Evaluation method suitable for underground coal mine gas extraction drilled hole sealing quality detection

Abstract

The invention discloses an evaluation method suitable for underground coal mine gas extraction drilled hole drilling sealing quality detection, and relates to the field of mining industry evaluation.The evaluation method comprises the following steps that S1, the grading standards of different types drilled hole evaluation items are determined; S2, the influence weight of the different evaluationitems on hole sealing quality is calculated; S3, the hole sealing quality of drilled holes to be evaluated is evaluated according to the actual measurement condition; and S4, the drilled holes are classified according to the evaluation result. Therefore, the drilled hole utilization quality is improved specifically, and the index scientificity, comprehensiveness and operability are improved.

Description

technical field [0001] The invention relates to an evaluation method suitable for the quality detection of borehole sealing in underground gas drainage in coal mines, and mainly relates to the field of mining quality evaluation. Background technique [0002] In the field of coal mine gas control, drainage measures represented by through-bedding drilling and bedding drilling are widely used underground in coal mines. As the source of underground gas control in coal mines, these drillings directly affect the efficiency of gas control and the safety of the drainage system. . Underground coal mine drilling is often arranged in coal seams or rock formations, with a length ranging from tens of meters to thousands of meters. The cost of drilling construction is huge. Construction costs, more importantly, affect the efficiency of gas control, and indirectly affect the succession of coal mine drainage. At present, most mines use single-hole drainage concentration as the only standa...

AI Technical Summary

Problems solved by technology

Underground coal mine drilling is often arranged in coal seams or rock formations, with a length ranging from tens of meters to thousands of meters. The cost of drilling construction is huge. The construction cost, more importantly, affects the efficiency of gas control, and indirectly affects the succession of coal mine extraction and mining.

At present, most mines use single-hole drainage concentration as the only standard for evaluating the quality of sealing holes. The main technical shortcomings include: first, the classification level is single and not clear enough. Generally, it is only divided into good or bad drainage effects based on a certain concentration value; second, Drainage concentration is only one of the standards to reflect the quality of sealing holes. In fact, when drilling open-source drainage (high-level holes) or coal seams with poor air permeability and unsatisfactory desorption effect, the single-hole drainage concentration is often unsatisfactory.

Due to the different types of boreholes (there are bed-crossing boreholes and bedding-aligned boreholes) and different drainage sources (there are differences in coal seam characteristics and gas enrichment), the drainage concentration as an evaluation index cannot truly reflect the quality of borehole sealing, and it is urgently needed A scientific, comprehensive and operable method for evaluating the quality of drilling and sealing

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