CN114673470A - Rubber plug feeding device for replacing high-pressure grouting in coal mine and grouting method - Google Patents
Rubber plug feeding device for replacing high-pressure grouting in coal mine and grouting method Download PDFInfo
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- CN114673470A CN114673470A CN202210350291.1A CN202210350291A CN114673470A CN 114673470 A CN114673470 A CN 114673470A CN 202210350291 A CN202210350291 A CN 202210350291A CN 114673470 A CN114673470 A CN 114673470A
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- grouting
- rubber plug
- drill rod
- wall
- rod
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- 239000003245 coal Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 20
- 239000012779 reinforcing material Substances 0.000 claims abstract description 17
- 238000007569 slipcasting Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/134—Bridging plugs
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to the field of coal mine machinery, and relates to a rubber plug feeding device for high-pressure grouting displacement in a coal mine well and a grouting method, wherein the rubber plug feeding device comprises a lower joint arranged at the rear end of a drill rod and an upper joint arranged at the front end of a water swivel, a flow divider and a rubber plug sleeve which are sequentially connected with the upper joint are arranged in an inner cavity of the drill rod, a lining rod is arranged on the peripheral sides of the flow divider and the rubber plug sleeve, an annular cavity convenient for grouting circulation is formed between the outer wall of the lining rod and the inner wall of the drill rod, a plurality of layers of wing-shaped rubber plugs are fixedly arranged outside the rubber plug sleeve, a positioning sleeve sleeved at the rear end of the lining rod is arranged in the drill rod close to one side of the lower joint in a sliding manner, and a fixing pin used for fixing the positioning sleeve is arranged on the outer wall of the drill rod; the problem of current colliery during slip casting operation in pit reinforcing material is remained to the slip casting drilling rod inner wall and is replaced unclean, can not effectively realize the slip casting pressurize, prevent to leak the thick liquid, influences the slip casting and consolidates the effect is solved.
Description
Technical Field
The invention belongs to the field of coal mine machinery, and relates to a rubber plug feeding device for high-pressure grouting replacement in an underground coal mine and a grouting method.
Background
In the underground directional drilling construction process of the coal mine, the underground directional drilling construction method has the advantages that a broken stratum of a structure is frequently drilled, a good effect can be achieved by adopting fixed point grouting reinforcement, and the situations of hole collapse, drill sticking, drill embracing and the like can be avoided when subsequent drilling holes are drilled into the broken stratum of the reinforced structure.
After the fixed-point grouting operation is finished, reinforcing materials in a pipeline, a drill rod and a grouting device are generally required to be completely replaced, and currently, clear water is usually adopted for direct replacement, so that the problem that the replacement of the reinforcing materials in the grouting drill rod and the grouting device is not complete exists, the grouting drill rod and the grouting device are damaged in serious cases, grouting pressure maintaining cannot be effectively realized, and the grouting reinforcement effect is influenced; although the high-pressure grouting displacement has many mature experiences in the fields of petroleum drilling, geological exploration and engineering construction, due to the problems of particularity of underground working environment of a coal mine, difference of process characteristics and the like, the mature experiences and devices in other fields cannot be directly applied to underground high-pressure grouting displacement operation of the coal mine.
Disclosure of Invention
In view of the above, the invention provides a rubber plug feeding device and a grouting method for high-pressure grouting replacement in an underground coal mine, which are used for solving the problems that the residual reinforcement material on the inner wall of a grouting drill rod cannot be completely replaced during the existing underground coal mine grouting operation, grouting pressure maintaining cannot be effectively realized, slurry leakage is prevented, and the grouting reinforcement effect is influenced.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a colliery is high-pressure slip casting rubber plug feeding device for replacement in pit, including the top connection of arranging the lower clutch of drilling rod rear end in and arranging the water swivel front end in, the drilling rod inner chamber is provided with branch tap and the plug cover of being connected with the top connection in proper order, branch tap and plug cover week side are equipped with the lining pole, form the annular cavity of the slip casting circulation of being convenient for between lining pole outer wall and the drilling rod inner wall, the plug cover external fixation is provided with a plurality of layers of wing plug, sliding installation has the position sleeve of cup jointing at the lining pole rear end in the drilling rod that is close to lower clutch one side, be provided with the shop bolt that is used for fixed position sleeve on the drilling rod outer wall.
