CN108731922B - Test system for riser filling valve and test method thereof - Google Patents
Test system for riser filling valve and test method thereof Download PDFInfo
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- CN108731922B CN108731922B CN201810167736.6A CN201810167736A CN108731922B CN 108731922 B CN108731922 B CN 108731922B CN 201810167736 A CN201810167736 A CN 201810167736A CN 108731922 B CN108731922 B CN 108731922B
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Abstract
The invention discloses a test system for a riser filling valve and a test method for a riser system filling valve, which can overcome the defects of the existing research means, provide a test method for simulating the mechanical property of the riser filling valve under the deep water drilling working condition, and also can simulate the mechanical property of the filling valve under different working states in the deep water drilling process, so that the test can completely reflect the real working state of the filling valve, and test data obtained by the test can provide a data source for the verification of the performance of the filling valve and the optimization of the structure.
Description
Technical Field
The invention belongs to the technical field of offshore oil drilling equipment, and particularly relates to a test system for a filling valve of a marine riser, and a test method for the filling valve of the marine riser.
Background
In the deep water drilling process, the mud pressure in the riser ring is suddenly reduced sometimes, and at the moment, the huge seawater pressure can crush the whole riser system to cause hundreds of millions of yuan of loss, even cause casualties. In the whole riser system, an important component filling valve is arranged, when the riser system is in danger, the filling valve can be used for rapidly opening the valve to introduce seawater into an annular space, so that the pressure inside and outside the riser system is balanced, and the safety guarantee of the riser system is realized.
Just because of the huge effect of the filling valve, the structure of the filling valve is very complex, the requirement of a control system is higher, a test method capable of completely simulating the working of the filling valve is also lacked, only a few foreign companies produce the filling valve at present, and no related products exist in China. In recent years, a lot of breakthroughs have been made in the key technology of the filling valve in China, the product structure and the control system are produced at present, some test methods are provided for the control system, but a set of mature test methods for the complete filling valve product are not provided in China, and whether the function and the mechanical property of the filling valve can meet the design requirements under the working condition cannot be verified.
Therefore, in order to rapidly realize localization of the filling valve, a filling valve test platform is established, and a filling valve test method is necessary to be developed.
Disclosure of Invention
The invention aims to provide a test system for a riser filling valve, which is used for solving the problem that the domestic filling valve is difficult to test.
In order to achieve the purpose, the first technical scheme adopted by the invention is that the test system for the riser filling valve comprises a filling valve, wherein the filling valve comprises a valve shell, a valve body is arranged in the valve shell, a sliding sleeve, an oil cylinder for driving the sliding sleeve to move, a control valve for controlling the oil cylinder to move and an energy accumulator connected with the control valve are arranged on the valve body, a plurality of strain gauges are arranged on the valve body, and each strain gauge is connected with a data acquisition computer; the filling valve is arranged in the high-pressure bin, a hydraulic pump station is arranged outside the high-pressure bin, two ends of the high-pressure bin are respectively provided with a stretching device, the driving ends of the two stretching devices respectively extend into the high-pressure bin in a telescopic manner and are connected with two ends of the filling valve, sealing parts are respectively arranged between the two driving ends and the high-pressure bin, a first interface is arranged on the high-pressure bin, a first pressure gauge, a first one-way valve and an external pressure pump are sequentially connected between the first interface and the hydraulic pump station, and a first overflow valve is connected between the inlet of the first one-way valve and the hydraulic pump station; a second interface is arranged on the valve shell, a first accumulator group, a first stop valve, a second pressure gauge, a second one-way valve and an internal pressure pump are sequentially connected between the second interface and the hydraulic pump station, and a second overflow valve is connected between an outlet of the second one-way valve and the hydraulic pump station; the control valve is divided into three paths, a second stop valve, a second accumulator group, a third pressure gauge and a third overflow valve are sequentially connected between the first path and the hydraulic pump station, a third stop valve is sequentially connected between the second path and the hydraulic pump station, a fourth pressure gauge, a third check valve and an execution pump are sequentially connected between the second path and the hydraulic pump station, a fourth stop valve is connected between the inlet of the second stop valve and the inlet of the third stop valve, a fourth overflow valve is connected between the outlet of the third check valve and the hydraulic pump station, a reversing valve, the third accumulator group, a fifth stop valve, a fifth pressure gauge, the fourth check valve and a remote control pump are sequentially connected between the third path and the hydraulic pump station, and a fifth overflow valve is arranged between the inlet of the fourth check valve and the hydraulic pump station.
