AU2019101682A4 - Fluid-based segmented filling grouting sealing method - Google Patents
Fluid-based segmented filling grouting sealing method Download PDFInfo
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- AU2019101682A4 AU2019101682A4 AU2019101682A AU2019101682A AU2019101682A4 AU 2019101682 A4 AU2019101682 A4 AU 2019101682A4 AU 2019101682 A AU2019101682 A AU 2019101682A AU 2019101682 A AU2019101682 A AU 2019101682A AU 2019101682 A4 AU2019101682 A4 AU 2019101682A4
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- Prior art keywords
- grouting
- fluid
- sealing
- filling
- elastic filling
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- 238000007789 sealing Methods 0.000 title claims abstract description 60
- 239000012530 fluid Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000003245 coal Substances 0.000 claims abstract description 23
- 230000000694 effects Effects 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 20
- 230000009471 action Effects 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 claims abstract description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 14
- 239000002775 capsule Substances 0.000 claims description 12
- 239000004971 Cross linker Substances 0.000 claims description 10
- 229920001971 elastomer Polymers 0.000 claims description 10
- 239000000084 colloidal system Substances 0.000 claims description 9
- 239000000376 reactant Substances 0.000 claims description 7
- 239000012466 permeate Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 239000003431 cross linking reagent Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 9
- 239000003566 sealing material Substances 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 abstract description 2
- 238000005065 mining Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000011405 expansive cement Substances 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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 OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a fluid-based segmented filling grouting sealing method. The method first expands and seals a gap between a discharge pipe and a drilling wall by elastically filling a cavity at both ends of a borehole, and then injects the non-Newtonian fluid paste sealing material into the grouting space between the elastic filling cavities. Under the action of pressure the fluid penetrates into the coal body, thereby sealing the cracks around the borehole, and if necessary, the secondary grouting can be carried out. Compared with the prior art, the invention has the advantages that the sealing materials are all flexible materials and can change adaptively with the deformation of the hole, so the sealing effect is good, and the sealing is non-solidified fluid, the secondary slurry filling is convenient, the operation is simple, safe and reliable, the applicability is strong, etc., the phenomenon of air leakage caused by inadequate sealing can be avoided, the sealing quality can be improved, the gas tightness can be guaranteed, and the effect of gas on the coal-drainage layer can be improved. -1 - g3 4 5 t Fig. 1
Description
Fluid-based segmented filling grouting sealing method
Technical Field [0001] The invention relates to a fluid-based segmented filling grouting sealing method, which is suitable for the sealing work of gas drainage drilling in coal mines.
Background Technology [0002] Gas is a common associated gas in the process of coal mining. On the one hand, if it is prevented improperly, the gas emission in the process of coal mining will become a natural disaster that threatens the safety of coal mine production; on the other hand, if the drainage measures are properly and reasonably utilized, it will become an important energy source. With the increasing depth and intensity of coal mining, there are more and more high-gas mines. Regardless of disaster prevention or mining of this kind of energy, gas drainage is the most commonly used technical approach, and borehole sealing is one of the key technologies of gas drainage, because the negative pressure at the bottom of the hole has the effect of drainage gas and forced gas analysis. The effect of drilling seal directly affects the concentration and efficiency of gas drainage.
[0003] At present, about 65% of the coal mining faces in China have low pre-gas drainage concentration; the main problem is that the quality of drilling sealing is too poor. At present, the most commonly used method of gas drainage sealing hole is to fill the drainage pipe and the borehole wall with materials with expansion properties such as polyurethane, expansive cement and other materials , and rely on the expansion and curing of these materials to achieve the purpose of hole sealing, and then the gas drainage. After a certain period of gas drainage, the coal seam will be affected by deformation, displacement or mining, which will lead to the expansion and development of the hole (crack) gap in the coal seam around the hole, then the external air will enter the pumping hole from the fracture channel, which leads to the obvious decrease of the gas drainage concentration, shortens the effective drainage period of the drainage hole and reduces the utilization rate of the hole.
-1 2019101682 23 Dec 2019 [0004] In order to solve this problem, the technicians invented the capsule-type sealing device, but this type of sealing device has a common disadvantage, that is, although the sealing device can be closely combined with the drilling wall of the borehole to seal the gap between the drainage pipe and the drilling wall, it can not effectively seal the cracks of the coal around the hole, which leads to gas leakage and affects the drainage concentration. The technicians have also invented sealing materials such as cement, expansion materials and polyurethane, which are solid-state seals after solidification. After new cracks are produced in drilling with the change of stress, sealing failure occurs quickly, resulting in a drastic decrease in the drainage effect.
