CN112647906B - Method for extracting gas from ground of multi-goaf without coal pillar - Google Patents
Method for extracting gas from ground of multi-goaf without coal pillar Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000003245 coal Substances 0.000 title claims abstract description 29
- 238000000605 extraction Methods 0.000 claims abstract description 145
- 238000005065 mining Methods 0.000 claims abstract description 31
- 238000010276 construction Methods 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 181
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 109
- 229910052757 nitrogen Inorganic materials 0.000 claims description 54
- 238000002347 injection Methods 0.000 claims description 38
- 239000007924 injection Substances 0.000 claims description 38
- 238000012544 monitoring process Methods 0.000 claims description 38
- 230000008569 process Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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- 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
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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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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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
- E21B47/00—Survey of boreholes or wells
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Abstract
The invention provides a coal-pillar-free multi-goaf ground gas extraction method, relates to the technical field of gas extraction, and aims to solve the problem that the existing multi-goaf ground gas extraction method is complex in construction. The method for extracting gas from the ground of the non-coal-pillar multi-goaf comprises the following steps: constructing a gas extraction borehole on the ground, wherein the ground construction position of the gas extraction borehole is positioned above a goaf of a first mining face, and the tail end of the gas extraction borehole extends into a fracture zone of the first mining face for a set distance, wherein the gas extraction borehole only exists in the fracture zone of the first mining face; arranging a gas extraction pipe in the gas extraction drilled hole, and connecting the gas extraction pipe to a ground gas extraction device; and (5) extracting the continuous working surface. The method for extracting the gas from the ground in the multi-goaf without the coal pillar is simple in construction, and the gas extraction in the multi-goaf without the coal pillar can be realized.
Description
Technical Field
The invention relates to the technical field of gas extraction, in particular to a coal-pillar-free multi-goaf ground gas extraction method.
Background
The non-pillar mining is a mining technology for maintaining a roadway in other modes without retaining a roadway-protecting pillar in the coal mining process, and has the advantages of high recovery rate, capability of reducing rock burst, low tunneling rate and low roadway maintenance cost, so that the non-pillar mining is widely applied. However, at present, methods for extracting gas from the ground in multiple goafs are all directed to the situation with coal pillars, and the specific methods are as follows: the method comprises the steps of adopting measures to extract gas existing in fracture fields above a plurality of adjacent goafs respectively, and then concentrating the gas extracted respectively. The ground gas extraction method is complex in construction, and only can realize gas extraction of multiple goafs with coal pillars.
Disclosure of Invention
The invention aims to provide a coal-pillar-free multi-goaf ground gas extraction method, and aims to solve the technical problem that the existing multi-goaf ground gas extraction method is complex in construction.
The invention provides a coal-pillar-free multi-goaf ground gas extraction method, which comprises the following steps: constructing a gas extraction borehole on the ground, wherein the ground construction position of the gas extraction borehole is positioned above a goaf of a first mining surface, and the tail end of the gas extraction borehole extends into a fracture zone of the first mining surface for a set distance, wherein the gas extraction borehole only exists in the fracture zone of the first mining surface; arranging a gas extraction pipe in the gas extraction drilled hole, and connecting the gas extraction pipe to a ground gas extraction device; and (5) extracting the continuous working surface.
Furthermore, in the step of constructing the gas extraction drill holes on the ground, the number of the gas extraction drill holes is multiple, and the multiple gas extraction drill holes are distributed along the coal seam direction in a dispersing manner.
Further, in the step of constructing the gas extraction borehole on the ground, the construction direction of the gas extraction borehole is perpendicular to the coal seam trend and downward.
Further, in the step of constructing the gas extraction borehole on the ground, the set distance is one third of the depth of the fracture zone of the first mining face.
Further, the method also comprises the following steps: and arranging goaf buried pipes in the first goaf and the continuous goaf, connecting the goaf buried pipes to a nitrogen injection pump after each goaf is closed, and introducing nitrogen into each goaf.
