Analysis on the multi-phase flow characterization in cross-measure borehole during coal hydraulic slotting

查看全文 作　　者：Chunshan [1]Zheng;Baiquan [2]Lin;Mehmet [1]S.Kizil;Saiied [1]M.Aminossadati;He [2]Li;Zhongwei [1]Chen

机构地区：[1]School of Mechanical and Mining Engineering, The University of Queensland;[2]School of Safety Engineering, China University of Mining & Technology

出　　处：《International Journal of Mining Science and Technology》索引2018年第28卷第4期,共5页

基　　金：financially supported by the CSC-UQ Scholarship 摘　　要：Hydraulic slotting in a gas drainage borehole is an effective method of enhancing gas drainage performance. However, it frequently occurs that a large amount of slotting products(mainly the coal slurry and gas) intensely spurt out of the borehole during the slotting, which adversely affects the slotting efficiency. Despite extensive previous investigations on the mechanism and prevention-device design of the spurt during ordinary borehole drilling, a very few studies has focused on the spurt in the slotting process. The slotting spurt is mainly caused by two reasons: the coal and gas outburst in the borehole and the borehole deslagging blockage. This paper focuses on the second reason, and investigates the hydraulic deslagging flow patterns in the annular space between the drill pipe and borehole wall.Results show that there are six deslagging flow patterns when the drill pipe is still: pure slurry flow, pure gas flow, bubble flow, intermittent flow, layering flow and annular flow. When the drill pipe rotates, each of those six flow patterns changes due to the Taylor vortex effect. Outcomes of this study could help to better understand the slotting-spurt mechanism and provide guidance on the anti-spurt strategies through eliminating the borehole deslagging blockage. 关键词：流动模式地上煤气水力多相职业人员煤泥浆喷射

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Analysis on the multi-phase flow characterization in cross-measure borehole during coal hydraulic slotting

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引证文献(3)

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