The first technical scheme adopted by the invention also has the following characteristics:
the sealing element is a sealing packing, the sealing packing is made of elastic materials, and an inflation connector is arranged on the sealing packing.
The stretching device is a tension oil cylinder.
The end part of the driving end is provided with a first blind flange, and two ends of the filling valve are respectively provided with a second blind flange.
The second purpose of the invention is to provide a test method of a riser system filling valve, which is realized based on the first technical scheme of the invention and is used for solving the problem that the domestic filling valve is difficult to test.
In order to achieve the second object of the present invention, a second technical solution adopted by the present invention is a method for testing a riser system filling valve, which is implemented according to the following steps:
step 1, preparation before testing:
1.1, starting an internal pressure pump, opening a second overflow valve, setting the outlet pressure of a first accumulator group, completing internal pressure loading of a filling valve, and simulating internal pressure generated by slurry on the filling valve;
step 1.2, loosening the third overflow valve, closing the second stop valve and the third stop valve, starting the execution pump, gradually increasing the pressure of the second accumulator group, and closing the execution pump and the fourth stop valve when the pressure is increased to a set parameter, so that the second accumulator group completes back pressure;
step 1.3, loosening the fourth overflow valve, opening the third stop valve, starting the execution pump, gradually increasing the pressure of the energy accumulator at the moment, and finishing the back pressure of the energy accumulator when the pressure reaches a set parameter;
step 1.4, loosening the first overflow valve and starting the external pressure pump to finish external pressure loading of the filling valve, wherein the external pressure loading is used for simulating external pressure generated by seawater on the filling valve;
step 2.1, the mechanical property test when the filling valve is automatically opened and closed under the state that the external hydraulic source provides oil liquid: rotating the second overflow valve to reduce the outlet pressure of the first accumulator group and the inner pressure pump, and then actuating the oil cylinder of the filling valve and opening the valve; the second overflow valve is rotated reversely, the outlet pressure of the first accumulator group and the outlet pressure of the inner pressure pump are increased, at the moment, the oil cylinder of the filling valve acts, and the valve is closed;
step 2.2, mechanical property test when the filling valve is opened and closed remotely under the state that the external hydraulic source provides oil liquid: starting the remote control pump, rotating the fifth overflow valve to maintain the pressure at a required parameter, and completing pressure storage of the third accumulator group; operating the reversing valve, starting the remote control oil supply loop, and starting the oil cylinder of the filling valve at the moment; reversely operating the reversing valve, closing the remote control oil supply loop, and closing the valve when the oil cylinder of the filling valve acts;
step 2.3, when the energy accumulator provides an oil source, the mechanical property test when the filling valve is automatically opened and closed is as follows: closing the execution pump, closing the third stop valve and separating the external hydraulic source from the system; rotating the second overflow valve to reduce the outlet pressure of the first accumulator group and the inner pressure pump, and then actuating the oil cylinder of the filling valve and opening the valve; the second overflow valve is rotated reversely, the outlet pressure of the first accumulator group and the outlet pressure of the inner pressure pump are increased, at the moment, the oil cylinder of the filling valve acts, and the valve is closed;
step 2.4, when the energy accumulator provides an oil source, the mechanical property test when the filling valve is opened and closed remotely: closing the execution pump, closing the third stop valve and separating the external hydraulic source from the system; starting the remote control pump, and rotating the fifth overflow valve to maintain the pressure at a required parameter; operating the reversing valve, starting the remote control oil supply loop, and starting the oil cylinder of the filling valve at the moment; reversely operating the reversing valve, closing the remote control oil supply loop, and closing the valve when the oil cylinder of the filling valve acts;
and 3, analyzing the data signal transmitted by the strain gauge when the test is carried out in the step 2 by a data acquisition computer.
The invention has the beneficial effects that: (1) the invention can overcome the defects of the existing research means and provides a test method for simulating the mechanical property of the riser filling valve under the deep water drilling working condition; (2) the device and the method can simulate the mechanical property of the filling valve in different working states in the deepwater drilling process, the test can completely reflect the real working state of the filling valve, and the test data obtained by the test can provide a data source for the verification of the performance and the optimization of the structure of the filling valve.
