CN105319020B - Jacket-type oil casing air tightness detection device and detection method - Google Patents
Jacket-type oil casing air tightness detection device and detection method Download PDFInfo
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- CN105319020B CN105319020B CN201510672683.XA CN201510672683A CN105319020B CN 105319020 B CN105319020 B CN 105319020B CN 201510672683 A CN201510672683 A CN 201510672683A CN 105319020 B CN105319020 B CN 105319020B
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Abstract
The invention discloses a jacket-type oil casing air tightness detection device and a detection method. The jacket-type oil casing air tightness detection device comprises an upper end cover, an upper central pipe, an adjusting joint, a lower central pipe and a lower end cover. Through holes are formed in central positions of the upper central pipe and the lower central pipe and are connected through the adjusting joint. One side of the adjusting joint is provided with a first high-pressure soft pipe joint. The inner walls, provided with the through holes, of the upper central pipe and the lower central pipe and are provided with grooves, and glue cylinders and extruding mechanism are respectively arranged in the grooves. Each extruding mechanism comprises four extruding forks uniformly arranged on the periphery of the glue cylinder, one end of each extruding fork is in contact with the glue cylinder, the other end of the extruding fork extends out a side hole of the upper central pipe or the lower central pipe, and the extending-out part is sleeved by a spring. The tail part of the extending out par of each extruding fork is provided with a piston disk, a piston sleeve sleeves the outer part of the piston disk, the piston disk is connected with the piston sleeve in sliding sealing manner, and the end part of the piston sleeve is provided with a second high-pressure soft pipe joint. The jacket-type oil casing air tightness detection device and the detection method can effectively realize air tightness detection of a small-size oil casing, and the service lifetime of the glue cylinder is effectively prolonged.
Description
Technical field
The present invention relates to the device for detecting sealability technical field of tubing and casing connecting portion screw thread, and in particular to a kind of overcoat
Formula tubing and casing air-tightness detection device and detection method.
Background technology
China's natural gas market extends rapidly, and underground natural gas storage tank is used widely.Underground natural gas storage tank storage capacity is big, pressure
Range of accommodation is big, with low cost, but injection-production well compares conventional Productivity Construction producing well to pit shaft safety, integrity demands more
Height, injection-production well run time are longer.As gas storage injection-production well operating pressure is high, pressure range is big, pit shaft security presence
Larger leakage potential safety hazard.
Due to mismachining tolerance, colliding with transport or operation process, microcorrosion and make the wrong choice of stop-leak compound tubing and casing
With torque wrench moment is unreasonable, the factor such as cleaning of box cupling and sealing surface, easily causes tubing and casing air-tightness to fail.The natural gas well
Leak in Oil Pipe in process of production, may cause oil jacket to be ganged up, pressure oscillation, affect casing safety, there is considerable safety hidden
Suffer from, later stage workover cost is huge, causes uncertain potential safety hazard to environment and society.In order to ensure completion tubular column in down-hole
Safety, to play critical seal effect tubing and casing propose higher seal request, the air-leakage test of tubing and casing screw thread is
Become the necessary means for preventing potential safety hazard.
As relatively costly hyposmosis, extra-low permeability gas field are in the gradually exploitation of China, cost of winning is advantageously reduced
The employing of slim hole well gradually popularize, matched tubing and casing caliber also accordingly reduces.It is airtight due to what is adopted at present
Property detection means be all embedded, therefore the external diameter of air-tightness detection device also needs accordingly to reduce the pipe to coordinate tubing and casing
Footpath, if air-tightness detection device is still to keep original structure under the conditions of undersized, realizes original function, it will greatly increase
Processing and manufacturing difficulty.
The content of the invention
Present invention aims to the problem that above-mentioned prior art is present, there is provided a kind of jacket-type tubing and casing air-tightness
Detection means and detection method, simple structure, detection are simple and efficient, efficiently solve asking for small size tubing and casing air-leakage test
Topic.
