CN118187739A - Composite coal seam drilling and sectional hole sealing process method - Google Patents
Composite coal seam drilling and sectional hole sealing process method Download PDFInfo
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- CN118187739A CN118187739A CN202410329990.7A CN202410329990A CN118187739A CN 118187739 A CN118187739 A CN 118187739A CN 202410329990 A CN202410329990 A CN 202410329990A CN 118187739 A CN118187739 A CN 118187739A
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- 238000007789 sealing Methods 0.000 title claims abstract description 88
- 238000005553 drilling Methods 0.000 title claims abstract description 58
- 239000003245 coal Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 title description 3
- 238000000605 extraction Methods 0.000 claims abstract description 75
- 238000005065 mining Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 238000007569 slipcasting Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 229910052622 kaolinite Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention belongs to the technical field of underground coal mine gas control, and particularly relates to a method for sectionally sealing holes of a composite thick coal seam drilling hole. The method for extracting the gas by drilling and sectionally sealing holes in the composite coal seam can avoid soft layering to block the extraction pipe and improve the gas extraction efficiency.
Description
Technical Field
The invention belongs to the technical field of underground coal mine gas control, and particularly relates to a method for extracting gas by drilling and sectionally sealing holes in a composite thick coal seam.
Background
The occurrence of thick coal seams is often accompanied by soft layering, and in soft layering, water-swellable silt shale, carbonaceous shale, kaolinite clay and other swellable shale are mainly used. The expandable mudstone is compact and has poor air permeability, the upper and lower coal-bearing layers are difficult to effectively diffuse the gas, the gas enrichment is easy to form, and the expandable mudstone has the characteristics of extremely easy rapid expansion, mud formation, softening, shrinkage deformation and the like under the action of external water invasion due to the special rock composition components of the expandable mudstone and strong hydrophilicity of internal clay minerals.
In the related art, an automatic water-absorbing, plugging and sealing device and method for a near-horizontal coal seam gas extraction drill hole are provided, coal seam gas is extracted through the drill hole, but after the drill hole is finished, the drill hole diameter of a soft layering part is easy to shrink, a soil layer of the soft layering part is easy to cause screen pipe blockage during gas extraction, and gas extraction efficiency is reduced.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a method for extracting gas by drilling and sectionally sealing holes in a composite coal seam, which can avoid soft layering to block an extraction pipe and improve gas extraction efficiency.
The method for extracting gas by drilling and sectionally sealing holes in the composite coal seam provided by the embodiment of the invention comprises the following steps: determining the position of soft layering in the underground coal seam during coal mining, drilling the coal seam, confirming the position of the soft layering in the drilling,
The extraction pipe and the communicating pipe are put into the drill hole, the communicating pipe is at least partially arranged in the soft layer, the two ends of the drill hole positioned in the soft layer are sealed, the position of the communicating pipe in the extending direction of the drill hole corresponds to the position of the soft layer in the extending direction of the drill hole,
And (5) carrying out gas extraction in the drill hole through the communicating pipe and the extraction pipe.
According to the method for extracting gas by drilling and sectionally sealing holes in the composite coal seam, disclosed by the embodiment of the invention, the soft layering blocking of the extraction pipe can be avoided, and the gas extraction efficiency is improved.
In some embodiments, when the communicating pipe is put in, hole sealing components are arranged at two ends of the soft layering of the preset communicating pipe, and after drilling is finished, the hole sealing components are sleeved on the communicating pipe, so that grouting is carried out on the hole sealing components.
In some embodiments, the communicating pipe and the extraction pipe are hollow pipes, and through holes are formed in the circumferential direction of the extraction pipe so as to facilitate gas extraction.
In some embodiments, a plurality of hole sealing members are provided at both ends of the communication pipe, the plurality of hole sealing members being arranged at intervals in an extending direction of the communication pipe.
In some embodiments, the plurality of hole sealing members increases in radial dimension one by one in a direction away from the soft layering after grouting is completed.
In some embodiments, the grouting pressure is maintained to be 0.8-2.0MPa when grouting the hole sealing component.
