CN109899106B - Gas extraction method for adjacent layer of turning long drill hole for avoiding caving zone - Google Patents
Gas extraction method for adjacent layer of turning long drill hole for avoiding caving zone Download PDFInfo
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Abstract
The invention discloses a method for extracting gas at a neighboring layer of a turning long drill hole for avoiding a caving zone, which comprises the steps of constructing a turning long drill hole surface at the side of a return air roadway, avoiding the caving zone according to the turning long drill hole surface, drilling in an unaffected rock stratum until reaching a fractured zone, drilling a certain distance in the fractured zone, drilling a long drainage drill hole into the fractured zone of a coal seam roof of a goaf along the edge of the caving zone, draining gas at the goaf and the neighboring layer through the fractured zone of the coal seam roof, actively avoiding the caving zone through an autonomous guide drill bit, adopting a common drill hole, subtracting a process flow link of a roof drainage roadway, saving more than 50 percent of manpower, material resources and financial resources, not only realizing the efficient extraction of the gas at the neighboring layer, but also effectively solving the problem of controlling the gas emission at a corner on a working face, and having good application prospect on the problem of the gas emission at the corner on a high-yield and high-efficiency working face, and an effective technical support is provided for the safe production of a high-yield and high-efficiency working face.
Description
Technical Field
The invention relates to the technical field of coal seam gas extraction, in particular to a method for extracting gas of a turning long drill hole adjacent layer for avoiding a caving zone.
Background
At present, when a coal seam group is mined, gas in other coal seams within a certain distance above and below the mined coal seam can flow into a working face space of the mined coal seam along cracks caused by pressure relief, in order to relieve the threat of the gas gushed from an adjacent layer to the mined coal seam, drilling needs to be carried out from the mined coal seam or a surrounding rock roadway to the adjacent coal seam, and the gas in the adjacent coal seam is pumped out so as to reduce the gas gushed from the adjacent layer to the mined layer due to mining influence.
The common adjacent layer gas extraction method comprises the steps of firstly drilling an independent gas drainage roadway, namely a top plate drainage roadway, drilling a hole into a fractured zone from the top plate drainage roadway, and draining the adjacent layer gas, wherein the representative drainage method is to perform gas drainage on the hole or the roadway arranged in an annular fractured ring, the independent top plate drainage roadway needs to be drilled, the hole is drilled through the top plate drainage roadway or the top plate drainage roadway to extract the gas on the top plate of a coal seam, or a pressure relief fracture with a bedding fracture is formed in the pressure relief coal seam, an upward grid type bedding-through drainage borehole is drilled from the bottom plate gas drainage roadway of the pressure relief coal seam to a pressure relief coal layer in the gas drainage roadway of the bottom plate of the pressure relief coal seam in advance, and the pressure relief gas is collected to the drainage borehole along the bedding fracture and can be drained through a drainage pipeline; meanwhile, the drainage drill hole is often influenced by a caving zone to collapse the hole, and measures such as casing pipe arrangement and the like are adopted to reinforce the drainage drill hole.
However, the above-mentioned gas drainage methods all need to drill an independent gas drainage roadway on the coal seam roof or the bottom plate, reinforce the drainage borehole, and add the above-mentioned process steps, and need a lot of expenses, consume a lot of manpower, material resources, and financial resources, so how to overcome the above-mentioned problems, a novel method for extracting gas from the coal seam adjacent layer is proposed, which needs to be solved at present.
Disclosure of Invention
The invention aims to solve the problems that the existing gas drainage method needs to drill an independent gas drainage roadway on the coal seam roof or the bottom plate, reinforce the drainage drill hole, increase the process links and need a large amount of expenditure. According to the method for extracting the gas in the adjacent layer of the turning long drill hole for avoiding the caving zone, the caving zone is actively avoided through the autonomous guide drill bit, the process flow link of a roof plate drawing and releasing roadway is omitted by adopting the common drill hole, the manpower, the material resources and the financial resources are saved, the high-efficiency extraction of the gas in the adjacent layer is realized, and the method has a good application prospect.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for extracting gas in a near layer of a turning long drill hole for avoiding an caving zone comprises the following steps,
step (A), constructing a turning long drilling surface in a return airway according to the edge of the caving zone, wherein the turning long drilling surface is arranged around the caving zone, and the distance between the turning long drilling surface and the caving zone is 5-15 m;
b, drilling a plurality of drainage drill holes into a coal seam roof fracture zone of the goaf along the edge of the caving zone at certain intervals on the side of the return airway of the turning long drill hole surface;
step (C), avoiding the area of the caving zone by selecting the position of the guide drill bit, and continuing drilling in the rock stratum after the drainage drill hole accurately bypasses the caving zone;
step (D), when the drill bit drills to the fractured zone, continuing to drill for a certain distance to the fractured zone;
step (E), sealing holes, namely repeating the step (C) to the step (D), and completing the sealing of the plurality of drainage drill holes in the step (B) until all drainage drill holes in the turning long drill holes in the caving zone are avoided;
step (F), connecting the drainage drilling holes with a main drainage pipeline through rubber pipes, and pre-pumping gas before the working face is not mined;
and (G) after the working face is mined, each drainage drill hole is communicated with a fracture zone of the coal seam roof, and gas in the goaf and the adjacent layer is drained through the corresponding fracture zone.
