CN110725700B - Coal seam spraying reinforcement and graded glue injection cooperative hole sealing method - Google Patents
Coal seam spraying reinforcement and graded glue injection cooperative hole sealing method Download PDFInfo
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- CN110725700B CN110725700B CN201910924103.XA CN201910924103A CN110725700B CN 110725700 B CN110725700 B CN 110725700B CN 201910924103 A CN201910924103 A CN 201910924103A CN 110725700 B CN110725700 B CN 110725700B
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- glue injection
- hole
- coal seam
- gas extraction
- hole sealing
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- 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
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
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- 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
- E21B33/12—Packers; Plugs
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- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention discloses a coal seam spraying reinforcement and grading glue injection cooperative hole sealing method, and relates to the technical field of coal seam cooperative hole sealing methods. The hole sealing method comprises the steps of firstly spraying and reinforcing the wall surface of a roadway, then constructing bedding gas extraction drill holes and injecting glue for sealing holes, and finally injecting glue for sealing fracture zones into the glue injection drill holes on the two sides of the gas extraction drill holes through glue injection pipes; and (5) when the gas concentration is gradually reduced to a certain value along with the extraction, injecting colloid into the injection drill hole through the injection pipe again to plug the secondary cracks. According to the coal seam spraying reinforcement and grading glue injection cooperative hole sealing method disclosed by the invention, the hole sealing is realized in a way of combining the tunnel wall spraying reinforcement and the hole injection, the operation is simple, the cost is low, the safety is high, and the effect is good.
Description
Technical Field
The invention relates to the technical field of coal seam cooperative hole sealing methods, in particular to a coal seam spraying reinforcement and graded glue injection cooperative hole sealing method.
Background
With the gradual exhaustion of shallow coal resources, the mining of deep coal resources will become a normal state in the future. But after entering the deep part, the coal bed has high gas content and high pressure, and seriously threatens the safe production of the mine. The coal bed gas is a clean and efficient energy source and strong greenhouse gas, and according to statistics, the amount of coal bed gas resources buried more than 2000m in China is about 36.81 trillion m3And the third place in the world. The coal bed gas resource with the burial depth of 1000-2000 m accounts for 61.2% of the total amount of the coal bed gas resources in China, and the method has extremely high mining value. Therefore, the realization of the efficient development of the coal bed gas has important significance for guaranteeing the mining safety, realizing the resource utilization and protecting the environment.
After the coal seam roadway is excavated, the stress balance state of the coal body is broken, and further the coal body around the roadway is broken under the action of stress to form a fracture zone. After the construction of the gas extraction drill hole and the grouting drill hole is completed, due to the disturbance and pressure relief effect in the drilling process, more cracks are formed around the drill hole on the basis of the original crack zone, and the gas extraction effect is influenced. Based on the problem, people propose to improve the gas extraction effect and the extraction concentration of the coal seam drill hole by means of grouting and hole sealing. But the traditional slip casting hole sealing mode is mostly disposable slip casting, and the hole sealing effect is poor, and is not obvious to the effect that improves gas drainage.
Therefore, in order to improve the coal seam borehole gas extraction effect and the extraction concentration, a brand new gas extraction borehole sealing method is urgently needed to meet the requirements of underground coal mine borehole sealing.
Disclosure of Invention
The invention aims to provide a coal seam spraying reinforcement and grading glue injection cooperative hole sealing method, which comprises the following steps:
s1, forming a fracture zone on the wall surface and the periphery of a roadway after the coal seam roadway is excavated, spraying slurry on the wall of the roadway, reinforcing the wall of the roadway, and forming an isolation barrier to primarily plug the roadway wall mining-induced fracture.
And S2, constructing a gas extraction borehole and an injection borehole in the direction from the wall of the roadway to the coal seam by using a drilling device according to the operation requirement.
And S3, placing an extraction pipe in the gas extraction drill hole and plugging the hole opening by using a hole sealing device.
