CN112345164A - Novel calibration rubber plug for casing sealing test - Google Patents
Novel calibration rubber plug for casing sealing test Download PDFInfo
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- CN112345164A CN112345164A CN202011206196.1A CN202011206196A CN112345164A CN 112345164 A CN112345164 A CN 112345164A CN 202011206196 A CN202011206196 A CN 202011206196A CN 112345164 A CN112345164 A CN 112345164A
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- fixedly connected
- rubber plug
- groove
- sealing test
- casing sealing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/022—Test plugs for closing off the end of a pipe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/007—Leak detector calibration, standard leaks
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- Pipe Accessories (AREA)
Abstract
The invention discloses a novel calibration rubber plug for casing sealing test, which comprises a rubber plug top, wherein the bottom end of the rubber plug top is fixedly connected with a threaded block, the middle part of the top end of the rubber plug top is fixedly connected with a groove A, the inside of the groove A is slidably connected with a movable block A, the left side end of the movable block A is fixedly connected with a groove B, the inside of the groove B is slidably connected with a movable block B, the left side end of the movable block B is fixedly connected with a connecting rod, the right side of the top end of the rubber plug top is fixedly connected with a supporting plate, the middle part of the top end of the supporting plate is fixedly connected with an open groove, the left side and the right side of the inside of the open groove are fixedly connected with slide rails, the surfaces of the slide rails are slidably connected with slide blocks, a buffer plate, and the sleeve pipe is convenient to disassemble, so that the calibration of the sleeve pipe sealing test is more convenient to carry out.
Description
Technical Field
The invention relates to a calibration rubber plug, in particular to a novel calibration rubber plug for a casing sealing test.
Background
The butyl rubber bottle stopper has good intrinsic cleanliness, chemical stability, air tightness and biological performance, but the compatibility problem of the rubber stopper and medicines is generated due to the complex formula and the relation of the concentration gradient of added raw materials, and the compatibility problem of the rubber stopper and the medicines is generated by the absorption, adsorption, leaching and permeation of some medicines with stronger molecular activity after being packaged, and the more prominent are part of cephalosporins, part of large infusion solutions, more traditional Chinese medicine injection preparations and the like. Therefore, the inert soft coating is selected to cover the surface of the rubber plug and isolate the direct contact between the medicine and the rubber plug, so that the compatibility with the medicine can be obviously improved. All medicinal rubber plugs (including rubber plugs for various dosage forms such as transfusion, oral liquid and the like) stop using common natural rubber plugs uniformly from the state to the end of 2004; butyl rubber plug sleeves are used for medicine rubber plugs in pharmaceutical factories and are generally used in building basements for protecting pipelines or facilitating iron rings for pipeline installation. The casing pipe is divided into a rigid casing pipe and a flexible waterproof casing pipe. The invention discloses a seamless steel tube for a casing and an oil tube for an oil well, and relates to a novel calibration rubber plug for casing sealing test.