Furthermore, an O-shaped sealing ring I is arranged between the flow dividing head and the lining rod.
Furthermore, an O-shaped sealing ring II and an O-shaped sealing ring III are arranged between the positioning sleeve and the inner wall of the drill rod.
Further, the connection mode between the upper joint and the lower joint is threaded connection or bolt connection.
Further, the outer wall of the drill rod is provided with a locking pin for fixing the upper joint and the lower joint of the adjacent drill rod.
Further, the outer diameter of the positioning sleeve is matched with the inner diameter of the upper part of the lower joint. Has the advantages that: when the positioning sleeve drives the lining rod to move downwards, the lining rod and the positioning sleeve can be clamped on the inner wall of the drill rod at the upper part of the lower joint.
A grouting method of a rubber plug feeding device for replacing underground high-pressure grouting of a coal mine comprises the following steps:
A. determining the depth of a fixed-point grouting hole; in the directional drilling, the position of a complex stratum needing grouting is determined by measuring the hole depth and the number of drill lifting rods, and the required slurry amount is roughly determined according to the grouting influence range;
B. grouting under pressure; the upper joint is connected with a pipeline of a grouting pump truck, pumped reinforcing materials enter from the upper joint, enter a grouting drill rod along an annular cavity between the rubber plug sleeve and the upper joint and then are injected into a target hole section;
C. displacing cement slurry in the drill rod; after the reinforcing material is extruded and injected, the fixing pin is detached, the pressure test pump is connected for pressurizing, the positioning sleeve descends to the upper part of the lower connector, the displacement liquid is continuously injected from the upper connector, the liquid pushes the rubber plug to descend, the rubber plug moves to the bottom of a hole along the inner wall of the grouting drill rod, and the opening wing of the rubber plug on the rubber plug sleeve plays a role in scraping the drill rod and the inner wall of the grouting device in the movement process, so that the residual reinforcing material on the inner wall of the drilling rod and the grouting device is completely displaced, and the functions of preventing slurry leakage and maintaining pressure are achieved in the grouting process.
And furthermore, a positioning sleeve sleeved at the rear end of the lining rod is slidably mounted in the drill rod close to one side of the lower joint in the step B, and a hole communicated with the annular cavity is formed in the positioning sleeve.
Furthermore, in the step C, the tension wing of the rubber plug on the rubber plug sleeve has elasticity.
The invention has the beneficial effects that:
according to the device for throwing the rubber plug for replacing the underground high-pressure grouting of the coal mine, disclosed by the invention, the lining rod and the positioning sleeve can slide along the inner wall of the drill rod, and when the upper part of the lining rod is in sealing connection with the flow dividing head, a reinforcing material injected from the upper joint enters the grouting drill rod along an annular cavity between the rubber plug sleeve and the upper joint and is injected into a target hole section; after the reinforcing material is extruded and injected, the lining rod and the positioning sleeve move downwards, the lower parts of the lining rod and the positioning sleeve are hermetically connected with the upper part of the lower connector, the displacement liquid injected from the upper connector pushes the rubber plug sleeve to move downwards, and the tension wing of the rubber plug on the rubber plug sleeve enables the residual reinforcing material on the inner wall of the drill rod to be completely displaced, and plays roles of preventing slurry leakage and maintaining pressure in the grouting process; the device is put in to high-pressure slip casting replacement rubber stopper in pit in the colliery, and is effectual, stable strong, the security is high in the use, can guarantee that drilling rod inner wall reinforcing material replaces totally.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural view of an embodiment of a rubber plug feeding device for high-pressure grouting replacement in a coal mine.
