关键词: 钻头, 各向异性, 定向钻井, 井眼, 轨迹预测, 三维模型

Abstract: In this paper a comprehensive 3-dimensional analysis for rock-bit interaction is made and relevant models, which account for the anisotropic drilling characteristics of both the formationand the bit, are derived. Combined with the BHA analysis,the models are used to realize the prediction of drilling trajectory and to back-calculate the related coefficients from the well history information. Ten groups of coefficients for ten strata and three kinds of bits are obtained by means of back calculation of the actual drilling data of four wells in central Daqing.The drilling trajectory for four sections of two holes, in this area are predicted.The predicted results give an average error for deviation angle is 0.162(°/100m)and an average error for azimuth angle is 0.988(°/100m).