低渗煤层顺层钻孔塌堵孔修复增透技术研究

发布时间：2018-11-04 13:55

【摘要】：为实现顺层瓦斯抽采钻孔塌堵孔有效再利用,从空间、时间2个层面分析得出:抽采过程中钻孔周围煤体塑性区、煤体流变性及抽采负压对钻孔塌堵孔影响较为严重。借鉴穿层钻孔塌堵孔修复技术,以水射流为动力,以冲开塌堵孔段、击落塑性区煤体、冲出孔内破落煤体为目的,制定顺层钻孔塌堵孔修复增透技术;现场试验表明:顺层钻孔修复增透后,瓦斯抽采效果改善明显,抽采浓度平均升高1.4~5.0倍,抽采混合流量平均升高1.2~3.5倍;纯瓦斯抽采流量平均升高1.2~10.0倍;顺层钻孔塌堵孔修复增透技术除受修复增透工艺影响,还受钻孔倾角、封孔等影响。
[Abstract]:In order to realize the effective reuse of borehole caving and plugging, it is concluded from space and time that the rheological properties of coal and the negative pressure of drainage have serious influence on the hole collapse and plugging in the coal body plastic zone around the borehole during the extraction process. For reference to the repairing technology of hole collapse and plugging in perforated boreholes, taking water jet as the power, aiming at breaking down the coal body in plastic zone and breaking out of the hole, the anti-reflection technology is established for repairing hole caving and plugging hole in the same layer in order to break down the coal body in plastic zone and break out the hole in the hole. The field test shows that the gas drainage effect is improved obviously after repairing and improving the permeability of the bedding borehole, the average extraction concentration is increased by 1.45.0 times, and the drainage mixed flow rate is increased by 1.2U / 3.5 times on average. The flow rate of pure gas drainage was increased by 1.2 ~ 10.0 times on average, and the antireflection technique was affected not only by repairing antireflection technology, but also by borehole inclination and hole sealing.
【作者单位】：山西大同大学教学实验与实训中心;河南理工大学能源科学与工程学院;中原经济区煤层(页岩)气河南省协同创新中心;河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地;山西大同大学煤炭工程学院;
【基金】：国家自然科学基金资助项目(51404093) 山西大同大学青年基金资助项目(2016Q12)
【分类号】：TD712.6

【相似文献】