Invention Summary [0005] In view of the above-mentioned shortcomings in the prior art, the present invention provides a fluid-based segmented filling grouting and sealing method. Through a segmented capsule grouting sealing device, the phenomenon of air and gas leakage caused by inadequate sealing is avoided. At the same time, the sealing materials are flexible materials, which can change adaptively with the deformation of the hole, can improve the sealing quality, ensure the air tightness, and the seal is not solidified fluid. When the sealing effect of the capsule or grouting space is reduced, the secondary filling slurry can be carried out, which has the advantages of simple operation, good sealing effect, long effective sealing time, safety and reliability, strong applicability and high efficiency.
[0006] In order to solve the above problems, the technical solution adopted by the present invention is:
[0007] A fluid-based segmented filling grouting sealing method includes the following steps:
[0008] In the first step, the two elastic filling cavities are respectively connected to the two near
-22019101682 23 Dec 2019 ends of the gas drainage pipe, and the gas drainage pipes, together with two elastic filling cavities, are placed in the hole, and the fluid is filled into the two elastic filling cavities respectively. After the expansion of the two elastic filling cavities, the gap between the drainage pipe and the drilling wall is sealed.
[0009] In the second step, the fluid is filled into the grouting space reserved between the two elastic filling cavities, and the fluid is filled with the fluid through the grouting pressure, and the fluid is pressed into the cracks around the hole by the grouting pressure;
[0010] In the third step, when the sealing effect of the two elastic filling cavities is reduced, the secondary grouting is carried out into the two elastic filling cavities.
[0011] In the fourth step, when the sealing effect of grouting space is reduced, the secondary grouting is carried out into the grouting space.
[0012] In the first and the third steps, when the pressure in the elastic filling cavity reaches 1.0-1.5 MPa, the grouting is stopped, and in the second and fourth steps, when the pressure in the grouting space reaches 0.5-1.0 MPa, and the grouting is stopped.
[0013] The grouting device is adopted in the grouting process. The grouting device includes a bucket, a grouting pump, a pressure gauge, a control valve A, a control valve B, a first grouting channel and a second grouting channel. The quantity of the bucket is consistent with the number of fluid components, the quantity of the suction port of the grouting pump is the same as the quantity of the material bucket, and the pressure gauge is arranged at the outlet of the grouting pump. After inhaling and mixing the components in each bucket evenly, the grouting pump flows to the first grouting channel and the second grouting channel respectively through the outlet port. The first grouting channel leads to two elastic filling cavities in turn; the second grouting channel leads to the grouting space; the control valve A is provided on the first grouting channel, and the
- 3 2019101682 23 Dec 2019 control valve B is provided on the second grouting channel.
[0014] The fluid used for filling is a non-Newtonian fluid.
[0015] The components of the non-Newtonian fluid include polyacrylamide and a cross-linking agent.
[0016] A liquid colloid is formed by the mixed reaction of polyacrylamide with cross-linker. With the increase of reaction time, the viscosity of the colloid increases continuously with the increase of time, and the colloid becomes a paste with poor flowability after 2 hours. The viscosity of the paste reaches a maximum after one week, after which the viscosity no longer changes, and finally exists in the state of high viscosity mobile colloid between coal seam fissures.
[0017] After the grouting stopped in the elastically filled cavity, the mixed reactant of polyacrylamide and cross-linking agent continued to expand and squeeze the borehole wall.
[0018] After the grouting is stopped in the grouting space, the mixed reactants of polyacrylamide and cross-linker continue to expand, and under the action of expansion pressure, the fluid continues to permeate the cracks of the bored coal wall to achieve sealing.
[0019] The elastic filling cavity is a rubber capsule, and the rubber inflated at both ends is used to block the fluid in the grouting space between the two, the fluid permeates the cracks in the coal seam, and the gas and air are sealed in vacuum.
[0020] Compared with the prior art, the present invention has the following technical effects:
-42019101682 23 Dec 2019 [0021] (l)In the present invention, the space between the drainage pipe and the borehole wall is continuously expanded and sealed by elastically filling the cavity at both ends of the drainage pipe, and finally the hole is grouted to seal the hole, thereby ensuring the sealing effect of the borehole.