Patent numbers: CN102251755A discloses a vibration excitation rubber plug, which has been studied in relation to the vibration cementing technology in the drilling engineering since a long time abroad, and the former Soviet Union Hair-blacking Petroleum research institute has proved through experiments that when the vibration excitation frequency is 20 Hz to 175 Hz, the cement strength can be improved by fifteen percent to twenty percent no matter the vibration strength, and the vibration excitation rubber plug can be successfully used in nearly one hundred wells of five oil fields; the American Dale Dusterhoft and CTES company places a pressure measuring instrument outside a casing, and proves that cement paste in a well can keep a low-speed movement by applying proper low-frequency hydraulic pulse on a wellhead after well cementation; on-board vibratory equipment was developed by Trican oil well service, canada. The research and development of the vibration well cementation technology in China is rapid, from the research of Daqing drilling institute and technical service company in 1992 on the hydraulic pulse casing shoe, field tests of hundreds of oil wells are carried out by the hydraulic pulse generator of Liaohe oil field drilling company in 1998, the percent of pass is ninety-nine, and the percent of quality is ninety-four. From the current state of research at home and abroad, it is found that the effectiveness and applicability of the vibration well cementation technology are improved, and various new technologies and new processes are developed, such as wellhead vibration equipment, a shaft bottom pulse device, a borehole magnetoelectric vibration exciter and the like, which form an unprecedented development situation, however, in order to solve the problem of vibration response of drilling fluid and cementing fluid in the well cementation process, energy for realizing long-distance vibration wave propagation needs to be used, or instrument devices need to be installed in the processes of casing setting, cement injection and the like, the defects of large energy consumption, complex structure, high cost, poor operability and implementation and the like of the applied vibration equipment become trawl stones which obstruct the technological progress and development, the invention has reasonable and compact structure and convenient use, and the vibration exciter is combined with a well cementation rubber plug, and the casing string is excited by vibration to form damping resonance to carry out dynamic vibration well cementation in the process, can effectively prevent stratum fluid from entering, improve the interface and cement bond strength, obviously improve the well cementation quality, and has the characteristics of simple structure, low cost and energy consumption and convenient field operation and use
However, the above patents have some disadvantages: 1. the above design has no buffer structure and is easily crushed by a heavy object, so improvement is needed. 2. Above-mentioned design is when dismantling, if the plug installation during too tight, is difficult to be dismantled from the sleeve pipe to inconvenient calibration of carrying out novel sleeve pipe seal test, so need improve.
Disclosure of Invention
The invention provides a novel calibration rubber plug for a casing sealing test, which is provided with a cache structure, can well prevent a rubber plug from being crushed by a heavy object, is convenient to detach from a casing, is more convenient to calibrate the casing sealing test, and can effectively solve the problems in the background art.
The specific technical scheme provided by the invention is as follows:
the invention provides a novel calibration rubber plug for casing sealing tests, which comprises a rubber plug top, wherein a threaded block is fixedly connected to the bottom end of the rubber plug top, a groove A is fixedly connected to the middle part of the top end of the rubber plug top, a moving block A is slidably connected inside the groove A, a groove B is fixedly connected to the left side end of the moving block A, a moving block B is slidably connected inside the groove B, a connecting rod is fixedly connected to the left side end of the moving block B, a supporting plate is fixedly connected to the right side of the top end of the rubber plug top, an open groove is fixedly connected to the middle part of the top end of the supporting plate, sliding rails are fixedly connected to the left side and the right side inside of the open groove, sliding blocks are slidably connected to the surfaces of the sliding rails, a buffer plate.
Optionally, the bottom end of the thread block is fixedly connected with a mounting block.
Optionally, the top end of the connecting rod is fixedly connected with a handle.
Optionally, the left side and the right side of the top end of the groove A are fixedly connected with baffle plates A.
Optionally, the left side and the right side of the top end of the groove B are fixedly connected with baffle plates B.
Optionally, a buffer rubber is fixedly installed between the bottom end of the buffer plate and the bottom end of the inside of the open slot.
Optionally, a hydraulic rod is fixedly mounted on both sides of the open slot between the bottom end of the protection plate and the top end of the support plate, and a spring is fixedly mounted on the outer side wall of the hydraulic rod.