In some embodiments, a casing is provided at the borehole entry.
In some embodiments, a hole packer is disposed on a side of the casing remote from the borehole inlet, and the hole packer is sleeved on the casing.
In some embodiments, the number of hole sealers is a plurality, and the hole sealers are spaced apart on the casing.
In some embodiments, a plurality of limit clips are disposed on the communication pipe, and the plurality of limit clips are fixed on two sides of the hole sealing component along the extending direction of the communication pipe.
Drawings
FIG. 1 is a cross-sectional view of a composite coal seam in accordance with an embodiment of the present invention.
Reference numerals:
The soft-layer 1 is formed by a layer,
Coal seam 2, borehole 3, first section 31, second section 32, third section 33,
A communicating pipe 4, a suction pipe 5, a hole sealing component 6, a hole packer 7, a sleeve 8, a suction pipe 9 and a suction device 10.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The method for extracting gas by drilling and sectionally sealing the composite coal seam in the embodiment of the invention comprises the steps of determining the position of a soft layer 1 in an underground coal seam 2 during coal mining, drilling a hole 3 on the coal seam 2, confirming the position of the soft layer 1 in the hole 3, lowering a extraction pipe 5 and a communicating pipe 4 into the hole 3, arranging the communicating pipe 4 at least partially in the soft layer 1, sealing the two ends of the soft layer 1 at the hole 3, and extracting gas in the hole 3 through the communicating pipe 4 and the extraction pipe 5, wherein the position of the communicating pipe 4 in the extending direction of the hole 3 corresponds to the position of the soft layer 1 in the extending direction of the hole 3.
Specifically, as shown in fig. 1, the position of the soft layer 1 in the underground coal seam 2 is determined during coal mining, it can be understood that during coal mining, some exploration work can be performed in the underground coal mine during the mining activity, and the exploration data can display occurrence conditions of the soft layer 1. For example, when coal is mined, the thickness of the whole coal seam 2 is confirmed, geological structures are identified through geological radars and bottom penetrating radars, and further, soft layers 1 or the coal seam 2 in the vertical direction of a working surface are confirmed, for example, soft layers 1 exist at a position 10m above the mining working surface, or whether the soft layers 1 are in composite distribution or not is determined, for example, soft layers 1 are mixed in the coal seam 2 above the mining working surface.
When the coal seam 2 is drilled 3 in a mining working face, and when the drill hole 3 is drilled, whether the soft layer 1 is drilled is determined through the change of the water return quantity by a drilling hole 3 motor of the drilling machine, and the soft layer 1 is mainly made of water-swelling silt shale, carbonaceous shale, kaolinite clay and other swelling shale, so that when the drilling machine equipment drills from the coal seam 2 to the soft layer 1 in the drilling process, the water return quantity and the water return color in the drill hole 3 change, for example, the water return quantity is reduced, and the water return color changes from black to grey white. At the same time the drive motor Shui Yashang litres of the rig and the feed pressure of the rig is varied, for example Shui Yashang litres of the drive motor of the rig and the feed pressure of the rig is increased when drilling the soft zone 1. The drilling to the soft zone 1 is now determined by the amount of drilling return water, the color of the return water, the rig feed force feedback and the driving motor water pressure. When the soft layer 1 is drilled into the coal seam 2, the water pressure of the driving motor of the drilling machine is reduced, the color of the returned water is changed from grey to black, and simultaneously the feeding pressure of the drilling machine is reduced, at the moment, the soft layer 1 is drilled through, the drilling machine is drilled into the coal seam 2 again, the position of the soft layer 1 in the drill hole 3 is determined, for example, when the soft layer 1 is just drilled, the length of a drill rod is marked and measured, the position of the soft layer 1 just drilled into the drill hole 3 is determined, then when the soft layer 1 is drilled, the length of the drill rod is marked and measured,
And further determining the range of the soft layer 1 in the drill hole 3, after the drill hole 3 is finished, putting the communicating pipe 4 and the extraction pipe 5 into the drill hole 3 one by one, putting the section of the drill hole 3 corresponding to the soft layer 1 in the drill hole 3 into the communicating pipe 4, putting the section of the drill hole 3 outside the soft layer 1 into the extraction pipe 5, sealing the two ends of the section of the drill hole 3 positioned in the soft layer 1, for example, setting the section of the drill hole 3 positioned in the soft layer 1 as a first section 31, setting the drill hole 3 into a second section 32 and a third section 33, setting the second section 32 and the third section 33 in the coal seam 2, communicating the outlet of the second section 32 with the inlet of the first section 31, communicating the outlet of the inlet of the first section 31 of the third section 33, sealing the two ends of the first section 31, and further preventing mudstone in the first section 31 from flowing into the second section 32 or the third section 33, and arranging the extraction pipe 5 in the second section 32 and the third section 33 to perform gas extraction. The inlet of the drill hole 3 is the inlet of the second section 32, and the third section 33 is the part of the drill hole 3 far away from the inlet of the drill hole 3, namely, if the first section 31 is reduced in diameter or blocked, the gas in the third section 33 cannot be extracted without the connecting pipe in the first section 31.