Reference numerals: the rubber plug comprises an upper joint 1, a flow dividing head 2, an O-shaped sealing ring I3, a rubber plug sleeve 4, a lining rod 5, a rubber plug 6, an O-shaped sealing ring II 7, a positioning sleeve 8, a fixing pin 9, an O-shaped sealing ring III 10, a locking pin 11 and a lower joint 12.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
The device for throwing the rubber plug for replacing the high-pressure grouting underground coal mine comprises a lower connector 12 arranged at the rear end of a drill rod and an upper connector 1 arranged at the front end of a water braid, wherein the upper connector 1 and the lower connector 12 of adjacent drill rod units are connected in a threaded connection mode or a bolt connection mode. And the outer wall of the drill rod is provided with a locking pin 11 for fixing an upper joint and a lower joint of the adjacent drill rod. And after the upper joint and the lower joint of the adjacent drill rod units are connected, the upper joint and the lower joint are fixedly connected through the anti-loosening pin on the outer wall of the drill rod.
The inner cavity of the drill rod is provided with a flow dividing head 2 and a rubber plug sleeve 4 which are sequentially connected with an upper joint, a lining rod 5 is sleeved on the periphery of the flow dividing head 2 and the rubber plug sleeve 4, and an O-shaped sealing ring I3 is arranged between the flow dividing head 2 and the lining rod 5. An annular cavity convenient for grouting circulation is formed between the outer wall of the lining rod 5 and the inner wall of the drill rod, a four-layer wing-shaped rubber plug 6 is fixedly arranged outside the rubber plug sleeve 4, a positioning sleeve 8 sleeved at the rear end of the lining rod is slidably arranged in the drill rod close to one side of the lower joint, and an O-shaped sealing ring 7 II and an O-shaped sealing ring III 10 are arranged between the positioning sleeve 8 and the inner wall of the drill rod. And a fixing pin 9 for fixing the positioning sleeve is arranged on the outer wall of the drill rod. The outer diameter of the positioning sleeve is matched with the inner diameter of the upper part of the lower joint.
A grouting method of a rubber plug feeding device for replacing high-pressure grouting in a coal mine well is mainly used for extruding and injecting reinforcing materials in a drill hole, and plays roles of replacing, preventing slurry leakage and maintaining pressure in the grouting operation process. During grouting operation, the method specifically comprises the following steps:
A. determining the depth of a fixed-point grouting hole; in the directional drilling, the position of a complex stratum needing grouting is determined by measuring the hole depth and the number of drill lifting rods, and the required slurry amount is roughly determined according to the grouting influence range;
B. grouting under pressure; when a coal mine underground drill rod is drilled, the upper joint 1 is connected with a grouting pump truck pipeline, pumped reinforcing materials enter from the upper joint, enter the grouting drill rod along an annular cavity between the rubber plug sleeve 4 and the upper joint 1, and then are injected into a target hole section;
C. displacing cement slurry in the drill rod; after the reinforcing material is extruded, the fixing pin 9 is detached, the pressure test pump is connected for pressurizing, the positioning sleeve drives the lining rod to move downwards to the upper part of the lower connector 12, the upper part of the lining rod is separated from the flow dividing head 2, the displacement liquid is continuously injected from the upper connector 1, the liquid pushes the rubber plug sleeve 4 to move downwards and move to the bottom of the hole along the inner wall of the grouting drill rod, and the opening wings of the rubber plug 6 on the rubber plug sleeve 4 play a role in scraping the drill rod and the inner wall of the grouting device in the moving process, so that the residual reinforcing material on the drill rod and the inner wall of the grouting device is completely replaced, and the effects of preventing slurry leakage and maintaining pressure are played in the grouting process.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (9)
1. The utility model provides a colliery is high pressure slip casting in pit is replaced with plug and is put in device, a serial communication port, including the top connection of arranging the lower clutch of drilling rod rear end in and arranging the water swivel front end in, the drilling rod inner chamber is provided with flow divider and plug cover be connected with the top connection in proper order, flow divider and plug cover week side are equipped with the lining pole, form the annular space chamber of the slip casting circulation of being convenient for between lining pole outer wall and the drilling rod inner wall, plug cover external fixation is provided with a plurality of layers of wing plug, slidable mounting has the position sleeve of cup jointing at the lining pole rear end in the drilling rod that is close to lower clutch one side, be provided with the fixed pin who is used for fixed position sleeve on the drilling rod outer wall.
