CN112963133B - Method for extracting gas by directional drilling and hydraulic permeability increasing of coal body in middle of ultra-long working face - Google Patents
Method for extracting gas by directional drilling and hydraulic permeability increasing of coal body in middle of ultra-long working face Download PDFInfo
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- CN112963133B CN112963133B CN202110278502.0A CN202110278502A CN112963133B CN 112963133 B CN112963133 B CN 112963133B CN 202110278502 A CN202110278502 A CN 202110278502A CN 112963133 B CN112963133 B CN 112963133B
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
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- 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
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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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Abstract
The invention belongs to the technical field of coal mining. Relates to a method for extracting gas by directional drilling and hydraulic permeability increase of a coal body in the middle of an ultra-long working face, which comprises the following steps: s1, directional long drilling, S2, hydraulic slotting and permeability increasing, S3 and gas extraction. According to the invention, by combining the directional long drilling and hydraulic slotting processes, the hydraulic slotting permeability increase of the coal body in the middle of the ultra-long working face is performed, the air permeability of the coal body in the middle of the ultra-long working face is improved, the permeability increase of the coal layer of the working face is fully covered, the gas of the coal layer of the working face is efficiently pre-pumped, the standard time of the gas pre-pumping of the coal layer of the working face is shortened, the possibility of gas disasters of the ultra-long working face is reduced, and the safety, the high efficiency and the high yield of the ultra-long working face are realized.
Description
Technical Field
The invention belongs to the technical field of coal mining, and relates to a method for extracting gas by directional drilling and hydraulic permeability increase of a coal body with an ultra-long working face.
Background
In order to further improve the economic benefit and promote the construction of high-yield and high-efficiency mines, the increase of the length of the stope face of the coal mine is a basic mode for improving the single yield of the stope face. At present, the length of a stope face in China is generally 150-220 m, if the mining technical conditions permit, the length can reach 250-300 m, the face with the length of more than 300m is called an ultra-long face, the gas emission amount of the face is larger than that of a common face, and higher requirements are provided for stope technology, gas extraction and air supply.
At present, the length of a stope face of a plurality of intensive efficient super-huge type modern coal mines is generally more than 300m, and the stope face is a typical super-long working face. On one hand, however, the coal quality of the mined coal seam is soft, and the construction length of bedding drilling is limited; on the other hand, because the coal seam has poor air permeability, the coal seam gas can be effectively extracted only by adopting permeability-increasing measures, but the depth of influence of the currently applied mature hydraulic permeability-increasing measures is limited; the effective pre-pumping of the coal gas in the middle of the current overlong working face is a great problem for controlling the gas of the stope face.
Disclosure of Invention
In view of the above, the invention aims to solve the problems of poor air permeability of the coal body in the middle of the ultra-long working face and difficulty in gas extraction, and provides a method for extracting gas by directional drilling and hydraulic permeability increasing of the coal body in the middle of the ultra-long working face by combining the condition that a bottom suction roadway and a high suction roadway are generally arranged on the existing ultra-long stope working face of a large-scale high-gas mine.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for extracting gas by directional drilling and hydraulic permeability increase of coal in the middle of an ultra-long working face comprises the following steps:
s1, directional long drilling: two sides of the coal seam working surface are respectively provided with a high pumping roadway and a bottom pumping roadway; directionally drilling holes in the coal seam, the top plate and the bottom plate thereof from the bottom suction lane to the high suction lane, drilling a set distance at the middle coal body of the coal seam along the direction of the working surface, and then adjusting the drilling direction to ensure that the bottom suction lane and the high suction lane are communicated through the drilled holes;
s2, hydraulic slotting and permeability increasing: mounting hydraulic slotting permeability-increasing equipment at the middle coal body through a drilling hole in S1, performing slotting operation on the middle coal body by adopting a hydraulic slotting process, and processing generated coal slag;
s3, gas extraction: and arranging extraction pipes in the bottom pumping roadway and the high pumping roadway, wherein the extraction pipes are butted with the drill hole, and the gas escaping from the drill hole is extracted.