Namely, the two ends of the first section 31 are sealed, so that the phenomenon that mud rocks in the soft layering 1 in the first section 31 flow to enter the extraction pipe 5 to cause the extraction pipe 5 to interrupt the extraction of gas because mud rocks enter the extraction pipe 5 is avoided. Specifically, grouting can be performed on two ends of the communicating pipe 4 in the first section 31, the slurry is located between the communicating pipe 4 and the inner wall surface of the first section 31, and the inner wall surface of the first section 31 is supported after the slurry is solidified and formed. And then with soft layering 1 shutoff completely, avoid soft layering 1 lockhole to lead to the drilling 3 of soft wind layer one side unable to carry out the drainage of gas, improve the length that can take out the gas in the drilling 3.
It should be noted that, the communicating pipe 4 and the extraction pipe 5 are sequentially connected so that the extraction device 10 extracts the gas extracted by the extraction pipe 5 from the drill hole 3, at this time, the communicating pipe 4 is only used as the flow of the gas extracted by the extraction pipe 5, for example, the gas of the third section 33 firstly enters the extraction pipe 5 in the third section 33, then enters the communicating pipe 4 of the first section 31, then enters the extraction pipe 5 of the second section 32, and finally enters the extraction device 10 to extract the gas. I.e. the communication pipe 4 facilitates the extraction device 10 to draw the gas in the third section 33 into the extraction device 10,
Because the length of the actual drilling hole 3 is relatively long, the number of communicating pipes 4 in the first section 31 is a plurality of, the communicating pipes 4 in the first section 31 are connected end to end, correspondingly, the number of the extraction pipes 5 in the second section 32 is a plurality of, the communicating pipes 4 in the first section 31 are connected end to end, the number of the extraction pipes 5 in the third section 33 is a plurality of, the communicating pipes 4 in the first section 31 are connected end to end, after the drilling hole 3 is finished, the number and the length of the communicating pipes 4 in the first section 31 are adjusted according to the actual length of the soft layer 1 so that at least part of the communicating pipes 4 are arranged in the first section 31,
According to the method for extracting gas by drilling and sectionally sealing holes in the composite coal seam, disclosed by the embodiment of the invention, the two ends of the first section 31 are sealed, so that the soft layer 1 is sealed, the soft layer 1 can be prevented from blocking the extraction pipe 5, and the gas extraction efficiency is improved.
In some embodiments, when the communicating pipe 4 is put in, hole sealing components 6 are arranged at two ends of the soft layer 1 at the preset communicating pipe 4, after the drilling 3 is finished, the hole sealing components 6 are sleeved on the communicating pipe 4, and grouting is carried out on the hole sealing components 6.