The invention has the following beneficial effects:
1. the invention aims at the opening on the sleeve pipe by the mounting block, then inserts the mounting block into the opening of the sleeve pipe, at the moment, the thread block just props against the upper part of the opening, at the moment, clockwise rotates the rubber plug top (the rubber plug top is made of stainless steel material, the lower part of the rubber plug top is made of butyl rubber), the thread block is clamped into the opening (the opening is internally provided with threads corresponding to the thread block), the installation of the rubber plug can be completed, after the installation is completed, when a heavy object presses the rubber plug downwards, the protective plate can completely protect the rubber plug, the heavy object presses the protective plate firstly, the protective plate drives the support rod to move downwards, the support rod drives the buffer plate to move downwards, the buffer plate drives the slide block to move downwards, the slide block slides downwards along the slide rail, thereby the buffer rubber between the bottom end of the buffer plate and the bottom end in the opening, can play fine buffer memory effect, and the in-process of protection shield downstream, also can extrude the hydraulic stem, the hydraulic stem begins to shrink, thereby drive the shrink of spring, the spring utilizes its elasticity also can play fine buffer memory effect, can carry out the buffer memory to pressure like this, thereby can fine protection plug, prevent that the plug from being crushed or pressing into the cover intraductal difficult taking out, after the pressure disappearance of heavy object, the elastic energy of spring prevents that the hydraulic stem from recovering to original height, thereby drive the protection shield and recover to original height, buffer memory rubber utilizes the ductility of rubber, also can recover original shape rapidly, can effectively solve not have buffer memory structure in the solution background art, the problem of being crushed by the heavy object easily.
2. When the rubber plug is tightly installed, the rubber plug is difficult to rotate by normal bare hands, so that the rubber plug cannot be taken down, the connecting rod is pulled by the handle to move leftwards, the connecting rod drives the moving block B to move leftwards, the moving block B moves leftwards along the groove B, when the moving block B abuts against the baffle B, the moving block B is clamped by the baffle B and is prevented from separating from the groove B, then when the handle is pulled leftwards, the groove B is pulled to move leftwards, the groove B drives the moving block A to move leftwards (the cross section of the moving block A is the same as that of the inside of the groove A, so that the moving block A can move leftwards along the groove A, the moving block A can be abutted by the baffle A when the moving block A abuts against the baffle A, the moving block A is prevented from separating from the groove A, and a long rod (formed between the handle and the middle part of the top end of the rubber plug and the groove A, The pole that recess B and connecting rod constitute), because the lever theorem, the power arm is more laborsaving longer, just so can be through rotating the handle, light rotation that drives the plug, take off the plug from the sleeve pipe, it is very convenient, after the use is accomplished, can promote moving of handle right, promote the original position with the handle, thereby shorten the pole, occupation space does not, the plug is conveniently dismantled like this, more conveniently carry out novel sealed test calibration of sleeve pipe, can effectively solve when dismantling in the background art, if the plug installs when tight, hardly dismantle from the sleeve pipe, thereby the inconvenient problem of carrying out novel sealed test calibration of sleeve pipe.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an overall structure of a calibration rubber plug for a novel casing sealing test according to an embodiment of the present invention;
fig. 2 is an enlarged view of the structures of a moving block a and a moving block B in the calibration rubber plug for the novel casing sealing test according to the embodiment of the invention;
fig. 3 is an enlarged view of a connection structure of a slide block and a slide rail in a calibration rubber plug for a novel casing sealing test according to an embodiment of the present invention.
In the figure: 1. pushing the rubber plug; 2. a thread block; 3. mounting blocks; 4. a groove A; 5. moving block A; 6. a groove B; 7. a baffle A; 8. a moving block B; 9. a connecting rod; 10. a baffle B; 11. a handle; 12. a support plate; 13. an open slot; 14. a slide rail; 15. a slider; 16. a cache board; 17. caching rubber; 18. a support bar; 19. a protection plate; 20. a hydraulic lever; 21. a spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The calibration rubber plug for the novel casing sealing test according to the embodiment of the invention will be described in detail with reference to fig. 1 to 3.
Referring to fig. 1, 2 and 3, the invention provides a calibration rubber plug for a casing sealing test, which comprises a rubber plug top 1, the bottom end of the rubber plug top 1 is fixedly connected with a thread block 2, the middle part of the top end of the rubber plug top 1 is fixedly connected with a groove A4, the inner part of the groove A4 is connected with a moving block A5 in a sliding way, a groove B6 is fixedly connected with the left end of the moving block A5, a moving block B8 is connected with the inner part of the groove B6 in a sliding manner, a connecting rod 9 is fixedly connected with the left end of the moving block B8, the right side of the top end of the rubber plug top 1 is fixedly connected with a supporting plate 12, the middle part of the top end of the supporting plate 12 is fixedly connected with an open slot 13, the left side and the right side of the inside of the opening groove 13 are both fixedly connected with a slide rail 14, the surface of the slide rail 14 is connected with a slide block 15 in a sliding way, a buffer plate 16 is fixedly connected between the sliding blocks 15, a supporting rod 18 is fixedly connected to the top end of the buffer plate 16, and a protective plate 19 is fixedly connected to the top end of the supporting rod 18.
