CN112593936B - Advanced comprehensive control method for multi-disaster area of deep mine - Google Patents
Advanced comprehensive control method for multi-disaster area of deep mine Download PDFInfo
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- CN112593936B CN112593936B CN202011363593.XA CN202011363593A CN112593936B CN 112593936 B CN112593936 B CN 112593936B CN 202011363593 A CN202011363593 A CN 202011363593A CN 112593936 B CN112593936 B CN 112593936B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 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 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 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 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 advanced comprehensive prevention and control method for a multi-disaster area of a deep mine, which is used for determining the position of a target rock stratum; constructing a horizontal well on the ground, and starting deflecting from the vertical well to the target rock stratum; then drilling and perforating the target stratum, and fracturing after perforation; after the formation fracturing is finished, extending a vertical shaft and deflecting to the central line of the coal bed; carrying out hydraulic staged fracturing on the coal seam after reaching the central line of the coal seam; after hydraulic fracturing is finished, gas is pumped out or water is drained; the control method can realize comprehensive regional control of gas, water, coal dust and geothermal energy on the basis of regional rock burst control, realize one-well dual-purpose, repeatedly use the vertical section, construct 2L-shaped horizontal wells, reduce the cost of constructing the vertical wells, and realize full life cycle drainage of the coal seam by establishing a gas drainage station on the ground, thereby truly realizing zero gas drainage.
Description
Technical Field
The invention belongs to the technical field of deep mine coal exploitation, and relates to a multi-disaster area advanced comprehensive control method for a deep mine.
Background
Rock burst is one of main disasters faced by deep mine coal mining, and has been increasingly developed in China in recent years, and immeasurable losses are caused to mines and personnel. The existing regional treatment measures are not obvious in prevention and control effects except for optimizing mining layout and mining protection layers, meanwhile, deep rock burst mines often accompany various disasters such as high gas and heat damage, and how to comprehensively solve the disasters regionally becomes one of important subjects in the field of coal mines.
Disclosure of Invention
The invention aims to provide a advanced comprehensive control method for a multi-disaster area of a deep mine, which can realize advanced comprehensive control for the multi-disaster area of rock burst, gas, coal dust and water disaster and realize safe and efficient mining of the mine.
The technical scheme adopted by the invention is that the advanced comprehensive control method for the multi-disaster area 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 above a target rock stratum, and starting deflecting and horizontally drilling the vertical well to the target rock stratum;
step 3, drilling and perforating the target rock stratum, and fracturing after perforation;
step 4, after the formation fracturing is finished, extending a vertical shaft, deflecting and horizontally drilling to the central line of the coal bed;
step 5, carrying out hydraulic staged fracturing on the coal seam after reaching the central line of the coal seam;
and 6, pumping and draining gas or water after the hydraulic fracturing period and the fracturing end 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 is as follows: determining the position of a key layer of the mine overburden according to the mine geological synthetic histogram, the height of a cross-falling zone and a fracture zone and the position of a microseismic event source, wherein the key layer of the overburden is a hydraulic fracturing target rock stratum;
in the step 3, the comprehensive geosteering technology is utilized to precisely control the directional long-distance horizontal drilling perforation of a drill bit at the horizontal section of the L-shaped horizontal well, the horizontal Duan Bu is placed at the lower part of a key layer of the overburden, high-pressure water is injected into a two-stage packer through a jet orifice for fracturing, and the whole is subjected to fracturing by adopting a retreating type;
in the step 4, after the hydraulic fracturing of the rock stratum section in the step 3 is completed, the vertical well section is continuously drilled downwards and then is inclined and horizontally drilled to the center of the coal seam, and the drill bit is precisely controlled to drill in the middle of the coal seam in a directional long-distance horizontal manner by utilizing the comprehensive geosteering drilling technology;
the specific content of the step 5 is as follows: drilling in the step 4 to reach the designated position, performing hydraulic staged fracturing of the coal seam, reducing the dosage of projectile holes according to the thickness and hardness of the coal seam or directly injecting high-pressure water between two stages of packers for fracturing without adopting projectiles;
the specific content of the step 6 is as follows: step 5, during and after hydraulic fracturing, the ground gas drainage station and the underground gas drainage pipe are matched to pre-drain coal gas, and when the coal face pushes the fracturing section, the ground gas drainage station can continuously drain the gas in the goaf through the vertical section;
if the mine aquifer is located in the range of the collapse zone and the fracture zone, the ground horizontal well is constructed on the overlying strata key layer to conduct staged fracturing, fracture water or the aquifer is conducted, the lowest point of the main fracture in the fracturing area is accurately determined by using a geological radar method and an earthquake reflection method, a directional roof is constructed to blast, and roof water is introduced into a roadway drainage ditch after blasting, so that water discharge work is carried out.