Specifically, as shown in fig. 1, the hole sealing component 6 may be a bag hole packer, the hole sealing component 6 is disposed at two ends of the inlet and the outlet of the communicating pipe 4 located at the first section 31, after the drilling 3 is finished, grouting is performed on the hole sealing component 6, the radial dimension of the hole sealing component 6 is increased to contact the outer peripheral surface of the hole sealing component 6 with the inner wall surface of the drilling 3, the first section 31 is further isolated from the second section 32 and the third section 33, the first section 31 is sealed, mud rock of the soft layer 1 is prevented from flowing into the extraction pipes 5 of the first section 31 to the second section 32 and the third section 33, and further the blockage of the extraction pipes 5 is avoided, and meanwhile, the reduction of the length of gas which can be extracted by the drilling 3 due to the diameter shrinkage and the blockage of the soft layer 1 is avoided, the length of gas extraction of the coal seam 2 is improved, the blockage of the extraction pipes 5 due to the soft layer 1 is avoided, and the gas extraction efficiency is improved.
According to the method for extracting gas by drilling and sectionally sealing holes in the composite coal seam, provided by the embodiment of the invention, the hole sealing parts 6 are arranged at the two ends of the first section 31 to seal the inlet and the outlet of the first section 31, so that the soft layer 1 is sealed, the soft layer 1 can be prevented from blocking the extraction pipe 5, and the gas extraction efficiency is improved.
Further, the communicating pipe 4 and the extraction pipe 5 are hollow pipes, and through holes are formed in the circumferential direction of the extraction pipe 5 so as to facilitate gas extraction. Namely, the communicating pipe 4 and the extraction pipe 5 are hollow pipes, and a plurality of through holes are formed in the periphery of the extraction pipe 5 so as to facilitate gas extraction. The through holes are also arranged at intervals in the extending direction of the extraction pipe 5 to extract gas, the communicating pipe 4 is at least partially arranged in the first section 31, the interval between the communicating pipe 4 extending out of the first section 31 and the inlet or outlet of the first section 31 can be set, the extraction pipe 5 adjacent to the inlet or outlet of the first section 31 is further prevented from being far away from the first section 31, mud rock is prevented from flowing into the extraction pipe 5 due to too close interval between the extraction pipe 5 and the first section 31, the communicating pipe 4 and the extraction pipe 5 are arranged, and then the communicating pipe 4 is only used as a tool for gas in the third section 33 to pass through the soft layering 1, so that the gas in the third section 33 cannot be extracted due to shrinkage of the soft layering 1 after the drilling 3 is prevented, and the gas extraction quantity and efficiency are improved.
In some embodiments, a plurality of sealing members 6 are provided at both ends of the communication pipe 4, the plurality of sealing members 6 being arranged at intervals in the extending direction of the communication pipe 4.
Specifically, as shown in fig. 1, the number of hole sealing parts 6 is multiple, the hole sealing parts 6 are sleeved at two ends of the communicating pipe 4 in the first section 31, and the hole sealing parts 6 on the same side are arranged at intervals in the extending direction of the communicating pipe 4, so that the first section 31 is sealed, the sealing effect of the first section 31 is improved, and the influence of mudstone outflow in the first section 31 on gas extraction is avoided.
According to the method for extracting gas by drilling and sectionally sealing holes in the composite coal seam, disclosed by the embodiment of the invention, the plurality of hole sealing parts 6 are arranged at the two ends of the first section 31 to seal the inlet and the outlet of the first section 31, so that the soft layer 1 is sealed, the soft layer 1 is prevented from blocking the extraction pipe 5, and the stability and the safety of gas extraction are improved.
In some embodiments, after grouting is completed, the dimensions of the plurality of hole sealing members 6 in the radial direction increase one by one in a direction away from the soft segment 1.
