CN109268060B - Explosion-injection integrated region outburst prevention method based on strong and weak structure - Google Patents
Explosion-injection integrated region outburst prevention method based on strong and weak structure Download PDFInfo
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- CN109268060B CN109268060B CN201811099800.8A CN201811099800A CN109268060B CN 109268060 B CN109268060 B CN 109268060B CN 201811099800 A CN201811099800 A CN 201811099800A CN 109268060 B CN109268060 B CN 109268060B
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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
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
Abstract
A blasting and injection integrated regional outburst prevention method based on a strong and weak structure belongs to an outburst prevention method for a coal mine underground region. Two rows of blasting injection holes are constructed from a bottom suction roadway of the pre-excavated roadway to two sides of the pre-excavated roadway, and loosening blasting, hydraulic fracturing and gas extraction operations are sequentially carried out. The loosening blasting enables the coal seam cracks to be rapidly expanded, and a flow channel is provided for water flow and gas. A large amount of water flow injected in the fracturing operation can displace gas in the coal seam, so that the gas can be transported along fracture channels generated by blasting, and the gas extraction operation is more efficient. After a series of operations of blasting, fracturing and extraction are completed, stress weak areas are formed at positions of blasting holes on two sides of the pre-excavation roadway, and then in the excavation process of the pre-excavation roadway, due to the fact that strong and weak coupling structures are formed on two sides of the roadway, buffer areas of coal bed stress are generated, and coal and gas outburst risks caused by the coal bed stress and gas pressure are effectively restrained.
Description
Technical Field
The invention relates to the technical field of coal and gas outburst and stress disaster prevention and control, in particular to a strong and weak structure-based explosion and injection integrated regional outburst prevention method suitable for a high-gas and low-permeability coal bed in a coal mine underground coal roadway tunneling process.
Background
In the process of tunneling a coal roadway under a coal mine, in order to prevent a stress disaster mainly caused by coal and gas outburst, cross-cut drill holes are often required to be constructed in the coal seam below or above the coal seam to extract gas in the coal seam. However, for a low-permeability coal seam, the development degree of the coal seam fracture is small, and the gas extraction effect is difficult to guarantee. After adopting common gas extraction measures, the coal and gas outburst danger in the coal roadway tunneling process still remains high. Therefore, a high-efficiency coal seam gas extraction method suitable for a low-permeability coal seam is needed to be found to prevent coal and gas outburst in the coal roadway tunneling process.
Disclosure of Invention
The technical problem is as follows: the invention aims to overcome the defects in the existing coal and gas outburst prevention and control technology and provides a burst injection integrated area outburst prevention method based on a strong and weak structure, which is simple, convenient to operate, safe and efficient.
The technical scheme is as follows: the invention relates to a burst injection integrated region outburst prevention method based on a strong and weak structure, which comprises the following steps of:
a. firstly, determining the position of a coal seam pre-digging roadway), and then constructing a roadway bottom suction roadway 20-30m below the pre-digging roadway;
b. constructing two rows of blasting injection holes upwards from a roadway bottom suction roadway, wherein the distance between the intersection point of the blasting injection holes and the coal seam bottom plate and the pre-digging roadway is Xm; conveying the mine explosive to the middle part of a coal bed in an explosive injection hole by using a PVC explosive conveying pipe, and mounting a lath below the mine explosive to prevent the explosive from sliding off;
c. hole sealing operation is carried out at the bottom plate of the coal seam by using a hole sealing device, water is injected into the blasting injection hole through a high-pressure pipe after hole sealing is finished, loosening blasting can be carried out after water is fully injected, and forward blasting is adopted for blasting;
d. drilling again along the blasting hole after blasting is finished by using a drilling machine, so that hole collapse and hole blocking of the blasting hole after blasting operation are prevented;
e. performing hydraulic fracturing on the detonation injection hole through a high-pressure pipe, wherein the hydraulic fracturing adopts static pressure hydraulic fracturing, a pressure gauge and a one-way valve are arranged on the outer side of the high-pressure pipe, and the pressure resistance of the high-pressure pipe is 10-100 MPa;
f. observing the reading of the pressure gauge, stopping fracturing when the injected water reaches a predetermined volume or a predetermined pressure, wherein the predetermined volume is 5-200m3；
g. When the blasting and injection holes at two sides of the pre-excavated roadway) are completely constructed and blasting and fracturing operations are completed, a strong and weak coal seam structure forming a pressure relief strip is generated at two sides of the pre-excavated roadway;
h. and then, constructing a common borehole in the coal seam according to a conventional process, and performing conventional gas extraction, wherein the gas extraction is continued until the tunneling operation position of the pre-excavated roadway (3) is started.
