid coupling (13), prevent turning (14), intermediate cable adapter assembly (15), upper cable connector assembly (16), axial organ connecting rod (17), car formula sealing installing rack (18), bearing assembly (19), car formula sealing (20), pressure sensor (21), motor (22), blanking plug (23), cable joint body (24) and leading screw (26), connector (8), center tubes (11) from top to bottom sets gradually, and the upper end of center tubes (11) is inserted in the lower end of connector (8), upper cable body (2), pin body (3), electric machine casing (6), bear box (7) is from top to bottom sleeved on the lateral wall of connector (8) successively, upper shell body (9), lower contact body (10) is from top to bottom sleeved on the lateral wall of center tubes (11) successively, top connection body (1) is sleeved on the upper end of connector (8), pin body (3) is arranged in first annular housing (3-1) of pin body (3) by contact pin bridgeware (4), the top of pressure sensor (21) is inserted in second annular housing (6-1) of electric machine casing (6), the bottom of pressure sensor (21) is inserted in the 3rd annular housing (7-1) of bear box (7), the first annular housing (3-1), second annular housing (6-1), 3rd annular housing (7-1) forms outer chamber, motor (22), prevent turning (14), rigid coupling (13), axial organ connecting rod (17), leading screw (26), blanking plug (23) is successively set in described outer chamber from top to bottom, anti-turn (14) are arranged on motor (22), the turning cylinder of motor (22) is connected with the upper end of axial organ connecting rod (17) by rigid coupling (13), the lower end of axial organ connecting rod (17) is connected with the upper end of leading screw (26), the lower end of leading screw (26) is connected with the upper end of blanking plug (23), car formula sealing (20) is sleeved on the lateral wall of leading screw (26) by car formula sealing installing rack (18), bearing assembly (19) is sleeved on the lateral wall of leading screw (26), and bearing assembly (19) is positioned at the top of car formula sealing (20), intermediate cable adapter assembly (15), upper cable connector assembly (16), cable joint body (24) is from top to bottom successively set in center tubes (11).
2. orchestration is noted in the adjustable pulling of differential pressure flowmeter formula intelligence according to claim 1, it is characterized in that: described differential pressure flowmeter formula intelligence adjustable pulling note orchestration also comprises multiple sealing ring (25), two sealing rings (25) are provided with between the lateral wall of top connection body (1) lower end and the lateral wall of upper cable body (2) upper end, two sealing rings (25) are provided with between the lateral wall of contact pin bridgeware (4) and the inside wall of the first annular housing (3-1), two sealing rings (25) are provided with between the lateral wall of pin body (3) lower end and the lateral wall of electric machine casing (6) upper end, two sealing rings (25) are provided with between the inside wall of electric machine casing (6) lower end and the lateral wall of bear box (7) upper end, two sealing rings (25) are provided with between the inside wall of bear box (7) lower end and the lateral wall of connector (8) bottom, two sealing rings (25) are provided with between the lateral wall of upper shell body (9) upper end and the inside wall of connector (8) lower end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410406443.0A CN104314534B (en) | 2014-08-18 | 2014-08-18 | Differential pressure flow meter-type smart adjustable throwing and fishing injection dispenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410406443.0A CN104314534B (en) | 2014-08-18 | 2014-08-18 | Differential pressure flow meter-type smart adjustable throwing and fishing injection dispenser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104314534A true CN104314534A (en) | 2015-01-28 |