Specifically, as shown in fig. 1, the hole sealing parts 6 sleeved at two ends of the communicating pipe 4 are gradually increased along the direction away from the soft layer 1, that is, the hole sealing parts 6 sleeved at two ends of the communicating pipe 4 are gradually increased along the direction away from the first section 31, for example, the first section 31 extends along the left-right direction, the radial sizes of the plurality of hole sealing parts 6 arranged at the left end of the first section 31 are gradually increased from right to left, that is, when the hole sealing parts 6 are bag hole sealing devices, the radial sizes of the bag hole sealing devices sleeved on the communicating pipe 4 at the left end of the first section 31 are gradually increased from right to left, so that left-end mudstones are prevented from flowing out of the first section 31, correspondingly, the radial sizes of the plurality of hole sealing parts 6 arranged at the right end of the first section 31 are gradually increased from left to right, that is, when the hole sealing parts 6 are bag hole sealing devices, the radial sizes of the bag sealing devices sleeved on the communicating pipe 4 at the right end of the first section 31 are gradually increased from left to right to left, so that the left end mudstones are prevented from flowing out of the first section 31, and the sealing effect on the first section 31 is improved.
Further, the hole sealing component 6 is sleeved on the part of the communicating pipe 4 outside the first section 31, grouting is performed on the hole sealing component 6 on the communicating pipe 4 outside the first section 31 so as to seal one ends of the second section 32 and the third section 33 close to the first section 31, the sealing effect on the first section 31 is further improved, and further the gas extraction efficiency is improved.
In some embodiments, the grouting pressure is maintained to be 0.8-2.0 MPa when grouting the hole sealing component 6.
Specifically, as shown in FIG. 1, the grouting pressure may be 0.8MPa, 0.9MPa, 1.0MPa, 1.1MPa, 1.2MPa, 1.3MPa, 1.4MPa, 1.5MPa, 1.6MPa, 1.7MPa, 1.8MPa, 1.9MPa, 2.0MPa. Through setting up the slip casting pressure, when the slip casting pressure is less than 0.8MPa, because the slip casting pressure is too low at this moment leads to slip casting volume and hole sealing part 6 structural strength to be less than the preset scope, and then influences grouting effect and the sealed effect to soft layering 1, when the slip casting pressure is higher than 2.0MPa, the slip casting pressure is too high and probably leads to hole sealing part 6 unusual and lead to sealed effect to descend.
According to the method for extracting gas through the sectional hole sealing of the composite coal seam drilling holes, disclosed by the embodiment of the invention, by setting the grouting pressure of the hole sealing component 6, the occurrence of abnormality during grouting is avoided, the soft layer 1 is further sealed, the soft layer 1 is prevented from blocking the extraction pipe 5, and the stability and safety during gas extraction are improved.
Further, a casing 8 is provided at the entrance of the borehole 3. The radial dimension of the casing 8 gradually decreases in a direction away from the borehole 3. After the drilling 3 is finished, the casing pipe 8 is put down, the inlet of the drilling 3 is fixed, namely, the inlet of the second section 32 is fixed, collapse of the inlet of the drilling 3 is avoided, gas extraction is avoided, it can be understood that the extraction pipe 5 at the inlet of the drilling 3 is replaced by the communicating pipe 4, sundries are prevented from entering equipment for extracting gas caused by the arrangement of the extraction pipe 5 at the inlet of the drilling 3, and stability and safety of the extracted gas are improved.
Further, a suction pipe 9 of the gas extraction device 10 is arranged in the sleeve 8, and after the sleeve 8 is fixed, an inlet of the suction pipe 9 is communicated with an outlet of the extraction pipe 5 so as to extract the gas.
In some embodiments, a hole packer 7 is provided on a side of the casing 8 remote from the inlet of the borehole 3, and the hole packer 7 is sleeved on the casing 8.
Specifically, as shown in fig. 1, the hole packer 7 is sleeved on the sleeve 8, and the hole packer 7 is arranged between the sleeve 8 and the inner wall surface of the second section 32, and the hole packer 7 is injected to improve the fixing effect of the sleeve 8 on the inlet of the drilling hole 3, and the stability and safety of the inlet of the drilling hole 3 when gas is extracted.
Further, the number of the hole sealers 7 is multiple, and the hole sealers 7 are arranged on the sleeve 8 at intervals, so that the supporting effect on the inlet of the second section 32 is improved, and the stability and safety of gas extraction are improved.
In some embodiments, a plurality of limit clips are provided on the communication pipe 4, and the plurality of limit clips are fixed to both sides of the hole sealing member 6 in the extending direction of the communication pipe 4.