The present invention is achieved in that a kind of jacket-type tubing and casing air-tightness detection device, including setting successively from top to bottom
The upper end cover put, upper center tube adjust joint, lower center tube and bottom end cover, and the upper end of the upper center tube is connected with upper end cover
And connected, the lower end of the lower center tube is connected with bottom end cover and is connected, the upper center tube and lower center tube
Center offers through hole and realizes the two connection by adjusting joint connection, and the side for adjusting joint is provided with the first high pressure
Hose coupling, the upper center tube and lower center tube arrange fluted on the inwall for open up through hole, and the upper center tube is with
Central canal is provided with packing element and pressing mechanism in groove；The pressing mechanism includes being uniformly arranged on packing element periphery and one
End contact with packing element four extrudes pitches, and offers four respectively and connect with groove on the side walls of upper center tube and lower center tube
Side opening, the other end for extruding fork stretch out the side opening of upper center tube and lower center tube and are set with spring, extruding fork in extension
Piston plate is connected with the tail end of extension, the outside of piston plate is arranged with piston bush, and piston plate is with piston bush by sliding
Sealing is attached, and the end of piston bush is provided with the second high-pressure hose connector.
The characteristics of of the invention, also resides in, and extruding fork includes fork arm and extruded wall, one end of fork arm and extruded wall connection, fork arm
The other end stretch out upper center tube, the side opening of lower center tube and be connected with piston plate, extruded wall is with certain wall thickness four points
One of cylinder, packing element periphery fork arm adjacent extruded wall between be provided with gap.
The characteristics of of the invention, also resides in, and upper center tube and lower center tube are additionally provided with upper guarantor in the groove on through-hole wall
Sheath and lower protective case, upper protective case are arranged at the top of packing element, and lower protective case is arranged at the bottom of packing element.
The characteristics of of the invention, also resides in, and the upper center tube and lower center tube are provided with boss below piston bush,
Piston bush is risen and supports firm effect.
The characteristics of of the invention, also resides in, and the upper end cover passes through screw thread respectively with upper center tube, bottom end cover and lower center tube
It is attached, drop handle is installed on upper end cover, the upper protective case and lower protective case is made using rubber.
Another technical scheme that the present invention is adopted is that one kind carries out the bubble-tight detection of tubing and casing using above-mentioned detection device
Method, comprises the steps：
Step 1, the outside that detection means is placed on tubing and casing to be detected, make adjustment joint be in oil casing collar position；
Step 2, by the second high-pressure hose connector infusion high pressure liquid, liquid is after the second high-pressure hose connector and side opening
Into the chamber between piston bush and piston plate, continue pressurization, piston plate is gradually advanced under pressure, and compression spring is simultaneously pushed away
Dynamic connected extruding fork is radially moved, and extruding fork is extruded to packing element, and packing element is compressed by Radial Loads,
Make packing element fit with oil jacket pipe outer wall to set, annular sealed space is formed between oil jacket pipe outer wall and detection means；
Step 3, by the first high-pressure hose connector infusion gases at high pressure, gas enters inspection by the first high-pressure hose connector
Survey in the annular sealed space constituted by device and tubing and casing, continue pressurization, make gas pressure be promoted to detection pressure；
Step 4, gas detector is installed at the box cupling inside tubing and casing, by gas detector to tubing and casing to be measured outside
Gas detected, by detecting whether gases at high pressure are leaked judging tubing and casing air-tightness；
After the completion of step 5, detection, the high pressure gas of annular sealed space between detection means and tubing and casing are discharged into first
Body, then carries out pressure release to the chamber between piston bush and piston plate, and after pressure release, piston plate is quick in the presence of spring force
Reset, and drive extruding fork to reset, packing element resets by its own resilient, and detection means returns to original operating state；
Step 6, detection means is taken out from outside tubing and casing.
Invention has the advantages and positive effects that：
1st, the present invention is provided jacket-type tubing and casing air-tightness detection device and detection method, are placed in tubing and casing and connect during work
Hoop is outside, judges tubing and casing air-tightness by whether detected gas leak, detects simple and efficient, efficiently solves small size oil
The problem of sleeve pipe air-leakage test, while more effectively improve the service life of packing element.
