CN111827958A - Method for treating coal face gas of ground well in tree-shaped mining area - Google Patents
Method for treating coal face gas of ground well in tree-shaped mining area Download PDFInfo
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- CN111827958A CN111827958A CN202010732394.5A CN202010732394A CN111827958A CN 111827958 A CN111827958 A CN 111827958A CN 202010732394 A CN202010732394 A CN 202010732394A CN 111827958 A CN111827958 A CN 111827958A
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- horizontal well
- tree
- coal face
- well section
- mining
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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
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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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 belongs to the field of coal mine gas extraction, and relates to a method for treating coal face gas by a tree-shaped mining area ground well, which is characterized in that a straight well section and an arc-shaped section are provided with a sleeve and a well cementation, 1 main horizontal well section is drilled from different positions (near a rake point A) of the horizontal well section, the main horizontal well section is arranged at the upper part of a stope overburden fracture zone, and more than 2 branch horizontal well sections covering the whole coal face are led out downwards from the main horizontal well section. The method has the advantages that gas released by the adjacent coal seam and the mined coal seam is extracted through the tree-shaped ground well under the mining pressure relief condition, the situation that the gas concentration of the coal face is out of limit due to the fact that a large amount of gas released by the mined coal seam and the adjacent thin coal seam is gathered on the coal face under the mining pressure relief condition and cannot be discharged timely is effectively prevented, coal safety production is affected, the gas safety of the coal face and the gas safety of a mining stable area can be guaranteed, and the coal mining working efficiency is improved.
Description
Technical Field
The invention belongs to the field of coal mine gas extraction, and relates to a method for treating coal face gas of a ground well in a tree-shaped mining area.
Background
In coal-series strata, a plurality of thin coal seams (generally without mining economy) exist near a mining coal seam, but a large amount of gas can be released in the thin coal seams under the mining pressure relief condition, most of the gas can flow into a coal face of the mining coal seam, and the gas concentration of the coal face is caused to be over-limit. Gas gushed out by pressure relief of the coal body of the coal seam can not be extracted in time and can be gathered on the coal face, thereby influencing coal mining production. Meanwhile, the gas in the mining stable area influences the production of the adjacent working faces, and the gas in the mining stable area needs to be extracted for gathering, transportation and utilization, so that the purpose of changing waste into treasure is achieved.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for treating coal face gas in a ground well in a tree-shaped mining area, which effectively ensures the safety of the coal face gas and the safety of the mining stable area gas.
In order to achieve the purpose, the invention provides the following technical scheme: a method for treating coal face gas of ground wells in a tree-shaped mining area comprises the following steps:
s1: arranging tree-shaped mining area ground well positions at the ground position outside the stoping line;
s2: constructing a tree-shaped mining area ground well through the ground well position to finish a straight well section, an arc section and a main horizontal well section L1Main horizontal well section L1The arrangement layer is arranged at the upper part of the fractured zone;
s3: in the main horizontal well section L1Lower part (position of lower part of fractured zone) is separated from main horizontal well section L1More than 2 branch horizontal well sections are arranged at different distances;
s4: arranging an extraction device on a ground well in the tree-shaped mining area, and leading a main horizontal well section and each branch horizontal well section to start negative pressure extraction of gas subjected to mining pressure relief along with the advancing of a coal face;
s5: and when the coal face extraction is finished, the main horizontal well section cooperates with each branch horizontal well section to continuously extract and extract the gas in the extraction stable area.
Optionally, the tree-like pay zone surface well is disposed at 1/2L, which is the middle of the coal face length L.
Optionally, the straight well section and the arc well section are both located outside the stoping line.
Optionally, a main horizontal well section L1The rock stratum is arranged at the upper part of the fractured zone, has the compressive strength of more than 40MPa and the thickness of more than 2 m.
Optionally, a main horizontal well section L1Constructing the coal face obliquely downwards, wherein the inclination angle is 3-5 degrees.
Optionally, a main horizontal well section L1And installing an extraction sieve tube in the whole well, wherein the inner diameter of the sieve tube is more than 200mm, and the wall thickness is more than 13 mm.
Optionally, the branch horizontal well section is arranged at a position 4-5 times the mining height of a coal seam at the lower part of the fractured zone, and is preferentially arranged in medium sandstone with the thickness of more than 2 m.
