CN111287787A - Method for efficiently pumping and discharging gas through top plate crack expansion - Google Patents
Method for efficiently pumping and discharging gas through top plate crack expansion Download PDFInfo
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- CN111287787A CN111287787A CN202010200291.4A CN202010200291A CN111287787A CN 111287787 A CN111287787 A CN 111287787A CN 202010200291 A CN202010200291 A CN 202010200291A CN 111287787 A CN111287787 A CN 111287787A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005086 pumping Methods 0.000 title claims abstract description 21
- 238000007599 discharging Methods 0.000 title claims abstract description 20
- 239000003245 coal Substances 0.000 claims abstract description 93
- 238000005553 drilling Methods 0.000 claims abstract description 29
- 238000010276 construction Methods 0.000 claims abstract description 10
- 238000005336 cracking Methods 0.000 claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 5
- 206010017076 Fracture Diseases 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000008262 pumice Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a method for efficiently pumping and discharging gas by top plate crack expansion, which relates to the technical field of coal mine gas control and comprises the following steps: arranging a drainage roadway for draining gas along the direction of the coal seam at a position with a distance H = 0-100 m from the normal line of the coal seam, arranging drainage hole drilling sites outside two sides of the drainage roadway, and constructing inclined drainage drill holes in the drainage drilling sites; step two: according to the coal seam roof fracturing method, the coal seam roof is fractured in the coal seam at the lower part of the drainage drill hole and in the range of 0-10 m of the contact part of the coal seam and the roof, and the pressure of coal seam gas is relieved. The invention solves the problem of efficiently pumping and discharging coal seam gas before coal seam excavation construction, can expand the pressure relief space of the coal seam gas pressure, improve the development degree of the top plate cracks of the coal face, is beneficial to the release of the coal seam gas, further improves the pumping and discharging efficiency of the coal seam face along the trend gas pumping and discharging roadway, and has the advantages of simple field application program, convenient operation, low cost and high success rate.
Description
Technical Field
The invention relates to the technical field of coal mine gas control, relates to drainage for coal mine underground coal seam gas, and particularly relates to a method for efficiently draining gas through top plate crack expansion.
Background
In the last decade, a great deal of research with great effect is carried out on coal seam gas drainage at home and abroad, particularly on the aspects of high drainage lane strike and drilling medium cracking gas pressure relief. The strike high-suction roadway is mainly used for drainage control of gas in a goaf during stoping of a working face, and the key parameter of the strike high-suction roadway is to arrange the strike high-suction roadway in a fracture zone of the coal face according to the distribution characteristic of three zones of the coal face so as to be capable of draining high-concentration gas. The pressure relief of the cracking gas of the drilling medium is mainly used for gas drainage of a roadway drilling hole during roadway excavation or working face stoping, and the key parameters of the pressure relief are the parameters of the cracking medium and the parameters of the drilling hole surrounding rock.
The various coal bed gas drainage technologies play a powerful technical support for ensuring the safe production of coal mines, but the various current drainage technologies also have different defects and limitations in production practice, and the two technologies are not combined to realize advantage complementation, so that the drainage effect cannot be improved revolutionarily all the time.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for efficiently pumping and discharging gas by expanding a roof, which has simple procedure, low cost and easy operation. According to the top plate fracturing method, before coal seam excavation disturbance, the gas drainage roadway is constructed along the trend of the coal seam top plate, the oblique fracture drilling holes are constructed at intervals along two axial sides of the gas drainage roadway, the pressure of coal seam gas is relieved, the development degree of coal seam top plate fractures is improved, the release of coal seam gas is promoted, and the efficient drainage of the coal seam gas is realized.
In order to achieve the purpose, the invention adopts the following technical scheme that the method for efficiently pumping and discharging the gas by the top plate expanding crack comprises the following steps:
the method comprises the following steps: arranging a drainage roadway for draining gas along the direction of the coal seam at a position with a distance H = 0-100 m from the normal line of the coal seam, arranging drainage hole drilling sites outside two sides of the drainage roadway, and constructing inclined drainage drill holes in the drainage drilling sites;
step two: according to the coal seam roof fracturing method, the coal seam roof is fractured in the coal seam at the lower part of the drainage drill hole and in the range of 0-10 m of the contact part of the coal seam and the roof, and the pressure of coal seam gas is relieved.
Wherein, step one includes the following steps:
the first step is as follows: moving to the position of a gas drainage roadway, wherein the roadway width B of the drainage roadway is = 3.0-5.0 m, and the height h of the drainage roadway is = 2.0-3.5 m;
the second step is that: after the construction of the gas drainage roadway along the trend of the coal seam is completed, arranging drainage hole drill sites outside the two sides of the high drainage roadway along the drainage hole drill sites, wherein the arrangement distance L = 2.0-80.0 m, the width b = 3.0-5.0 m and the length L = 0-5.0 m;
the third step: arranging drainage drill holes in the drainage drill hole fields outside the two sides of the drainage roadway along the coal seam trend, wherein the number of the drill holes is 1-10, the vertical distance between the inner side drill hole and the inner side of the drainage drill hole is 0.5-5.0 m, and the vertical distance between the outer side drill hole and the roadway side of the drainage roadway is 0.5 m;
the fourth step: constructing oblique drainage drill holes in the drainage drill hole site, wherein the diameter phi of the oblique drainage drill holes is = 60-150 mm, the included angle theta between the oblique drainage drill holes and the inclined coal seam layer is = 5-90 degrees, and the distance H between the construction drill holes of the oblique drainage drill holes and the normal of the coal seam is = 0-100 m.
