CN111101998B - Method for intercepting gas extracted from directional long drill hole - Google Patents
Method for intercepting gas extracted from directional long drill hole Download PDFInfo
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- CN111101998B CN111101998B CN202010061653.6A CN202010061653A CN111101998B CN 111101998 B CN111101998 B CN 111101998B CN 202010061653 A CN202010061653 A CN 202010061653A CN 111101998 B CN111101998 B CN 111101998B
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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
- E21B43/006—Production of coal-bed methane
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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
Abstract
The invention belongs to the field of underground gas extraction of coal mines, and particularly relates to a method for extracting gas by intercepting directional long drill holes, which solves the problem that when a coal body covered by the directional long drill holes is subjected to coal roadway tunneling crossheading construction, and when the directional long drill holes are exposed on a tunneling working face, the gas in the directional long drill holes abnormally gushes out to cause gas overrun. The invention comprises the steps of coal seam outburst elimination: s1: directional long drilling construction; s2: pre-extraction; s3: evaluating and analyzing the coal body; after the coal body outburst elimination is finished, the following steps are implemented: s4: tunneling a coal roadway crossheading; s5: analyzing a junction area; s6: ordinary drilling of a roadway is constructed; s7: intercepting extraction; s8: and continuing the coal roadway crossheading. The invention avoids gas in the directional long drill hole from instantly rushing out to the coal roadway crossheading tunnel space due to the exposure of the directional long drill hole during the coal roadway crossheading tunneling, thereby causing gas ejection or gas disaster accidents; the invention can quickly improve the tunneling speed of the roadway and realize the purpose of extracting peripheral coal bodies continuously.
Description
Technical Field
The invention belongs to the field of underground gas extraction of coal mines, and particularly relates to a method for intercepting and directionally extracting gas from a long drill hole.
Background
In advance of outburst coal seam mining activities, regulations (regulations) for preventing coal and gas outburst require protective layer mining on outburst coal seams or outburst elimination of coal seam gas pre-extraction. When multiple coal seams or coal seam groups are mined, pre-extraction is carried out on the outburst coal seams by mining the protective layer, such as areas in south China and north China; however, when a single coal seam region without a mining protective layer is mined, such as the regions of Henan, Shanxi, Sichuan and the like, pre-pumping coal seam gas is generally adopted to perform outburst elimination measures on the outburst coal seam. In the pre-pumping coal seam gas outburst elimination measure, a directional drilling machine is adopted to construct directional long drill holes in the outburst elimination coal seam roadway to the adjacent pre-pumping coal seam, and pre-pumping is carried out on the next working face or a plurality of working faces, so that outburst elimination is carried out on the pre-pumping coal seam (the purpose of large-area outburst elimination is achieved).
When the directional long drill hole is constructed to eliminate the outburst of the pre-pumping coal seam, the length of the main hole reaches 600-800m, and after the main hole is constructed, branch holes are constructed on two sides of the main hole, so that the directional long drill hole can fully cover the pre-pumping coal body. After 3-5 years of continuous extraction of the long drill hole to be determined, evaluating the regional effect of the coal body, and digging a crossheading in the (outburst-eliminated) coal body (coal seam) after confirming that the outburst danger of the coal body is eliminated, thereby achieving the purposes of shielding and improving the coal roadway tunneling speed.
In the actual construction process, because the directional long drill hole is long in distance and multiple branches are used for fully-covering extraction of the pre-excavated coal body, the directional long drill hole (in the range of a roadway) of the coal body is often exposed during the forward tunneling, if the gas accumulation amount in the directional long drill hole is large, the gas on the forward tunneling surface is abnormally gushed when the directional long drill hole is exposed, and if the directional long drill hole is not properly processed, the gas is easily sprayed out or gas disaster accidents are easily caused.
