CN112593936A - Advanced comprehensive prevention and control method for multiple disaster areas of deep mine - Google Patents
Advanced comprehensive prevention and control method for multiple disaster areas of deep mine Download PDFInfo
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- CN112593936A CN112593936A CN202011363593.XA CN202011363593A CN112593936A CN 112593936 A CN112593936 A CN 112593936A CN 202011363593 A CN202011363593 A CN 202011363593A CN 112593936 A CN112593936 A CN 112593936A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000002265 prevention Effects 0.000 title claims description 8
- 239000011435 rock Substances 0.000 claims abstract description 51
- 239000003245 coal Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 22
- 238000005422 blasting Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 4
- 239000003034 coal gas Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000001028 reflection method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000002817 coal dust Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 abstract description 3
- 230000009977 dual effect Effects 0.000 abstract 1
- 238000005065 mining Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
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- 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
- E21F16/00—Drainage
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- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- 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
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Abstract
The invention discloses an advanced comprehensive control method for a multi-disaster area of a deep mine, which comprises the steps of determining the position of a target rock stratum; constructing a horizontal well on the ground, and starting deflecting from a vertical well to a target rock stratum; then drilling and perforating the target rock stratum, and fracturing after perforation; after the rock stratum fracturing is finished, extending the vertical shaft and deflecting to the central line of the coal seam; performing coal seam hydraulic staged fracturing after reaching the central line of the coal seam; gas is pumped out or water is drained after the hydraulic fracturing is finished; the control method can realize comprehensive regional control of gas, water, coal dust and geothermal heat on the basis of regional rock burst control, realize dual purposes of one well, repeatedly utilize a vertical well section, construct 2L-shaped horizontal wells, reduce the cost of constructing the vertical well, and realize drainage of the whole life cycle of a coal bed and real zero emission of gas by establishing a gas drainage station on the ground.
Description
Technical Field
The invention belongs to the technical field of deep mine coal mining, and relates to an advanced comprehensive prevention and control method for a multi-disaster area of a deep mine.
Background
Rock burst is one of the main disasters faced by coal mining of deep mines, is getting more and more intense in China in recent years, and causes immeasurable loss to mines and personnel. At present, except for optimizing mining layout and mining protection layers, other measures are not obvious in prevention and control effect, meanwhile, a deep rock burst mine is often accompanied by various disasters such as high gas and thermal damage, and how to comprehensively solve the multiple disasters regionally becomes one of important problems in the field of coal mines.
Disclosure of Invention
The invention aims to provide an advanced comprehensive control method for a multi-disaster area of a deep mine, which can realize advanced comprehensive control on the multi-disaster area of rock burst, gas, coal dust and water damage and realize safe and efficient mining of the mine.
The technical scheme adopted by the invention is that the advanced comprehensive prevention and control method for the multiple disaster areas of the deep mine is implemented according to the following steps:
step 1, determining the position of a target rock stratum;
step 2, constructing a horizontal well on the ground, constructing a vertical well to a position above a target rock stratum, and starting deflecting and horizontally drilling to the target rock stratum;
step 3, drilling and perforating the target rock stratum, and fracturing after perforation;
step 4, after the rock stratum fracturing is finished, extending the vertical shaft, deflecting and horizontally drilling to the central line of the coal seam;
step 5, performing coal seam hydraulic staged fracturing after reaching the center line of the coal seam;
and 6, pumping gas or draining water during the hydraulic fracturing and after the fracturing in the step 5.
The invention is also characterized in that:
the specific method for determining the position of the target rock stratum in the step 1 comprises the following steps: determining the position of a mine overburden rock key layer according to the mine geological comprehensive histogram, the heights of a cross-over zone and a fracture zone and the position of a seismic source of a microseismic event, wherein the overburden rock key layer is a hydraulic fracturing target rock layer;
in the step 3, a drill bit is accurately controlled to perform directional long-distance horizontal drilling perforation on the horizontal section of the L-shaped horizontal well by utilizing a comprehensive geosteering drilling technology, the horizontal section is arranged at the lower part of a overburden rock key layer, high-pressure water is injected into a perforation port of a two-stage packer for fracturing, and the whole body is fractured in a retreating mode;
in step 4, after hydraulic fracturing of the rock stratum section is finished in step 3, drilling downwards in the vertical shaft section, deflecting and horizontally drilling to the center of the coal seam, and accurately controlling the drill bit to directionally and horizontally drill in the middle of the coal seam for a long distance by using a comprehensive geological guiding drilling technology;
the specific content of the step 5 is as follows: performing coal seam hydraulic staged fracturing after the coal seam is drilled to the designated position in the step 4, reducing the dosage of the bullet holes according to the thickness and the hardness of the coal seam or directly injecting high-pressure water between two stages of packers for fracturing without adopting a projectile;
the specific content of the step 6 is as follows: during and after the hydraulic fracturing, the ground gas drainage station and the underground gas drainage pipe are matched to pre-pump coal gas, and when the coal face is pushed to pass through the fracturing section, the ground gas drainage station can continuously drain gas in the goaf through the vertical shaft section;
if the mine aquifer is located in the two zones of the caving zone and the fissure zone, conducting sectional fracturing of a horizontal well on the construction ground of the key layer of the overlying rock, conducting fissure water or the aquifer, accurately determining the lowest point of the main fissure of the fractured zone by using a geological radar method and a seismic reflection method, constructing a directional roof for blasting, introducing the roof water into a roadway drainage ditch after blasting, and discharging water.
