CN107091078B - Coal underground gasification channel and method thereof - Google Patents
Coal underground gasification channel and method thereof Download PDFInfo
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- CN107091078B CN107091078B CN201710453774.3A CN201710453774A CN107091078B CN 107091078 B CN107091078 B CN 107091078B CN 201710453774 A CN201710453774 A CN 201710453774A CN 107091078 B CN107091078 B CN 107091078B
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- 239000003245 coal Substances 0.000 title claims abstract description 202
- 238000002309 gasification Methods 0.000 title claims abstract description 166
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000002347 injection Methods 0.000 claims abstract description 59
- 239000007924 injection Substances 0.000 claims abstract description 59
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 238000004880 explosion Methods 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 238000011084 recovery Methods 0.000 claims abstract description 7
- 239000002360 explosive Substances 0.000 claims description 50
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 abstract description 24
- 230000008569 process Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005422 blasting Methods 0.000 abstract description 7
- 238000005474 detonation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000011440 grout Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005325 percolation Methods 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
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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Abstract
The invention provides an underground coal gasification channel and a method thereof. The gasification channel includes: the gasification device comprises a gasification channel body, a gas injection well, a gas production well and a directional well; wherein, the gas injection well is communicated with the gas recovery well through the gasification channel body; a directional well is arranged in the coal seam to be gasified; and an explosion device is arranged in the directional well so as to make the coal bed to be gasified loose and explode to induce the coal bed to fall. According to the underground coal gasification channel provided by the invention, the development degree of coal seam cracks is improved by loosening and blasting the coal seam through the explosion device, through the gasification process of the underground coal seam, the coal seam around the free channel is gasified to form a combustion space area, the boundary of the combustion space area expands towards the periphery to cause the loosened coal seam to fall off, so that the free channel is converted into a seepage channel, ash accumulated in the coal seam falls off from the coal seam to be gasified, and large-scale lump coal and a fresh coal seam on the surface of the combustion space area can be generated. Therefore, the gasification channel can lead the deposited ash to fall off, thereby greatly improving the effective surface area of the gasification reaction and improving the underground gasification effect of coal.
Description
Technical Field
The invention relates to the technical field of underground coal gasification, in particular to an underground coal gasification channel and a method thereof.
Background
The well drilling type gasification technology utilizes a horizontal directional drill to construct a gasification channel, the gasification channel is a free channel without filler, a gas injection point is arranged at a position close to the tail end of the gasification channel, and the gas injection point is gradually retreated along with the progress of the gasification process to complete the gasification process of a coal seam. In the gasification process, the gasification reaction occurs on the surface of the coal bed around the gas injection point in the free channel, a combustion space area is formed after the coal bed is gradually consumed, the surface area of the combustion space area determines the effective gasification area of the gasification reaction, and the thickness of the ash layer on the surface of the combustion space area determines the gas diffusion rate participating in the gasification reaction. As the gasification process proceeds, although the area of the combustion space area gradually increases, the ash deposition on the surface becomes thicker and thicker, which inhibits the diffusion process of the gas, resulting in a decrease in the gasification reaction rate.
Disclosure of Invention
In view of the above, the invention provides an underground coal gasification channel and a method thereof, and aims to solve the problem of serious surface ash of a coal seam in the existing underground coal gasification.
In one aspect, the present invention provides an underground coal gasification tunnel, comprising: the gasification device comprises a gasification channel body, a gas injection well, a gas production well and a directional well; the gas injection well and the gas recovery well are communicated through the gasification channel body; the directional well is arranged in the coal seam to be gasified; and an explosion device is arranged in the directional well, so that the coal bed to be gasified is loosened and exploded to induce the coal bed to fall.
Furthermore, the plurality of directional wells are arranged on two sides of the gasification channel body in parallel and are spaced from the gasification channel body by a first preset distance; the explosion device is arranged in each directional well.
Furthermore, in the coal underground gasification channel, the directional wells are uniformly arranged in parallel along the length direction of the gasification channel body, and a preset distance is arranged between any two adjacent directional wells along the length direction of the gasification channel body.
Furthermore, in the underground coal gasification channel, a second preset distance is arranged between the explosion device and the top plate of the coal seam to be gasified.
Further, in the underground coal gasification channel, the directional well and the gas production well are arranged in parallel or the axis of the directional well and the axis of the gas production well form an included angle.
Furthermore, in the coal underground gasification channel, the directional well is filled with fillers for sealing the explosion device.