| CN104314534B CN104314534B (en) | 2017-04-26 |
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| CN201410406443.0A Active CN104314534B (en) | 2014-08-18 | 2014-08-18 | Differential pressure flow meter-type smart adjustable throwing and fishing injection dispenser |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507863A (en) * | 2015-12-07 | 2016-04-20 | 田山 | Automatic regulation and control system for polymer injection well |
| CN106499372A (en) * | 2016-10-18 | 2017-03-15 | 中国石油天然气股份有限公司 | Integrated electromagnetic type flow meter intelligence distributor |
| CN106703767A (en) * | 2017-03-08 | 2017-05-24 | 中国石油天然气股份有限公司 | Water distributor |
| CN108019193A (en) * | 2016-11-02 | 2018-05-11 | 中国石油化工股份有限公司 | Hollow survey adjusts one to note poly- device |
| CN112240185A (en) * | 2020-10-26 | 2021-01-19 | 中国石油天然气股份有限公司 | Injection regulating assembly, injection allocator, and polymer injection dynamic blending device and process |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1286877A (en) * | 1969-12-09 | 1972-08-23 | Ross Nebolsine | Apparatus for effecting the filtration of fluids for example water and charging underground formations |
| RU2144613C1 (en) * | 1998-06-03 | 2000-01-20 | Внедренческий научно-исследовательский инженерный центр "Нефтегазтехнология" | Device for treating flow of water injected into injection wells |
| CN201165868Y (en) * | 2008-03-11 | 2008-12-17 | 张博文 | Intelligent adjustment eccentric water distributing apparatus |
| CN102305056B (en) * | 2011-09-22 | 2013-09-18 | 哈尔滨工业大学 | Eccentric electric injection allocation device for polymer injection well |
| CN102536181A (en) * | 2012-02-10 | 2012-07-04 | 哈尔滨工业大学 | Adjustable eccentric injection allocation device for polymer injection well |
| CN103352678B (en) * | 2013-06-27 | 2015-10-07 | 哈尔滨工业大学 | Layering continuously adjustabe injection allocation apparatus is selected in the poly-water filling of note |
| CN103343677B (en) * | 2013-06-27 | 2016-01-20 | 哈尔滨工业大学 | The automatically controlled continuously adjustabe injection allocation apparatus of baffle type non-over water injection well |
-
2014
- 2014-08-18 CN CN201410406443.0A patent/CN104314534B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507863A (en) * | 2015-12-07 | 2016-04-20 | 田山 | Automatic regulation and control system for polymer injection well |
| CN105507863B (en) * | 2015-12-07 | 2018-01-12 | 田山 | Automatic regulating system for polymer injection well |
| CN106499372A (en) * | 2016-10-18 | 2017-03-15 | 中国石油天然气股份有限公司 | Integrated electromagnetic type flow meter intelligence distributor |
| CN106499372B (en) * | 2016-10-18 | 2019-09-03 | 中国石油天然气股份有限公司 | Integrated electromagnetic type flow meter intelligence distributor |
| CN108019193A (en) * | 2016-11-02 | 2018-05-11 | 中国石油化工股份有限公司 | Hollow survey adjusts one to note poly- device |
| CN108019193B (en) * | 2016-11-02 | 2023-09-05 | 中国石油化工股份有限公司 | Hollow measuring and adjusting integrated polymer injection device |
| CN106703767A (en) * | 2017-03-08 | 2017-05-24 | 中国石油天然气股份有限公司 | Water distributor |
| CN112240185A (en) * | 2020-10-26 | 2021-01-19 | 中国石油天然气股份有限公司 | Injection regulating assembly, injection allocator, and polymer injection dynamic blending device and process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104314534B (en) | 2017-04-26 |
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Inventor after: Li Longqiu Inventor after: Zhang Dianjin Inventor after: Mo Yi Inventor after: Li Pengchun Inventor after: Huang Zhiyuan Inventor after: Zhou Dekai Inventor after: Song Wenping Inventor after: Zhang Guangyu Inventor after: Qiao Jing Inventor after: Qiao Jianxin Inventor after: Chang Xiaocong Inventor after: Wu Yingdan Inventor after: Lu Jia Inventor before: Li Longqiu Inventor before: Zhou Dekai Inventor before: Fu Xingyu Inventor before: Wang Wuyi Inventor before: Song Wenping Inventor before: Li Tianlong |
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