The invention has the beneficial effects that:
the advanced comprehensive control method for the multiple disaster areas of the deep mine can realize comprehensive area control of gas, water, coal dust and geothermal heat on the basis of area rock burst control, realize one-well dual-purpose, repeatedly utilize a vertical well section, construct 2L-shaped horizontal wells, reduce the cost for constructing the vertical well, and realize drainage of the coal seam in the whole life cycle and really realize zero emission of the gas by establishing a gas drainage station on the ground.
Drawings
Fig. 1 is a scene diagram of an implementation of the advanced comprehensive prevention and treatment method for a multi-disaster area of a deep mine.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides an advanced comprehensive prevention and control method for a multi-disaster area of a deep mine, which is implemented by the following steps:
step 1, determining the position of a target rock stratum:
determining the position of a mine overburden rock key layer according to the mine geological comprehensive histogram, the heights of a cross-over zone and a fracture zone and the position of a seismic source of a microseismic event, wherein the overburden rock key layer is a hydraulic fracturing target rock layer;
step 2, constructing an L-shaped horizontal well on the ground, and starting deflecting and horizontally drilling to a target rock stratum when a vertical well is constructed to a position above the target rock stratum;
step 3, drilling and perforating the target rock stratum, and fracturing after perforation:
the method comprises the steps that a drill bit is accurately controlled to perform directional long-distance horizontal drilling perforation on a horizontal section of an L-shaped horizontal well by utilizing a comprehensive geosteering drilling technology, the horizontal section is arranged at the lower part of a overburden rock key layer, high-pressure water is injected into a perforation port of a two-stage packer for fracturing, and the whole body is fractured in a retreating mode;
according to the analysis of the bearing capacity of a material mechanics compression component, the upper part of a key layer of the overburden rock is subjected to pressure, the lower part of the key layer of the overburden rock is subjected to tension, a horizontal section is arranged on the lower part of the key layer of the overburden rock, a plurality of regular fractures can be fractured from the lower part in advance, when a hydraulic fracturing section is located in a mining area, the key layer of the overburden rock can be regularly fractured along the hydraulic fracturing fractures under the influence of the dead weight of the overburden rock, and the rock is prevented from being suddenly fractured to induce;
and 4, after the rock stratum fracturing is finished, extending the vertical shaft and deflecting to the central line of the coal seam:
after the hydraulic fracturing of the rock stratum section is finished in the step 3, related instruments are removed, the vertical shaft section continues to drill downwards, the vertical shaft section is deviated and horizontally drilled to the center of the coal seam, and the directional long-distance horizontal drilling of the drill bit in the middle of the coal seam is accurately controlled by utilizing a comprehensive geological guiding drilling technology;
and 5, performing coal seam hydraulic staged fracturing after reaching the center line of the coal seam:
performing coal seam hydraulic staged fracturing after the coal seam is drilled to the designated position in the step 4, reducing the dosage of the bullet holes according to the thickness and the hardness of the coal seam or directly injecting high-pressure water between two stages of packers for fracturing without adopting a projectile; cracks are generated, the permeability of the coal body is increased, and the gas drainage quantity is improved;
and 6, pumping gas or draining water during and after the hydraulic fracturing in the step 5: as shown in fig. 1;
during and after the hydraulic fracturing, the ground gas drainage station and the underground gas drainage pipe pre-drain coal gas for a plurality of months in advance according to relevant regulations, and when the coal face is pushed to pass through the fracturing section, the ground gas drainage station can continuously drain the gas in the goaf through the vertical shaft section, so that zero gas emission is finally realized;
if the mine aquifer is located in the two zones of the caving zone and the fissure zone, rock water can flow into a working surface through a rock breaking fissure to cause a water permeation accident, the horizontal well staged fracturing on the overburden key layer construction ground is used for conducting fissure water or the aquifer, the lowest point of the main fissure of the fracturing area is accurately determined by using a geological radar method and an earthquake reflection method, directional roof blasting is conducted on the construction, the roof water is introduced into a roadway drainage ditch after blasting, and water discharge work is carried out in advance.
