钻具组合造斜率预测方法

Method for Predicting the Rate or Deviation Change of BHA

根据井底最近测点数据，计算井底轨迹参数。利用下部钻具力学计算模型进行钻头力学计算。引入钻头各向异性指数和地层各向异性指数后，建立三维钻速方程，依此预测计算钻具组合的造斜率。并将该方法编制成计算机软件。实例计算表明，这种方法比较可靠。

In the article,through the application of downhole projection technology, BHA mechanics model and bitrock interaction model,under the comprehensive consideration of BHA structure,wellbore geometric shape,downhole measured data,drilling parameters and formation characters,a method for predicting the rate of deviaton change of BHA before it running into hole is presented.The field application shows that this method is reliable,and is of some guidance significance for the BHA selection and wellbore trajectory control of both directional and horizental drilling.