When the roadway bottom suction roadway is used as the roadway high suction roadway, the measure aiming at the bottom plate is changed into a top plate measure.
The explosion injection holes are drilled through the stratum, the explosion injection holes pass through the rock stratum and penetrate through the coal bed and are not less than 0.5m, the interval between the adjacent explosion injection holes in the same row is determined according to the condition of the coal bed), and the distance is 5-100 m.
The distance Xm is determined according to the size of the coal seam and the design protection range, and the value is 5-15 m.
Has the advantages that: due to the adoption of the technical scheme, the coal seam around the pre-driving roadway is firstly subjected to loosening blasting, so that the crack development of the coal seam is greatly promoted, the gas migration channel is added, and the problem of low permeability of the coal seam is well solved. Meanwhile, the loosening blasting also provides a water flow channel for later hydraulic fracturing, so that the effect of the hydraulic fracturing is more obvious. The hydraulic fracturing operation in the invention enables the cracks in the coal seam to further develop, meanwhile, the water flow can displace gas in the coal seam, the gas desorption of the coal seam is obvious, and the subsequent gas extraction operation is more smooth. Meanwhile, the blasting holes constructed in the invention generate strong and weak coal bed structures on two sides of the pre-driving roadway to form pressure relief strips, so that the generation of coal bed stress disasters can be effectively inhibited. Therefore, the coal seam gas extraction effect is greatly improved, and good safety guarantee is provided for coal roadway tunneling. The method is simple, convenient to operate, good in effect and wide in practicability in the technical field.
Drawings
FIG. 1 is a schematic vertical sectional view of the present invention;
FIG. 2 is a schematic view of the arrangement of the boreholes in a cross-section of a coal seam floor in accordance with the present invention;
FIG. 3 is an enlarged partial schematic view of the squib hole of the present invention;
in the figure: 1-coal bed, 2-rock stratum, 3-pre-digging roadway, 4-roadway bottom suction roadway, 5-explosion injection hole, 6-PVC powder feeding pipe, 7-explosive, 8-lath, 9-hole sealing device and 10-high pressure pipe.