And in the second step, the coal seam roof is fractured by adopting an explosion fracturing method, a carbon dioxide fracturing method, a hydraulic fracturing method and a high-energy pulse fracturing method.
According to the above content, the method for efficiently pumping and discharging the gas by top plate crack expansion has the beneficial effects that:
the invention solves the problem of efficiently pumping and discharging coal seam gas before coal seam excavation construction, can expand the pressure relief space of the coal seam gas pressure, improve the development degree of the top plate crack of the coal face, is beneficial to the release of the coal seam gas, further improves the pumping and discharging efficiency of the coal seam face along the trend of a gas pumping and discharging roadway, and has important significance for mine safety production and gas pumping and discharging; constructing gas drainage tunnels along the trend of the coal seam roof, constructing drainage drill holes at two sides of the coal seam roof at intervals along the gas drainage tunnels, fracturing the coal seam and the roof by adopting a fracturing method, relieving the pressure of the coal seam gas, promoting the release of the coal seam gas, and realizing the efficient drainage of the gas of the unexploded disturbed coal seam; the roof cracking can promote the gas analysis of the coal seam, improve the growth rate of the coal seam roof cracks, improve the gas drainage effect of the gas drainage roadway, and further provide reliable guarantee for the safety production of coal mine excavation; the method has the advantages of simple field application program, convenient operation, low cost and high success rate.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a vertical sectional view of the gas drainage roadway and the drainage hole drill site arranged along the strike direction;
FIG. 2 is a top plan view of the gas drainage roadway along the strike direction in accordance with the present invention.
Fig. 3 is a vertical cross-sectional view of an extraction hole drill site of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, and that the configuration and operation of the specific orientation, and therefore, should not be taken as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Examples
The method for efficiently pumping and discharging the gas for the top plate propagation as shown in fig. 1 to 3 comprises the following steps:
preparing before grouting, transporting drilling equipment, fracturing medium materials (explosive, water, carbon dioxide or other high-energy materials) and a vacuum sewage suction pump to a point needing to be measured, and then installing the equipment;
moving to the position of a gas drainage roadway: arranging a drainage roadway for draining gas along the trend of the coal seam at a position with a distance H = 0-100 m from the normal line of the coal seam, wherein the width B = 3.0-5.0 m of the drainage roadway and the height H = 2.0-3.5 m;
drawing a hole drilling field: after the construction of a coal seam gas drainage roadway along the trend is completed, arranging drainage hole drill sites along the two sides of a high drainage roadway, wherein the arrangement distance L = 2.0-80.0 m, the width b = 3.0-5.0 m and the length L = 0-5.0 m;
arranging drainage drill holes: constructing oblique drainage drill holes in drainage drill holes outside two sides of the drainage roadway along the coal seam direction, wherein the number of the drill holes is 1-10, the vertical distance between the inner side drill hole and the inner side of the drainage drill hole is 0.5-5.0 m, and the vertical distance between the outer side drill hole and the roadway side of the drainage roadway is 0.5 m;
and (4) drainage drilling: constructing oblique drainage drill holes in a drainage drill hole site, wherein the diameter phi of the oblique drainage drill holes is = 60-150 mm, the included angle theta between the oblique drainage drill holes and the inclined layer of the coal seam is = 5-90 degrees, and the distance H between the construction drill holes of the oblique drainage drill holes and the normal of the coal seam is = 0-100 m;
the coal seam roof fracturing method comprises the following steps: in the coal seam at the lower part of the drainage drill hole and in the range of 0-10 m of the contact part of the coal seam and the top plate, a blasting fracturing method, a carbon dioxide fracturing method, a hydraulic fracturing method and a high-energy pulse fracturing method can be selected;
also includes the preparation work: conveying materials and drilling equipment used for drilling the downward and oblique drill holes to a selected measuring point position according to requirements, and then drilling;
when drilling, the length of a dip fracturing drill hole from the normal line of a coal seam is 0-100 m, the included angle theta between the axis of the drill hole and the inclined layer of the coal seam is = 5-90 degrees, and after drilling is finished, a vacuum sewage suction pump is used for cleaning out pumice drill cuttings;
before the depression inclined drill hole is fractured, measuring physical and mechanical parameters of a top rock layer of the coal seam; by adopting a method of carrying out laboratory tests on rock samples and adopting a drilling instrument to carry out drilling tests, the occurrence, bedding and fracture development conditions of the rock layer of the coal seam roof are found out, the lithology and corresponding physical mechanical parameters of the roof of the working face are obtained, and scientific and reliable data are obtained for the subsequent fracturing through the geomechanical test of the surrounding rock of the working face;
after the bent and inclined drilling hole fracturing operation is finished, gas generated after the drilling hole fracturing operation is discharged through negative pressure ventilation;
specifically, when the soft fracturing coal body is subjected to gas measurement, three procedures of selection of a gas drainage roadway position along the trend, design of a top plate drainage hole drilling site and design of top plate drainage drilling parameters are carried out one by one in sequence and cannot be crossed; and (4) finishing the construction of drainage drilling, after the fracturing medium is filled, fracturing, and timely performing negative-pressure ventilation and drainage on gas released by the fracturing hole after fracturing work is finished.