According to the underground coal gasification channel provided by the invention, the development degree of coal seam cracks is improved by loosening and blasting the coal seam through the explosion device, through the gasification process of the underground coal seam, the coal seam around the free channel is gasified to form a combustion space area, the boundary of the combustion space area expands towards the periphery to cause the loosened coal seam to fall off, so that the free channel is converted into a seepage channel, ash accumulated in the coal seam falls off from the coal seam to be gasified, and large-scale lump coal and a fresh coal seam on the surface of the combustion space area can be generated. Therefore, the gasification channel can lead the deposited ash to fall off, thereby greatly improving the effective surface area of the gasification reaction and improving the underground gasification effect of coal.
On the other hand, the invention provides a coal underground gasification method, which comprises the steps of drilling directional wells, namely drilling a plurality of directional wells at two sides of a gasification channel body according to preset intervals; arranging an explosive device at the bottom end of the directional well so that the explosive device is placed in the middle layer of the coal seam to be gasified; arranging a gas injection pipe, namely placing an outlet end of the gas injection pipe at a preset position of the gasification channel body; and detonating, namely detonating the explosive device corresponding to the position of the outlet end of the injection pipe so as to loosen and blast the coal seam.
Further, in the underground coal gasification method, the gas injection pipe arrangement step further comprises: and a sealing step of cementing the directional well to seal the directional well.
Further, the underground coal gasification method further comprises the following steps after the detonation step: and (3) gasifying the coal bed, namely after the coal bed is stable in structure, carrying out gasification reaction on the coal bed by igniting and gasifying agents.
Further, in the underground coal gasification method, after the step of injecting the gasification agent, the method further comprises: a secondary gasification step, namely pulling the injection pipe to retreat for a preset length, detonating the explosion device corresponding to the position of the outlet end of the injection pipe, and performing secondary gasification reaction on the coal bed by igniting and gasifying agents; and repeating the regasification step until the retreat length of the injection pipe is the preset total length.
According to the underground coal gasification method, the development degree of the cracks of the coal seam is improved by loosening and blasting the coal seam through the explosion device, so that a combustion space area is formed when the coal seam around the free channel is gasified, the boundary of the combustion space area expands towards the periphery to cause the loosened coal seam to fall off, the free channel is converted into a seepage channel, ash accumulated in the coal seam falls off from the coal seam to be gasified, and large-scale lump coal and a fresh coal seam on the surface of the combustion space area can be generated. Therefore, the gasification method can make the deposited ash fall off and greatly improve the effective surface area of the gasification reaction so as to improve the underground gasification effect of coal.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic cross-sectional structure diagram of an underground coal gasification channel provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a free channel provided in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a percolation channel provided by an embodiment of the present invention;
FIG. 4 is a schematic top view of an underground coal gasification passage provided by an embodiment of the invention;
FIG. 5 is a schematic flow diagram of a method for underground coal gasification according to an embodiment of the present invention;
FIG. 6 is another schematic flow chart of the underground coal gasification method provided by the embodiment of the invention;
FIG. 7 is another schematic flow chart of the underground coal gasification method provided by the embodiment of the invention;
FIG. 8 is another schematic flow chart of the underground coal gasification method provided by the embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Gasification channel embodiment:
referring to fig. 1, fig. 1 is a schematic cross-sectional structure view of an underground coal gasification channel according to an embodiment of the present invention. As shown, the gasification channel may include: gasification passageway body 4, gas injection well 5, gas recovery well 6 and directional well 1.
Wherein, the gas injection well 5 and the gas recovery well 6 can be communicated through the gasification channel body 4. It will be understood by those skilled in the art that both the gas injection well 5 and the gas production well 6 may be bodies drilled within the coal seam 3 to be gasified from the coal seam roof 31 down the coal seam (relative to the position shown in figure 1). To improve production efficiency, the gas injection well 5 and gas recovery well 6 may preferably be vertical wells or near vertical wells. The gasification channel body 4 is a horizontal well or an approximate horizontal well, and the gas injection well 5 and the gas production well 6 can be communicated through the gasification channel body 4 and are used for exploiting the coal seam 3 to be gasified.
A directional well 1 may be disposed within the coal seam 3 to be gasified. Specifically, the directional well 1 may be a well drilled from the roof 31 of the coal seam down the coal seam (relative to the position shown in FIG. 1). To improve the production efficiency, the directional well 1 may be preferably arranged parallel to the gas production well 6 or the axis of the directional well 1 may be arranged at an angle to the axis of the gas production well 6. To further improve the production efficiency, it is further preferred that both the directional well 1 and the gas recovery well 6 may be vertical well bodies.