Further, in the step of arranging goaf buried pipes in the first goaf and the continuous goaf, the number of the goaf buried pipes arranged in the first goaf is multiple, and the multiple goaf buried pipes arranged in the first goaf are distributed.
Further, in the step of arranging goaf buried pipes in the first goaf and the continuous goaf, the number of the goaf buried pipes arranged in the continuous goaf is multiple, and the multiple goaf buried pipes arranged in the continuous goaf are distributed.
Further, the method also comprises the following steps: and monitoring and controlling the amount of nitrogen injected into the goaf by the nitrogen injection pump, and monitoring and controlling the amount of gas extracted by the ground gas extraction device, so that the amount of nitrogen injected into the goaf by the nitrogen injection pump is equal to the amount of gas extracted by the ground gas extraction device.
Further, the monitoring of the nitrogen amount injected into the goaf by the nitrogen injection pump is realized by a first flow monitoring valve, and the first flow monitoring valve is arranged at the outlet end of the nitrogen injection pump.
Furthermore, the monitoring of the gas quantity extracted by the ground gas extraction device is realized by a second flow monitoring valve, and the second flow monitoring valve is arranged at the inlet end of the ground gas extraction device.
The method for extracting the gas from the ground of the non-coal-pillar multi-goaf has the beneficial effects that:
when the coal-pillar-free multi-goaf ground gas extraction method is used for gas extraction of the coal-pillar-free multi-goaf, a gas extraction borehole can be constructed on the ground above the first-face goaf, wherein the tail end of the gas extraction borehole extends into the first-face fracture zone for a set distance, and the gas extraction borehole only exists in the first-face fracture zone; then, arranging a gas extraction pipe in the gas extraction drill hole, connecting the gas extraction pipe to a ground gas extraction device, and extracting gas in a fracture zone of a first mining face under the action of the ground gas extraction device; and (3) carrying out stoping on the continuous working face, wherein the first mining face goaf and the continuous face goaf form integral caving along with the integral movement of the overlying strata, the first mining face fracture zone is expanded into a continuous face fracture zone, and at the moment, the gas in the continuous face fracture zone is extracted to the ground from the gas extraction drill hole, so that the gas extraction of the coal-pillar-free multi-goaf is realized.
According to the method for extracting the gas from the ground of the multiple goafs without the coal pillars, the gas extraction drill hole is arranged in the fracture zone of the first mining face, so that the purpose of extracting the gas from the subsequent and adjacent goafs without the coal pillars can be achieved, namely: the gas generated in the fracture field in a plurality of adjacent goafs is extracted by using a one-hole multi-extraction mode, so that the construction is simple, and the economic benefit is higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a first stage in gas extraction by using the method for extracting gas from a coal-pillar-free multi-gob ground provided by the embodiment of the invention;
fig. 2 is a schematic plan view of a first stage in gas extraction by using the coal-pillar-free multi-goaf ground gas extraction method provided by the embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of a second stage of gas extraction by using the method for extracting gas from a coal-pillar-free multi-gob ground provided by the embodiment of the invention;
fig. 4 is a schematic plan view of a second stage of gas extraction by using the coal-pillar-free multi-goaf ground gas extraction method provided by the embodiment of the invention.
Description of reference numerals:
100-gas extraction drilling; 110-a gas extraction pipe; 120-a ground gas extraction device; 130-a second flow monitoring valve;
210-first goaf; 220-continuous surface gob;
310-first face fissure zone; 320-splice plane fissure zone;
400-burying the pipes in the goaf;
510-nitrogen gas injection pipe; 520-nitrogen injection manifold; 530-nitrogen injection pump; 540-first flow monitoring valve;
600-a controller;
700-a cable;
810-first mining face air intake lane; 820-splicing face return airway; 830-splicing face air intake lane.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic cross-sectional view of a first stage when gas extraction is performed by using the method for extracting gas from a non-pillar multi-goaf ground provided in this embodiment, fig. 2 is a schematic top view of the first stage when gas extraction is performed by using the method for extracting gas from a non-pillar multi-goaf ground provided in this embodiment, fig. 3 is a schematic cross-sectional view of a second stage when gas extraction is performed by using the method for extracting gas from a non-pillar multi-goaf ground provided in this embodiment, and fig. 4 is a schematic top view of the second stage when gas extraction is performed by using the method for extracting gas from a non-pillar multi-goaf ground provided in this embodiment.