Optionally, the number of the branch horizontal well sections is determined according to the length L of the coal face, and the height difference of each branch horizontal well section is less than 2 m.
Optionally, the branch horizontal well section is provided with a sieve tube, the inner diameter of the sieve tube is larger than 150mm, and the wall thickness is larger than 10 mm.
Optionally, the extraction capacity of the extraction device is higher than 50m3/min。
The invention has the beneficial effects that: the method for treating the gas on the coal face of the ground well in the tree-shaped mining area can effectively prevent the situation that the gas concentration on the coal face is over-limited due to the fact that a large amount of gas released by a mined coal bed and an adjacent thin coal bed is gathered on the coal face under the mining pressure relief condition because the gas cannot be timely discharged, coal safety production is influenced, the gas safety of the coal face and the gas safety of a mining stable area can be guaranteed, and the coal mining working efficiency is improved.
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 may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is an overall cross-sectional view of a method of managing coal face gas in a ground well in a tree-like mining area according to the present invention;
FIG. 2 is a plan view of a method of the present invention for treating coal face gas with a surface well in a tree-like mining area.
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 terms such as "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 an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, 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 may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 2, a method for treating coal face gas of a ground well in a tree-shaped mining area includes the following steps:
s1: arranging tree-shaped mining area ground well positions at the ground position outside the stoping line;
s2: constructing a tree-shaped mining area ground well through the ground well position to finish a straight well section, an arc section and a main horizontal well section L1The ground well of the tree-shaped mining area is arranged in the middle of the length L of the coal face, namely 1/2L, and the main horizontal well section L1The arrangement layer is arranged at the upper part of the fractured zone, the straight well section and the arc well section are both positioned outside the stoping line, namely the tail end of the arc well section is required to be positioned at the left side of the stoping line, so that the structural safety of the ground well is ensured;
main horizontal well section L1Arranged at the upper part of the fractured zone (not exceeding the bending subsidence zone), has the compressive strength of more than 40MPa and the thickness of 2mIn the above rock formation, the main horizontal well section L1Constructing obliquely downwards towards the direction of a coal face, wherein the inclination angle is 3-5 degrees, and a main horizontal well section L1And installing an extraction sieve tube in the whole well, wherein the inner diameter of the sieve tube is more than 200mm, and the wall thickness is more than 13 mm.
S3: in the main horizontal well section L1To the main horizontal well section L (near the rake point a)1The lower part is provided with more than 2 branch horizontal well sections with the layers at the lower part of the fissure zone, the number of drilling is determined according to the length L of the coal face, such as L<Arranging 2 branch horizontal well sections as 100 m; 3 branched horizontal well sections are arranged in a distance of 140-180 m, 4 branched horizontal well sections are arranged around a distance of 200-300 m, the branched horizontal well sections are arranged at the position of a coal seam 4-5 times the mining height at the lower part of a fractured zone and are preferentially arranged in medium sandstone with the thickness greater than 2m, the number of the branched horizontal well sections is determined according to the length L of a coal face, and the height difference of 1-2m is allowed for each branched horizontal well section;
in this example, 4 horizontal well sections, each L, are arranged2、L3、L4、L5Branch horizontal well section L5The distance e from the air inlet roadway is 25-30m, and the branch horizontal well section L4The distance a from the return airway is 30-40m, L3And L5Has a horizontal distance d of 55-65m, L3And L2Has a horizontal distance c of 45-55m, L4And L2The horizontal distance b is 35-45m, each branch horizontal well section is provided with a sieve tube, the inner diameter of the sieve tube is more than 150mm, and the wall thickness is more than 10 mm;
s4: arranging an extraction device in a ground well of a tree-shaped mining area, starting negative pressure extraction, advancing along with a coal face, extracting gas (including a main mining coal layer and an adjacent thin coal layer) subjected to mining pressure relief by the main horizontal well section and each branch horizontal well section, and solving the problem of gas concentration overrun of the coal face;
in the embodiment, the extraction capacity of the extraction device arranged on the ground well in the tree-shaped mining area is not lower than 50m3The extraction method comprises the following steps of (a) min, starting negative pressure extraction at the position, which is 20-40m away from the tail end of an L-shaped well, of a coal face, controlling negative pressure to perform extraction according to the extraction quantity, and controlling the negative pressure within 40 kPa;
s5: waiting coal cutterAfter the face recovery is finished, the main horizontal well section L1In coordination with each branch horizontal well section (L)2、L3、L4、L5) And continuously extracting and extracting gas in the mining stable area.
