摘要
采用计算流体力学软件CFdesign对两种不同结构的钻头,分别进行了水力学性能模拟研究。结果表明,钻头水路结构设计不合理,容易引起下列现象:(1)钻头局部位置受流体冲刷作用强烈;(2)形成井底钻井液的逆向流动和涡流;(3)造成井底流场负压,可能引起气蚀现象;(4)流场流速矢量方向发散,加剧漫流现象。模拟分析的结果表明圆弧型钻头较平底型钻头结构设计更加合理。
The software CFdesign was used for the analysis on flow field simulation of two different kinds of drilling bit.The results showed that,if the waterway design of drilling bit was unreasonable,it could result in the following phenomena： the drilling bit could get eroded locally by the drilling fluid;the return of flow and eddy currents of drilling fluid could occur at the bottom of drilling well;negative pressure could be detected and might result in cavitation corrosion;the direction vector of flow field were diffused and resulted in cross flowing.The simulation results indicated that waterway structure of arc-bottom bit was more reasonable compared with that of flat-bottom bit.
出处
《金刚石与磨料磨具工程》
CAS
北大核心
2011年第6期43-46,50,共5页
Diamond & Abrasives Engineering
关键词
金刚石钻头
唇面结构
水力性能
流场模拟
diamond drilling bit
crown
hydraulic performance
flow field simulation