Detailed Description
An embodiment of the platform of the present invention is further described below with reference to the accompanying drawings:
the invention relates to a burst injection integrated region outburst prevention method based on a strong and weak structure, which comprises the following specific steps:
a. firstly, determining the position of a pre-excavated roadway 3 of a coal seam 1, and then constructing a roadway bottom suction roadway 4 20-30m below the pre-excavated roadway 3;
b. two rows of blasting injection holes 5 are constructed upwards from the roadway bottom suction roadway 4, and the distance from the intersection point of the blasting injection holes 5 and the bottom plate of the coal seam 1 to the pre-driving roadway 3 is Xm; the distance Xm is determined according to the size of the coal seam 1 and the design protection range, and the value is 5-15 m. Conveying the mine explosive 7 to the middle part of the coal bed 1 in the explosion injection hole 5 by using a PVC explosive conveying pipe 6, and mounting a lath 8 below the mine explosive 7 to prevent the explosive 7 from sliding off; when the roadway bottom suction roadway 4 is used as a roadway high suction roadway, the measure aiming at the bottom plate is changed into a top plate measure; the explosion injection holes 5 are through-layer drill holes, pass through the rock stratum 2 and penetrate through the coal seam 1 to be not less than 0.5m, and the interval between adjacent explosion injection holes 5 in the same row is determined according to the condition of the coal seam 1 and is 5-100 m;
c. hole sealing operation is carried out on the bottom plate of the coal seam 1 by using a hole sealing device 9, water is injected into the blasting injection hole 5 through a high-pressure pipe 10 after hole sealing is finished, loosening blasting can be carried out after water is fully injected, and forward blasting is adopted for blasting;
d. drilling again along the blasting hole 5 after blasting is finished by using a drilling machine, so that hole collapse and hole blocking of the blasting hole 5 after blasting operation are prevented;
e. performing hydraulic fracturing on the explosion injection hole 5 through a high-pressure pipe 10, wherein the hydraulic fracturing adopts static pressure hydraulic fracturing, a pressure gauge and a one-way valve are arranged on the outer side of the high-pressure pipe 10, and the pressure resistance of the high-pressure pipe is 10-100 MPa;
f. observing the reading of the pressure gauge, stopping fracturing when the injected water reaches a predetermined volume or a predetermined pressure, wherein the predetermined volume is 5-200m3；
g. After the blasting and fracturing operations are completed and the blasting and grouting holes 5 on the two sides of the pre-driving roadway 3 are completely constructed, a strong and weak coal bed structure forming a pressure relief strip is generated on the two sides of the pre-driving roadway 3; due to the strong and weak coupling structures formed on the two sides of the roadway, a buffer area of coal bed stress is generated, so that the coal and gas outburst danger caused by the coal bed stress and the gas pressure is effectively inhibited;
h. and then, constructing a common borehole in the coal seam 1 according to a conventional process, and performing conventional gas extraction until the gas extraction is continued to a tunneling operation position where the pre-excavation roadway 3 is started.
Claims (1)
1. A burst injection integrated region outburst prevention method based on a strong and weak structure is characterized by comprising the following steps:
a. performing loosening blasting on a coal seam around a pre-excavated roadway, promoting the development of coal seam fractures, increasing a gas migration channel, and improving the low permeability problem of the coal seam, firstly determining the position of the pre-excavated roadway (3) of the coal seam (1), and then constructing a roadway bottom suction roadway (4) at a position 20-30m below the pre-excavated roadway (3);
b. two rows of blasting injection holes (5) are constructed upwards from the roadway bottom suction roadway (4), and the distance between the intersection points of the blasting injection holes (5) and the coal seam (1) bottom plate and the pre-digging roadway (3) is Xm; the distance Xm is determined according to the size of the coal seam (1) and the design protection range and is 5-15m, the mine explosive (7) is conveyed to the middle part of the coal seam (1) in the blasting injection hole (5) by a PVC (polyvinyl chloride) explosive conveying pipe (6), and a lath (8) is arranged below the mine explosive (7) to prevent the explosive (7) from sliding off; when the roadway bottom suction roadway (4) is used as a roadway high suction roadway, the measure aiming at the bottom plate is changed into a top plate measure; the explosion injection holes (5) are through-layer drilled holes, the holes penetrate through the rock stratum (2) and penetrate through the coal bed (1) and are not less than 0.5m, the interval between every two adjacent explosion injection holes (5) in the same row is determined according to the condition of the coal bed (1), and the distance is 5-100 m; c. hole sealing operation is carried out on a bottom plate of the coal seam (1) by using a hole sealing device (9), after hole sealing is finished, water is injected into the blasting injection hole (5) through a high-pressure pipe (10), hydraulic fracturing operation enables cracks in the coal seam to further develop, meanwhile, water flow can displace gas in the coal seam, loosening blasting can be carried out after water is filled, and forward blasting is adopted for blasting;
d. drilling again along the blasting hole (5) after blasting is finished by using a drilling machine, so that hole collapse and hole blocking of the blasting hole (5) caused by blasting operation are prevented;
e. performing hydraulic fracturing on the explosion injection hole (5) through a high-pressure pipe (10), wherein the hydraulic fracturing adopts static pressure hydraulic fracturing, a pressure gauge and a one-way valve are arranged on the outer side of the high-pressure pipe (10), and the pressure resistance of the high-pressure pipe is 10-100 MPa;
f. observing the reading of the pressure gauge, and stopping fracturing when the water injection reaches a preset volume or a preset pressure, wherein the preset volume is 5-200m for carrying out the plantation;
g. after the blasting and grouting holes (5) at the two sides of the pre-excavation roadway (3) are completely constructed and blasting and fracturing operations are completed, the blasting and grouting holes generate strong and weak coal seam structures forming pressure relief strips at the two sides of the pre-excavation roadway (3); due to the strong and weak coupling structures formed on the two sides of the roadway, a buffer area of coal bed stress is generated, so that the coal and gas outburst danger caused by the coal bed stress and the gas pressure is effectively inhibited;
h. and then, constructing a common borehole in the coal seam (1) according to a conventional process, and performing conventional gas extraction, wherein the gas extraction is continued until the tunneling operation position of the pre-excavated roadway (3) is started.