Claims (6)
1. An advanced comprehensive prevention and control method for a multi-disaster area of a deep mine is characterized by comprising the following steps:
step 1, determining the position of a target rock stratum;
step 2, constructing the vertical shaft to the position above the target rock stratum, and starting deflecting and horizontal drilling to the target rock stratum;
step 3, drilling and perforating the target rock stratum, and fracturing after perforation;
step 4, after the rock stratum fracturing is finished, extending the vertical shaft, deflecting and horizontally drilling to the central line of the coal seam;
step 5, performing coal seam hydraulic staged fracturing after reaching the center line of the coal seam;
and 6, pumping gas or draining water during the hydraulic fracturing and after the fracturing in the step 5.
2. The advanced comprehensive control method for the multiple disaster areas of the deep mine according to claim 1, wherein the specific method for determining the position of the target rock stratum in the step 1 is as follows: and determining the position of a mine overburden rock key layer according to the mine geological comprehensive histogram, the heights of the cross-over zone and the fracture zone and the position of a seismic source of the microseismic event, wherein the overburden rock key layer is a hydraulic fracturing target rock layer.
3. The advanced comprehensive control method for the multiple disaster areas of the deep mine according to claim 1, wherein in the step 3, a drill bit is precisely controlled by using a comprehensive geosteering drilling technology to perform directional long-distance horizontal drilling perforation on the horizontal section of the L-shaped horizontal well, the horizontal section is arranged at the lower part of a key layer of overburden rock, high-pressure water is injected into a two-stage packer at a perforation port to perform fracturing, and the whole fracturing is performed in a retreating mode.
4. The advanced comprehensive control method for the multiple disaster areas of the deep mine according to claim 1, wherein in the step 4, after the hydraulic fracturing of the rock stratum section is completed in the step 3, the vertical shaft section is drilled downwards, and then the vertical shaft section is drilled to the center of the coal seam in an inclined and horizontal mode, and the directional long-distance horizontal drilling of the drill bit in the middle of the coal seam is accurately controlled by using a comprehensive geosteering drilling technology.
5. The advanced comprehensive control method for the multiple disaster areas of the deep mine according to claim 1, wherein the specific content of the step 5 is as follows: and 4, performing hydraulic staged fracturing on the coal seam after the coal seam is drilled to the designated position in the step 4, and directly injecting high-pressure water between two stages of packers for fracturing according to the thickness and hardness of the coal seam to reduce the dosage of shot holes or without adopting a projectile.
6. The advanced comprehensive control method for the multiple disaster areas of the deep mine according to claim 1, wherein the specific content of the step 6 is as follows: during and after the hydraulic fracturing, the ground gas drainage station and the underground gas drainage pipe are matched to pre-pump coal gas, and when the coal face is pushed to pass through the fracturing section, the ground gas drainage station can continuously drain gas in the goaf through the vertical shaft section;
if the mine aquifer is located in the two zones of the caving zone and the fissure zone, conducting sectional fracturing of a horizontal well on the construction ground of the key layer of the overlying rock, conducting fissure water or the aquifer, accurately determining the lowest point of the main fissure of the fractured zone by using a geological radar method and a seismic reflection method, constructing a directional roof for blasting, introducing the roof water into a roadway drainage ditch after blasting, and discharging water.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113107583A (en) * | 2021-05-21 | 2021-07-13 | 中国矿业大学 | Thick and hard roof high-gas coal seam gas extraction system and extraction method |
| CN113847083A (en) * | 2021-10-28 | 2021-12-28 | 重庆大学 | Rock burst control method for high-position huge-thickness hard top plate area |
| CN114165196A (en) * | 2021-12-06 | 2022-03-11 | 中国矿业大学 | Comprehensive efficient extraction method for closing coal bed gas in-situ-goaf of coal mine |
| CN114278372A (en) * | 2021-12-31 | 2022-04-05 | 陕西正通煤业有限责任公司 | Guiding arrangement method for underground directional drilling area of ultra-thick water-rich layer |
| CN114704227A (en) * | 2022-04-08 | 2022-07-05 | 贵州省油气勘查开发工程研究院 | Gas pressure cracking mining method for primary coal and tectonic coal composite coal seam |
| CN114893161A (en) * | 2022-05-05 | 2022-08-12 | 陕西彬长孟村矿业有限公司 | Multi-layer position directional drilling combined arrangement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114893161A (en) * | 2022-05-05 | 2022-08-12 | 陕西彬长孟村矿业有限公司 | Multi-layer position directional drilling combined arrangement method |
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