As shown in fig. 1 and fig. 2, the embodiment provides a method for extracting gas from the ground of a multi-goaf without coal pillars, which includes the following steps: constructing a gas extraction borehole 100 on the ground, specifically, the ground construction position of the gas extraction borehole 100 is located above the goaf 210 of the first mining face, and the tail end of the gas extraction borehole 100 extends into the fracture zone 310 of the first mining face for a set distance, wherein the gas extraction borehole 100 only exists in the fracture zone 310 of the first mining face; arranging a gas extraction pipe 110 in the gas extraction borehole 100, and connecting the gas extraction pipe 110 to a ground gas extraction device 120; and (5) extracting the continuous working surface.
When the coal-pillar-free multi-goaf ground gas extraction method is adopted to extract gas in the coal-pillar-free multi-goaf, a gas extraction borehole 100 can be constructed on the ground above the first-face goaf 210, wherein the tail end of the gas extraction borehole 100 extends into the first-face fracture zone 310 for a set distance, and the gas extraction borehole 100 only exists in the first-face fracture zone 310; then, arranging a gas extraction pipe 110 in the gas extraction borehole 100, connecting the gas extraction pipe 110 to a ground gas extraction device 120, and extracting gas in the first mining face fracture zone 310 under the action of the ground gas extraction device 120; as shown in fig. 3 and 4, the continuous working face is stoped, the first goaf 210 and the continuous face goaf 220 are integrally collapsed along with the overall movement of the overlying strata, the first goaf fractured zone 310 is expanded into a continuous face fractured zone 320, and at this time, the gas existing in the continuous face fractured zone 320 is still extracted to the ground through the gas extraction drill hole 100, so that the gas extraction of the coal-pillar-free multi-goaf is realized.
According to the method for extracting the gas from the ground of the multiple goafs without the coal pillars, the gas extraction drill hole 100 is only arranged in the fracture zone 310 of the first mining face, so that the purpose of extracting the gas of the subsequent goafs with the multiple adjacent coal pillars can be achieved, namely: the gas generated in the fracture field in a plurality of adjacent goafs is extracted by using a one-hole multi-extraction mode, so that the construction is simple, and the economic benefit is higher.
It should be noted that when no coal pillar is mined, the overburden rock moves integrally, the overburden rock of a plurality of adjacent goafs can be caused to form integral collapse, and the formed overburden rock fracture zones reach a mutual communication state, so that the gas generated in the fracture zones of the plurality of adjacent goafs can be directly extracted by adopting the single-side gas extraction drill hole 100.
With continued reference to fig. 2 and 4, in the present embodiment, in the step of constructing the gas extraction borehole 100 on the ground, the number of the gas extraction boreholes 100 is multiple, and the multiple gas extraction boreholes 100 are distributed along the coal seam strike. That is, the gas extraction boreholes 100 constructed in the ground are grouped.
Through the arrangement of the group of gas extraction drill holes 100 which are distributed along the coal seam direction in a dispersing manner, when the ground gas extraction device 120 works, gas extraction is performed at a plurality of positions along the coal seam direction, and the gas extraction efficiency is improved.
