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水力压裂常应用于高突煤层的卸压增透,但缺乏较好的效果考察手段。介绍了水力压裂过程视电阻率响应原理,建立了水力压裂视电阻率响应现场测试系统,并在新田矿1404底抽巷试验研究了高突煤层水力压裂过程煤体的视电阻率响应。结果表明,压裂孔两侧煤层45 m范围内视电阻率在压裂前后发生明显的变化,且压裂孔对称区域视电阻率的变化存在差异。通过煤层水力压裂视电阻率响应系统可有效地判断水力压裂过程中煤体裂隙场的变动,预测水力压裂范围,为确定水力压裂孔距提供了依据。
Hydraulic fracturing is often applied to the relief of high-level coal seam by permeability, but the lack of a better means of inspection. The principle of apparent resistivity response in hydraulic fracturing process is introduced. A field test system of apparent resistivity response in hydraulic fracturing is established. The apparent resistivity of hydraulic coal in hydraulic fracturing process with high outburst response. The results show that the apparent resistivity of coal seam on both sides of fracturing hole changes obviously before and after fracturing, and the variation of apparent resistivity in the symmetrical area of fracturing holes is different. The apparent resistivity response system of hydraulic fracturing in coal seams can effectively determine the variation of fractured coal field during hydraulic fracturing and predict the hydraulic fracturing range, which provides the basis for determining the hydraulic fracturing distance.