Referring to fig. 1, the bottom end of the thread block 2 is fixedly connected with a mounting block 3, and the mounting block 3 can be inserted into an opening on a sleeve in advance, so that the mounting of the thread block 2 is facilitated.
Referring to fig. 1, the top end of the connecting rod 9 is fixedly connected with a handle 11, and the handle 11 facilitates rotation of the rubber plug.
Referring to fig. 1, the left side and the right side of the top end of the groove a4 are fixedly connected with the baffle plate a7, the baffle plate a7 can well prevent the moving block a7 from sliding out of the groove a,
referring to fig. 1, the left side and the right side of the top end of the groove B6 are fixedly connected with the baffle B10, and the baffle B10 can well prevent the moving block B8 from sliding out of the groove B6.
Referring to fig. 1, a buffer rubber 17 is fixedly installed between the bottom end of the buffer plate 16 and the bottom end inside the open slot 13, and the buffer rubber 17 can play a good buffer role by using the elasticity of rubber.
Referring to fig. 1, a hydraulic rod 20 is fixedly installed on both sides of the open slot 13 between the bottom end of the protection plate 19 and the top end of the support plate 12, a spring 21 is fixedly installed on the outer side wall of the hydraulic rod 20, and the spring 21 plays roles of buffering and resetting by utilizing the elastic energy of the spring 21.
The embodiment of the invention provides a novel calibration rubber plug for a sleeve sealing test, wherein an installation block 3 is aligned to an opening on a sleeve, then the installation block 3 is inserted into the opening of the sleeve, at the moment, a thread block 2 just props against the upper part of the opening, at the moment, a rubber plug top 1 (the rubber plug top 1 is made of stainless steel materials, and the structure below the rubber plug top 1 is made of butyl rubber) is rotated clockwise, the thread block 2 is clamped into the opening (threads corresponding to the thread block 2 are arranged inside the opening), the installation of the rubber plug can be completed, when a heavy object presses the rubber plug downwards after the installation is completed, the protective plate 19 can completely protect the rubber plug, the heavy object is firstly pressed onto the protective plate 19, the protective plate 19 drives a support rod 18 to move downwards, the support rod 18 drives a buffer plate 16 to move downwards, the buffer plate 16 drives a sliding block 15 to move downwards, the sliding block 15 slides downwards, thereby the buffer rubber 17 between the bottom of the buffer board 16 and the bottom inside the open slot 13 is squeezed, the buffer rubber 17 utilizes the elasticity of rubber to play a good buffer role, and the protection board 19 can also squeeze the hydraulic rod 20 in the downward moving process, the hydraulic rod 20 begins to shrink, thereby driving the spring 21 to shrink, the spring 21 can also play a good buffer role by utilizing the elasticity thereof, thereby buffering the pressure, thereby being capable of well protecting the rubber plug, preventing the rubber plug from being crushed or pressed into the sleeve to be not easily taken out, when the pressure of the heavy object disappears, the elasticity of the spring 21 can prevent the hydraulic rod 20 from recovering to the original height, thereby driving the protection board 19 to recover to the original height, the buffer rubber 17 utilizes the ductility of rubber to also rapidly recover to the original shape, the installation block 3 is aligned with the opening on the sleeve, then the installation block 3 is inserted into the opening of the sleeve, at this time, the thread block 2 just supports the upper part of the opening, at this time, the rubber plug top 1 is rotated clockwise (it needs to be explained that the rubber plug top 1 is made of stainless steel material, the structure below the rubber plug top 1 is made of butyl rubber), the thread block 2 is clamped into the opening (the inside of the opening is provided with threads corresponding to the thread block 2), the installation of the rubber plug can be completed, after the installation is completed, when a heavy object presses the rubber plug downwards, the protective plate 19 can completely protect the rubber plug, the heavy object presses the protective plate 19 first, the protective plate 