2nd, tubing and casing gas tightness detection means of the invention, cost are relatively low, lightweight, are easy to scene transport, carry, inspection
Survey simple and quick, testing result sensitivity is high, reliable operation, long-time stability are high, effective detection tubing and casing gas tightness
Whether fail, it is ensured that the safety of oil and gas exploration and development process；
3rd, tubing and casing air-tightness detection method of the invention, easy to operate, hermetic seal that can conveniently and efficiently to tubing and casing
Property detected, for more accurately judging that tubing and casing gas sealing ability provides a kind of new detection approach, contribute to according to detection knot
Fruit proposes measures to rectify and reform for screw thread blow-by, it is ensured that the safety of oil and gas exploration and development process.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the arrangement sectional view of extruding fork 9, packing element 8 and piston plate 11 in Fig. 1；
In figure, 1, upper end cover, 2, upper center tube, 3, adjustment joint, 4, lower center tube, 5, bottom end cover, 6, through hole, 7, first
High-pressure hose connector, 8, packing element, 9, extruding fork, 9-1, fork arm, 9-2, extruded wall, 10, spring, 11, piston plate, 12, piston bush,
13rd, the second high-pressure hose connector, 14, upper protective case, 15, lower protective case, 16, boss, 17, drop handle, 18, tubing and casing.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, with reference to embodiments, to the present invention
It is further elaborated.
As depicted in figs. 1 and 2, a kind of jacket-type tubing and casing air-tightness detection device of the embodiment of the present invention, including from upper
The upper end cover 1 set gradually under, upper center tube 2 adjust joint 3, lower center tube 4 and bottom end cover 5, the upper end of upper center tube 2
It is connected and is connected with upper end cover 1, the lower end of lower center tube 4 is connected and is connected with bottom end cover 5, upper center tube 2 is with
The center of central canal 4 offer through hole 6 and by adjust joint 3 connection realize the two connection, upper center tube 2, it is lower in
Heart pipe 4 is threadably connected respectively with adjustment joint 3, and ensures upper center tube 2 with adjustment 3 junction of joint and lower center
The sealing of pipe 4 and 3 junction of adjustment joint, the side for adjusting joint 3 are provided with the first high-pressure hose connector 7, for high pressure
It is hose connection and for gases at high pressure are passed through the annular space between detection means and tubing and casing 18.Upper center tube 2 and lower center tube 4
Arrange fluted on the inwall for opening up through hole 6, upper center tube 2 and lower center tube 4 are provided with packing element 8 and extruding in groove
Mechanism；Pressing mechanism includes being uniformly arranged on four extruding forks 9 that 8 periphery of packing element and one end are contacted with packing element 8, upper center tube
2 and lower center tube 4 side wall on offer four side openings connected with groove respectively, on 4 side wall of upper center tube 2 and lower center tube
The side opening for opening up is uniformly distributed circumferentially respectively, and the other end of extruding fork 9 stretches out the side opening of upper center tube 2 and lower center tube 4 simultaneously
Spring 10 is set with extension, extruding fork 9 is connected with piston plate 11, the outer cover of piston plate 11 in the tail end of extension
It is provided with piston bush 12, piston plate 11 is attached by being slidingly sealed with piston bush 12, it is high that the end of piston bush 12 is provided with second
Pressure hose coupling 13, for being connected with high-pressure hose and highly pressurised liquid being imported the chamber between piston bush 12 and piston plate 11.
In embodiments of the present invention, extruding fork 9 includes fork arm 9-1 and extruded wall 9-2, one end of fork arm 9-1 and extruded wall
9-2 connects, and the other end of fork arm 9-1 is stretched out upper center tube 2, the side opening of lower center tube 4 and is connected with piston plate 11, fork arm 9-1
It is threaded connection with piston plate 11, fork arm 9-1 is matched with the side opening of upper center tube 2, lower center tube 4, it is ensured that fork arm 9-1 energy
Enough flexibly to move in side opening, extruded wall 9-2 is a quarter cylinder with certain wall thickness, and extruded wall 9-2 internal diameter is slightly less than
Packing element external diameter, is provided with gap between the adjacent extruded wall of 8 peripheral fork arm of packing element, this makes it possible to make extruding fork 9 squeeze packing element 8
During pressure, will not influence each other between adjacent extruded wall 9-2, can preferably contact 8 outer wall of packing element, so as to extrude to which.