It should be noted that the direction indicated by the arrow ab in fig. 2 and 4 indicates the coal seam strike. In fig. 1, the first-face air intake lane and the continuous-face air intake lane 830 are respectively provided on the left side and the right side of the first-face gob 210, and in fig. 3, the continuous-face gob 220 and the first-face gob 210 are integrally collapsed, and the first-face air intake lane 810 and the continuous-face return lane 820 are respectively provided on the left side and the right side.
It should be noted that in fig. 1 to 3, the 45 ° diagonal cross line represents an unexplored coal seam.
Referring to fig. 1 and fig. 3, in the present embodiment, in the step of constructing the gas extraction borehole 100 on the ground, the construction direction of the gas extraction borehole 100 is perpendicular to the coal seam direction and downward. So set up, shortened the length of gas drainage drilling 100, on the one hand, further improved the efficiency of construction, on the other hand has shortened gas exhaust route for gas in the fissure area can discharge fast.
Preferably, in the step of constructing the gas extraction borehole 100 on the ground, the distance that the tail end of the gas extraction borehole 100 extends into the first mining face fractured zone 310 is one third of the depth of the first mining face fractured zone 310. So set up, can realize taking out smoothly of gas in the fracture area.
With reference to fig. 1 and fig. 3, in this embodiment, the method for extracting gas from the ground in the multiple goafs without coal pillars further includes: and arranging goaf buried pipes 400 in the first goaf 210 and the continuous goaf 220, and connecting the goaf buried pipes 400 to a nitrogen injection pump 530 to introduce nitrogen into each goaf after each goaf is closed.
When the coal-pillar-free multi-goaf ground gas extraction method is used for gas extraction, the nitrogen injection pump 530 can be started at the same time, and nitrogen is introduced into the goaf buried pipe 400 by the nitrogen injection pump 530, so that nitrogen supplement to the goaf is realized. According to the arrangement, the height of gas in the goaf can be continuously increased, so that the ground gas extraction concentration is ensured, the goaf is prevented from generating negative pressure due to gas extraction, the gas pressure in the goaf is effectively stabilized, disasters caused by the fact that underground air enters the closed goaf due to the fact that negative pressure is formed due to gas extraction are avoided, and the safety of the coal-pillar-free multi-goaf ground gas extraction process is improved.
With continued reference to fig. 1 and 3, specifically, in the step of arranging the goaf buried pipes 400 in the first goaf 210 and the continuous goaf 220, the number of the goaf buried pipes 400 arranged in the first goaf 210 is plural, and the plural goaf buried pipes 400 arranged in the first goaf 210 are distributed.
So set up, can increase the distribution area of collecting space area buried pipe 400 at first face collecting space area 210 for in the gas drainage process, a plurality of positions of first face collecting space area 210 all can receive the replenishment of nitrogen gas, have guaranteed the pressure uniformity of each position of first face collecting space area 210.
With continued reference to fig. 1 and 3, specifically, in the step of arranging the goaf buried pipes 400 in the first goaf 210 and the continuous goaf 220, the number of goaf buried pipes 400 arranged in the continuous goaf 220 is also plural, and the plural goaf buried pipes 400 arranged in the continuous goaf 220 are distributed.
By the arrangement, the distribution area of the goaf buried pipe 400 in the continuous surface goaf 220 can be increased, so that in the gas extraction process, a plurality of positions of the continuous surface goaf 220 can be supplemented by nitrogen, and the pressure consistency of all the positions of the continuous surface goaf 220 is ensured.
With continued reference to fig. 1-4, in the present embodiment, each gob buried pipe 400 is connected to a nitrogen injection pipe 510, each nitrogen injection pipe 510 is connected to a nitrogen injection manifold 520, and the nitrogen injection manifold 520 is connected to a nitrogen injection pump 530. That is, after the nitrogen injection pump 530 is turned on, nitrogen enters the nitrogen injection manifold 520, and then enters the nitrogen injection pipes 510 during the flowing of nitrogen in the nitrogen injection manifold 520, and further flows toward the gob through the gob burying pipe 400.