Disclosure of Invention
The invention provides a method for intercepting gas extracted from a directional long drill hole, aiming at solving the problem that when the directional long drill hole is exposed on a tunneling working surface when coal roadway tunneling is carried out on a coal body covered by the directional long drill hole, the gas in the directional long drill hole is abnormally gushed out to cause gas overrun.
The invention is realized by adopting the following technical scheme: a method for intercepting extracted gas of a directional long drill hole comprises the following steps: s1: directional long drilling construction; firstly, constructing a main hole, constructing branch holes at two sides of the main hole after the construction of the main hole is finished, realizing the full coverage of the directional long drilling hole on the coal body of the pre-pumping coal seam, and outputting a directional long drilling track graph during construction; s2: pre-extraction; after the directional long drilling construction is completed, pre-extracting the gas of the coal bed through the directional long drilling; s3: evaluating and analyzing the coal body; after 3-5 years of continuous pre-extraction of the undetermined long drill hole, evaluating the regional effect of the coal body and determining whether the coal body eliminates the outburst danger; after the coal body outburst elimination is finished, the following steps are implemented:
s4: tunneling a coal roadway crossheading; performing coal roadway crossheading in the coal body after outburst elimination according to a coal roadway heading crossheading design track;
s5: analyzing a junction area; analyzing the directional long drilling track diagram and the coal roadway tunneling crossheading design track to find out a predicted intersection area;
s6: ordinary drilling of a roadway is constructed; stopping the operation of the coal roadway crossheading tunneling surface before the roadway is constructed to the intersection area, and constructing common drilling holes;
s7: intercepting extraction; intercepting and extracting gas accumulated in the directional long drill hole through a common drill hole;
s8: continuing the coal roadway crossheading; and after the gas stored in the directional long drill hole is extracted by the common drill hole, continuing the coal roadway crossheading tunneling.
Further, the ordinary drilling described in S6 is performed in a drill site; the drilling site is positioned on a roadway side of the coal roadway crossheading heading face close to one side of the directional long drill hole; and the drilling site is positioned 30m behind the coal roadway crossheading face, so that the construction of a heading machine and a drilling machine on a working face does not generate interference.
Further, in S6, the operation of the coal roadway crossheading face is stopped 10-20m before the intersection area.
Further, the general drilled hole in S6 is multiple, and the multiple general drilled holes fully cover the main hole and the branch hole of the directional long drilled hole.
Further, the normal drilling in S6 covers the outer edge contour lines of the main hole and the branch hole up to the directional long drilling.
Compared with the prior art, the invention has the beneficial effects that:
the invention avoids gas in the directional long drill hole from instantly rushing out to the coal roadway crossheading tunnel space due to the exposure of the directional long drill hole during the coal roadway crossheading tunneling, thereby causing gas ejection or gas disaster accidents; the invention can quickly improve the tunneling speed of the roadway and realize the purpose of extracting peripheral coal bodies continuously.
Drawings
FIG. 1 is a schematic view of a conventional drilling operation according to the present invention;
in the figure: 1-coal roadway crossheading face, 2-coal roadway crossheading, 3-common drilling, 4-coal body, 5-directional long drilling and 6-drilling site.
Detailed Description
The embodiments of the invention will be further explained with reference to the accompanying drawings:
referring to fig. 1, the invention provides a method for intercepting extracted gas from a directional long borehole, which comprises the following steps: s1: constructing a directional long drill hole 5; firstly, constructing a main hole, constructing branch holes at two sides of the main hole after the construction of the main hole is finished, realizing the full coverage of the directional long drill hole 5 on the coal body 4 of the pre-pumping coal seam, and outputting a track diagram of the directional long drill hole 5 during the construction; s2: pre-extraction; after the directional long drill hole 5 is constructed, pre-extracting the gas of the coal seam through the directional long drill hole 5; s3: evaluating and analyzing a coal body 4; after 3-5 years of continuous pre-extraction of the long drill hole 5 to be oriented, evaluating the regional effect of the coal body 4, and determining whether the coal body 4 eliminates the outburst danger; after the outburst elimination of the coal body 4 is finished, the following steps are carried out:
s4: tunneling a coal roadway gate 2; tunneling the coal roadway crossheading 2 in the coal body 4 subjected to outburst elimination according to the coal roadway tunneling crossheading design track;
s5: analyzing a junction area; analyzing the directional long drilling hole 5 track diagram and the coal roadway tunneling crossheading design track to find out a predicted intersection area;
s6: constructing a common drilling hole 3 of the roadway; stopping the operation of the coal roadway crossheading tunneling surface 1 before the roadway is constructed to the intersection area, and constructing a common drill hole 3;
s7: intercepting extraction; intercepting and extracting gas accumulated in the directional long drill hole 5 through the common drill hole 3;
s8: continuing tunneling the coal roadway gate way 2; and after the gas stored in the directional long drill hole 5 is extracted by the common drill hole 3, the coal roadway gate way 2 is continued to be tunneled.