As a prioritization scheme of the embodiment of the present invention, the groove of upper center tube 2 and lower center tube 4 on 6 inwall of through hole
Protective case 14 and lower protective case 15 are additionally provided with inside, upper protective case 14 is arranged at the top of packing element 8, and lower protective case 15 is arranged at
The bottom of packing element 8.
Used as a prioritization scheme of the embodiment of the present invention, upper center tube 2 and lower center tube 4 are all provided with the lower section of piston bush 12
Boss 16 is equipped with, to 12 support firm effects of piston bush.
As a prioritization scheme of the embodiment of the present invention, upper end cover 1 and 4 points of upper center tube 2, bottom end cover 5 and lower center tube
It is not attached by screw thread, drop handle 17 is installed on upper end cover 2, the convenient boom hoisting in operation is carried out to the detection means
Lifted and transferred, upper protective case 14 used and lower protective case 15 are made using rubber, after packing element 8 is compressed, to detection
The confined space that device and tubing and casing 18 are formed plays further sealing function, further ensures the reliability and accurately of detection
Property, while improve the service life of packing element.
The bubble-tight detection method of tubing and casing of the present invention, is entered using above-mentioned jacket-type tubing and casing air-tightness detection device
OK, specifically carry out according to above step：
Step 1, the outside that detection means is placed on tubing and casing to be detected 18, make adjustment joint 3 be in oil casing collar position
Put, it is ensured that the packing element 8 of upper center tube 2 is located at the top of box cupling, the packing element 8 of lower center tube 4 is located at the lower section of box cupling；
Step 2, by 13 infusion high pressure liquid of the second high-pressure hose connector, liquid passes through the second high-pressure hose connector 13 and side
The chamber entered between piston bush 12 and piston plate 11 behind hole, continues pressurization, and piston plate 11 is gradually advanced under pressure, presses
Contracting spring 10 simultaneously promotes connected extruding fork 9 to radially move, and extruding 9 pairs of packing elements 8 of fork are extruded, and packing element 8 is subject to footpath
Compressed to load effect, make packing element 8 fit with 18 outer wall of tubing and casing and set, the shape between 18 outer wall of tubing and casing and detection means
Circularize confined space；
Step 3, by 7 infusion gases at high pressure of the first high-pressure hose connector, gas is entered by the first high-pressure hose connector 7
In the annular sealed space constituted by detection means and tubing and casing 18, continue pressurization, make gas pressure be promoted to detection pressure；
Step 4, gas detector is installed at the box cupling inside tubing and casing 18, by gas detector to tubing and casing to be measured
18 outer gases are detected, by detecting whether gases at high pressure are leaked judging tubing and casing air-tightness；
After the completion of step 5, detection, first the annular sealed space constituted by detection means and tubing and casing 18 is let out
Pressure, discharges into the gases at high pressure of annular sealed space between detection means and tubing and casing 18, then to piston bush 12 and piston
Chamber between disk 11 carries out pressure release, the Rapid reset in the presence of 10 elastic force of spring of piston plate 11 after pressure release, and drives extruding
Fork 9 resets, and packing element 8 resets by its own resilient, and detection means returns to original operating state；
Step 6, detection means is taken out from outside tubing and casing.