S4, placing a third plug into the orifice of the glue injection drill hole, placing the glue injection pipe into the glue injection drill hole through the third plug, injecting glue into the drill hole with pressure through the glue injection pipe, and blocking the mining-induced crack.
And S5, connecting the gas extraction pipe into an extraction system for gas extraction.
And S6, after a certain period of time for extraction, because the coal matrix shrinks and cracks increase due to desorption flow of coal seam gas, injecting colloid into the coal seam again through the injection pipe to plug the secondary cracks.
And S7, continuing gas extraction until the extraction work is finished.
Preferably, the depth of the gas extraction drill hole in S2 is 100-150m, the diameter is 113mm, and the distance between two adjacent gas extraction drill holes is 2-4 m; the depth of the injection drilling hole is 10-15m, and the diameter is 75 mm; the gas extraction drill holes and the glue injection drill holes are alternately arranged, and the distance between every two adjacent gas extraction drill holes and the distance between every two adjacent glue injection drill holes are 1-2 m.
Preferably, the hole sealing device in S3 includes a hole sealing capsule, a water injection pipe, and a first plug and a second plug arranged in front and back; firstly, fixedly installing a first plug on an extraction pipe and extending into a gas extraction drill hole, then placing a hole sealing capsule and a water injection pipe, and finally placing a second plug into the hole opening of the gas extraction drill hole after penetrating through the water injection pipe and the extraction pipe; the water injection pipe is connected with the water pump for water injection, and the hole sealing capsule, the first plug and the second plug expand when encountering water to seal the hole opening to form a hole sealing section.
Preferably, the length of the hole sealing section in the gas extraction drill hole in the S3 is equal to that of the glue injection drill hole.
Preferably, the glue injection pressure in S3 is 1-3 MPa.
Compared with the prior art, the coal seam spraying reinforcement and graded glue injection cooperative hole sealing method disclosed by the invention has the advantages that:
(1) the roadway wall is sprayed and reinforced and the cracks around the drill hole can be effectively blocked by the aid of the method of combining the roadway wall spraying and reinforcing with the drill hole glue injection, meanwhile, wall surface air leakage and drill hole deformation are effectively prevented by the aid of spraying and reinforcing, and the roadway wall is easy to operate, low in cost, high in safety and good in effect.
(2) The two-stage glue injection mode can well block secondary cracks generated by coal matrix shrinkage due to desorption and flowing of coal seam gas, remarkably improve the coal seam drilled gas extraction effect and extraction concentration, save coal seam gas extraction and further improve the coal seam mining efficiency.
Drawings
For a clearer explanation of the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described 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 a person skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of an embodiment of the present invention.
The part names represented by the numbers or letters in the drawings are:
1-pumping pipe; 2-glue injection pipe; 3, gas extraction drilling; 4-drilling holes by injecting glue; 5-a second plug; 6-third plug; 7-a first plug; 8-an isolation barrier; 9-colloid; 10-sealing capsules; and 11, a water injection pipe.
Detailed Description
The following provides a brief description of embodiments of the present invention with reference to the accompanying drawings. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any inventive work belong to the protection scope of the present invention.
Fig. 1 shows a preferred embodiment of the present invention, which is parsed in detail.
The method for cooperatively sealing holes of coal seam spraying reinforcement and graded glue injection as shown in fig. 1 comprises the following steps:
step one, forming a fracture zone on the wall surface of the roadway and the periphery of the roadway after the coal seam roadway is excavated, spraying slurry on the wall of the roadway, reinforcing the wall of the roadway, and forming an isolation barrier 8 to initially plug the roadway wall mining fracture and isolate air.