The invention solves the problem of efficiently pumping and discharging coal seam gas before coal seam excavation construction, can expand the pressure relief space of the coal seam gas pressure, improve the development degree of the top plate crack of the coal face, is beneficial to the release of the coal seam gas, further improves the pumping and discharging efficiency of the coal seam face along the trend of a gas pumping and discharging roadway, and has important significance for mine safety production and gas pumping and discharging; the top plate depression and inclination drainage drilling hole cracking method comprises three procedures of selection of positions along the trend of a gas drainage roadway, design of a top plate drainage hole drilling field and design of top plate drainage drilling parameters, wherein the three procedures are sequentially carried out, so that the top plate cracking effect is ensured, and the gas drainage efficiency of the working face along the trend of the gas drainage roadway is improved; the top plate crack expanding method can expand the pressure relief range of the coal seam gas pressure, improve the development degree of the top plate cracks of the coal face, facilitate the release of the coal seam gas, further improve the drainage efficiency of the coal face along the trend of a gas drainage roadway, and provide guarantee for the safety production of the coal face; the top plate crack expanding method has the advantages of simple procedure, convenient operation, low cost and high success rate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A method for efficiently pumping and discharging gas during top plate crack propagation is characterized by comprising the following steps:
the method comprises the following steps: arranging a drainage roadway for draining gas along the direction of the coal seam at a position with a distance H = 0-100 m from the normal line of the coal seam, arranging drainage hole drilling sites outside two sides of the drainage roadway, and constructing inclined drainage drill holes in the drainage drilling sites;
step two: according to the coal seam roof fracturing method, the coal seam roof is fractured in the coal seam at the lower part of the drainage drill hole and in the range of 0-10 m of the contact part of the coal seam and the roof, the pressure of coal seam gas is relieved, and the coal seam gas is pre-pumped.
2. The method for efficiently pumping and releasing the gas through the top plate propagation of the claim 1, wherein the step one comprises the following steps:
the first step is as follows: moving to the position of a gas drainage roadway, wherein the roadway width B of the drainage roadway is = 3.0-5.0 m, and the height h of the drainage roadway is = 2.0-3.5 m;
the second step is that: after the construction of the gas drainage roadway along the trend of the coal seam is completed, arranging drainage hole drill sites outside the two sides of the high drainage roadway along the drainage hole drill sites, wherein the arrangement distance L = 2.0-80.0 m, the width b = 3.0-5.0 m and the length L = 0-5.0 m;
the third step: arranging drainage drill holes in the drainage drill hole fields outside the two sides of the drainage roadway along the coal seam trend, wherein the number of the drill holes is 1-10, the vertical distance between the inner side drill hole and the inner side of the drainage drill hole is 0.5-5.0 m, and the vertical distance between the outer side drill hole and the roadway side of the drainage roadway is 0.5 m;
the fourth step: constructing oblique drainage drill holes in the drainage drill hole site, wherein the diameter phi of the oblique drainage drill holes is = 60-150 mm, the included angle theta between the oblique drainage drill holes and the inclined coal seam layer is = 5-90 degrees, and the distance H between the construction drill holes of the oblique drainage drill holes and the normal of the coal seam is = 0-100 m.
3. The method for efficiently pumping and discharging the gas through the top plate crack propagation as claimed in claim 1, wherein in the second step, the coal seam top plate is cracked by adopting a blasting cracking method, a carbon dioxide cracking method, a hydraulic cracking method and a high-energy pulse cracking method.
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| CN202010200291.4A CN111287787A (en) | 2020-03-20 | 2020-03-20 | Method for efficiently pumping and discharging gas through top plate crack expansion |
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| CN202010200291.4A CN111287787A (en) | 2020-03-20 | 2020-03-20 | Method for efficiently pumping and discharging gas through top plate crack expansion |
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| CN105804788A (en) * | 2016-05-16 | 2016-07-27 | 中国矿业大学 | Method for managing coalbed gas roadway |
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| CN109973140A (en) * | 2019-04-11 | 2019-07-05 | 河南理工大学 | A kind of first mining height effect gas pumping method of high prominent mine large-mining-height working surface |
-
2020
- 2020-03-20 CN CN202010200291.4A patent/CN111287787A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101251028A (en) * | 2008-04-03 | 2008-08-27 | 淮南矿业(集团)有限责任公司 | Method for taking out and picking high gassy seam group dislodging gob-side entry retaining Y type ventilated decompression firedamp |
| CN101403314A (en) * | 2008-11-18 | 2009-04-08 | 河南理工大学 | Coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique |
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