[0022] (2)The invention overcomes the problem that the sealing material infiltrates into the bottom of the hole and affects the drainage effect due to the poor grouting effect of the filling material, which has the advantages of good sealing guarantee, high sealing success rate and remarkable improvement in the gas drainage effect.
[0023] (3)Because of its remarkable sealing effect, this method can effectively seal the gas drainage hole, ensure the normal operation of gas drainage, and is suitable for popularization and use in coal mine.
[0024] (4)By adopting flexible sealing method, the deformation of high stress drilling can be changed adaptively, the gas and air leakage can be prevented, and the negative pressure of pumping can be improved.
Description of the Drawings [0025] FIG. 1 is a schematic structural diagram of a grouting device and a sealing device according to the present invention.
[0026] Among them, 1. A bucket; 2. B bucket; 3. Grouting pump; 4. Control valve A; 5. Control valve B; 6. Coal body; 7. Drilling; 8. The first grouting channel; 9. The second grouting channel.
Detailed Description of the Presently Preferred Embodiments [0027] The present invention will now be described in further detail with reference to the
- 5 2019101682 23 Dec 2019 drawings. These drawings are simplified diagrams, which illustrate the basic structure of the present invention only in a schematic manner, and therefore only show the constitutions related to the present invention.
[0028] The figure includes the following structure: 1. A bucket 2. B bucket 3. Grouting pump 4. Control valve A 5. Control valve B 6. Coal body 7. Drilling 8.The first grouting channel and 9. The second grouting channel.
[0029] The sealing device includes two elastically filled cavities.
[0030] As shown in FIG. 1, a fluid-based segmented filling grouting sealing method includes the following steps:
[0031] in the first step, the two elastic filling cavities are respectively connected to the two proximal ends of the gas drainage pipe, and the gas drainage pipe together with the two elastic filling cavities are placed in the borehole, and the fluid is filled into the two elastic filling cavities respectively. After the expansion of the two elastic filling cavities, the gap between the drainage pipe and the drilling wall is sealed, and the gap between the drainage pipe and the drilling wall is sealed by the method of elastic filling cavity expansion at both ends of the hole.
[0032] In the second step, the fluid is filled into the grouting space reserved between the two elastic filling cavities, and the grouting space is filled with fluid, and the fluid is pressed into the cracks around the hole through grouting pressure, and the fluid infiltrates into the coal body under the action of pressure, thus sealing the cracks around the hole.
[0033] In the third step, when the sealing effect of the two elastically filled cavities is reduced, the secondary filling is carried out into the two elastically filled cavities;
- 6 2019101682 23 Dec 2019 [0034]In the fourth step, when the sealing effect of the grouting space is reduced, the secondary grouting is carried out into the grouting space.
[0035] In the first and the third steps, when the pressure in the elastic filling cavity reaches 1.0-1.5 MPa, the grouting is stopped, and in the second and fourth steps, when the pressure in the grouting space reaches 0.5-1.0 MPa, and the grouting is stopped.
[0036] The grouting device is adopted in the grouting process. The grouting device includes the bucket, the grouting pump, the pressure gauge, the control valve A, the control valve B, the first grouting channel and the second grouting channel. The quantity of the bucket is consistent with the number of fluid components, the quantity of the suction port of the grouting pump is the same as the quantity of the material bucket, and the pressure gauge is arranged at the outlet of the grouting pump. After inhaling and mixing the components in each bucket evenly, the grouting pump flows to the first grouting channel and the second grouting channel respectively through the outlet port, the first grouting channel leads to two elastic filling cavities in turn, the second grouting channel leads to the grouting space, and the control valve A is provided on the first grouting channel, and the control valve B is provided on the second grouting channel.
[0037] The fluid used for filling is a non-Newtonian fluid.
[0038] The components of the non-Newtonian fluid include polyacrylamide and a cross-linking agent.
[0039] A liquid colloid formed by the mixed reaction of polyacrylamide with cross-linker agent. With the increase of reaction time, the viscosity of the colloid increases with the increase of time, and becomes a paste with poor flowability after 2 hours. After one week, the viscosity reaches the maximum, and then the viscosity does not change, and finally exists in the state of high viscosity mobile colloid between coal seam fissures.
-72019101682 23 Dec 2019 [0040] After the grouting is stopped in the elastic filling cavity, the mixed reactants of polyacrylamide and cross-linker agent continue to expand and squeeze the drilling wall. The space between the two elastic filling cavities is effectively blocked.