Specifically, as shown in fig. 1, the limiting hoops are arranged at two ends of the hole sealing component 6 to limit and fix the hole sealing component 6, so that when the hole sealing component 6 is placed into the drill hole 3 through the communicating pipe 4 and the extraction pipe 5, friction is generated between the inner wall surface of the drill hole 3 and the hole sealing component 6, and then the drill hole 3 component moves to reduce the sealing effect on the inlet and the outlet of the first section 31, so that the stability and the safety of gas extraction are improved.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The method for extracting gas by drilling and sectionally sealing holes in a composite coal seam is characterized by comprising the following steps of:
determining the position of soft layering in the underground coal seam during coal mining, drilling the coal seam, confirming the position of the soft layering in the drilling,
The extraction pipe and the communicating pipe are put into the drill hole, the communicating pipe is at least partially arranged in the soft layer, the two ends of the drill hole positioned in the soft layer are sealed, the position of the communicating pipe in the extending direction of the drill hole corresponds to the position of the soft layer in the extending direction of the drill hole,
And (5) carrying out gas extraction in the drill hole through the communicating pipe and the extraction pipe.
2. The method for extracting gas by drilling and sectionally sealing holes in a composite coal seam according to claim 1, wherein hole sealing parts are arranged at two ends of a soft layering of a preset communicating pipe when the communicating pipe is put in, and the hole sealing parts are sleeved on the communicating pipe after the drilling is finished, so that grouting is carried out on the hole sealing parts.
3. The method for extracting gas by drilling and sectionally sealing holes in a composite coal seam according to claim 2, wherein the communicating pipe and the extracting pipe are hollow pipes, and through holes are formed in the circumferential direction of the extracting pipe so as to facilitate gas extraction.
4. The method for extracting gas by drilling and sectionally sealing holes in a composite coal seam according to claim 3, wherein a plurality of hole sealing parts are arranged at two ends of the communicating pipe, and the hole sealing parts are arranged at intervals in the extending direction of the communicating pipe.
5. The method for sectionally sealing and extracting gas by drilling holes in a composite coal seam according to claim 4, wherein the radial dimensions of the hole sealing parts are gradually increased along the direction away from the soft layering after grouting is completed.
6. The method for sectionally sealing and extracting gas by drilling holes in a composite coal seam according to claim 3, wherein when grouting is performed on the hole sealing component, the grouting pressure is kept to be 0.8-2.0MPa.
7. The method for extracting gas by drilling and sectionally sealing holes in a composite coal seam according to claim 3, wherein a sleeve is arranged at the inlet of the drilling hole.
8. The method for sectionally sealing and extracting gas from the composite coal seam drilling hole according to claim 6, wherein a hole sealer is arranged on one side of the sleeve away from the drilling hole inlet, and the hole sealer is sleeved on the sleeve.
9. The method for extracting gas by drilling and sectionally sealing holes in a composite coal seam according to claim 1, wherein the number of the hole sealing devices is a plurality of the hole sealing devices, and the hole sealing devices are arranged on the sleeve at intervals.
10. The method for extracting gas by drilling and sectionally sealing holes in a composite coal seam according to claim 1, wherein a plurality of limit clamps are arranged on the communicating pipe, and the limit clamps are fixed on two sides of the hole sealing component along the extending direction of the communicating pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410329990.7A CN118187739A (en) | 2024-03-21 | 2024-03-21 | Composite coal seam drilling and sectional hole sealing process method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410329990.7A CN118187739A (en) | 2024-03-21 | 2024-03-21 | Composite coal seam drilling and sectional hole sealing process method |
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| CN118187739A true CN118187739A (en) | 2024-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410329990.7A Pending CN118187739A (en) | 2024-03-21 | 2024-03-21 | Composite coal seam drilling and sectional hole sealing process method |
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| Country | Link |
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| CN (1) | CN118187739A (en) |
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2024
- 2024-03-21 CN CN202410329990.7A patent/CN118187739A/en active Pending
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