The beneficial effects of the invention are as follows:
the advanced comprehensive control method for the multi-disaster area of the deep mine can realize comprehensive area control of gas, water, coal dust and geothermal energy on the basis of regional rock burst control, realize one-well dual-purpose, repeatedly utilize the vertical section, construct 2L-shaped horizontal wells, reduce the cost of constructing the vertical wells, and realize drainage of the whole life cycle of the coal seam by establishing a gas drainage station on the ground, thereby truly realizing zero gas drainage.
Drawings
Fig. 1 is a diagram of an implementation scenario of a multi-disaster area advanced comprehensive control method for a deep mine.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention provides a method for advanced comprehensive control of 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 key layer of the mine overburden according to the mine geological synthetic histogram, the height of a cross-falling zone and a fracture zone and the position of a microseismic event source, wherein the key layer of the overburden is a hydraulic fracturing target rock stratum;
step 2, constructing an L-shaped horizontal well on the ground, constructing a vertical well above a target rock stratum, and starting deflecting and horizontally drilling the vertical well to the target rock stratum;
step 3, drilling and perforating the target rock stratum, and fracturing after perforation:
the method comprises the steps of accurately controlling a drill bit to directionally drill horizontally in a long distance in the horizontal section of an L-shaped horizontal well by utilizing a comprehensive geosteering drilling technology, placing a level Duan Bu at the lower part of a cover rock key layer, injecting high-pressure water into an injection hole opening in a two-stage packer for fracturing, and integrally adopting a retreating type for fracturing;
according to the bearing capacity analysis of the material mechanics compression member, the upper part of the overlying strata is stressed, the lower part of the overlying strata is pulled, the level Duan Bu is placed at the lower part of the overlying strata, a plurality of regular cracks can be pre-fractured at the lower part, when a hydraulic fracturing section is positioned in a mining area, the overlying strata can be regularly fractured along the hydraulic fracturing cracks under the influence of the dead weight of the overlying strata, and rock burst caused by large-area suspended roof sudden fracture of the strata is avoided;
and 4, after the formation fracturing is finished, extending the vertical shaft and deflecting to the central line of the coal bed:
after the hydraulic fracturing of the stratum section in the step 3 is completed, withdrawing the related instrument, continuing to drill the vertical section downwards and then deflecting and horizontally drilling to the center of the coal bed, and precisely controlling the drill bit to drill horizontally in the middle of the coal bed in a directional long distance by utilizing the comprehensive geosteering drilling technology;
step 5, carrying out hydraulic staged fracturing on the coal seam after reaching the central line of the coal seam:
drilling in the step 4 to reach the designated position, performing hydraulic staged fracturing of the coal seam, reducing the dosage of projectile holes according to the thickness and hardness of the coal seam or directly injecting high-pressure water between two stages of packers for fracturing without adopting projectiles; generating cracks, increasing the permeability of coal bodies and improving the gas drainage quantity;
step 6, pumping and draining gas or water after the hydraulic fracturing in the step 5: as shown in fig. 1;
step 5, during and after hydraulic fracturing, pre-pumping coal gas by a ground gas drainage station and a downhole gas drainage pipe according to relevant regulations in advance for a plurality of months, wherein when a coal face pushes and adopts a fracturing section, the ground gas drainage station can continuously drain gas in a goaf through a vertical section, and finally zero gas emission is realized;
if the mine aquifer is located in the range of the collapse zone and the fracture zone, rock water can flow into the working surface to cause a water permeable accident through rock breaking fracture gaps, the ground horizontal well is constructed on the key layer of the overlying strata to conduct staged fracturing, fracture water or the aquifer is accurately determined by using a geological radar method and an earthquake reflection method, a directional roof blasting is constructed on the lowest point of the main fracture of the fracturing area, and roof water is introduced into a roadway drainage ditch after blasting, so that water discharge work is performed in advance.