The invention can effectively prevent the condition that the gas concentration of the coal face is over-limit due to the fact that a large amount of gas released by the mined coal seam and the adjacent thin coal seam is gathered on the coal face under the mining pressure relief condition and cannot be discharged in time, thereby affecting the safety production of coal, ensuring the gas safety of the coal face and the gas safety of a mining stable area, and improving the coal mining working efficiency.
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 (10)
1. A method for treating coal face gas of ground wells in a tree-shaped mining area is characterized by comprising the following steps:
s1: arranging tree-shaped mining area ground well positions at the ground position outside the stoping line;
s2: constructing a tree-shaped mining area ground well through the ground well position to finish a straight well section, an arc section and a main horizontal well section L1Main horizontal well section L1The arrangement layer is arranged at the upper part of the fractured zone;
s3: in the main horizontal well section L1Lower fissure zone lower distance L from main horizontal well section1More than 2 branch horizontal well sections are arranged at different distances;
s4: arranging an extraction device on a ground well in the tree-shaped mining area, and leading a main horizontal well section and each branch horizontal well section to start negative pressure extraction of gas subjected to mining pressure relief along with the advancing of a coal face;
s5: and when the coal face extraction is finished, the main horizontal well section cooperates with each branch horizontal well section to continuously extract and extract the gas in the extraction stable area.
2. The method for treating coal face gas of ground wells in tree-like mining areas according to claim 1, wherein the method comprises the following steps: the tree-like mining area surface well is disposed at 1/2L, which is the middle of the coal face length L.
3. The method for treating coal face gas of ground wells in tree-like mining areas according to claim 1, wherein the method comprises the following steps: the straight well section and the arc well section are both positioned outside the production stopping line.
4. The method for treating coal face gas of ground wells in tree-like mining areas according to claim 1, wherein the method comprises the following steps: main horizontal well section L1The rock stratum is arranged at the upper part of the fractured zone, has the compressive strength of more than 40MPa and the thickness of more than 2 m.
5. The method for treating coal face gas of ground wells in tree-like mining areas according to claim 1, wherein the method comprises the following steps: main horizontal well section L1Constructing the coal face obliquely downwards, wherein the inclination angle is 3-5 degrees.
6. The method for treating coal face gas of ground wells in tree-like mining areas according to claim 1, wherein the method comprises the following steps: main horizontal well section L1And installing an extraction sieve tube in the whole well, wherein the inner diameter of the sieve tube is more than 200mm, and the wall thickness is more than 13 mm.
7. The method for treating coal face gas of ground wells in tree-like mining areas according to claim 1, wherein the method comprises the following steps: the branch horizontal well section is arranged at the position 4-5 times of the mining height of a coal bed at the lower part of the fractured zone and is preferentially arranged in medium sandstone with the thickness of more than 2 m.
8. The method for treating coal face gas of ground wells in tree-like mining areas according to claim 1, wherein the method comprises the following steps: and determining the number of the branch horizontal well sections according to the length L of the coal face, wherein the height difference of each branch horizontal well section is less than 2 m.
9. The method for treating coal face gas of ground wells in tree-like mining areas according to claim 1, wherein the method comprises the following steps: and arranging a sieve pipe on the branch horizontal well section, wherein the inner diameter of the sieve pipe is more than 150mm, and the wall thickness is more than 10 mm.
10. The method for treating coal face gas of ground wells in tree-like mining areas according to claim 1, wherein the method comprises the following steps: the extraction capacity of the extraction device is higher than 50m3/min。
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Cited By (2)
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| CN112963124A (en) * | 2021-02-23 | 2021-06-15 | 重庆万普隆能源技术有限公司 | Coal bed gas extraction method |
| CN115331532A (en) * | 2022-08-31 | 2022-11-11 | 四川省煤田地质工程勘察设计研究院 | Multi-coal-seam multi-horizontal three-dimensional development model for coal mine gas and coal rock gas |
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| CN115331532A (en) * | 2022-08-31 | 2022-11-11 | 四川省煤田地质工程勘察设计研究院 | Multi-coal-seam multi-horizontal three-dimensional development model for coal mine gas and coal rock gas |
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