An explosive device 2 can be arranged in the directional well 1 so that the coal seam 3 to be gasified is loosened and exploded to induce the coal seam to fall. Specifically, the explosive device 2 may be disposed at the bottom end of the directional well 1, and positioned by the coal seam 3 to be gasified, and of course, a baffle may be disposed in the directional well 1 so as to adjust the position of the explosive device 2. The explosive device 2 is used for triggering the coal seam 3 to be gasified to be loose burst so as to induce the coal seam to fall off to change the structure of the channel from a free channel (shown in figure 2) to a seepage channel (shown in figure 3) so as to change the body of the free channel in the free channel into a gasification area.
It can be seen that, in the coal underground gasification channel provided in this embodiment, the development degree of the coal seam crack is improved by loosening and blasting the coal seam through the explosion device, through the gasification process of the coal underground coal seam, the coal seam around the free channel is gasified to form a combustion space area, the boundary of the combustion space area expands to the periphery to cause the loosened coal seam to fall off, so that the free channel is converted into a seepage channel, ash accumulated in the coal seam falls off from the coal seam to be gasified, and large-scale lump coal and a fresh coal seam on the surface of the combustion space area can be generated. Therefore, the gasification channel can lead the deposited ash in the coal bed to fall off, thereby greatly improving the effective surface area of the gasification reaction so as to improve the underground gasification effect of coal.
Referring to fig. 4, fig. 4 is a schematic top view of an underground coal gasification passage according to an embodiment of the present invention. In the above embodiment, the directional well 1 may be provided in plurality, and the directional wells 1 may be disposed in parallel on two sides of the gasification passage body 4 and spaced apart from the gasification passage body 4 by a first predetermined distance. An explosive device 2 is arranged in each directional well 1.
Specifically, a plurality of directional wells 1 can evenly be divided into two sets of, and two sets of directional wells 1 can be to 4 one-to-one symmetric distributions of gasification passageway body, and each directional well 1 of group all can set up side by side along the length direction of gasification passageway body 4 to, the distance between each directional well 1 of group and the gasification passageway body 4 can be for first preset distance. The first preset distance may be determined according to the explosive device 2 and the distance between the directional well 1 and the gasification passage body 4, which is not limited in this embodiment.
It can be seen that, in this embodiment, through a plurality of directional wells and the explosion device of arranging in gasification passageway body both sides, can further provide the not hard up blasting of coal seam and further improve the development degree of coal seam crack, and then so that more deposition in the coal seam drops with the coal seam of treating gasification to more big size lump coal and the fresh coal seam on combustion space area surface appear, so as to further improve the underground gasification effect of coal.
In the above embodiment, the directional wells 1 may be uniformly arranged in parallel along the length direction of the gasification passage body 4, and any two adjacent directional wells 1 along the length direction of the gasification passage body 4 may be spaced at a preset interval. The preset distance may be determined according to the explosive capability of the explosive device, and is not limited in this embodiment. It can be seen that in this embodiment, the directional wells 1 and the explosion devices 2 which are uniformly arranged in parallel can make the coal seam uniformly loosened and exploded, so as to uniformly improve the development degree of the coal seam fractures.
In the above embodiment, the explosive device 2 may be spaced apart from the coal seam roof 31 of the coal seam 3 to be gasified by a second predetermined distance. In particular, to further improve the loosening and blasting of the coal seam, the second predetermined distance may be equal to the distance that the explosive device 2 may be located from the coal seam floor 32 of the coal seam 3 to be gasified, i.e. the explosive device 2 may be located in an intermediate layer (with respect to the position shown in fig. 1) of the coal seam 3 to be gasified. It can be seen that the restriction in the location of the explosive device 2 ensures that coal above and below the coal seam 3 to be gasified is affected by it.
In the above described embodiment, the directional well 1 may be filled with a filler 7 for sealing the explosive device 2. Specifically, the filler 7 may be concrete, but of course, other fillers may also be used, and this embodiment is not limited to this. Wherein, concrete 7 can be filled in a manner of cement grouting so as to seal the explosive device 2 and prevent other objects from being damaged when the explosive device 2 is detonated.
