Method for selecting high-level gas drainage horizon in coal mine
A coal mine gas and gas drainage technology, which is applied in gas discharge, mining equipment, earth-moving drilling, etc., can solve problems such as low efficiency, and achieve the effects of reducing impact, improving economic efficiency, and increasing hole layout accuracy.
Active Publication Date: 2013-08-28
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology
[0006] Compared with the prior art, the present invention can improve the current situation of blind hole layout and low efficiency for high-level gas drainage, increase the precision of hole layout, and improve the drilling hole formation rate; it is beneficial to coal seam gas drainage, and reduces the need for mine ventilation. Systemic impact; reduced extraction costs, improved economic efficiency
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Embodiment Construction
[0007] The present invention will be described in detail below.
[0008] The present invention is realized through the following steps:
[0009] Step 1: According to the downhole conditions, design the location, parameters and quantity of the detection borehole. The main consideration is to select a suitable location for the construction and detection of the borehole according to the downhole conditions. Generally, the mined-out area about 6 months after the end of mining is selected as the detection At the same time, it is necessary to ensure that the original water permeability of the coal seam top shift and the overlying strata that have not been affected by mining can be detected in the same borehole, and that there is enough time to complete the drilling construction and detection tasks, and that there is enough time to complete the detection tasks. The required drilling rig, electricity, water pressure and space; according to the location of the drilling hole, the perfor...
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The invention relates to a method for selecting a high-level gas drainage horizon in a coal mine. When the horizon of a drainage borehole is too high, the mining-induced fracture does not develop, the drainage is difficult to operate and the efficiency is low; when the horizon is too low, the air leakage on a working face occurs easily, the operation of a ventilation system of the mine is affected, the stability of a rock formation is poor, the borehole is difficult to maintain and the drainage efficiency is difficult to ensure. The method comprises the following steps: designing the positions, the parameters and the number of detection boreholes according to underground conditions, then constructing a pre-drainage contrast hole and the detection holes, immediately performing water-leakage detection after completing the construction, recording detection data, further performing preliminary analysis on the detection data, standardizing the detection data by taking the vertical height as the standard, contrasting the data of the pre-drainage contrast hole and the detection holes, measuring the development degree of the mining-induced fracture according to the changing degree of water leakage quantity and determining the optimal gas drainage horizon according to the rock character of the positions. By adopting the method, the hole arrangement precision is increased and the hole-forming rate of the boreholes is improved; the gas drainage of a coal seam is benefited and the impacts on the ventilation system of the mine are reduced; and the drainage cost is reduced and the economic efficiency is improved.
Description
technical field [0001] The invention relates to a gas safety control technology, in particular to a method for selecting layers for high-level gas drainage in coal mines by using the technology of segmental water injection in boreholes and leakage detection. technical background [0002] Coal mine gas is one of the major disasters in coal mines, and gas drainage is the fundamental measure to solve the coal mine gas disaster. Since the state promulgated the coal mine gas control policy, the gas drainage technology has been developing day by day. In particular, the use of horizontal long boreholes in roof strata to drain gas from adjacent layers and goafs is an economically feasible new technology that has played a positive role in alleviating the pressure of coal seam gas control, improving gas drainage efficiency, and reducing excessive gas content. effect. At present, the problem that seriously restricts the large-scale promotion of this technology is the reasonable hole ...
Claims
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IPC IPC(8): E21F7/00
Inventor 韩保山王战锋
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP