流体机械Issue(5)：25-30,6.DOI:10.3969/j.issn.1005-0329.2014.05.006
径向水平井自进式旋转射流钻头流场特性分析
Flow Field Study on Self-propelled Conical Jet Bit for Radial Horizontal Drilling
摘要
Abstract
A novel self-propelled conical jet bit was designed to settle the problem of rock breaking efficiency and self-propelled ability.The 3D flow characteristics of flow fields inside and outside the designed jet bit were analyzed based on numerical method and RNG k-εturbulent model.Furthermore,the influence of the jet bit structural parameters on flow field characteristics of the jet nozzle was investigated for optimizing the novel jet bit.The experimental results show that the maximum axial velocity of flow field outside the nozzle is on the centerline of the nozzle and the axial velocity rapidly drops with the increase of radial radius.The tangential velocity along the nozzle radial shows classical “N”pattern distribution,which is beneficial for producing larger rock breaking area and depth.The radial velocity exhibits axial-symmetric distribution and has an obvious cross flow layer in favor of cleaning the cuttings.The number of guide vane and the screw pitch of the oriented impeller for the jet bit have a significant in-fluence on jet velocity.In addition,the nozzle diameter has great effect on flow field characteristics of the jet flow.After optimi-zation,the value of the screw pitch is 16mm,the number of guide vane is 2 and the nozzle diameter is 1mm.关键词
径向水平井/自进式旋转射流钻头/导向叶轮/流场特性Key words
radial horizontal well/self-propelled conicaljetbit/oriented lmpeller/flow field characteristics分类
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毕刚,李根生,沈忠厚,黄中伟,李浩..径向水平井自进式旋转射流钻头流场特性分析[J].流体机械,2014,(5):25-30,6.基金项目
国家973项目“深井复杂地层安全高效钻井基础研究”（2010CB226700）；国家科技重大专项“煤层气水平井、多分支水平井钻井技术研究” （）