Drawings
Fig. 1 is a schematic diagram of a test system for a riser filling valve according to the invention.
In the figure, 1, an internal pressure pump, 2, a second check valve, 3, a second overflow valve, 4, a second pressure gauge, 5, a first stop valve, 6, a first accumulator set, 7, a third overflow valve, 8, a second accumulator set, 9, a second stop valve, 10, a fourth stop valve, 11, a third pressure gauge, 12, a third stop valve, 13, a fourth overflow valve, 14, an execution pump, 15, a third check valve, 16, a fourth pressure gauge, 17, a fifth stop valve, 18, a third accumulator set, 19, a reversing valve, 20, a fifth pressure gauge, 21, a fourth check valve, 22, a fifth overflow valve, 23, a remote control pump, 24, a first overflow valve, 25, an external pressure pump, 26, a first check valve, 27, a first pressure gauge, 28, a hydraulic pump station, 29, a stretching device, 30, a sealing element, 31, a first blind flange, 32, a second blind flange, 33, a valve body, 34. control valve, 35 strain gauge, 36 valve body, 37 high-pressure chamber, 38 data acquisition computer, 39 accumulator.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the testing system for the riser filling valve of the present invention comprises a filling valve, wherein the filling valve comprises a valve housing 33, a valve body 36 is arranged in the valve housing 33, a sliding sleeve, an oil cylinder for driving the sliding sleeve to move, a control valve 34 for controlling the oil cylinder to move, and an energy accumulator 39 connected with the control valve 34 are arranged on the valve body 36, a plurality of strain gauges 35 are arranged on the surface of the valve body 36, and each strain gauge 35 is connected with a data acquisition computer 38; the hydraulic filling device is characterized by further comprising a high-pressure bin 37, the filling valve is arranged in the high-pressure bin 37, a hydraulic pump station 28 is arranged outside the high-pressure bin 37, two ends of the high-pressure bin 37 are respectively provided with a stretching device 29, driving ends of the two stretching devices 29 respectively extend into the high-pressure bin 37 in a telescopic mode and are connected with two ends of the filling valve, sealing parts 30 are respectively arranged between the two driving ends and the high-pressure bin 37, a first interface is arranged on the high-pressure bin 37, a first pressure gauge 27, a first check valve 26 and an external pressure pump 25 are sequentially connected between the first interface and the hydraulic pump station 28, and a first overflow valve 24 is connected between an inlet of the first check valve 26 and the; a second interface is arranged on the valve shell 33, a first accumulator group 6, a first stop valve 5, a second pressure gauge 4, a second one-way valve 2 and an internal pressure pump 1 are sequentially connected between the second interface and the hydraulic pump station 28, and a second overflow valve 3 is connected between the outlet of the second one-way valve 2 and the hydraulic pump station 28; the control valve 34 is divided into three paths, a second stop valve 9, a second accumulator group 8, a third pressure gauge 11 and a third overflow valve 7 are sequentially connected between the first path and the hydraulic pump station 28, a third stop valve 12, a fourth pressure gauge 16, a third one-way valve 15 and an execution pump 14 are sequentially connected between the second path and the hydraulic pump station 28, a fourth stop valve 10 is connected between the inlet of the second stop valve 9 and the inlet of the third stop valve 12, a fourth overflow valve 13 is connected between the outlet of the third one-way valve 12 and the hydraulic pump station 28, a reversing valve 19, a third accumulator group 18, a fifth stop valve 17, a fifth pressure gauge 20, a fourth one-way valve 21 and a remote control pump 23 are sequentially connected between the third path and the hydraulic pump station 28, and a fifth overflow valve 22 is arranged between the inlet of the fourth one-way valve 21 and the hydraulic pump station 28.
As shown in fig. 1, the sealing element 30 is a sealing packing made of an elastic material, and an inflation port is arranged on the sealing packing; the stretching device 29 is a tension oil cylinder, a first blind flange 31 is arranged at the end part of the driving end of the oil cylinder, second blind flanges 32 are respectively arranged at the two ends of the filling valve, and the first blind flange 31 and the second blind flanges 32 are fixedly connected through a plurality of bolts.