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| CN201811099800.8A CN109268060B (en) | 2018-09-20 | 2018-09-20 | Explosion-injection integrated region outburst prevention method based on strong and weak structure |
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| CN201811099800.8A CN109268060B (en) | 2018-09-20 | 2018-09-20 | Explosion-injection integrated region outburst prevention method based on strong and weak structure |
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| CN114607338B (en) * | 2022-03-21 | 2023-08-18 | 煤炭科学技术研究院有限公司 | Coal mine underground coal rock gas prevention and control composite dynamic disaster method and device |
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| CN102337919A (en) * | 2011-09-01 | 2012-02-01 | 河南理工大学 | Four-period-five-purpose hole-drilling high-efficiency gas extracting process |
| CN103195466A (en) * | 2013-03-30 | 2013-07-10 | 重庆大学 | Directional water pressure blasting method for improving coal bed gas permeability |
| CN103195468A (en) * | 2013-04-02 | 2013-07-10 | 重庆市能源投资集团科技有限责任公司 | System process for conducting efficient strengthened extraction in surrounding rock |
| CN107152303A (en) * | 2017-07-05 | 2017-09-12 | 安徽理工大学 | A kind of low ventilative high gas layer is by the method for the shielding efficient unloading pressure by blasting extraction in lane |
| CN107725020A (en) * | 2017-11-14 | 2018-02-23 | 中煤科工集团重庆研究院有限公司 | A kind of cherry coal rises to hydraulic fracturing anatonosis device and method step by step |
| CN107816365A (en) * | 2017-10-25 | 2018-03-20 | 中国矿业大学 | A kind of quick-fried pumping integration anti-burst method of coal seam drilling |
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- 2018-09-20 CN CN201811099800.8A patent/CN109268060B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102337919A (en) * | 2011-09-01 | 2012-02-01 | 河南理工大学 | Four-period-five-purpose hole-drilling high-efficiency gas extracting process |
| CN103195466A (en) * | 2013-03-30 | 2013-07-10 | 重庆大学 | Directional water pressure blasting method for improving coal bed gas permeability |
| CN103195468A (en) * | 2013-04-02 | 2013-07-10 | 重庆市能源投资集团科技有限责任公司 | System process for conducting efficient strengthened extraction in surrounding rock |
| CN107152303A (en) * | 2017-07-05 | 2017-09-12 | 安徽理工大学 | A kind of low ventilative high gas layer is by the method for the shielding efficient unloading pressure by blasting extraction in lane |
| CN107816365A (en) * | 2017-10-25 | 2018-03-20 | 中国矿业大学 | A kind of quick-fried pumping integration anti-burst method of coal seam drilling |
| CN107725020A (en) * | 2017-11-14 | 2018-02-23 | 中煤科工集团重庆研究院有限公司 | A kind of cherry coal rises to hydraulic fracturing anatonosis device and method step by step |
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