CN108343400B - Method for extracting coal seam group gas by directional drilling bedding - Google Patents
Method for extracting coal seam group gas by directional drilling bedding Download PDFInfo
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- CN108343400B CN108343400B CN201810080230.1A CN201810080230A CN108343400B CN 108343400 B CN108343400 B CN 108343400B CN 201810080230 A CN201810080230 A CN 201810080230A CN 108343400 B CN108343400 B CN 108343400B
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- coal seam
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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
- E21B43/006—Production of coal-bed methane
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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
A method for extracting gas of a coal seam group by directional drilling bedding belongs to a coal mine gas treatment method. Respectively constructing directional drilling holes in each coal seam of the deep coal seam group at a certain angle in the ground or a roadway by using a directional drilling machine, changing the drilling direction of the directional drilling machine after the depth of the coal seam is reached, so that a drill bit drills into the coal seam at an angle parallel to the coal seam, and the distance of the directional drilling holes entering the coal seam is determined by a pre-designed mining range; then, respectively extracting gas in each coal seam of the coal seam group by using the directional drilling holes, and extracting the coal seam after the coal and gas outburst danger of the coal seam is eliminated; after the danger of coal and gas outburst is eliminated, the mining sequence of each coal bed in the coal bed group is not divided; during the extraction period of a certain coal seam, the pressure relief gas released due to the extraction influence can be extracted by utilizing directional drilling holes in other unexplored coal seams. The gas extraction device can improve the working efficiency, reduce the workload, save the cost, ensure high gas extraction rate and extraction concentration and facilitate the utilization of gas. The method is suitable for gas control of the coal seam group comprising two or more coal seams.
Description
Technical Field
The invention relates to a method for treating coal mine gas, in particular to a method for extracting coal seam group gas by directional drilling bedding.
Technical Field
Mine gas is one of main disasters threatening the safety production of coal mines, but simultaneously the gas is clean energy with abundant reserves. Nowadays, most coal mines in China are used for preventing and treating gas disasters through extraction, so that not only can the safe exploitation of coal resources be guaranteed, the utilization of high-efficiency clean energy of mine gas be promoted, but also the environment can be protected, and the triple benefits of safety, energy and environment of the extraction and utilization of the coal mine gas are realized.
At present, a plurality of mine wells adopt a protective layer mining method aiming at a coal seam group, namely, a coal seam without coal and gas outburst danger or with extremely low coal and gas outburst danger is selected as a first mining coal seam for mining, then, pressure relief gas in other coal seams with high gas outburst danger is extracted by utilizing close-distance cross-layer drilling holes to ensure the safe construction of a coal seam roadway, and after the coal roadway construction is finished, the gas in a mining working face is pre-extracted by combining with bedding drilling holes, so that the safe mining of each coal seam in the coal seam group is finally realized.
However, with the gradual reduction and exhaustion of shallow coal resources, the underground mining depth is larger and larger, and nowadays, a large number of mines enter the mining depth below kilometers in China. After deep mining, all coal seams in a coal seam group have higher coal and gas outburst danger due to the influence of complex geological environments such as high ground stress, high gas and high ground temperature, and no suitable coal seam is taken as a first mining coal seam. The method mainly comprises the steps of constructing a short-distance cross-layer drill hole and pre-pumping coal-layer gas by combining a cross-layer drill hole, wherein a top plate rock roadway or a bottom plate rock roadway is firstly constructed, then gas is pumped from the cross-layer drill hole in the coal layer construction in the rock roadway to ensure the safe tunneling of the coal-layer roadway, and after the coal roadway is excavated, the cross-layer drill hole is constructed to pump the gas of a working face together; in addition, because the extraction radius of the cross-layer drill hole is generally smaller, the aim of eliminating coal and gas outburst danger and ensuring safe tunneling of a coal roadway can be achieved only by constructing intensive cross-layer drill holes. The workload is high and the cost is rather high.
Object of the Invention
The invention aims to solve the problems in the prior art and provides a method for extracting the gas of a coal seam group by using a directional drilling bedding way, which has high gas extraction rate, is economical and practical and is easy to construct.