2. The device for throwing the rubber plug for replacing the coal mine underground high-pressure grouting according to claim 1, wherein an O-shaped sealing ring I is arranged between the flow dividing head and the lining rod.
3. The device for throwing the rubber plug for replacing the coal mine underground high-pressure grouting according to claim 1, wherein an O-shaped sealing ring II and an O-shaped sealing ring III are arranged between the positioning sleeve and the inner wall of the drill rod.
4. The underground coal mine high-pressure grouting and replacing rubber plug feeding device according to claim 1, wherein the upper joint and the lower joint are connected in a threaded connection or a bolt connection mode.
5. The device for throwing the rubber plug for replacing the coal mine underground high-pressure grouting according to claim 1, wherein the outer wall of the drill rod is provided with a locking pin for fixing an upper joint and a lower joint of the adjacent drill rod.
6. The underground coal mine high-pressure grouting and replacing rubber plug feeding device as claimed in claim 1, wherein the outer diameter of the positioning sleeve is matched with the inner diameter of the upper part of the underground joint.
7. A grouting method of a rubber plug feeding device for replacing underground high-pressure grouting of a coal mine is characterized by comprising the following steps of:
A. determining the depth of a fixed-point grouting hole; in the directional drilling, the position of a complex stratum needing grouting is determined by measuring the hole depth and the number of drill lifting rods, and the required slurry amount is roughly determined according to the grouting influence range;
B. grouting under pressure; the upper joint is connected with a pipeline of a grouting pump truck, pumped reinforcing materials enter from the upper joint, enter a grouting drill rod along an annular cavity between the rubber plug sleeve and the upper joint and then are injected into a target hole section;
C. displacing cement slurry in the drill rod; after the reinforcing material is extruded, the fixing pin is detached, the pressure test pump is connected for pressurizing, the positioning sleeve descends to the upper part of the lower connector, the displacement liquid is continuously injected from the upper connector, the liquid pushes the rubber plug to descend and moves to the bottom of the hole along the inner wall of the grouting drill rod, and the expansion wing of the rubber plug on the rubber plug sleeve plays a role in scraping the drill rod and the inner wall of the grouting device in the moving process, so that the residual reinforcing material on the inner wall of the drill rod and the grouting device is completely displaced, and the functions of preventing slurry leakage and maintaining pressure are played in the grouting process.
8. The grouting method of the rubber plug feeding device for coal mine underground high-pressure grouting replacement according to claim 7, wherein a positioning sleeve sleeved at the rear end of the lining rod is slidably mounted in the drill rod close to one side of the lower joint in the step B, and a hole communicated with the annular cavity is formed in the positioning sleeve.