And step two, constructing a gas extraction borehole 3 and a glue injection borehole 4 in the direction from the wall of the roadway to the coal seam by using a drilling device according to the operation requirement. Wherein the depth of the gas extraction drill hole 3 is 100-150m, the diameter is 113mm, and the distance between two adjacent gas extraction drill holes 3 is 2-4 m; the depth of the glue injection drill hole 4 is 10-15m, and the diameter is 75 mm; the gas extraction drill holes 3 and the glue injection drill holes 4 are alternately arranged, and the distance between every two adjacent gas extraction drill holes 3 and the distance between every two adjacent glue injection drill holes 4 are 1-2 m.
And step three, placing the extraction pipe 1 in the gas extraction drill hole 3 and plugging the hole opening by using a hole sealing device. Specifically, the hole sealing device comprises a hole sealing capsule 10, a water injection pipe 11, a first plug 7 and a second plug 5 which are arranged in front and back; firstly, fixedly installing a first plug 7 on an extraction pipe 1 and extending into a gas extraction borehole 3, then placing a hole sealing capsule 10 and a water injection pipe 11, and finally placing a second plug 5 into an orifice of the gas extraction borehole 3 through the water injection pipe 11 and the extraction pipe 1; the water injection pipe 11 is connected with the water pump for water injection, and the hole sealing capsule 10, the first plug 7 and the second plug 5 expand when encountering water to seal the hole opening to form a hole sealing section. The length of the hole sealing section in the gas extraction drill hole 3 is equal to that of the glue injection drill hole 4.
And fourthly, placing a third plug 6 into an orifice of the glue injection drill hole 4, placing the glue injection pipe 2 into the glue injection drill hole 4 through the third plug 6, injecting the colloid 9 into the glue injection drill hole 4 with pressure through the glue injection pipe 2, and blocking the mining-induced fracture. Wherein the glue injection pressure is 1-3 MPa. The glue injection duration is comprehensively determined according to the actual depth of the glue injection drill hole 4, the glue injection rate, the width of the fracture zone and the like.
And step five, connecting the gas extraction pipe 1 into an extraction system for gas extraction.
And step six, after five hours of extraction, because the concentration of the extracted gas is reduced and the coal bed gas is desorbed and flows to cause the shrinkage of the coal matrix and increase the cracks, injecting the colloid 9 into the coal bed again through the glue injection pipe 2 to plug the secondary cracks. The extraction time can be determined according to the concentration of the extracted gas.
And seventhly, continuing gas extraction until the extraction work is finished.
In conclusion, the coal seam spraying reinforcement and grading glue injection cooperative hole sealing method disclosed by the invention realizes the plugging of the drilled hole in a way of combining the spraying reinforcement of the roadway wall and the glue injection of the drilled hole, and has the advantages of simple operation, low cost, high safety and good effect. Meanwhile, a two-stage glue injection mode is adopted, secondary cracks generated by coal matrix shrinkage due to desorption and flowing of coal bed gas are better plugged, and the coal bed drilled gas extraction effect and the extraction concentration are further improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A coal seam spraying reinforcement and grading glue injection cooperative hole sealing method is characterized by comprising the following steps:
s1, forming a fracture zone on the wall surface and the periphery of a roadway after the coal seam roadway is excavated, spraying slurry on the wall of the roadway, reinforcing the wall of the roadway, and forming an isolation barrier (8) to primarily block the roadway wall mining-induced fracture;
s2, constructing a gas extraction borehole (3) and an injection borehole (4) in the direction from the wall of the roadway to the coal seam by using a drilling device according to the operation requirement;
s3, placing an extraction pipe (1) in the gas extraction drill hole (3) and plugging an orifice by using a hole sealing device; the hole sealing device comprises a hole sealing capsule (10), a water injection pipe (11), a first plug (7) and a second plug (5) which are arranged in front and back; firstly, a first plug (7) is fixedly arranged on an extraction pipe (1) and extends into a gas extraction drill hole (3), then a hole sealing capsule (10) and a water injection pipe (11) are placed, and finally a second plug (5) penetrates through the water injection pipe (11) and the extraction pipe (1) and is placed into an orifice of the gas extraction drill hole (3); the water injection pipe (11) is connected with a water pump for injecting water, the hole sealing capsule (10), the first plug (7) and the second plug (5) expand when meeting water, and the hole opening is sealed to form a hole sealing section;
s4, placing a third plug (6) into an orifice of the glue injection drill hole (4), placing the glue injection pipe (2) into the glue injection drill hole (4) through the third plug (6), and injecting a colloid (9) into the glue injection drill hole (4) through the glue injection pipe (2) in a pressing mode to plug the mining crack;
s5, connecting the gas extraction pipe (1) into an extraction system for gas extraction;
s6, after a certain period of time for extraction, because the coal matrix shrinks and cracks increase due to desorption flow of coal seam gas, injecting colloid (9) into the coal seam again through the glue injection pipe (2) to block secondary cracks;
and S7, continuing gas extraction until the extraction work is finished.