Technical scheme
The purpose of the invention is realized as follows: and respectively constructing directional drilling holes in each coal seam of the deep coal seam group by using a directional drilling machine on the ground or in a roadway according to a certain inclination angle, changing the drilling direction of the directional drilling machine after the depth of the coal seam is reached, so that a drill bit drills into the coal seam according to an angle parallel to the coal seam, and the distance of the directional drilling holes entering the coal seam is determined by a preset mining range. And then, respectively extracting gas in each coal seam of the coal seam group by using the directional drilling holes, and respectively extracting the gas after the outburst danger of the coal and the gas of the coal seams is eliminated.
After the danger of coal and gas outburst is eliminated, the mining sequence of each coal bed in the coal bed group is not separated in sequence. During the extraction period of a certain coal seam, the pressure relief gas released due to the extraction influence can be extracted by utilizing directional drilling holes in other unexplored coal seams.
The coal seam is more than or equal to two layers, and gas control is carried out on the coal seam group more than or equal to the two layers of coal seams.
The invention has the beneficial effects that: (1) by directional drilling in construction, the excavation of a roof rock roadway or a floor rock roadway is avoided, the workload is reduced, and the cost is saved; (2) the mining sequence of each coal seam in the coal seam group is not sequential, which coal seam eliminates the coal and gas outburst danger firstly, namely the coal seam can be mined firstly, the normal extraction of directional drill holes of other coal seams is not influenced, and the pressure relief gas released due to the mining influence can be extracted by utilizing the directional drill holes in other unexplored coal seams when the coal seam is mined; (3) the construction position of the directional drilling is not limited by the distance between the directional drilling and the coal seam, and a new idea is provided for drilling extraction and treatment of gas in the deep coal seam group; (4) the directional drilling machine is used for directional drilling, the positioning capacity of the drilling machine is strong, the construction cost is low, the engineering period is short, the working efficiency is greatly improved, the gas extraction rate and the extraction concentration are high, and the utilization of gas is convenient.
Drawings
FIG. l is a schematic cross-sectional view of the method of the present invention.
FIG. 2 is a schematic plan view of the method of the present invention.
FIG. 3 is a schematic gas flow cross-section of the process of the present invention.
FIG. 4 is a schematic plan view of the gas flow in the method of the present invention.
FIG. 5 is a schematic cross-sectional view of an upper coal seam mined by the method of the present invention.
FIG. 6 is a schematic cross-sectional view of a coal seam at the middle of a coal seam produced by the method of the present invention.
FIG. 7 is a schematic cross-sectional view of a lower coal seam mined by the method of the present invention.
In the figure, i, the upper coal seam is directionally drilled; 2. directional drilling of the middle coal seam; 3. drilling a lower coal seam in a directional manner; 4. an upper coal seam; 5. a middle coal seam; 6. a lower coal seam.
Detailed Description
The invention is suitable for implementing gas control on a coal seam group comprising two or more coal seams, and the specific implementation mode of the invention is described by taking the coal seam group comprising three coal seams as an example with reference to the attached drawings:
as shown in fig. 1, 2, 3 and 4, an upper coal seam directional drilling hole (1), a middle coal seam directional drilling hole (2) and a lower coal seam directional drilling hole (3) are respectively constructed in the ground or a roadway to an upper coal seam (4), a middle coal seam (5) and a lower coal seam (6) in a deep coal seam group at a certain inclination angle (30-90 degrees), the drilling direction of the directional drilling machine is changed after the depth of the corresponding coal seam is reached, a drill bit drills into the coal seam at an angle parallel to the corresponding coal seam, and the distances from the upper coal seam directional drilling hole (1), the middle coal seam directional drilling hole (2) and the lower coal seam directional drilling hole (3) to the upper coal seam (4), the middle coal seam (5) and the lower coal seam (6) are determined by a pre-designed mining range. And then, respectively extracting gas in the upper coal seam (4), the middle coal seam (5) and the lower coal seam (6) in the coal seam group by utilizing the upper coal seam directional drilling hole (1), the middle coal seam directional drilling hole (2) and the lower coal seam directional drilling hole (3), and respectively extracting the gas after the outburst dangers of the coal and the gas in the upper coal seam (4), the middle coal seam (5) and the lower coal seam (6) are eliminated.