In summary, in the coal underground gasification channel provided in this embodiment, the explosion device is used to loosen and blast the coal seam to improve the development degree of the coal seam crack, through the gasification process of the coal underground coal seam, the coal seam around the free channel is gasified to form a burned out area, the boundary of the burned out area expands to the periphery to cause the loosened coal seam to fall off, so that the free channel is converted into a seepage channel, and the accumulated ash in the coal seam falls off from the coal seam to be gasified, so that large-scale lump coal and a fresh coal seam on the surface of the burned out area appear. Therefore, the gasification channel can greatly increase the effective surface area of the gasification reaction so as to improve the underground gasification effect of coal.
The embodiment of the gasification method comprises the following steps:
referring to fig. 1 and 5, the method may include the steps of:
and S1, drilling a plurality of directional wells in the coal seam to be gasified at two sides of the gasification channel body according to a preset interval.
Specifically, two rows of a plurality of directional wells 1 which are uniformly arranged in parallel can be drilled in the coal seam 3 to be gasified at a first preset distance along the length direction of the gasification channel body 4 at the position where the distance between the two sides of the gasification channel body 4 and the gasification channel body 4 is the first preset distance. The directional wells 1 may correspond to gas injection points of the coal seam 3 to be gasified during gasification.
And an explosive device arranging step S2, placing an explosive device at the bottom end of the directional well so that the explosive device is placed in the middle layer of the coal seam.
In particular, the explosive device 2 may be placed at the bottom end of the directional well 1, so that the explosive device 2 is located in the middle layer of the coal seam 3 to be gasified to ensure that the explosive device 2 can make the coal seam 3 to be gasified all loose to blast.
And a gas injection pipe arranging step S3 of placing the outlet end of the gas injection pipe at a preset position of the gasification channel body.
Specifically, first, the gas-injection pipe 8 may be fed into the gasification passage body 4, and the outlet end (the right end as viewed in fig. 1) of the gas-injection pipe 8 may be placed at a predetermined position of the gasification passage body 4. The preset position may be determined according to actual conditions, and is not limited in this embodiment. Preferably, the preset position may be a distance from the distal end (right end as viewed in fig. 1) of the gasification passage body 4 up to 1/5 to 1/4 of the total length of the gasification passage body 4.
And a detonation step S4, detonating an explosive device corresponding to the position of the outlet end of the injection pipe to make the coal seam loose and burst.
Specifically, first, the explosive device 2 corresponding to the outlet end (right end as viewed in fig. 1) of the injection pipe 8 is determined. Generally, the explosive device 2 corresponding thereto is located in front (with respect to the position shown in fig. 1) of the outlet end (the right end as shown in fig. 1) of the injection pipe 8. The explosive device 2 may then be detonated to loosely blast the coal seam at the corresponding location.
It can be seen that in the underground coal gasification method provided in this embodiment, the development degree of the coal seam cracks is improved by loosening and blasting the coal seam through the explosion device, so that a combustion space is formed when the coal seam around the free channel is gasified, the boundary of the combustion space expands to the periphery to cause the loosened coal seam to fall off, so that the free channel is converted into a seepage channel, ash deposited in the coal seam falls off from the coal seam to be gasified, and large-scale lump coal and a fresh coal seam on the surface of the combustion space appear. Therefore, the gasification method can make the deposited ash fall off and greatly improve the effective surface area of the gasification reaction so as to improve the underground gasification effect of coal.
Referring to fig. 6, fig. 6 is a schematic flow chart of a coal underground gasification method according to an embodiment of the present invention. As shown, the gasification method may include the steps of:
and S1, drilling directional wells, namely drilling a plurality of directional wells in the coal seam to be gasified at two sides of the gasification channel body according to a preset interval.
And an explosive device arranging step S2, placing an explosive device at the bottom end of the directional well so that the explosive device is placed in the middle layer of the coal seam.
A sealing step S5 may grout the directional well to seal the directional well.
Specifically, concrete may be poured into each of the directional wells 1 by means of cementing to seal the directional wells 1.
And a gas injection pipe arranging step S3 of placing the outlet end of the gas injection pipe at a preset position of the gasification channel body.
And a detonation step S4, detonating the explosive device 2 corresponding to the position of the outlet end of the injection pipe 8 to make the coal seam loose.
It can be seen that in the present embodiment, the directional well 1 is sealed by cementing to seal the explosive device 2, so that other objects can be prevented from being damaged when the explosive device 2 is detonated.