According to the method, the existing high-pumping roadway and bottom-pumping roadway are utilized, the directional drilling machine is adopted to realize the ultra-long-distance directional drilling, the water conservancy slotting permeability-increasing equipment is conveyed to the coal body in the middle of the coal seam which is difficult to act through the drilling, the middle coal body is subjected to subsection water conservancy slotting, and the hydraulic permeability increasing of the middle coal body of the ultra-long working face is realized.
Further, in step S2, the hydraulic slotting permeability-increasing equipment is installed in such a manner that the hydraulic slotting permeability-increasing equipment is brought to the middle coal body through the drill holes by using a drawing force during directional drilling and withdrawal, which has the following beneficial effects: the hydraulic slotting permeability-increasing equipment is pulled to the middle coal body by means of the drawing force when the directional drilling retreats, and no additional conveying device is needed.
Further, in step S2, the hydraulic seam cutting and permeability increasing equipment includes a self-rotation seam cutting device, a setting device, and a high-pressure water pipe; the high-pressure water pipe is connected with the self-rotating seam cutting device, and the setting seal is arranged between the drill hole and the high-pressure water pipe and communicated with the high-pressure water pipe; the self-rotating seam cutting device and the setting device are both driven by high-pressure water in the high-pressure water pipe.
Further, in step S2, the hydraulic slitting process includes the steps of:
A. starting setting by using high-pressure water to fix the self-rotating slot cutting device in the drill hole and prevent water from flowing back from the drill hole, then increasing the water pressure to open a valve of the self-rotating slot cutting device, starting the self-rotating slot cutting device to rotate and jet high-pressure water flow to start slot cutting on the middle coal body;
B. and (4) after the slotting is finished, reducing the water pressure to close the setting seal, moving the high-pressure water pipe forward along the drill hole by the depth of 1 slotting interval, repeating the step A, and performing slotting operation again until the slotting on the middle coal body is finished.
Further, in the step S2, the coal cinder is flushed by high-pressure water and discharged from the drilling hole in the bottom suction roadway; and arranging a slag discharge pipe and a vibrating screen at the hole of the drill hole of the bottom suction roadway, so that the coal slag in the drill hole is conveyed to the vibrating screen through the slag discharge pipe, the coal water is separated, and then the dry coal slag is conveyed out.
Further, in the step S1, the drilling distance of the directional drilling hole in the middle coal body is 100-200 m.
Further, the length of the overlong working face is 300-450 m.
The invention has the beneficial effects that: by combining the directional long drilling and hydraulic slotting processes, the hydraulic slotting permeability increase is performed on the middle coal body of the ultra-long working face, the air permeability of the middle coal body of the ultra-long working face is improved, the permeability increase full coverage of the coal layer of the working face and the high-efficiency pre-pumping of the gas of the coal layer of the working face are realized, the pre-pumping time of the gas of the coal layer of the working face is shortened, the possibility of gas disasters of the ultra-long working face is reduced, and the safety, the high efficiency and the high yield of the ultra-long working face are realized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof.
Drawings
For a better understanding of the objects, aspects and advantages of the present invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram illustrating overall effects of an embodiment of the present invention;
FIG. 2 is a schematic view of the directional drilling process of FIG. 1;
FIG. 3 is a schematic diagram of a water conservancy slot permeability increasing process of the present invention;
fig. 4 is a partially enlarged view of a portion a in fig. 3.
Reference numerals are as follows: 1-bottom suction lane; 2-high suction lane; 3-coal bed; 4, drilling; 5-slotting the coal body; 6-self-rotation slotting device; 7-high pressure water pipe; 8-setting; 9-vibrating screen; 31-middle coal body.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and the specific meaning of the terms described above will be understood by those skilled in the art according to the specific circumstances.