[0041] After the grouting is stopped in the grouting space, the mixed reactants of polyacrylamide and cross-linker agent continue to expand. Under the action of expansion pressure, the fluid continues to permeate the cracks in the bored coal wall to realize sealing.
[0042] The elastic filling cavity is a rubber capsule. The expansive rubber capsule at both ends is used to seal the fluid in the grouting space between the two, the fluid permeates the cracks in the coal seam, and the gas and air are sealed in vacuum. By adopting flexible sealing method, the deformation of high stress drilling can be changed adaptively, the gas and air leakage can be prevented, and the negative pressure of pumping can be improved.
[0043] Embodiment [0044] The invention relates to a fluid-based piecewise filling grouting sealing method. The structure diagram of the grouting device and the sealing device is shown in Fig. 1. The method includes the following steps:
[0045] In the first step, the two rubber capsules are respectively connected to the two proximal ends of the gas drainage pipe, and the gas drainage pipe, together with two rubber capsules, is placed in the hole, and the grouting pump is started, so that the polyacrylamide and cross-linker agent in the A bucket and the B bucket are inhaled and fully mixed in the grouting pump. The control valve A on the first grouting channel is opened, and the glue in the grouting pump is grouting to the capsule at both ends of the hole through the first grouting channel, when the outlet pressure on the grouting pump reaches 1 .0-1 .5MPa, the control valve A is closed, and the gap between the drainage pipe and the drilling wall is sealed after the expansion of the two elastic filling cavities. After stopping the grouting,
- 8 2019101682 23 Dec 2019 the mixed reactants of polyacrylamide and cross-linker agent continue to expand and squeeze the drilling wall.
[0046] In the second step, the control valve B on the second grouting channel is opened, and the grouting space reserved between the two rubber capsules is grouting through the second grouting channel. When the pressure reaches 0 .5-1 .OMPa , the control valve B is closed and the grouting pump is stopped, so that the fluid filled with grouting space permeates the cracks around the hole under the action of pressure, and the drilling hole is sealed.
[0047] The third step, when the sealing effect of the two rubber capsules is reduced, the two elastic filling cavities are filled with secondary filling.
[0048] In the fourth step, when the sealing effect of grouting space is reduced, the secondary grouting is carried out into the grouting space.
[0049] It will be understood that the term “comprise” and any of its derivatives (eg comprises, comprising) as used in this specification is to be taken to be inclusive of features to which it refers, and is not meant to exclude the presence of any additional features unless otherwise stated or implied.
[0050] The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that such prior art forms part of the common general knowledge.
[0051] It will be appreciated by those skilled in the art that the invention is not restricted in its use to the particular application described. Neither is the present invention restricted in its preferred embodiment with regard to the particular elements and/or features described or depicted herein. It will be appreciated that various modifications can be made without
-92019101682 23 Dec 2019 departing from the principles of the invention. Therefore, the invention should be understood to include all such modifications in its scope.
Claims (7)
1. A fluid-based segmented filling grouting sealing method, which is characterized in that the method comprises the following steps: in the first step, two elastic filling cavities are respectively connected to the two proximal ends of the gas drainage pipe, the gas drainage pipe is placed in the hole together with two elastic filling cavities, and the fluid is filled into the two elastic filling cavities respectively, and the gap between the drainage pipe and the drilling wall is sealed after the expansion of the two elastic filling cavities;
In the second step, the fluid is filled into the grouting space reserved between the two elastic filling cavities, and the fluid is filled with the fluid through the grouting pressure, and the fluid is pressed into the cracks around the hole by the grouting pressure.
In the third step, when the sealing effect of the two elastic filling cavities is reduced, the secondary grouting is carried out into the two elastic filling cavities;
In the fourth step, when the sealing effect of the grouting space is reduced, the secondary grouting is performed into the grouting space.
2. According to claims 1, the fluid-based segmented filling grouting and sealing method is characterized in that: in the first and third steps, when the pressure in the elastic filling cavity reaches 1 .0-1 .5Mpa, the grouting is stopped, and in the second and fourth steps, when the pressure in the grouting space reaches 1 .0-1 .5Mpa, the grouting is stopped.