Referring to fig. 7, fig. 7 is another schematic flow chart of the underground coal gasification method according to the embodiment of the invention. As shown, the gasification method may include the steps of:
and S1, drilling a plurality of directional wells in the coal seam to be gasified at two sides of the gasification channel body according to a preset interval.
And an explosive device arranging step S2, placing an explosive device at the bottom end of the directional well so that the explosive device is placed in the middle layer of the coal seam.
A sealing step S5 may grout the directional well to seal the directional well.
And a gas injection pipe arranging step S3, wherein the outlet end of the gas injection pipe is placed at a preset position of the gasification channel body.
And a detonation step S4, detonating an explosive device corresponding to the position of the outlet end of the injection pipe so as to loosen and explode the coal seam.
And S6, gasifying the coal bed, namely after the coal bed is stable in structure, enabling the coal bed to carry out gasification reaction through the action of a gasifying agent and ignition of the coal bed.
Specifically, first, after the geological structure state of the coal seam detonated by the explosive device 2 is stable for a period of time, the coal seam at the tail end (the right end as shown in fig. 1) of the gasification channel body 4 can be ignited; then, a gasifying agent is injected into the preset position of the gasification channel body 4 through the gas injection pipe 8 so as to enable the coal seam to carry out gasification reaction.
It can be seen that in the embodiment, the combustion space area can be expanded towards the periphery in the coal bed gasification process, so that the loosened coal bed above the gasification channel can be overflowed and accumulated in the gasification channel body, the structure of the gasification channel is changed, and the original free channel without fillers is changed into a seepage channel with large-scale lump coal accumulation.
Referring to fig. 8, fig. 8 is another schematic flow chart of the underground coal gasification method according to the embodiment of the present invention. As shown, the gasification method may include the steps of:
and S1, drilling directional wells, namely drilling a plurality of directional wells in the coal seam to be gasified at two sides of the gasification channel body according to a preset interval.
And an explosive device arranging step S2, placing an explosive device at the bottom end of the directional well so that the explosive device is placed in the middle layer of the coal seam.
A sealing step S5 may grout the directional well to seal the directional well.
And a gas injection pipe arranging step S3, wherein the outlet end of the gas injection pipe is placed at a preset position of the gasification channel body.
And a detonation step S4, detonating an explosive device corresponding to the position of the outlet end of the injection pipe to make the coal seam loose and burst.
And S6, gasifying the coal bed, namely after the coal bed is stable in structure, enabling the coal bed to perform gasification reaction under the action of a gasifying agent and igniting the coal bed.
And a re-gasification step S7, after the injection pipe is pulled to retreat for a preset length, an explosion device corresponding to the position of the outlet end of the injection pipe is detonated, and the coal bed is subjected to re-gasification reaction by igniting and gasifying agents.
Specifically, first, one end of the injection pipe 8 may be pulled to retreat the injection pipe 8 by a predetermined length to a later injection point, and then the explosive device 2 corresponding to the gas injection point is detonated, that is, an explosive device 2 located in front of the gas injection point is detonated; and finally, after the coal bed at the tail end of the gasification channel body 4 is ignited, the gas injection point is injected with a gasification agent through the injection pipe 8, so that the coal bed is subjected to gasification reaction again. The preset length may be determined according to actual conditions, and is not limited in this embodiment.
And S8, repeating the regasification step until the retreat length of the injection pipe is the preset total length.
Specifically, the regasification step S7 is repeated until the retreating length of the injection pipe 8 reaches the preset total length until the outlet end of the injection pipe 8 retreats to the last gas injection point to complete the gasification reaction. The preset total length may be determined according to actual conditions, and is not limited in this embodiment.
In summary, in the underground coal gasification method provided in this embodiment, the explosion device is used to loosen and blast the coal seam to improve the development degree of the coal seam cracks, so that a combustion space is formed when the coal seam around the free channel is gasified, the boundary of the combustion space expands around to cause the loosened coal seam to fall off, so that the free channel is converted into a seepage channel, ash deposited in the coal seam falls off from the coal seam to be gasified, and large-scale lump coal and a fresh coal seam on the surface of the combustion space appear. Therefore, the gasification method can lead the deposited ash to fall off, greatly improve the effective surface area of the gasification reaction, and improve the underground gasification effect of coal.
