水力压裂后瓦斯抽采孔温度监测及应用

Temperature Monitoring of Gas Extraction Hole After Hydraulic Fracturing and Its Application

为评价水力压裂的压裂效果,利用钻屑温度法对水力压裂后瓦斯抽采孔温度进行了监测。通过分析监测数据得到以下规律与结论:如果实测钻孔温度稳定下降,并逐渐趋于稳定,表明卸压效果较好,动力灾害危险性解除;如果实测钻孔温度与风巷煤壁温度差值较大,表明钻孔处于煤体应力(瓦斯压力)升高区,具有潜在动力灾害危险性。

To evaluate the fracturing effect of hydraulic fracturing,temperature of gas extraction hole was monitored using the method of drilling cuttings temperature after hydraulic fracturing. The following conclusions were drawn by analyzing monitoring data：if the meas- ured borehole temperature falls steadily,it indicates that pressure relief effect is good and dynamic hazard has lifted;it indicates that borehole is at the increasing zones of coal stress （ gas stress） and has potential dynamic hazard if the difference between the measured borehole temperature and the return airway wall temperature is comparatively large.