The invention discloses a test method of a filling valve of a riser system, which is realized by using the test system for the filling valve of the riser system and is implemented according to the following steps:
step 1, preparation before testing:
step 1.1, starting an internal pressure pump 1, opening a second overflow valve 3, setting outlet pressure of a first energy accumulator group 6, completing internal pressure loading of a filling valve, and simulating internal pressure generated by mud on the filling valve;
step 1.2, loosening the third overflow valve 7, closing the second stop valve 9 and the third stop valve 12, starting the execution pump 14, gradually increasing the pressure of the second energy accumulator group 8, closing the execution pump 14 and the fourth stop valve 10 when the pressure is increased to a set parameter, and finishing the back pressure of the second energy accumulator group 8;
step 1.3, loosening the fourth overflow valve 13, opening the third stop valve 12, starting the execution pump 14, gradually increasing the pressure of the energy accumulator 39 at the moment, and finishing the back pressure of the energy accumulator 39 when the pressure reaches a set parameter;
step 1.4, loosening the first overflow valve 24 and starting the external pressure pump 25 to finish external pressure loading of the filling valve, wherein the external pressure loading is used for simulating external pressure generated by seawater on the filling valve;
step 2.1, the mechanical property test when the filling valve is automatically opened and closed under the state that the external hydraulic source provides oil liquid: rotating the second overflow valve 3 to reduce the outlet pressure of the first accumulator group 6 and the internal pressure pump 1, and then actuating the oil cylinder of the filling valve to open the valve; reversely rotating the second overflow valve 3, increasing the outlet pressure of the first accumulator group 6 and the internal pressure pump 1, and closing the valve when the oil cylinder of the filling valve acts;
step 2.2, mechanical property test when the filling valve is opened and closed remotely under the state that the external hydraulic source provides oil liquid: starting the remote control pump 23, rotating the fifth overflow valve 22 to maintain the pressure at a required parameter, and completing pressure storage of the third accumulator group 18; operating the reversing valve 19, starting the remote control oil supply loop, and then actuating the oil cylinder of the filling valve and opening the valve; reversely operating the reversing valve 19, closing the remote control oil supply loop, and at the moment, actuating the oil cylinder of the filling valve and closing the valve;
step 2.3, when the energy accumulator 39 provides an oil source, the mechanical property test when the filling valve is automatically opened and closed is as follows: closing the execution pump 14, closing the third stop valve 12 and disconnecting the external hydraulic pressure source from the system; rotating the second overflow valve 3 to reduce the outlet pressure of the first accumulator group 6 and the internal pressure pump 1, and then actuating the oil cylinder of the filling valve to open the valve; reversely rotating the second overflow valve 3, increasing the outlet pressure of the first accumulator group 6 and the internal pressure pump 1, and closing the valve when the oil cylinder of the filling valve acts;
step 2.4, when the energy accumulator 39 provides an oil source, the mechanical property test of the filling valve during remote opening and closing is as follows: closing the execution pump 14, closing the third stop valve 12 and disconnecting the external hydraulic pressure source from the system; starting the remote control pump 23, rotating the fifth overflow valve 22, and maintaining the pressure at a required parameter; operating the reversing valve 19, starting the remote control oil supply loop, and then actuating the oil cylinder of the filling valve and opening the valve; reversely operating the reversing valve 19, closing the remote control oil supply loop, and at the moment, actuating the oil cylinder of the filling valve and closing the valve;
and 3, analyzing the data signal transmitted by the strain gauge 35 when the test is carried out in the step 2 by a data acquisition computer.
In conclusion, the invention can overcome the defects of the existing research means and provides a test method for simulating the mechanical property of the riser filling valve under the deep water drilling working condition; the invention can also simulate the mechanical property of the filling valve in different working states in the deepwater drilling process, the test can completely reflect the real working state of the filling valve, and the test data obtained by the test can provide a data source for the verification of the performance and the optimization of the structure of the filling valve.
