三牙轮钻头井底漫流速度计算探讨

STUDY ABOUT THE CROSS-FLOW SPEED CALCULATION FOR TRICONE BIT IN BOTTOM

在喷射钻井过程中 ,井底漫流速度是清除井底岩屑、净化井底的主动力。应用流体力学的基本原理 ,在垂直单喷嘴射流井底平面的点源散射物理模型 ,以及倾斜单喷嘴射流井底平面的源—汇叠加物理模型的基础上 ,对三牙轮钻头的三倾斜组合射流的井底平面漫流场建立了源—源叠加的物理模型 ,从而推导出了数学计算式。计算式中几乎包括了三牙轮钻头所有与井底漫流场有关的设计和应用计算参数。通过编制的计算机软件的计算结果表明 ,井底平面漫流速度和分布与实际和实验结果吻合。

The cross flow speed in bottom is the main factor to dispose of rock fragment and clean well-bore bottom. This paper established the well - bore bottom plane source - source superposition physical model for cross-flow field of triclinic combination jet flow of tricone bit. Based on hydromechanical basic principles, point - source scattering physical model in well - bore bottom plane with vertical single nozzle jet, and source - convergence superposition physical model in well - bore bottom plane incline single nozzle jet, mathematical model was drawn . It includes almost all design about tricone bit having truck with cross flow field in well bore bottom plane. The calculated results of the cross flow speed and distribution in well - bore bottom plane coincide with field and experiment results, the paper also provides a theoretical support for design of the tricone bit and the hydraulic parameters.