CN104963714A - Standing air shaft safe coal-uncovering technology of high gassy mine - Google Patents
Standing air shaft safe coal-uncovering technology of high gassy mine Download PDFInfo
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- CN104963714A CN104963714A CN201510214442.0A CN201510214442A CN104963714A CN 104963714 A CN104963714 A CN 104963714A CN 201510214442 A CN201510214442 A CN 201510214442A CN 104963714 A CN104963714 A CN 104963714A
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Abstract
The invention belongs to the technical field of coal mining and coal-bed gas well radial well construction, and specifically relates to a standing air shaft safe coal-uncovering technology of a high gassy mine. In order to reduce coal seam gas-bearing capacity around an air shaft to the largest extent and improve security and efficiency of air shaft coal-uncovering and tunneling, the invention provides the standing air shaft safe coal-uncovering technology of a high gassy mine. Through constructing one or more vertical coal-bed gas wells near an air shaft, a radial well technology is used. A plurality of branch radial holes are directionally constructed from the coal-bed gas wells to the air shaft direction, and a fracturing technology is supplemented, so that in relatively short time, the coal seam gas-bearing capacity around the air shaft is reduced to the largest extent. Thus, security and efficiency of air shaft coal-uncovering and tunneling are improved.
Description
Technical field
The invention belongs to coal mining and coal bed gas well radial well technical field of construction, be specially a kind of highly gassy mine and found ventilating shaft safe coal-openning technology.
Background technology
Before exposed coal construction, need to carry out forecast assessment to taken off seam gas content, judge that taking off mine is as low gaseous mine or highly gassy mine.And highly gassy mine is carrying out in vertical ventilating shaft process of construction, due to the restriction by construction plant condition, if seam gas content can not be reduced quickly and efficiently before exposed coal, very large potential safety hazard can brought to exposed coal work.So, before exposed coal, how fast and effeciently at utmost to reduce coal seam gas-bearing capacity, safe, the efficient construction of ventilating shaft is had great importance.
Summary of the invention
The present invention, in order to farthest reduce coal seam gas-bearing capacity around ventilating shaft, improves safety and the efficiency of ventilating shaft exposed coal and driving, provides a kind of highly gassy mine and found ventilating shaft safe coal-openning technology.
The present invention adopts following technical scheme:
A kind of highly gassy mine founds ventilating shaft safe coal-openning technology, and be carry out pump drainage to the gas in ventilating shaft before exposed coal, the detailed process of drawing-off gas is as follows:
First around ventilating shaft design attitude, the coal bed gas well that the some mouths of design are vertical is evenly arranged around ventilating shaft center;
Coal seam place again in each coal bed gas well utilizes injection apparatus to spray some radial wells towards the direction of ventilating shaft;
The radial well sprayed is utilized to be aided with the flaw area that fracturing work increase is in the ventilating shaft within the scope of above-mentioned radial well;
Run coal bed gas well, by the gas in ventilating shaft through crack radially well discharge through each coal bed gas well again.
The described quantity being arranged at coal bed gas well around ventilating shaft is no less than four.
Be 100m-150m along the vertical distance of radial direction between described each coal bed gas well and ventilating shaft.
Described injection apparatus comprises surface pipe, production casing, combination tubing and playpipe, and described combination tubing is connected to form successively by some oil pipes, pipe nipple and steering gear, and steering gear is towards ventilating shaft, and playpipe is installed in combination tubing.
The present invention has following beneficial effect:
1, the present invention is by construction a bite or many mouthfuls of vertical coal bed gas wells near ventilating shaft, adopt radial well technology, directed construction multiple branches radial hole from coal bed gas well to ventilating shaft direction, radial well (radial hole) oppose ventilating shaft be surrounding surround shape, mining can be carried out to the gas around ventilating shaft from multi-angle, can farthest reduce coal seam gas-bearing capacity around ventilating shaft, improve the safety of ventilating shaft exposed coal and driving;
2, after coal bed gas well has been constructed, multiple radial well is aided with fracturing technique simultaneously, and within the relatively short time, effectively can reduce the gas density around ventilating shaft, efficiency is higher.
Accompanying drawing explanation
Fig. 1 is the arrangement diagram of coal bed gas well;
Fig. 2 is radial well spray regime figure;
In figure: 1-surface pipe, 2-production casing, 3-oil pipe, 4-playpipe, 5-pipe nipple, 6-coal seam, 7-steering gear, 8-radial well (radial hole branch), 9-coal bed gas well, 10-ventilating shaft.
Detailed description of the invention
It is safety in order to ensure ventilating shaft exposed coal and driving and efficiency that highly gassy mine of the present invention founds ventilating shaft safe coal-openning technology, and need to carry out pump drainage to the gas in ventilating shaft before exposed coal, the detailed process of drawing-off gas is:
First before ventilating shaft 10 is built, according to coal seam gas-bearing capacity size and the length apart from building time, around ventilating shaft design attitude, the vertical coal bed gas well 9 of design four mouthfuls is evenly arranged around ventilating shaft center, when arranging coal bed gas well, be 100m-150m along the vertical distance of radial direction between each coal bed gas well and ventilating shaft, namely the minimum distance between coal bed gas well outward flange and ventilating shaft outward flange, as shown in Figure 1.Wherein the quantity of coal bed gas well should not be less than four, otherwise cannot ensure that the corresponding radial well (radial hole branch) sprayed can cover the periphery of ventilating shaft, is unfavorable for the mining to gas around ventilating shaft.