Claims (5)
1. A test system for a riser filling valve comprises a filling valve, wherein the filling valve comprises a valve casing (33), a valve body (36) is arranged in the valve casing (33), a sliding sleeve, an oil cylinder for driving the sliding sleeve to move, a control valve (34) for controlling the oil cylinder to move and an energy accumulator (39) connected with the control valve (34) are arranged on the valve body (36), and the test system is characterized in that a plurality of strain gauges (35) are arranged on the surface of the valve body (36), and each strain gauge (35) is connected with a data acquisition computer (38); the automatic filling device is characterized by further comprising a high-pressure bin (37), the filling valve is arranged in the high-pressure bin (37), a hydraulic pump station (28) is arranged outside the high-pressure bin (37), two ends of the high-pressure bin (37) are respectively provided with a stretching device (29), the driving ends of the two stretching devices (29) respectively extend into the high-pressure bin (37) in a telescopic mode and are connected with two ends of the filling valve, sealing parts (30) are respectively arranged between the two driving ends and the high-pressure bin (37), a first interface is arranged on the high-pressure bin (37), a first pressure gauge (27), a first check valve (26) and an external pressure pump (25) are sequentially connected between the first interface and the hydraulic pump station (28), and a first overflow valve (24) is connected between the inlet of the first check valve (26) and the hydraulic; a second interface is arranged on the valve shell (33), a first energy accumulator group (6), a first stop valve (5), a second pressure gauge (4), a second one-way valve (2) and an internal pressure pump (1) are sequentially connected between the second interface and the hydraulic pump station (28), and a second overflow valve (3) is connected between an outlet of the second one-way valve (2) and the hydraulic pump station (28); the control valve (34) is divided into three paths, a second stop valve (9), a second energy accumulator group (8), a third pressure gauge (11) and a third overflow valve (7) are sequentially connected between the first path and the hydraulic pump station (28), a third stop valve (12), a fourth pressure gauge (16), a third one-way valve (15) and an execution pump (14) are sequentially connected between the second path and the hydraulic pump station (28), a fourth stop valve (10) is connected between an inlet of the second stop valve (9) and an inlet of the third stop valve (12), a fourth overflow valve (13) is connected between an outlet of the third one-way valve (12) and the hydraulic pump station (28), a reversing valve (19), a third energy accumulator group (18), a fifth stop valve (17), a fifth pressure gauge (20), a fourth one-way valve (21) and a remote control pump (23) are sequentially connected between the third path and the hydraulic pump station (28), a fifth overflow valve (22) is arranged between the inlet of the fourth one-way valve (21) and the hydraulic pump station (28).
2. The testing system for riser filling valves according to claim 1, wherein the sealing element (30) is a sealing packing made of an elastic material and provided with an inflation port.
3. Testing system for riser filling valves according to claim 1, characterized in that the stretching means (29) is a tension cylinder.
4. Test system for riser filling valves according to claim 1, characterized in that the end of the driving end is provided with a first blind flange (31) and the two ends of the filling valve are provided with a second blind flange (32), respectively.
5. A method for testing a riser system filling valve, which is implemented by a testing system based on the riser filling valve of any one of claims 1 to 4, is characterized by being implemented by the following steps:
step 1, preparation before testing:
1.1, starting an internal pressure pump (1), opening a second overflow valve (3), setting the outlet pressure of a first energy accumulator group (6), and completing internal pressure loading of a filling valve for simulating internal pressure generated by mud on the filling valve;
step 1.2, loosening a third overflow valve (7), closing a second stop valve (9) and a third stop valve (12), starting an execution pump (14), gradually increasing the pressure of a second energy accumulator set (8), closing the execution pump (14) and a fourth stop valve (10) when the pressure is increased to a set parameter, and finishing back pressure of the second energy accumulator set (8);
step 1.3, loosening the fourth overflow valve (13), opening the third stop valve (12), starting the execution pump (14), gradually increasing the pressure of the energy accumulator (39), and finishing the back pressure of the energy accumulator (39) when the pressure reaches a set parameter;
step 1.4, loosening a first overflow valve (24) and starting an external pressure pump (25) to finish external pressure loading of the filling valve, wherein the external pressure loading is used for simulating external pressure generated by seawater on the filling valve;
step 2, after the preparation before the test in the step 1 is finished, the following tests are carried out:
step 2.1, the mechanical property test when the filling valve is automatically opened and closed under the state that the external hydraulic source provides oil liquid: rotating the second overflow valve (3) to reduce the outlet pressure of the first accumulator group (6) and the inner pressure pump (1), and then actuating the oil cylinder of the filling valve to open the valve; reversely rotating the second overflow valve (3), increasing the outlet pressure of the first accumulator group (6) and the inner pressure pump (1), and closing the valve when the oil cylinder of the filling valve acts;
step 2.2, mechanical property test when the filling valve is opened and closed remotely under the state that the external hydraulic source provides oil liquid: starting a remote control pump (23), rotating a fifth overflow valve (22), maintaining the pressure at a required parameter, and completing pressure storage of a third accumulator group (18); operating the reversing valve (19), and opening the remote control oil supply loop, wherein the oil cylinder of the filling valve acts at the moment, and the valve is opened; reversely operating the reversing valve (19), closing the remote control oil supply loop, actuating the oil cylinder of the filling valve at the moment, and closing the valve;
step 2.3, when the energy accumulator (39) provides an oil source, the mechanical property test of the filling valve when the filling valve is automatically opened and closed is as follows: closing the execution pump (14), closing the third stop valve (12) and enabling the external hydraulic pressure source to be separated from the system; rotating the second overflow valve (3) to reduce the outlet pressure of the first accumulator group (6) and the inner pressure pump (1), and then actuating the oil cylinder of the filling valve to open the valve; reversely rotating the second overflow valve (3), increasing the outlet pressure of the first accumulator group (6) and the inner pressure pump (1), and closing the valve when the oil cylinder of the filling valve acts;
step 2.4, when the energy accumulator (39) provides an oil source, the mechanical property test of the filling valve when the filling valve is opened and closed remotely: closing the execution pump (14), closing the third stop valve (12) and enabling the external hydraulic pressure source to be separated from the system; starting a remote control pump (23), rotating a fifth overflow valve (22) and maintaining the pressure at a required parameter; operating the reversing valve (19), and opening the remote control oil supply loop, wherein the oil cylinder of the filling valve acts at the moment, and the valve is opened; reversely operating the reversing valve (19), closing the remote control oil supply loop, actuating the oil cylinder of the filling valve at the moment, and closing the valve;
and 3, analyzing the data signal transmitted by the strain gauge (35) when the test is carried out in the step 2 by a data acquisition computer.
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| US7347859B2 (en) * | 2003-12-18 | 2008-03-25 | Boston Scientific, Scimed, Inc. | Tissue treatment system and method for tissue perfusion using feedback control |
| US9550971B2 (en) * | 2009-04-14 | 2017-01-24 | Therapeutic Proteins International, LLC | Universal bioreactors and methods of use |
| CN102175437B (en) * | 2011-01-14 | 2012-08-15 | 天津大学 | Buckling test device for deepwater submarine conduit |
| CN102747970B (en) * | 2012-07-17 | 2015-01-21 | 宝鸡石油机械有限责任公司 | Automatic control system of filling valve of marine drilling riser |
| CN103244699B (en) * | 2013-04-25 | 2017-03-15 | 甘肃蓝科石化高新装备股份有限公司 | Ultra-high pressure high flow topping up or pouring valve |
| CN103742466B (en) * | 2013-12-02 | 2017-05-31 | 成都欧迅科技股份有限公司 | Hyperbaric cabin hydraulic control system |
| CN103994126B (en) * | 2014-04-03 | 2016-06-22 | 北京工业大学 | A kind of open type seawater hydraulic system test method under the simulated environment of deep-sea |
| BR112017014821A2 (en) * | 2015-01-30 | 2018-01-09 | Hydril Usa Distrib Llc | hydraulic control systems, underwater bop and method of firing a bop function |
| CN104847305B (en) * | 2015-06-08 | 2019-03-12 | 成都欧迅科技股份有限公司 | A kind of novel high-strength marine drilling platform sleeve type marine riser pouring valve |
| CN105005219A (en) * | 2015-06-08 | 2015-10-28 | 成都欧迅海洋工程装备科技有限公司 | Remote control system for marine drilling platform riser fill-up valve |
| CN104863543B (en) * | 2015-06-08 | 2018-06-26 | 成都欧迅科技股份有限公司 | A kind of marine riser pouring valve for having structure and operating status self-checking function |
| CN206360685U (en) * | 2016-12-01 | 2017-07-28 | 成都欧迅科技股份有限公司 | A kind of marine drilling irrigates valve control system with deep-sea marine riser |
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Effective date of registration: 20230303 Address after: No. 3, Chengji Road, Longtan Industrial Park, Section 2, East Third Ring Road, Chenghua District, Chengdu, Sichuan 610000 Patentee after: Chengdu Guoke Testing Technology Co.,Ltd. Address before: 721002 No.2 Dongfeng Road, Jintai District, Baoji City, Shaanxi Province Patentee before: BAOJI OILFIELD MACHINERY Co.,Ltd. |
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