The ordinary drilling 3 described in S6 is performed in the drill site 6; the drill site 6 is positioned on the roadway side of the coal roadway crossheading face 1 close to one side of the directional long drill hole 5; and the drill site 6 is positioned 30-50m behind the coal roadway crossheading face 1, so that the construction of a working face heading machine and a drilling machine can not be interfered with each other, and the gas accumulated in the pre-exposed directional long drill hole 5 can be intercepted and extracted in advance.
And S6, stopping the operation of the coal roadway crossheading face 1 10-20m before the intersection area.
The number of the common drill holes 3 in the S6 is multiple, the multiple common drill holes 3 are longitudinally arranged and fully cover the main holes and the branch holes of the directional long drill hole 5, and the common drill holes 3 cover the outer edge contour lines of the main holes and the branch holes of the directional long drill hole 5; the diameter of the ordinary bore hole 3 is 75-113 mm.
The directional long drill hole 5 track graph is formed by tracking and positioning the constructed directional long drill hole 5 through a track measuring system (MWD) matched with a directional drilling machine, returning a drill bit advancing track to a drilling machine main system through a pulse signal with fixed frequency and connecting points.
The design track of the coal roadway gate way 2 is that according to a mine excavation and replacement plan, a roadway to be excavated is designed in a coal body 4 which is not excavated, adopts outburst elimination measures and achieves pre-extraction standard, and the roadways are communicated to form a ventilation system.
And the analysis of the intersection area is to derive a directional long drill hole 5 track diagram of the directional drilling machine, correspondingly add the track diagram to a corresponding construction site of a mine excavation engineering plan, combine the track diagram with a planned coal roadway crossheading 2 engineering and find out a predicted intersection area of the directional long drill hole 3 and the coal roadway crossheading 2.
Intercepting and extracting by common drilling: after the construction of the common drill hole is finished, before the common drill hole is not connected with a pumping system, the conditions of water return, negative pressure in the hole and the like of the common drill hole are observed, and if the common drill hole does not return water and the negative pressure exists in the hole, the conditions prove that the common drill hole can effectively relieve and intercept the directional long drill hole. And then, the common drill hole is connected into a drainage system, the gas concentration in the crossheading roadway is reduced to be below 0.2%, and the observed extraction quantity of the directional long drill hole is attenuated to 0m 3/min, so that the interception and extraction of the common drill hole are realized.
The invention avoids gas in the directional long drill hole from instantly rushing out to the coal roadway crossheading tunnel space due to the exposure of the directional long drill hole during the coal roadway crossheading tunneling, thereby causing gas ejection or gas disaster accidents; the invention can quickly improve the tunneling speed of the roadway and realize the purpose of extracting peripheral coal bodies continuously.