19 drives the support rod 18 to move downwards, the support rod 18 drives the buffer plate 16 to move downwards, the buffer plate 16 drives the slide block 15 to move downwards, the slide block 15 slides downwards along the slide rail 14, so as to extrude the buffer rubber 17 between the bottom end of the buffer plate 16 and the bottom end inside the open slot 13, the buffer rubber 17 utilizes the elasticity, and the in-process that protection shield 19 moved down, also can extrude hydraulic stem 20, hydraulic stem 20 begins to shrink, thereby drive the shrink of spring 21, spring 21 utilizes its elasticity also can play fine buffer memory effect, can buffer memory like this to pressure, thereby the protection plug that can be fine, prevent that the plug from being crushed or pressing into the intraductal difficult taking out of cover, after the pressure of heavy object disappears, spring 21's elastic energy prevents that hydraulic stem 20 from recovering to original height, thereby drive protection shield 19 and recover to original height, buffer memory rubber 17 utilizes the ductility of rubber, also can recover original shape rapidly.
The invention is a novel calibration rubber plug for casing sealing test, which comprises a hydraulic rod 20 (model: DP-60 manufacturer: shanghai new west mountain, under the condition that air is in the water pumping pipe of a water pump, the negative pressure (vacuum) formed when the pump works is utilized, the negative pressure is lower than the water pressure of a water pumping port under the action of atmospheric pressure, and then the negative pressure is discharged from the water discharging end of the water pump), the electrical components are all products in the prior art, the electrical components are selected, installed and completed by a person skilled in the art according to the use requirement, so as to ensure that each electrical component can normally work, the components are all universal standard components or components known by the person skilled in the art, the structure and the principle of the components can be known by the person skilled in the art or by a conventional experimental method, and the applicant does not make specific limitations here.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (7)
1. A novel calibration rubber plug for casing sealing test comprises a rubber plug top (1) and is characterized in that a threaded block (2) is fixedly connected to the bottom end of the rubber plug top (1), a groove A (4) is fixedly connected to the middle portion of the top end of the rubber plug top (1), a movable block A (5) is fixedly connected to the inside of the groove A (4) in a sliding mode, a groove B (6) is fixedly connected to the left side end of the movable block A (5), a movable block B (8) is fixedly connected to the inside of the groove B (6) in a sliding mode, a connecting rod (9) is fixedly connected to the left side end of the movable block B (8), a supporting plate (12) is fixedly connected to the right side of the top end of the rubber plug top (1), an open slot (13) is fixedly connected to the middle portion of the top end of the supporting plate (12), a sliding rail (14) is fixedly, fixedly connected with buffer board (16) between slider (15), the top fixedly connected with bracing piece (18) of buffer board (16) and the top fixedly connected with protection shield (19) of bracing piece (18).
2. The novel calibration rubber plug for the casing sealing test according to claim 1, wherein the bottom end of the thread block (2) is fixedly connected with a mounting block (3).
3. The novel calibration rubber plug for the casing sealing test according to claim 1, wherein a handle (11) is fixedly connected to the top end of the connecting rod (9).
4. The novel calibration rubber plug for the casing sealing test according to claim 1, wherein the left side and the right side of the top end of the groove A (4) are fixedly connected with baffle plates A (7).
5. The novel calibration rubber plug for the casing sealing test according to claim 1, wherein the left side and the right side of the top end of the groove B (6) are fixedly connected with baffle plates B (10).
6. The novel calibration rubber plug for the casing sealing test according to claim 1, wherein a buffer rubber (17) is fixedly installed between the bottom end of the buffer plate (16) and the bottom end of the inside of the open slot (13).
