摘要
利用定向水力压裂方法对煤层卸压,从而防治矿井冲击地压。同时采用KBD5电磁辐射监测仪对试验结果进行了监测。结果表明：实施定向水力压裂后,压裂孔周围10~20 m内电磁辐射值较压裂前明显下降,出现了一个应力降低区,地应力较压裂前有所减小;压裂孔径向大于15 m外范围出现一个应力升高区,说明压裂孔周围煤体应力向外发生了移动。在煤体降低压区内,钻孔施工顺利,孔深100 m以上都无异常,而在两侧的应力升高区,当钻孔打到24~30 m处出现严重喷孔现象。
The seam pressure releasing with the directional hydraulic fracturing could prevent and control the mine pressure bumping occurred.Meanwhile the KBD5 electromagnetic radiation monitoring and measuring instrument was applied to monitor and measure the experiment results.The results showed that after the directional hydraulic fracturing conducted,the electromagnetic radiation value within 10~20 m around the fractured borehole was significantly reduced than before the fracturing operation completed.There was a stress reduced zone occurred and the ground stress was lower than before the fracturing operation completed.There was a stress increased zone occurred in a zone beyond the fractured borehole radial over 15 m.Thus the seam stress around the fracturing borehole had a migration to outward.Within the pressure reduced zone of the seam,the drilling operation could be conducted smoothly and there was no abnormal occurred when the drilling depth was over 100 m.But within the stress increasing zone along the two sides,there would be serious coal and gas jettings from the borehole occurred when the drilling operation reached at 24~30 m.
出处
《煤炭科学技术》
CAS
北大核心
2011年第6期12-14,74,共4页
Coal Science and Technology
关键词
煤矿
定向水力压裂
冲击地压
卸压
coal mine
directional hydraulic fracturing
mine pressure bumping
pressure releasing