Example 1
Referring to fig. 1 to 4, a method for extracting gas by directional drilling and hydraulic permeability increase of coal body in the middle of an ultra-long working face includes the following steps:
s1, directional long drilling: the length of the working surface of the coal seam 3 is 300m, the thickness of the coal seam 3 is 5m, and a high pumping roadway 2 and a bottom pumping roadway 1 are respectively arranged on two sides of the working surface of the coal seam 3; directionally drilling a hole in the coal seam 3 from the bottom suction lane 1 to the direction of the high suction lane 2, drilling 100m in the middle coal body 31 of the coal seam 3 along the trend direction of a working surface, and then adjusting the drilling direction to ensure that the bottom suction lane 1 is communicated with the high suction lane 2 through the drilling hole 4;
s2, hydraulic slotting and permeability increasing: by utilizing the drawing force generated when the directional drilling retreats, hydraulic slotting and permeability-increasing equipment is brought to the middle coal body 31 through the drilling holes 4, and slotting operation is performed on the middle coal body 31 by adopting a hydraulic slotting process; wherein the hydraulic seam cutting and permeability increasing equipment comprises a self-rotation seam cutting device 6, a setting device 8 and a high-pressure water pipe 7; the self-rotating seam cutting device 6 is arranged at the port of the high-pressure water pipe 7, and the setting seal 8 is sleeved on the high-pressure water pipe 7 and communicated with the high-pressure water pipe 7.
The hydraulic slotting process comprises the following steps:
A. starting the setting 8 by using high-pressure water to fix the self-rotating slot cutting device 6 in the drill hole 4 and prevent water from flowing back from the drill hole 4, then increasing the water pressure to open a valve of the self-rotating slot cutting device 6, starting the rotation of the self-rotating slot cutting device 6 and jetting high-pressure water flow to start slot cutting on the middle coal body 31, and obtaining a coal body slot 5;
B. after slotting is finished, reducing the water pressure to close the setting seal 8, moving the high-pressure water pipe 7 forwards for 5m along the drill hole 4, repeating the step A, and performing slotting operation again until slotting on the middle coal body 31 is finished; wherein, the coal cinder is discharged to the bottom suction roadway 1 from the orifice of the drill hole 4 by the scouring of high-pressure water; the bottom suction roadway 1 is provided with a slag discharge pipe and a vibrating screen 9, the slag discharge pipe is in butt joint with an orifice, so that the coal slag is conveyed to the vibrating screen 9 through the slag discharge pipe for coal-water separation, and then the dry coal slag is conveyed out.
S3, gas extraction: and (3) installing extraction pipes in the bottom suction lane 1 and the high suction lane 2, butting the extraction pipes with the drill hole 4, and extracting the gas escaping from the hole opening.
Example 2
Referring to fig. 1 to 4, a method for extracting gas by directional drilling and hydraulic permeability increase of coal body in the middle of an ultra-long working face includes the following steps:
s1, directional long drilling: the length of the working surface of the coal seam 3 is 450m, the thickness of the coal seam 3 is 5m, and a high pumping roadway 2 and a bottom pumping roadway 1 are respectively arranged on two sides of the working surface of the coal seam 3; directionally drilling a hole in the coal seam 3 from the bottom suction lane 1 to the high suction lane 2, drilling for 200m at the middle coal body 31 of the coal seam 3 along the direction of the working surface, and then adjusting the drilling direction to ensure that the bottom suction lane 1 is communicated with the high suction lane 2 through the drill hole 4;
s2, hydraulic slotting and permeability increasing: by utilizing the drawing force generated when the directional drilling retreats, hydraulic slotting and permeability-increasing equipment is brought to the middle coal body 31 through the drilling holes 4, and slotting operation is performed on the middle coal body 31 by adopting a hydraulic slotting process; wherein the hydraulic slotting permeability-increasing equipment comprises a self-rotation slotting device 6, a setting device 8 and a high-pressure water pipe 7; the self-rotating slotting device 6 is arranged at the port of the high-pressure water pipe 7, and the setting device 8 is sleeved on the high-pressure water pipe 7 and communicated with the high-pressure water pipe 7.
The hydraulic slotting process comprises the following steps:
A. starting the setting seal 8 by using high-pressure water, fixing the self-rotation slotting device 6 in the drill hole 4, preventing water from flowing back from the drill hole 4, increasing the water pressure, opening a valve of the self-rotation slotting device 6, starting the self-rotation slotting device 6 to rotate and jet high-pressure water flow, and starting slotting the middle coal body 31 to obtain a coal body slotting 5;
B. after slotting is finished, reducing the water pressure to close the setting seal 8, moving the high-pressure water pipe 7 forwards for 5m along the drill hole 4, repeating the step A, and performing slotting operation again until slotting on the middle coal body 31 is finished; wherein, the coal cinder is discharged to the bottom suction roadway 1 from the orifice of the drill hole 4 by the scouring of high-pressure water; the bottom suction roadway 1 is provided with a slag discharge pipe and a vibrating screen 9, the slag discharge pipe is in butt joint with an orifice, so that the coal slag is conveyed to the vibrating screen 9 through the slag discharge pipe for coal-water separation, and then the dry coal slag is conveyed out.