And (B) drilling 1-3 drainage drill holes into the coal seam roof fissure zone of the goaf along the edge of the caving zone in the return airway at intervals of 30-50 m.
And (B) drilling 1 drainage borehole into the coal seam roof fissure zone of the goaf at intervals of 30m in the return airway along the edge of the caving zone.
And (D) continuing drilling 120-200m into the fractured zone after the drill bit drills into the fractured zone.
And (D) when the drill bit drills to the fractured zone, continuing drilling for 150m into the fractured zone.
In the method for extracting the gas in the adjacent layer of the turning long drill hole for avoiding the caving zone, in the step (F), the armored rubber pipe is used for connecting each drainage drill hole with the drainage main pipeline.
The invention has the beneficial effects that: the method for extracting the gas at the adjacent layer of the turning long drill hole for avoiding the caving zone comprises the steps of constructing a turning long drill hole opening point (surface) at the side of a return air tunnel, avoiding the caving zone by utilizing (according to) a turning long drill hole track (surface), drilling in an unaffected rock stratum until reaching the fractured zone, drilling in the fractured zone (a certain distance), drilling a drainage drill hole in the fractured zone of the coal seam roof of a goaf along the edge of the caving zone, draining the goaf and the gas at the adjacent layer through the fractured zone of the coal seam roof, actively avoiding the caving zone through an autonomous guide drill bit, and reducing the rock roadway tunneling process link of the drainage roadway of a roof by adopting a drilling method (and adopting common drilling), so that more than 50 percent of manpower, material resources and financial resources can be saved, the efficient extraction of the gas at the adjacent layer is realized, and the problem of gas emission at the corner on a working face can be effectively solved, the method has good application prospect in the aspect of controlling the problem of gas emission from the upper corner of the high-yield and high-efficiency working face, and provides effective technical support for safe production of the high-yield and high-efficiency working face.
Drawings
FIG. 1 is a flow chart of a gas extraction method for a turning long borehole adjacent layer for avoiding an caving zone;
FIG. 2 is a schematic diagram of an embodiment of a curved long bore surface of the present invention;
fig. 3 is a schematic structural view of another embodiment of the turning long drilling surface of the present invention.
The designations in the drawings have the following meanings:
1: a falling belt; 2: drilling; 3: a fissure zone.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in FIG. 1, the method for extracting gas from the adjacent layer of the long turning borehole for avoiding the caving zone comprises the following steps,
and (A) constructing a turning long drilling surface in the return airway according to the edge of the caving zone, wherein the turning long drilling surface is arranged around the caving zone, and the turning long drilling surface is 5-15m away from the caving zone, as shown in figures 2 and 3. Two ways of turning a long drilling surface, wherein, 1: a falling belt; 2: drilling; 3: a fissure zone;
step (B), drilling a plurality of drainage drill holes into the goaf coal seam roof fracture zone along the edge of the caving zone at intervals of a certain distance on the side of the return airway of the turning long drill hole surface, drilling 1-3 drainage drill holes into the goaf coal seam roof fracture zone along the edge of the caving zone at intervals of 30-50m, preferably drilling 1 drainage drill hole into the goaf coal seam roof fracture zone along the edge of the caving zone at intervals of 30m, and ensuring the gas drainage efficiency by the number of the drainage drill holes in the mode;
step (C), avoiding a caving zone area by selecting the position of a guide drill bit, and continuously drilling in a rock stratum after a drainage drill hole bypasses the caving zone;
step (D), after the drill bit drills to the fractured zone, drilling to the fractured zone for a distance of 120-200m, wherein the distance is preferably 150 m;
step (E), sealing holes, namely repeating the step (C) to the step (D), and completing the sealing of the plurality of drainage drill holes in the step (B) until all drainage drill holes in the turning long drill holes in the caving zone are avoided;
step (F), connecting the drainage main pipeline with rubber pipes for each drainage drill hole, pre-pumping the gas before the working face is not mined, wherein the rubber pipes are armored rubber pipes and have low cost;
and (G) after the working face is mined, each drainage drill hole is communicated with a fracture zone of the coal seam roof, and gas in the goaf and the adjacent layer is drained through the corresponding fracture zone.