After the outburst danger of coal and gas is eliminated, the mining sequence of the upper coal seam (4), the middle coal seam (5) and the lower coal seam (6) in the coal seam group is not separated in sequence, which coal seam eliminates the outburst danger of coal and gas firstly can mine the coal seam, and the normal extraction of directional drilling holes of other coal seams is not influenced. Meanwhile, during the extraction of a certain coal seam, the pressure relief gas released due to the extraction influence can be extracted by utilizing directional drilling holes in other unexplored coal seams. As shown in fig. 5, if the risk of coal and gas outburst is eliminated in the upper coal seam (4), the upper coal seam (4) is mined first, and the pressure relief gas released due to mining influence can be extracted by utilizing the directional drilling holes (2) in the middle coal seam and the directional drilling holes (3) in the lower coal seam; as shown in fig. 6, if the coal and gas outburst danger of the middle coal seam (5) is eliminated firstly, the middle coal seam (5) is mined firstly, and the pressure relief gas released due to mining influence can be mined by utilizing the upper coal seam directional borehole (1) and the lower coal seam directional borehole (3); as shown in FIG. 7, if the lower coal seam (6) eliminates the coal and gas outburst danger firstly, the lower coal seam (6) is mined firstly, and the pressure relief gas released due to mining influence can be mined by utilizing the upper coal seam directional drilling hole (1) and the middle coal seam directional drilling hole (2).
Claims (2)
1. A method for extracting gas of a coal seam group by directional drilling bedding is characterized by comprising the following steps: respectively constructing directional drilling holes in each coal seam of the deep coal seam group at a certain angle in the ground or a roadway by using a directional drilling machine, changing the drilling direction of the directional drilling machine after the depth of the coal seam is reached, so that a drill bit drills into the coal seam at an angle parallel to the coal seam, and the distance of the directional drilling holes entering the coal seam is determined by a pre-designed mining range; then, respectively extracting gas in each coal seam of the coal seam group by using the directional drilling holes, and extracting the coal seam after the coal and gas outburst danger of the coal seam is eliminated; after the danger of coal and gas outburst is eliminated, the mining sequence of each coal bed in the coal bed group is not divided; during the extraction period of a certain coal seam, the pressure relief gas released due to the extraction influence can be extracted by utilizing directional drilling holes in other unexplored coal seams.
2. The method for extracting the gas of the coal seam group by using the directional drilling bedding manner, which is characterized by comprising the following steps: the coal seam is more than or equal to two layers, and gas control is implemented in the coal seam group of the more than or equal to two layers of coal seams.
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| CN201810080230.1A CN108343400B (en) | 2018-01-27 | 2018-01-27 | Method for extracting coal seam group gas by directional drilling bedding |
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| CN201810080230.1A CN108343400B (en) | 2018-01-27 | 2018-01-27 | Method for extracting coal seam group gas by directional drilling bedding |
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| CN109162704A (en) * | 2018-10-16 | 2019-01-08 | 中国矿业大学(北京) | The pre- attenuating drilling negative pressure attenuation test device of a kind of coal-bed gas |
| CN109209477A (en) * | 2018-10-31 | 2019-01-15 | 淮南矿业(集团)有限责任公司 | A kind of method that concordant directional long borehole eliminates two regional coal-seam outburst dangers |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102383830A (en) * | 2011-09-30 | 2012-03-21 | 中煤科工集团重庆研究院 | Comprehensive outburst prevention method for outburst coal seam region |
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| CN101173604B (en) * | 2007-11-16 | 2011-11-30 | 中国科学院武汉岩土力学研究所 | Method for horizontal well mixed gas displacing coal-bed gas |
| CN103758560B (en) * | 2014-01-14 | 2015-11-18 | 中国矿业大学 | A kind of multiple topping packet zone mash gas harnessing method that goes forward one by one |
| CN104832176B (en) * | 2015-03-18 | 2016-10-12 | 西安科技大学 | A kind of multiplex method for arranging in lane of low air permeability coal seam group's pressure relief gas pumping mining suction road |
| CN105804788A (en) * | 2016-05-16 | 2016-07-27 | 中国矿业大学 | Method for managing coalbed gas roadway |
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| CN102383830A (en) * | 2011-09-30 | 2012-03-21 | 中煤科工集团重庆研究院 | Comprehensive outburst prevention method for outburst coal seam region |
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