In the detection method of the embodiment of the present invention, the first high-pressure hose connector 7 can be connected with high-pressure air pipe, high-pressure air pipe
It is connected with high-pressure pump, high-pressure pump infusion is detection gases at high pressure, and detection gases at high pressure can be helium nitrogen mixture gas, and the
Two high-pressure hose connectors 13 can be connected with high-pressure liquid tube, and high-pressure liquid tube is connected with high pressure liquid pump, the high pressure liquid of high pressure liquid pump infusion
Body can be water.After connecting, detection means of the present invention is hung by the drop handle 17 installed on upper end cover 2 using lifting device
Rise, be inserted in the outside of tubing and casing, you can the detection method according to the invention described above carries out the air-leakage test of tubing and casing.At this
In bright, the effect of the second high-pressure hose connector 13 is rather than the gases at high pressure for infusion highly pressurised liquid-water, and the height of infusion
Press liquid is carried out from four direction, therefore, it is possible to quick and uniformly extrude packing element 8, this makes it possible to ensure
Packing element 8 preferably can be realized setting with fitting for tubing and casing 18, and can improve the service life of packing element 8, while at this
In invention, upper center tube 2 and lower center tube 4 are additionally provided with upper protective case 14 and lower protective case in the groove on 6 inwall of through hole
15, such structure design can make packing element 8 after being compressed, the confined space that detection means and tubing and casing 18 are formed is risen
To further sealing function, reliability and the accuracy of detection is further ensured, simultaneously because the upper and lower of packing element 8 is set respectively
Protective case 14 and lower protective case 15 is equipped with, protective effect is also acted to packing element 8, therefore is also further increased making for packing element
With the life-span, whether leak accurately, reliably to judge the airtight of tubing and casing by detection gases at high pressure so as to be more conducive to the present invention
Property, it is ensured that the accuracy of air-leakage test and reliability.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (6)
1. a kind of jacket-type tubing and casing air-tightness detection device, it is characterised in that including the upper end cover for setting gradually from top to bottom
(1), upper center tube (2), adjustment joint (3), lower center tube (4) and bottom end cover (5), the upper end of upper center tube (2) with it is upper
End cap (1) connects and is connected, and the lower end of lower center tube (4) is connected and is connected with bottom end cover (5), it is described it is upper in
The center of heart pipe (2) and lower center tube (4) offers through hole (6) and realizes that the two connects by adjusting joint (3) connection
Logical, the side for adjusting joint (3) is provided with the first high-pressure hose connector (7), and upper center tube (2) and lower center tube (4) are in opening
If arranging fluted on the inwall of through hole (6), upper center tube (2) and lower center tube (4) are provided with packing element in groove
And pressing mechanism (8)；The pressing mechanism includes being uniformly arranged on four that packing element (8) periphery and one end are contacted with packing element (8)
Four side openings connected with groove are offered respectively on the side wall of individual extruding fork (9), upper center tube (2) and lower center tube (4), are squeezed
The other end of pressure fork (9) stretches out the side opening of upper center tube (2) and lower center tube (4) and is set with spring (10) in extension,
Extruding fork (9) is connected with piston plate (11) in the tail end of extension, and the outside of piston plate (11) is arranged with piston bush (12), living
Plug disk (11) is attached by being slidingly sealed with piston bush (12), and the end of piston bush (12) is provided with the second high-pressure hose connector
(13)。
2. a kind of jacket-type tubing and casing air-tightness detection device according to claim 1, it is characterised in that the extruding fork
(9) include that fork arm (9-1) and extruded wall (9-2), one end of fork arm (9-1) and extruded wall (9-2) connect, fork arm (9-1) it is another
One end is stretched out upper center tube (2), the side opening of lower center tube (4) and is connected with piston plate (11), and extruded wall (9-2) is with certain
The a quarter cylinder of wall thickness；Gap is provided between the adjacent extruded wall of packing element (8) periphery extruding fork.
3. a kind of jacket-type tubing and casing air-tightness detection device according to claim 1 and 2, it is characterised in that on described
Central canal (2) and lower center tube (4) are additionally provided with upper protective case (14) and lower protective case in the groove on through hole (6) inwall
(15), upper protective case (14) are arranged at the top of packing element (8), and lower protective case (15) are arranged at the bottom of packing element (8).
4. a kind of jacket-type tubing and casing air-tightness detection device according to claim 3, it is characterised in that the upper center
Pipe (2) and lower center tube (4) are provided with boss (16) below piston bush (12), piston bush (12) is risen and supports firm work
With.
5. a kind of jacket-type tubing and casing air-tightness detection device according to claim 4, it is characterised in that the upper end cover
(1) it is attached by screw thread with upper center tube (2), bottom end cover (5) and lower center tube (4) respectively, upper end cover is provided with (2)
Drop handle (17), upper protective case (14) and lower protective case (15) are made using rubber.
