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COMPARISON OF FRACTURING TECHNOLOGIES IN COALBED METHANE WELLS 
ZHANG Yongcheng, BAI Yunyun, LIU Liangliang, et al
Resources & Industries    2018, 20 (4): 36-41.   DOI: 10.13776/j.cnki.resourcesindustries.20180727.011
Abstract380)      PDF(pc) (4524KB)(165)       Save
Poor connectivity and low permeability of coal fissure system need to be modified by using fracturing technology to increase the production. This paper, based on a case study of CBM wells fracturing technologies of Jincheng anthracite mining group, analyzes the pros and cons of hydraulic fracturing, nitrogen shock fracturing, high-energy gas fracturing and plasma pulse fracturing, compares their improved effects, aiming at offering references for selection of fracturing technologies and research direction. Active hydraulic fracturing is the chief means in raising the CBM production, but needs improvement in loose low-permeability and deep coal seams. Adaptability of gel and clean fracturing fluids to variable CBM reservoirs need further studies, and cost shall be lowered. Nitrogen shock fracturing is currently in tentative stage, which requires further research study in fracturing mechanism and technical adaptability. High-energy gas fracturing is not working well in deep coal seam and thin-bedded reservoirs, needing a technical milestone. Plasma pulse fracturing works well in old wells with excellent effect and should be used widely. 
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