A method for fast excavation by injecting high temperature nitrogen gas through layer drilling
A layer-penetrating drilling and nitrogen gas technology, applied in earthwork drilling, wellbore/well components, mining equipment, etc., can solve problems affecting coal mine safety and efficiency, slow roadway excavation speed, low coal seam permeability, etc., to achieve roadway The excavation speed is safe, the roadway excavation speed is fast, and the effect is good
Active Publication Date: 2019-11-22
XUZHOU UNIV OF TECH
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Problems solved by technology
However, due to the low gas permeability of the coal seam, there are problems in the subsequent gas drainage process after conventional drilling through the seam: the extraction range is small, the extraction time is long, and the extraction is difficult. Since the gas concentration in the roadway cannot be reduced in time, the coal seam The driving speed of the roadway in the working face is slow, which causes the imbalance of coal mine excavation and seriously affects the safety and efficiency of the coal mine
Method used
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[0019] The present invention will be further described below.
[0020] Such as figure 1 with figure 2 Shown, concrete steps of the present invention are:
[0021] A. Construct a group of linearly distributed bed-through drilling holes in the direction of the coal seam at intervals of 3 to 4m in the low-level drainage roadway to ensure that each group of bed-through drilling holes penetrates the coal seam and enters the coal seam roof for no less than 0.5m. The bed-through drilling is within the control range of roadway excavation; the control range of said roadway excavation is specifically: at least 20m outside the contour line of the upper side of the roadway in inclined and sharply inclined coal seam 1, at least 10m outside the lower side of the roadway, and at least 10m outside the contour line on both sides of the roadway for others. 15m each; the number of each group of piercing boreholes is an odd number, and each group of piercing boreholes in the middle is a first-...
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The invention discloses a fast tunneling method for injecting high-temperature nitrogen through drilled holes in strata. A mode of drilling the strata by groups and then injecting high-temperature nitrogen into the drilled holes in the strata step by step is adopted, and by means of the drilled holes in the strata of an extraction roadway at a low position, high-temperature nitrogen is repeatedlyinjected step by step; not only are coals among the drilled holes in the strata heated by the energy of high-temperature nitrogen to accelerate gas desorption, but also fracture permeability improvement of high-temperature nitrogen is achieved in different directions at different times. Increase, expansion and ventilation of cracks in the coals can be accelerated; additionally, cracking and ventilation improvement of the coals are facilitated under the coupling effect of temperature and pressure. By repeatedly injecting high-temperature nitrogen step by step, the problems of crack closure andreduction of gas density and flow during extraction are avoided, extraction of gas with high concentration and high flow by means of the drilled holes in the strata is ensured, the coals and the gas within a control range of a coal layer tunneling roadway are efficiently, safely and quickly extracted, and the speed of tunneling a single soft coal layer roadway with high emergent risks is increasedgreatly.
Description
technical field [0001] The invention relates to a method for rapid excavation, in particular to a method for rapid excavation by injecting high-temperature nitrogen into drilling through layers. Background technique [0002] Under the current regulations of coal mines, the excavation work in outburst mines should be done without digging outbursts or mining overhangs. Mining activities are strictly prohibited if comprehensive regional outburst prevention measures are not taken as required. In order to ensure the safety of a single low-permeability coal seam with a high risk of outburst under the mining condition of no protective layer during the roadway excavation process, many coal mines in the industry often choose no outburst risk in the range of 10-20m vertically below the coal seam excavation roadway. A low-level drainage roadway parallel to the excavation roadway is arranged in the rock formation. In the low-level drainage roadway, drill through-bed drilling holes to ...
Claims
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IPC IPC(8): E21F7/00E21B43/26E21B43/24E21B43/16
CPCE21B43/168E21B43/2405E21B43/26E21F7/00
Inventor 王圣程姜慧禄利刚殷惠光张朕
Owner XUZHOU UNIV OF TECH