The invention relates to a
coal mine underground gas extraction
drill hole failure judgment method, and belongs to the technical field of
coal mine gas extraction. The method comprises the following steps: S11, constructing a borehole gas extraction prediction model by comprehensively controlling
coal seam gas parameters, coal and rock stratum environment conditions, extraction borehole parameters, a gas circulation theory and the like of a region; S12, comparing the drilling
monitoring data with the prediction
simulation result, and judging the drilling operation state; S13, determining a failure
drill hole according to the judgment result, and determining a
drill hole
failure type by utilizing a failure
drill hole judgment method; S14, performing drilling repair, coal seam permeability improvement and other technical measures or adjusting extraction
drilling engineering parameters according to the drilling
failure type, and guiding the drilling extraction of the next area. Accordingto the method, a basis is provided for carrying out technical measures such as failure drilling repair in a targeted mode, the extraction drilling utilization efficiency and the fine management technical level are effectively improved, and it is guaranteed that the coal mine gas extraction effect is smoothly connected with mine extraction.