7. The novel calibration rubber plug for the casing sealing test according to claim 1, wherein a hydraulic rod (20) is fixedly installed on each of two sides of the open slot (13) between the bottom end of the protection plate (19) and the top end of the support plate (12), and a spring (21) is fixedly installed on the outer side wall of the hydraulic rod (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011206196.1A CN112345164B (en) | 2020-11-03 | 2020-11-03 | Calibration rubber plug for casing sealing test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011206196.1A CN112345164B (en) | 2020-11-03 | 2020-11-03 | Calibration rubber plug for casing sealing test |
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| CN112345164A true CN112345164A (en) | 2021-02-09 |
| CN112345164B CN112345164B (en) | 2022-12-16 |
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| US4467636A (en) * | 1981-08-11 | 1984-08-28 | Josef Dagn | Testing instrument for pipes or other cavities to be tested as to tightness |
| CN1361862A (en) * | 1998-09-23 | 2002-07-31 | 盖伊·伯鲁贝 | Apparatus for isolating or testing a pipe segment |
| US20050199389A1 (en) * | 2004-03-12 | 2005-09-15 | Dallas L. M. | Wellhead and control stack pressure test plug tool |
| US20080184796A1 (en) * | 2007-02-07 | 2008-08-07 | Smida Charles R | Hydrostatic testing tool and methods of use |
| KR20090098160A (en) * | 2008-03-13 | 2009-09-17 | 현대자동차주식회사 | Sealent spray device of engine processing line |
| CN206668963U (en) * | 2017-04-10 | 2017-11-24 | 重庆市江津区长兴机械有限责任公司 | A kind of engine tube screw thread leak test sealing plug |
| CN108868689A (en) * | 2018-09-18 | 2018-11-23 | 中国石油集团西部钻探工程有限公司 | Remove the tail pipe rubber plug device of cement slurry in parts casing pipe under drilling liner cementing block ring |
| CN109505978A (en) * | 2018-12-29 | 2019-03-22 | 浙江德众汽车零部件制造有限公司 | A kind of compensation interior swollen plugging mechanism of radial compliance |
| CN111735573A (en) * | 2020-07-09 | 2020-10-02 | 李超 | Oil gas well casing reliability evaluation device |
-
2020
- 2020-11-03 CN CN202011206196.1A patent/CN112345164B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4467636A (en) * | 1981-08-11 | 1984-08-28 | Josef Dagn | Testing instrument for pipes or other cavities to be tested as to tightness |
| CN1361862A (en) * | 1998-09-23 | 2002-07-31 | 盖伊·伯鲁贝 | Apparatus for isolating or testing a pipe segment |
| US20050199389A1 (en) * | 2004-03-12 | 2005-09-15 | Dallas L. M. | Wellhead and control stack pressure test plug tool |
| US20080184796A1 (en) * | 2007-02-07 | 2008-08-07 | Smida Charles R | Hydrostatic testing tool and methods of use |
| KR20090098160A (en) * | 2008-03-13 | 2009-09-17 | 현대자동차주식회사 | Sealent spray device of engine processing line |
| CN206668963U (en) * | 2017-04-10 | 2017-11-24 | 重庆市江津区长兴机械有限责任公司 | A kind of engine tube screw thread leak test sealing plug |
| CN108868689A (en) * | 2018-09-18 | 2018-11-23 | 中国石油集团西部钻探工程有限公司 | Remove the tail pipe rubber plug device of cement slurry in parts casing pipe under drilling liner cementing block ring |
| CN109505978A (en) * | 2018-12-29 | 2019-03-22 | 浙江德众汽车零部件制造有限公司 | A kind of compensation interior swollen plugging mechanism of radial compliance |
| CN111735573A (en) * | 2020-07-09 | 2020-10-02 | 李超 | Oil gas well casing reliability evaluation device |
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| CN112345164B (en) | 2022-12-16 |
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