In conclusion, the method for extracting gas from the adjacent layer of the turning long drill hole for avoiding the caving zone comprises the steps of constructing a turning long drill hole opening point (surface) at the side of the return air tunnel, avoiding the caving zone by utilizing (according to) a turning long drill hole track (surface), drilling in an unaffected rock stratum until reaching the fractured zone, drilling (drilling for a certain distance) in the fractured zone, drilling a long drainage drill hole in the fractured zone of the coal seam roof of the goaf along the edge of the caving zone, draining the goaf and the gas in the adjacent layer through the fractured zone of the coal seam roof, actively avoiding the caving zone through an autonomous guide drill bit, saving more than 50 percent of manpower, material resources and financial resources due to the adoption of a drilling method (and the adoption of common drilling), subtracting a rock roadway tunneling process flow of the drainage roadway with a roof, realizing the efficient extraction of the gas in the adjacent layer, and effectively solving the problem of corner gas emission on a working face, the method has good application prospect in the aspect of controlling the problem of gas emission from the upper corner of the high-yield and high-efficiency working face, and provides effective technical support for safe production of the high-yield and high-efficiency working face. The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A method for extracting gas in a turning long drill hole adjacent layer for avoiding a caving zone is characterized by comprising the following steps of: comprises the following steps of (a) carrying out,
step (A), constructing a turning long drilling surface in a return airway according to the edge of the caving zone, wherein the turning long drilling surface is arranged around the caving zone, and the distance between the turning long drilling surface and the caving zone is 5-15 m;
step (B), drilling 1 drainage drill hole into a coal seam roof fracture zone of the goaf at intervals of 30m along the edge of the caving zone on the side of the return airway of the turning long drill hole surface;
step (C), avoiding the area of the caving zone by selecting the position of the guide drill bit, and continuing drilling in the rock stratum after the drainage drill hole accurately bypasses the caving zone;
step (D), after the drill bit drills to the fractured zone, drilling for 150m to the fractured zone continuously;
step (E), sealing holes, namely repeating the step (C) to the step (D), and completing the sealing of the plurality of drainage drill holes in the step (B) until all drainage drill holes in the turning long drill holes in the caving zone are avoided;
step (F), connecting the armored rubber pipes to the drainage main pipelines by using the drainage drill holes, and pre-pumping the gas before the working face is not mined;
and (G) after the working face is mined, each drainage drill hole is communicated with a fracture zone of the coal seam roof, and gas in the goaf and the adjacent layer is drained through the corresponding fracture zone.
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| CN100593630C (en) * | 2007-11-23 | 2010-03-10 | 煤炭科学研究总院抚顺分院 | Caving zone edge inclined drill hole bushing burying method for extracting and discharging gas for goaf and adjacent layer |
| CN102518464B (en) * | 2011-12-09 | 2014-06-18 | 中国神华能源股份有限公司 | Method for extracting gas at corner on recovery working face in coal mine |
| CN103016047B (en) * | 2012-12-20 | 2015-05-20 | 大同煤矿集团有限责任公司 | Method of draining gas in gob through long drill hole in roof trend on fully mechanized caving face |
| CN106285477B (en) * | 2016-08-30 | 2018-06-19 | 中煤科工集团西安研究院有限公司 | Underground coal mine adopt gas pumping top plate face upward wear layer orientation hole construction method |
| CN107740677A (en) * | 2017-09-22 | 2018-02-27 | 中煤科工集团西安研究院有限公司 | A kind of broken soft seam concordant directional long borehole gas pumping method for crossing working face |
| CN108894728A (en) * | 2018-07-27 | 2018-11-27 | 淮南矿业(集团)有限责任公司 | A kind of construction method of gas drainage directional long borehole group and directional long borehole |
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