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潜孔钻头结构参数与井底流场关系研究
引用本文:单代伟,黄志强,李琴,杨茂君,刘少彬.潜孔钻头结构参数与井底流场关系研究[J].天然气工业,2007,27(2):73-76.
作者姓名:单代伟  黄志强  李琴  杨茂君  刘少彬
作者单位:1.西南石油大学机电工程学院;2.中国石油东方地球物理公司物资设备部
基金项目:中国石油天然气集团公司资助项目
摘    要:在勘探钻井过程中,QF-Ⅱ型潜孔钻头井底流场分布不合理,存在排屑能力差,对井壁冲蚀破坏严重等缺点,制约了该潜孔钻头在现场的应用。为此,以QF-Ⅱ型潜孔钻头为原型,充分考虑了钻头排屑槽和切削齿对井底流场的影响,建立了与实际相接近的潜孔钻头井底流场物理模型。在计算流体力学软件Fluent中将CAD模型转换为相应的CFD井底流场模型,运用k-ε两方程模型,对钻头喷嘴不同位置、不同直径、不同倾角时的井底流场进行了数值模拟研究。这些结构参数直接影响井底流场分布及流体的排屑能力,在研究中把这些参数作为钻头结构优化设计的重点,找到了钻头喷嘴不同结构参数条件下对井底流场的影响机理,为合理进行潜孔钻头的结构设计及水力设计提供了依据和校验方法。

关 键 词:潜孔钻头  数值模拟  射流  流场  喷嘴  研究
修稿时间:2006-08-07

STUDY ON RELATIONSHIP BETWEEN STRUCTURAL PARAMETERS OF DTH BITS AND FLOW FIELD AT HOLE BOTTOM
SHAN Dai-wei,HUANG Zhi-qiang,LI Qin,YANG Mao-jun,LIU Shao-bin.STUDY ON RELATIONSHIP BETWEEN STRUCTURAL PARAMETERS OF DTH BITS AND FLOW FIELD AT HOLE BOTTOM[J].Natural Gas Industry,2007,27(2):73-76.
Authors:SHAN Dai-wei  HUANG Zhi-qiang  LI Qin  YANG Mao-jun  LIU Shao-bin
Affiliation:1.Mechanical and Electrical Engineering College of Southwest Petroleum University;2.Material and Equipment Department, BGP Inc.,CNPC
Abstract:During exploratory drilling, the QF ⅡDTH bit has disadvantage of unreasonable flow field distribution at the well bottom, which will cause poor cuttings removal and serious wellbore erosion, limiting the field application of DTH bits. In this paper, based on the original QF ⅡDTH bit, taking into consideration the effects of junk slots and cutters on the flow field at the well bottom, the physical model of the hole bottom flow field of DTH bit is established. Through converting the CAD model into CFD model by use of the hydrodynamics software FLUENT, the hole bottom flow field is simulated by using κ ε  two equation model, with bit nozzles at different locations, with different diameters and different angles. All these parameters will directly affect the distribution pattern of hole bottom flow field and the cuttings carrying capability of drilling fluid. During the study, these parameters are regarded as the key concerns of optimum structural design, and the mechanism of how the parameters of nozzle affect the hole bottom flow filed is found out, it will offer reasonable foundations and checking methods for structural design and hydraulic design of DTH bits.
Keywords:down-the-hole(DTH) bit  numerical simulation  jet  flow field  nozzle  study
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