2. The method for the cooperative hole sealing of the coal seam by spraying, reinforcing and grading glue injection according to claim 1, characterized in that the depth of the gas extraction drill hole (3) in S2 is 100-150m, the diameter is 113mm, and the distance between two adjacent gas extraction drill holes (3) is 2-4 m; the depth of the glue injection drill hole (4) is 10-15m, and the diameter is 75 mm; the gas extraction drill holes (3) and the glue injection drill holes (4) are alternately arranged, and the distance between every two adjacent gas extraction drill holes (3) and every two adjacent glue injection drill holes (4) is 1-2 m.
3. The method for spraying, reinforcing and grading glue injection cooperative hole sealing of the coal seam according to claim 1, characterized in that the length of the hole sealing section in the gas extraction drill hole (3) in S3 is equal to the length of the glue injection drill hole (4).
4. The method for cooperatively sealing the hole of the coal seam by spraying, reinforcing and grading glue injection according to claim 1, wherein the glue injection pressure in S3 is 1-3 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910924103.XA CN110725700B (en) | 2019-09-27 | 2019-09-27 | Coal seam spraying reinforcement and graded glue injection cooperative hole sealing method |
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| CN201910924103.XA CN110725700B (en) | 2019-09-27 | 2019-09-27 | Coal seam spraying reinforcement and graded glue injection cooperative hole sealing method |
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| CN110725700A CN110725700A (en) | 2020-01-24 |
| CN110725700B true CN110725700B (en) | 2020-11-10 |
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| CN111794711B (en) * | 2020-08-03 | 2023-08-08 | 河南理工大学 | High-pressure circulating grouting hole sealing device for gas extraction drilling and use method thereof |
| CN112360502B (en) * | 2020-09-28 | 2022-12-20 | 中煤科工开采研究院有限公司 | Coal roadway rapid tunneling method and equipment based on spray layer and atmospheric pressure |
| CN113605960B (en) * | 2021-08-04 | 2023-03-10 | 煤炭科学研究总院有限公司 | Method and device for preventing coal spontaneous combustion induced by coal bed gas extraction |
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| US8371384B2 (en) * | 2010-03-31 | 2013-02-12 | Halliburton Energy Services, Inc. | Methods for strengthening fractures in subterranean formations |
| CN102251797A (en) * | 2011-06-21 | 2011-11-23 | 高珍会 | Device and method for gas drilling, cementing and hole sealing for coal mines |
| CN102900396B (en) * | 2012-11-01 | 2014-12-10 | 中国矿业大学 | Method for integrally sealing and separating gas extraction drilled hole in coal seam |
| CN103899268A (en) * | 2014-04-08 | 2014-07-02 | 中煤科工集团重庆研究院有限公司 | Method for improving hole sealing performance in gas extraction |
| CN108060903B (en) * | 2017-11-24 | 2019-01-08 | 山东科技大学 | Coal-bed gas pressure measures dynamic self-balance pressurization hole sealing device and method |
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