Claims (1)
1. The advanced comprehensive control method for the multi-disaster area of the deep mine is characterized by comprising the following steps of:
step 1, determining the position of a target rock stratum:
determining the position of a key layer of the mine overburden according to the mine geological synthetic histogram, the height of a cross-falling zone and a fracture zone and the position of a microseismic event source, wherein the key layer of the overburden is a hydraulic fracturing target rock stratum;
step 2, constructing a vertical shaft until the position above the target rock stratum begins deflecting and horizontally drilling into the target rock stratum;
step 3, drilling and perforating the target rock stratum, and fracturing after perforation:
the method comprises the steps of accurately controlling a drill bit to directionally drill horizontally in a long distance in the horizontal section of an L-shaped horizontal well by utilizing a comprehensive geosteering drilling technology, placing a level Duan Bu at the lower part of a cover rock key layer, injecting high-pressure water into an injection hole opening in a two-stage packer for fracturing, and integrally adopting a retreating type for fracturing;
and 4, after the formation fracturing is finished, performing extending vertical shaft, deflecting and horizontal drilling to the central line of the coal bed:
after the hydraulic fracturing of the stratum section in the step 3 is completed, the vertical section is continuously drilled downwards, then the horizontal drilling is performed to the center of the coal bed, and the drill bit is precisely controlled to perform directional long-distance horizontal drilling in the middle of the coal bed by utilizing the comprehensive geosteering drilling technology;
step 5, carrying out hydraulic staged fracturing on the coal seam after reaching the central line of the coal seam: drilling in the step 4 to reach the designated position, performing hydraulic staged fracturing of the coal seam, reducing the dosage of projectile holes according to the thickness and hardness of the coal seam or directly injecting high-pressure water between two stages of packers for fracturing without adopting projectiles;
step 6, after the hydraulic fracturing in step 5 is finished, gas or water is pumped out, and the specific contents are as follows: step 5, during and after hydraulic fracturing, the ground gas drainage station and the underground gas drainage pipe are matched to pre-drain coal gas, and when the coal face pushes the fracturing section, the ground gas drainage station can continuously drain the gas in the goaf through the vertical section;
if the mine aquifer is located in the range of the collapse zone and the fracture zone, the ground horizontal well is constructed on the overlying strata key layer to conduct staged fracturing, fracture water or the aquifer is conducted, the lowest point of the main fracture in the fracturing area is accurately determined by using a geological radar method and an earthquake reflection method, a directional roof is constructed to blast, and roof water is introduced into a roadway drainage ditch after blasting, so that water discharge work is carried out.
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| 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 |
| CN113847083B (en) * | 2021-10-28 | 2024-03-01 | 重庆大学 | Control method for rock burst of high-level 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 |
| CN114278372B (en) * | 2021-12-31 | 2023-10-10 | 陕西正通煤业有限责任公司 | Diversion arrangement method for underground directional drilling area of huge thick water-rich layer |
| CN114704227B (en) * | 2022-04-08 | 2023-08-11 | 贵州省油气勘查开发工程研究院 | Method for splitting and mining raw coal and structural coal by using composite coal bed gas pressure |
| 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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