Specifically, in this embodiment, the method for extracting gas from the ground in the multiple goafs without the coal pillar further includes the steps of: the amount of nitrogen injected into the gob by the nitrogen injection pump 530 is monitored and controlled, and the amount of gas extracted by the ground gas extraction device 120 is monitored and controlled, so that the amount of nitrogen injected into the gob by the nitrogen injection pump 530 is equal to the amount of gas extracted by the ground gas extraction device 120. So set up, can guarantee the balance of gas drainage and nitrogen gas injection to guarantee the stability of gas drainage operation.
Referring to fig. 1 to 4, in the present embodiment, the monitoring of the amount of nitrogen injected into the gob by the nitrogen injection pump 530 is implemented by the first flow monitoring valve 540, and the first flow monitoring valve 540 is disposed at the outlet end of the nitrogen injection pump 530. So set up for the staff utilizes a first flow monitoring valve 540 alright know current nitrogen gas and pour into the total amount, and not only convenient and fast saves space moreover, the setting of being convenient for.
Referring to fig. 1 to 4, in the present embodiment, the monitoring of the gas extracted by the surface gas extraction device 120 is implemented by the second flow monitoring valve 130, and the second flow monitoring valve 130 is disposed at the inlet end of the surface gas extraction device 120. So set up for the staff utilizes a second flow monitoring valve 130 alright to learn current gas drainage total amount, and not only convenient and fast saves space moreover, is convenient for set up.
In this embodiment, the ground gas extraction device 120, the nitrogen injection pump 530, the first flow rate monitoring valve 540, and the second flow rate monitoring valve 130 are all connected to the controller 600 through the cable 700, and in the use process, the controller 600 is used to control the opening degrees of the first flow rate monitoring valve 540 and the second flow rate monitoring valve 130, so as to control the total nitrogen injection amount and the total gas extraction amount.
It should be noted that how to monitor the total amount of nitrogen injected by using the first flow monitoring valve 540, how to monitor the total amount of gas extraction by using the second flow monitoring valve 130, and how to control the first flow monitoring valve 540 and the second flow monitoring valve 130 by using the controller 600 are available to those skilled in the art according to the prior art, which are not improvement points of the present application, and therefore, no further description is given.
The process of gas extraction by adopting the coal-pillar-free multi-goaf ground gas extraction method is as follows.
A group of gas extraction drill holes 100 are vertically and downwardly constructed in the position of a fissure zone above a ground-facing first mining face goaf 210 along the direction of the coal seam, the tail ends of the gas extraction drill holes 100 extend into the position of one third of the first mining face fissure zone 310 (away from the upper end of the first mining face fissure zone 310), all the gas extraction drill holes 100 and the ground gas extraction device 120 are connected through a gas extraction pipe 110, and the total amount of ground extracted gas is monitored and controlled through a second flow monitoring valve 130; the method comprises the following steps that (1) a goaf buried pipe 400 is arranged in the goaf along with the advance of a working face in the coal seam mining process, the goaf buried pipe 400 is connected with a nitrogen injection pipe 510 and then is uniformly connected with a nitrogen injection main pipe 520 after the goaf is closed, the nitrogen injection main pipe 520 is connected with a nitrogen injection pump 530, and the total nitrogen injection amount is monitored and controlled by a first flow monitoring valve 540; the first flow monitoring valve 540, the second flow monitoring valve 130 and the controller 600 are connected through a cable 700, and the controller 600 is used for controlling the total amount of surface gas extraction and the total amount of downhole nitrogen injection.