It should be noted that, since the gasification method in the present embodiment is the same as the principle of the gasification channel, the relevant points can be referred to each other.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. An underground coal gasification passage, comprising: the gasification device comprises a gasification channel body (4), a gas injection well (5), a gas production well (6) and a directional well (1); wherein,
the gas injection well (5) is communicated with the gas recovery well (6) through the gasification channel body (4);
the directional well (1) is arranged in the coal seam (3) to be gasified;
an explosion device (2) is arranged in the directional well (1) so that the coal seam (3) to be gasified is loosened and exploded to induce the coal seam to fall;
the number of the directional wells (1) is multiple, and the directional wells (1) are arranged on two sides of the gasification channel body (4) in parallel and are separated from the gasification channel body (4) by a first preset distance;
the directional well (1) and the gas production well (6) are arranged in parallel or the axis of the directional well (1) and the axis of the gas production well (6) form an included angle.
2. The underground coal gasification passage of claim 1,
the explosive device (2) is arranged in each directional well (1).
3. The underground coal gasification passage of claim 2,
the directional wells (1) are uniformly arranged in parallel along the length direction of the gasification channel body (4), and a preset interval is arranged between any two adjacent directional wells (1) along the length direction of the gasification channel body (4).
4. An underground coal gasification tunnel according to claim 2, wherein the explosion device (2) is spaced from the roof (31) of the coal seam (3) to be gasified by a second predetermined distance.
5. A coal underground gasification channel according to any one of claims 1 to 4, characterized in that the directional well (1) is filled with a filler (7) for sealing the explosive device (2).
6. An underground coal gasification method is characterized by comprising the following steps:
drilling a plurality of directional wells in the coal seam to be gasified at preset intervals on two sides of the gasification channel body; the plurality of directional wells are arranged on two sides of the gasification channel body in parallel and are separated from the gasification channel body by a first preset distance; the directional well and the gas production well are arranged in parallel or the axis of the directional well and the axis of the gas production well form an included angle;
arranging an explosive device at the bottom end of the directional well so that the explosive device is placed in the middle layer of the coal seam to be gasified;
arranging a gas injection pipe, namely placing an outlet end of the gas injection pipe at a preset position of the gasification channel body;
detonating the explosive device corresponding to the position of the outlet end of the gas injection pipe so as to loosen and blast the coal bed;
gasifying the coal bed, namely after the coal bed structure is stable, carrying out gasification reaction on the coal bed by igniting and gasifying agents;
a secondary gasification step, namely after the gas injection pipe is pulled to retreat for a preset length, the explosion device corresponding to the position of the outlet end of the gas injection pipe is detonated, and the coal bed is subjected to secondary gasification reaction by igniting and gasifying agents; and repeating the re-gasification step until the retreating length of the gas injection pipe is the preset total length.
7. The underground coal gasification method of claim 6, further comprising, before the gas injection pipe arranging step:
and a sealing step of cementing the directional well to seal the directional well.
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| CN111852434A (en) * | 2020-07-31 | 2020-10-30 | 中国矿业大学 | A physical simulation experiment device and method for underground coal gasification at any angle |
| CN112096358B (en) * | 2020-09-25 | 2022-11-25 | 山东科技大学 | Underground coal gasification mining method for drilling blasting cracking loosening coal seam |
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| GB859352A (en) * | 1958-04-03 | 1961-01-18 | Thayer Lindsley | Improvements in utilization of nuclear energy |
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| CN1419036A (en) * | 2002-12-04 | 2003-05-21 | 新汶矿业集团有限责任公司煤气站 | Coal layer loosening technology for underground gasified furnace |
| CN101463721A (en) * | 2007-12-21 | 2009-06-24 | 庞继禄 | Temperature-controlled explosion method for gasified deep part coal body of coal mine underground coal bed |
| CN102477857B (en) * | 2010-11-30 | 2015-06-03 | 新奥气化采煤有限公司 | Passage formation method for underground coal gasification |
| CN102296945A (en) * | 2011-05-31 | 2011-12-28 | 杨瑞召 | Blasting fracture yield-increasing method for hyposmosis hydrocarbon zone of petroleum producing well |
| AU2012101716A4 (en) * | 2011-12-23 | 2013-01-10 | Linc Energy Ltd | Underground coal gasification in thick coal seams |
| CN104314549B (en) * | 2014-09-26 | 2019-01-15 | 新奥科技发展有限公司 | Coal layer underground gasifying method |
| CN104790949B (en) * | 2015-03-11 | 2016-08-17 | 中国矿业大学(北京) | Huge thick tight roof high methane high seam Roof Control and method and the drilling machine improving gas drainage under suction efficiency |
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