9. The grouting method of the device for replacing the rubber plug in coal mine underground high-pressure grouting according to claim 8, wherein in the step C, the tension wing of the rubber plug on the rubber plug sleeve has elasticity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210350291.1A CN114673470B (en) | 2022-04-02 | 2022-04-02 | Rubber plug throwing device for underground high-pressure grouting displacement of coal mine and grouting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210350291.1A CN114673470B (en) | 2022-04-02 | 2022-04-02 | Rubber plug throwing device for underground high-pressure grouting displacement of coal mine and grouting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114673470A true CN114673470A (en) | 2022-06-28 |
| CN114673470B CN114673470B (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210350291.1A Active CN114673470B (en) | 2022-04-02 | 2022-04-02 | Rubber plug throwing device for underground high-pressure grouting displacement of coal mine and grouting method |
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Citations (13)
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| SU983255A1 (en) * | 1980-06-25 | 1982-12-23 | Meladze Boris B | Apparatus for cementing wells |
| CN2625569Y (en) * | 2003-06-06 | 2004-07-14 | 辽河石油勘探局钻井一公司 | Impacting shearing device for tail pipe well completion |
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| CN202064887U (en) * | 2011-05-27 | 2011-12-07 | 中国石油化工集团公司 | Balanced cement plug bumping device |
| CN102953707A (en) * | 2012-11-13 | 2013-03-06 | 中国石油化工股份有限公司 | Top-drive drill rod well cementing head |
| CN104110234A (en) * | 2014-07-31 | 2014-10-22 | 于世江 | Method for well cementation drilling-free blind plate circulating well cementation of horizontal well |
| CN104121001A (en) * | 2014-07-31 | 2014-10-29 | 于世江 | Drilling-free cement injecting device for horizontal well |
| CN104153738A (en) * | 2013-05-14 | 2014-11-19 | 四川海沃石油工程技术有限公司 | Blocking controlling and leaking stopping tool assembly and leaking stopping method applied to drilling engineering |
| CN204283320U (en) * | 2014-10-31 | 2015-04-22 | 中国石油化工集团公司 | Deep-well cementing plug instrument |
| US20200256498A1 (en) * | 2019-09-25 | 2020-08-13 | Infrastructure Renewal Institute of Southern China | Trenchless integrative repair method for concrete drainage pipeline with cracking, corrosion and subsidence |
| CN113309487A (en) * | 2021-05-24 | 2021-08-27 | 中煤科工集团西安研究院有限公司 | Recoverable fixed-point grouting device and method for directional long drilling hole in underground coal mine |
| CN114109302A (en) * | 2021-11-24 | 2022-03-01 | 中石化石油工程技术服务有限公司 | Permeable composite rubber plug for well cementation and use method |
-
2022
- 2022-04-02 CN CN202210350291.1A patent/CN114673470B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU983255A1 (en) * | 1980-06-25 | 1982-12-23 | Meladze Boris B | Apparatus for cementing wells |
| CN2625569Y (en) * | 2003-06-06 | 2004-07-14 | 辽河石油勘探局钻井一公司 | Impacting shearing device for tail pipe well completion |
| CN200968196Y (en) * | 2006-11-08 | 2007-10-31 | 四川石油管理局井下作业公司 | Non sieve tube weighing drill stem plug capturing blowout preventer |
| CN201013303Y (en) * | 2006-11-08 | 2008-01-30 | 四川石油管理局井下作业公司 | Weighting drill stem plug-catch spraying-proof device with plug-catch screen pipe |
| CN202064887U (en) * | 2011-05-27 | 2011-12-07 | 中国石油化工集团公司 | Balanced cement plug bumping device |
| CN102953707A (en) * | 2012-11-13 | 2013-03-06 | 中国石油化工股份有限公司 | Top-drive drill rod well cementing head |
| CN104153738A (en) * | 2013-05-14 | 2014-11-19 | 四川海沃石油工程技术有限公司 | Blocking controlling and leaking stopping tool assembly and leaking stopping method applied to drilling engineering |
| CN104110234A (en) * | 2014-07-31 | 2014-10-22 | 于世江 | Method for well cementation drilling-free blind plate circulating well cementation of horizontal well |
| CN104121001A (en) * | 2014-07-31 | 2014-10-29 | 于世江 | Drilling-free cement injecting device for horizontal well |
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| US20200256498A1 (en) * | 2019-09-25 | 2020-08-13 | Infrastructure Renewal Institute of Southern China | Trenchless integrative repair method for concrete drainage pipeline with cracking, corrosion and subsidence |
| CN113309487A (en) * | 2021-05-24 | 2021-08-27 | 中煤科工集团西安研究院有限公司 | Recoverable fixed-point grouting device and method for directional long drilling hole in underground coal mine |
| CN114109302A (en) * | 2021-11-24 | 2022-03-01 | 中石化石油工程技术服务有限公司 | Permeable composite rubber plug for well cementation and use method |
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| Publication number | Publication date |
|---|---|
| CN114673470B (en) | 2023-11-03 |
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