6. one kind carries out the bubble-tight detection method of tubing and casing using the arbitrary detection means of claim 1-5, and its feature exists
In comprising the steps：
Step 1, the outside that detection means is placed on tubing and casing to be detected (18), make adjustment joint (3) be in oil casing collar position
Put；
Step 2, by the second high-pressure hose connector (13) infusion high pressure liquid, liquid passes through the second high-pressure hose connector (13) and side
The chamber entered between piston bush (12) and piston plate (11) behind hole, continues pressurization, and piston plate (11) is under pressure gradually
Propulsion, compression spring (10) simultaneously promote connected extruding fork (9) to radially move, and extruding fork (9) is squeezed to packing element (8)
Pressure, packing element (8) are compressed by Radial Loads, make packing element (8) be fitted with tubing and casing (18) outer wall and set, in tubing and casing
(18) annular sealed space is formed between outer wall and detection means；
Step 3, by the first high-pressure hose connector (7) infusion gases at high pressure, gas is entered by the first high-pressure hose connector (7)
In the annular sealed space constituted by detection means and tubing and casing (18), continue pressurization, make gas pressure be promoted to detection pressure；
Step 4, gas detector is installed at the internal box cupling of tubing and casing (18), by gas detector to tubing and casing to be measured
(18) outer gas is detected, judges tubing and casing air-tightness by whether detection gases at high pressure leak；
After the completion of step 5, detection, the high pressure gas of annular sealed space between detection means and tubing and casing (18) are discharged into first
Body, then carries out pressure release to the chamber between piston bush (12) and piston plate (11), and after pressure release, piston plate (11) is in spring (10)
Rapid reset in the presence of elastic force, and drive extruding fork (9) to reset, packing element (8) resets by its own resilient, and detection means is recovered
To original operating state；
Step 6, detection means is taken out from outside tubing and casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510672683.XA CN105319020B (en) | 2015-10-16 | 2015-10-16 | Jacket-type oil casing air tightness detection device and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510672683.XA CN105319020B (en) | 2015-10-16 | 2015-10-16 | Jacket-type oil casing air tightness detection device and detection method |
Publications (2)
| Publication Number | Publication Date |
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| CN105319020A CN105319020A (en) | 2016-02-10 |
| CN105319020B true CN105319020B (en) | 2017-03-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525353B (en) * | 2016-11-18 | 2018-10-30 | 贵州望江气体有限公司 | High-pressure aerated connecting tube defect inspection method |
| CN108661622B (en) * | 2017-03-30 | 2021-11-02 | 中国石油天然气股份有限公司 | Method for testing plugging effect of waste gas well of gas storage |
| CN109297643B (en) * | 2018-12-07 | 2024-05-14 | 贵州安飞精密制造有限公司 | Pipeline sealing pressure-resistant test device |
| CN112901138A (en) * | 2019-11-17 | 2021-06-04 | 中石化石油工程技术服务有限公司 | Sleeve air-tight seal detection device |
| CN116852399B (en) * | 2023-09-05 | 2023-11-17 | 陕西能控安远智能技术有限公司 | Multipurpose explosion-proof robot |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6430990B1 (en) * | 2000-11-10 | 2002-08-13 | Ronald J. Mallet | Pipe testing apparatus |
| CN2811972Y (en) * | 2005-08-06 | 2006-08-30 | 李国民 | Sleeve leakage detector |
| CN101696898B (en) * | 2009-09-29 | 2013-02-13 | 安东石油技术（集团）有限公司 | Leak detection tool for high-pressure blocking-sealing gas injection |
| CN102418839B (en) * | 2010-09-28 | 2014-01-22 | 安东石油技术（集团）有限公司 | Sealing detection device for threads of pipe fitting in pipeline |
| CN103234712B (en) * | 2012-12-29 | 2015-07-15 | 西南石油大学 | Oil bushing air-tightness detection device and oil bushing air-tightness detection method |
| CN203476280U (en) * | 2013-09-13 | 2014-03-12 | 深圳市弗赛特检测设备有限公司 | Improved oil sleeve gas tightness detection packer |
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Effective date of registration: 20160708 Address after: No. 8 Road, Xindu Xindu District of Chengdu city of Sichuan Province in 610500 Applicant after: Southwest Petroleum University Applicant after: Drilling Engineering Technology Research Institute, China National Petroleum Corp. Address before: No. 8 Road, Xindu Xindu District of Chengdu city of Sichuan Province in 610500 Applicant before: Southwest Petroleum University |
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