3. According to claims 1, the fluid-based segmented filling grouting and sealing method is characterized in that: the grouting device is used in the grouting process, and the grouting device comprises a bucket, a grouting pump, and a pressure gauge, a control valve A, a control valve B, the first grouting channel and the second grouting channel, the quantity of the bucket is consistent with the number of fluid components, and the number of suction ports of the grouting pump is consistent with the number of buckets. The pressure gauge is located at the outlet of the grouting pump. After inhaling and mixing the components in each bucket evenly, the grouting pump flows to the first grouting channel and the second grouting channel respectively through the discharge port, the first grouting channel leads to two elastic filling
-11 2019101682 23 Dec 2019 cavities in turn, the second grouting channel leads to the grouting space, and the control valve A is provided on the first grouting channel and the control valve B is provided on the second grouting channel.
4. According to claims 1, the fluid-based segmented filling grouting and sealing method for sealing holes is characterized in that the fluid used for filling is a non-Newtonian fluid, the components of which include polyacrylamide and a crosslinking agent, a fluid-like compound formed after mixed reaction of polyacrylamide and cross-linker. With the increase of reaction time, the viscosity of the colloid increases with the increase of time, and becomes a paste with poor flowability after 2 hours. After one week, the viscosity reaches the maximum, and then the viscosity does not change, and finally exists in the state of high viscosity mobile colloid between coal seam fissures.
5. According to claims 5, the fluid-based segmented filling grouting and sealing method for sealing holes is characterized in that the mixed reactants of polyacrylamide and cross-linker continue to expand and extrude the drilling wall after the grouting is stopped in the elastic filling cavity.
6. According to claims 5, the fluid-based segmented filling grouting and sealing method for sealing holes is characterized in that the mixed reactant of polyacrylamide and cross-linker continues to expand after grouting is stopped in the grouting space, and under the action of expansion pressure, the fluid continues to penetrate into the fractures of the borehole coal wall to achieve sealing.
7. According to claims 1, the fluid-based segmented filling grouting and sealing method for sealing holes is characterized in that the elastic filling cavity is a rubber capsule, the expansive rubber capsule inflated at both ends is used to block the injection between the two, the fluid permeates the cracks in the coal seam, and a vacuum seal is formed against the gas and air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2019101682A AU2019101682A4 (en) | 2019-12-23 | 2019-12-23 | Fluid-based segmented filling grouting sealing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2019101682A AU2019101682A4 (en) | 2019-12-23 | 2019-12-23 | Fluid-based segmented filling grouting sealing method |
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| Publication Number | Publication Date |
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| AU2019101682A4 true AU2019101682A4 (en) | 2020-02-13 |
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| AU2019101682A Ceased AU2019101682A4 (en) | 2019-12-23 | 2019-12-23 | Fluid-based segmented filling grouting sealing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108609A (en) * | 2021-09-29 | 2022-03-01 | 华北水利水电大学 | Goaf multistage subsection precise filling deep pile-forming construction process and method |
| CN114837604A (en) * | 2022-05-25 | 2022-08-02 | 安徽理工大学 | Soft coal seam working face segmented grouting system and advanced grouting method |
| CN115234193A (en) * | 2022-08-04 | 2022-10-25 | 紫金矿业集团股份有限公司 | Plugging method of moving water fixed pipe plugging device for drilling water inrush |
-
2019
- 2019-12-23 AU AU2019101682A patent/AU2019101682A4/en not_active Ceased
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108609A (en) * | 2021-09-29 | 2022-03-01 | 华北水利水电大学 | Goaf multistage subsection precise filling deep pile-forming construction process and method |
| CN114108609B (en) * | 2021-09-29 | 2023-03-10 | 华北水利水电大学 | Construction method for multistage segmented precise filling and deep pile forming in goaf |
| CN114837604A (en) * | 2022-05-25 | 2022-08-02 | 安徽理工大学 | Soft coal seam working face segmented grouting system and advanced grouting method |
| CN114837604B (en) * | 2022-05-25 | 2023-09-22 | 安徽理工大学 | Segmented grouting system and advanced grouting method for soft coal seam working face |
| CN115234193A (en) * | 2022-08-04 | 2022-10-25 | 紫金矿业集团股份有限公司 | Plugging method of moving water fixed pipe plugging device for drilling water inrush |
| CN115234193B (en) * | 2022-08-04 | 2023-05-26 | 紫金矿业集团股份有限公司 | Plugging method of movable water-fixing pipe plugging device for water burst of drilling hole |
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