松软低透气性煤层跟管钻进及压裂抽采技术研究分析

Research and Analysis on Drilling-while-casing and Fracturing Drainage in Soft and Low Permeability Coal Seams

针对我国松软低透气性煤层瓦斯抽采难题,提出了采用跟管钻进和水力压裂技术提高松软煤层钻孔深度和煤层透气性,通过布孔设计、应力分析论证了该方法的施工可行性,讨论了该方法的施工步骤。该技术有望成为解决松软低透气性煤层瓦斯抽采难题的新工艺方法。

In order to improve the drilling depth and the permeability of soft and low permeability coal seams,a new technique including underground casing-while-drilling and horizontal hydraulic fracturing is proposed. The paper discusses the feasibility and execution steps of this technology based on the borehole design and stress analysis. It is possible that this technique becomes a new technology to solve the gas drainage difficulties in soft and low permeability coal seams.