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为研究急倾斜低透气煤层水力压裂后影响区域内的瓦斯及水分富集特征,开展了急倾斜煤层底板水力压裂工业性试验,实测分析了压裂影响区域不同位置处瓦斯含量与水分,得到了瓦斯及水分富集特征。结果表明,水力压裂对瓦斯与水分分布影响明显,急倾斜煤层的大倾角特征直接影响煤层瓦斯与水分的运移与富集;压裂影响区域内瓦斯富集与水分富集特征相反,水分较高区域瓦斯含量较低,而水分较低区域则富集了大量瓦斯;压裂影响区域内上部和下部水分富集较高,而中部由于放水较为充分因而水分较少,但该区域富集瓦斯含量最高;通过对不同区域瓦斯抽采效果分析,压裂孔周围30 m范围内瓦斯抽采效果最佳。
In order to study the characteristics of gas and water accumulation in the area affected by hydraulic fracturing of steeply inclined low permeability coal seam, an industrial experiment on hydraulic fracturing of steep coal seam floors was carried out. The gas content and water content at different positions in the fractured area were measured. Get gas and water enrichment characteristics. The results show that the influence of hydraulic fracturing on gas and water distribution is obvious. The steep dip angle coal seam directly affects the gas migration and enrichment in the coal seam. The gas accumulation in the affected area is opposite to the water accumulation, In the upper area, the gas content is lower, while in the lower water area, a large amount of gas is enriched; in the upper and lower parts of the affected area, the water content is higher, while in the middle area, the water content is lower due to more adequate water discharge. However, Gas content is the highest. By analyzing the effect of gas drainage in different areas, the gas drainage within 30 m around the fracturing hole is the best.