Coal seam 6 place again in each coal bed gas well utilizes injection apparatus to spray some radial wells 8 towards the direction of ventilating shaft, the dense degree of radial well affects the Size of Crack of ventilating shaft, and (radial well is more intensive, the crack of ventilating shaft is larger, is more conducive to the pump drainage to gas in well).Wherein adopted injection apparatus comprises surface pipe 1, production casing 2, combination tubing and playpipe 4, described combination tubing is connected to form successively by some oil pipes 3, pipe nipple 5 and steering gear 7, the installation direction of steering gear should towards ventilating shaft, and playpipe is installed in combination tubing.The length of combination tubing is determined by the coal seam degree of depth, and steering gear is arranged at depth location place, coal seam and towards ventilating shaft, also should bends to reach jeting effect with the direction of combination tubing when playpipe is installed.
After radial well construction terminates, utilize the radial well sprayed to be aided with fracturing work, increase the flaw area of the ventilating shaft be within the scope of above-mentioned radial well to the full extent, to improve the coal reservoir fracture system of this coal seam section; Finally run coal bed gas well, by the gas in ventilating shaft through crack radially well discharge through each coal bed gas well again, coal seam reservoirs gas bearing capacity is reduced until the gas density in ventilating shaft meets relevant mine exposed coal standard by mining, for follow-up ventilating shaft driving exposed coal creates safe operating condition, improve ventilating shaft construction efficiency.
Claims (4)
1. highly gassy mine founds a ventilating shaft safe coal-openning technology, it is characterized in that carrying out pump drainage to the gas in ventilating shaft (10) before exposed coal, and the detailed process of drawing-off gas is as follows:
First around ventilating shaft design attitude, the coal bed gas well (9) that the some mouths of design are vertical is evenly arranged around ventilating shaft (10) center;
Coal seam (6) place again in each coal bed gas well (9) utilizes injection apparatus to spray some radial wells (8) towards the direction of ventilating shaft (10);
The radial well (8) sprayed is utilized to be aided with the flaw area that fracturing work increase is in the ventilating shaft (10) within the scope of above-mentioned radial well;
Run coal bed gas well, by the gas in ventilating shaft (10) through crack radially well discharge through each coal bed gas well (9) again.
2. highly gassy mine according to claim 1 founds ventilating shaft safe coal-openning technology, it is characterized in that: described in be arranged at ventilating shaft (10) coal bed gas well (9) around quantity be no less than four.
3. highly gassy mine according to claim 2 founds ventilating shaft safe coal-openning technology, it is characterized in that: the vertical distance along radial direction between described each coal bed gas well (9) and ventilating shaft (10) is 100m-150m.
4. highly gassy mine according to claim 1 founds ventilating shaft safe coal-openning technology, it is characterized in that: described injection apparatus comprises surface pipe (1), production casing (2), combination tubing and playpipe (4), described combination tubing is connected to form successively by some oil pipes (3), pipe nipple (5) and steering gear (7), steering gear (7) is towards ventilating shaft (10), and playpipe (4) is installed in combination tubing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510214442.0A CN104963714A (en) | 2015-04-30 | 2015-04-30 | Standing air shaft safe coal-uncovering technology of high gassy mine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510214442.0A CN104963714A (en) | 2015-04-30 | 2015-04-30 | Standing air shaft safe coal-uncovering technology of high gassy mine |
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| CN104963714A true CN104963714A (en) | 2015-10-07 |
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Cited By (3)
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| CN109209325A (en) * | 2018-09-28 | 2019-01-15 | 山西晋城无烟煤矿业集团有限责任公司 | A method of uncovering coal in vertical shaft is carried out using radial technology |
| CN112127864A (en) * | 2020-09-23 | 2020-12-25 | 中煤科工集团重庆研究院有限公司 | Multi-coal-seam segmented hydraulic fracturing method for vertical shaft coal uncovering area |
| CN114233369A (en) * | 2021-12-28 | 2022-03-25 | 山西晋煤集团技术研究院有限责任公司 | Method for accurately eliminating coal and gas outburst by combining up and down of well |
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| CN109209325A (en) * | 2018-09-28 | 2019-01-15 | 山西晋城无烟煤矿业集团有限责任公司 | A method of uncovering coal in vertical shaft is carried out using radial technology |
| CN112127864A (en) * | 2020-09-23 | 2020-12-25 | 中煤科工集团重庆研究院有限公司 | Multi-coal-seam segmented hydraulic fracturing method for vertical shaft coal uncovering area |
| CN112127864B (en) * | 2020-09-23 | 2022-03-29 | 中煤科工集团重庆研究院有限公司 | Multi-coal-seam segmented hydraulic fracturing method for vertical shaft coal uncovering area |
| CN114233369A (en) * | 2021-12-28 | 2022-03-25 | 山西晋煤集团技术研究院有限责任公司 | Method for accurately eliminating coal and gas outburst by combining up and down of well |
| CN114233369B (en) * | 2021-12-28 | 2023-10-31 | 山西晋煤集团技术研究院有限责任公司 | Method for precisely eliminating coal and gas outburst by up-and-down combination |
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Application publication date: 20151007 |
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