Claims (5)
1. A method for intercepting extracted gas of a directional long drill hole comprises the following steps: s1: constructing directional long drill holes (5); firstly, constructing a main hole, constructing branch holes at two sides of the main hole after the construction of the main hole is finished, realizing the full coverage of the directional long drill hole (5) on the coal body (4) of the pre-pumping coal seam, and outputting a track diagram of the directional long drill hole (5) during construction; s2: pre-extraction; after the directional long drill hole (5) is constructed, pre-extracting the gas of the coal seam through the directional long drill hole (5); s3: evaluating and analyzing a coal body (4); after 3-5 years of continuous pre-extraction of the undetermined long drill hole (5), evaluating the area effect of the coal body (4) and confirming whether the coal body (4) eliminates the outburst danger; the method is characterized in that: after the outburst elimination of the coal body (4) is finished, the following steps are implemented:
s4: tunneling a coal roadway gate way (2); tunneling the coal roadway crossheading (2) in the coal body (4) after outburst elimination according to the design track of the coal roadway tunneling crossheading;
s5: analyzing a junction area; analyzing a track diagram of the directional long drilling hole (5) and a designed track of a coal roadway tunneling crossheading to find out a predicted intersection area;
s6: constructing a common drilling hole (3) of the roadway; stopping the operation of the coal roadway crossheading tunneling surface (1) before the roadway construction reaches the intersection area, and constructing a common drilling hole (3);
s7: intercepting extraction; intercepting and extracting gas accumulated in the directional long drill hole (5) through a common drill hole (3);
s8: continuing tunneling the coal roadway gate way (2); and after the gas stored in the directional long drill hole (5) is extracted by the common drill hole (3), continuing tunneling the coal roadway gate way (2).
2. The method for extracting gas by intercepting directional long drill hole according to claim 1, characterized by comprising the following steps: the ordinary drilling (3) described in S6 is carried out in a drill site (6); the drill site (6) is positioned on the roadway side of the coal roadway crossheading face (1) close to one side of the directional long drill hole (5); and the drill site (6) is positioned 30m behind the coal roadway gate-way tunneling surface (1), so that the construction of a working surface tunneling machine and a drilling machine is not interfered.
3. The method for extracting gas by intercepting directional long drill hole according to claim 2, characterized by comprising the following steps: and S6, stopping the operation of the coal roadway crossheading face (1) 10-20m before the intersection area.
4. The method for extracting gas by intercepting directional long drill hole according to claim 3, characterized by comprising the following steps: the general drill holes (3) in the S6 are multiple, and the main holes and the branch holes of the directional long drill holes (5) are fully covered by the multiple general drill holes (3).
5. The method for extracting gas by intercepting directional long drill hole according to claim 4, characterized by comprising the following steps: the normal bore (3) in S6 covers the outer edge contour lines of the main hole and the branch hole to the directional long bore (5).
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| CN202010061653.6A CN111101998B (en) | 2020-01-19 | 2020-01-19 | Method for intercepting gas extracted from directional long drill hole |
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| CN202010061653.6A CN111101998B (en) | 2020-01-19 | 2020-01-19 | Method for intercepting gas extracted from directional long drill hole |
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| CN111101998B true CN111101998B (en) | 2021-03-19 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112443351A (en) * | 2020-11-20 | 2021-03-05 | 贵州盘江精煤股份有限公司 | Precise outburst elimination method for cross-section coal uncovering of rock cross |
| CN112412528A (en) * | 2020-11-20 | 2021-02-26 | 贵州盘江精煤股份有限公司 | Regional outburst elimination method for cross-section rock cross section of close-range coal seam group |
| CN113027510A (en) * | 2021-03-26 | 2021-06-25 | 安徽理工大学 | Method for extracting pressure-relief gas by blasting permeability-increasing directional long drill hole of thick and hard roof rock layer |
| CN114352344B (en) * | 2021-12-17 | 2023-09-26 | 中煤科工集团沈阳研究院有限公司 | Gas control method for coal seam tunnel passing through geological structure influence area |
| CN116556966B (en) * | 2023-07-07 | 2023-09-19 | 山西凯嘉能源集团有限公司 | Roadway driving method for precisely eliminating coal roadway driving coal and gas outburst |
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2020
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