S3, gas extraction: and (4) installing extraction pipes in the bottom pumping lane 1 and the high pumping lane 2, butting the extraction pipes with the drill hole 4, and extracting the gas escaping from the hole opening.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. A method for extracting gas by directional drilling and hydraulic permeability increase of coal in the middle of an ultra-long working face is characterized by comprising the following steps: the length of the super-long working face is 300-450 m, and the method comprises the following steps:
s1, directional long drilling: two sides of the coal seam working surface are respectively provided with a high pumping roadway and a bottom pumping roadway; directionally drilling holes in the coal seam, the top plate and the bottom plate thereof from the bottom pumping lane to the high pumping lane, drilling a set distance at the middle coal body of the coal seam along the direction of the working surface, and then adjusting the drilling direction to ensure that the bottom pumping lane is communicated with the high pumping lane through the drilled holes;
s2, hydraulic slotting and permeability increasing: installing hydraulic slotting permeability-increasing equipment at the middle coal body through a drilling hole in S1, performing slotting operation on the middle coal body by adopting a hydraulic slotting process, and processing generated coal slag; the hydraulic slotting permeability-increasing equipment is installed in a mode that the hydraulic slotting permeability-increasing equipment is brought to the middle coal body through the drill holes by utilizing the drawing force generated when the directional drill holes retreat; the hydraulic seam cutting and permeability increasing equipment comprises a self-rotation seam cutting device, a setting device and a high-pressure water pipe; the high-pressure water pipe is connected with the self-rotating seam cutting device, and the setting seal is arranged between the drill hole and the high-pressure water pipe and communicated with the high-pressure water pipe; the self-rotating seam cutting device and the setting device are driven by high-pressure water in a high-pressure water pipe;
s3, gas extraction: and arranging extraction pipes in the bottom pumping roadway and the high pumping roadway, wherein the extraction pipes are butted with the drill hole, and the gas escaping from the drill hole is extracted.
2. The method for extracting gas by directional drilling and hydraulic permeability increasing of the coal body in the middle of the overlong working face according to claim 1, wherein the method comprises the following steps: in step S2, the hydraulic slitting process includes the steps of:
A. starting setting by using high-pressure water to fix the self-rotating slot cutting device in the drill hole and prevent water from flowing back from the drill hole, then increasing the water pressure to open a valve of the self-rotating slot cutting device, starting the self-rotating slot cutting device to rotate and jet high-pressure water flow to start slot cutting on the middle coal body;
B. and (4) after the slotting is finished, reducing the water pressure to close the setting seal, moving the high-pressure water pipe forward along the drill hole by the depth of 1 slotting interval, repeating the step A, and performing slotting operation again until the slotting on the middle coal body is finished.
3. The method for extracting gas by directional drilling and hydraulic permeability increasing of the coal body in the middle of the overlong working face according to claim 1, wherein the method comprises the following steps: in the step S2, the coal cinder is flushed by high-pressure water and discharged from the drilling hole in the bottom suction roadway; and a slag discharge pipe and a vibrating screen are arranged at the hole of the drilling hole of the bottom suction roadway, so that the coal slag in the drilling hole is conveyed to the vibrating screen through the slag discharge pipe, the coal-water separation is carried out, and then the dry coal slag is conveyed out.
4. The method for extracting gas by directional drilling and hydraulic permeability increasing of the coal body in the middle of the overlong working face according to claim 1, wherein the method comprises the following steps: and in the step S1, drilling distance of the directional drilling hole in the middle coal body is 100-200 m.
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| CN111764955A (en) * | 2020-07-21 | 2020-10-13 | 中煤科工集团重庆研究院有限公司 | Coal roadway advance region pre-extraction method based on directional extraction drilling cross-roadway arrangement |
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