本煤层脉动水力压裂卸压增透技术应用

针对余吾煤业S1206工作面煤层瓦斯含量大、煤层透气性系数低的特点,开展脉动水力压裂试验强化瓦斯抽采,研究了脉动水力压裂卸压增透机理,设计了脉动水力压裂的钻孔参数、封孔工艺和压裂参数。试验结果表明,与普通瓦斯抽采钻孔相比,压裂孔的瓦斯浓度平均提高4.7倍,纯流量平均提高了6.3倍;导向孔的瓦斯抽采浓度平均提高了3.7倍,抽采纯流量平均提高了3.9倍,实现了煤层的快速卸压增透,提高了瓦斯抽采效果。

Practice of in-seam pulsating hydraulic fracturing technology to increase coal seam permeability

Abstract: Aim at the problem of high gas content and low permeability at work face S1206, yuwu coal mine, pulsating hydraulic fracturing experiment was carried out to get a better effect on gas drainage. The principle of pulsating hydraulic fracturing is analyzed, fracturing borehole parameters, borehole sealing process and fracturing parameters are designed. Results indicate that for fracturing boreholes, concentration and flux of extraction gas are boosted by as much as 4.7 times and 6.3 times respectively compared with a normal borehole, for directional boreholes, concentration and flux of extraction gas are increased by 3.7 times and 3.9 times respectively. This technology provides a way of pressure relief and permeability promotion for coal seam.