When the continuous working face is stoped, the first goaf 210 and the continuous face goaf 220 form integral caving along with the integral movement of overlying strata, the first goaf fissure zone 310 is expanded into a continuous face fissure zone 320, gas in the continuous face fissure zone 320 is still extracted to the ground through the gas extraction drill hole 100, one-hole multi-extraction is achieved, and construction is simple.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the above embodiments, the descriptions of the orientations such as "up", "down", and the like are based on the drawings.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A coal pillar-free multi-goaf ground gas extraction method is characterized by comprising the following steps:
constructing a gas extraction borehole (100) on the ground, wherein the ground construction position of the gas extraction borehole (100) is located above a first mining face goaf (210), and the tail end of the gas extraction borehole (100) extends into a first mining face fracture zone (310) for a set distance, wherein the gas extraction borehole (100) only exists in the first mining face fracture zone (310);
arranging a gas extraction pipe (110) in the gas extraction borehole (100), and connecting the gas extraction pipe (110) to a ground gas extraction device (120);
and (5) extracting the continuous working surface.
2. The coal-pillar-free multi-gob ground gas extraction method according to claim 1, characterized in that in the step of constructing the gas extraction boreholes (100) on the ground, the number of the gas extraction boreholes (100) is multiple, and the multiple gas extraction boreholes (100) are distributed along the coal seam direction.
3. The coal-pillar-free multi-gob ground gas extraction method according to claim 1, wherein in the step of constructing the gas extraction borehole (100) on the ground, the construction direction of the gas extraction borehole (100) is perpendicular to the coal seam direction and downward.
4. The method for extracting gas from the ground in the coal-pillar-free and multi-gob area according to claim 1, wherein in the step of constructing the gas extraction borehole (100) on the ground, the set distance is one third of the depth of the fracture zone (310) of the first mining face.
5. The method for extracting gas from the ground of the non-coal-pillar multi-gob area according to any one of claims 1 to 4, further comprising the steps of: and arranging goaf buried pipes (400) in the first goaf (210) and the continuous goaf (220), and connecting the goaf buried pipes (400) to a nitrogen injection pump (530) after each goaf is closed, and introducing nitrogen into each goaf.
6. The coal-pillar-free multi-gob ground extraction method according to claim 5, wherein in the step of arranging the gob buried pipes (400) in the first gob (210) and the subsequent gob (220), the number of the gob buried pipes (400) provided in the first gob (210) is plural, and the plural gob buried pipes (400) provided in the first gob (210) are arranged in a dispersed manner.
7. The coal-pillar-free multi-gob ground gas extraction method according to claim 5, characterized in that in the step of arranging gob buried pipes (400) in the first gob (210) and the continuous gob (220), the number of gob buried pipes (400) arranged in the continuous gob (220) is multiple, and the plurality of gob buried pipes (400) arranged in the continuous gob (220) are distributed.
8. The method for extracting gas from the ground of the non-coal-pillar multi-gob area according to claim 5, further comprising the steps of: and monitoring and controlling the amount of nitrogen injected into the goaf by the nitrogen injection pump (530), and monitoring and controlling the amount of gas extracted by the ground gas extraction device (120), so that the amount of nitrogen injected into the goaf by the nitrogen injection pump (530) is equal to the amount of gas extracted by the ground gas extraction device (120).
9. The method for extracting gas from the ground in the multiple goafs without the coal pillar according to claim 8, wherein the monitoring of the amount of nitrogen injected into the goaf by the nitrogen injection pump (530) is performed by a first flow monitoring valve (540), and the first flow monitoring valve (540) is disposed at an outlet end of the nitrogen injection pump (530).
10. The method for extracting gas from the ground in the coal-pillar-free and multi-gob area according to claim 8, wherein the monitoring of the gas extracted by the ground gas extraction device (120) is realized by a second flow monitoring valve (130), and the second flow monitoring valve (130) is arranged at the inlet end of the ground gas extraction device (120).
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| CN114165196A (en) * | 2021-12-06 | 2022-03-11 | 中国矿业大学 | Comprehensive efficient extraction method for closing coal bed gas in-situ-goaf of coal mine |
| CN117145568B (en) * | 2023-10-11 | 2024-03-12 | 郑州煤电股份有限公司告成煤矿 | Bottom drainage roadway gas collection equipment and drainage process |
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