关键词: 钻头, 地层, 各向异性, 井眼轨迹, 预测

Abstract: In the light of the theoretical model of multivariate power product of lateral cutting and the theory of bit-rock interaction,it is shown in the paper how an integrated effect can result from effective actions of the axial and lateral forces of bit taking account of the formation factors and the bit characteristics related to its mechanism of cutting and breaking rocks.Also shown is the calculation model of displacements of borehole resulting from the above effect together with factors such as the well depth increments,the bit rotating speed,the borehole headway direction,the formation drillability,etc.On the basis of theoretical and experimental studies,the application software has been developed.The theoretical achievements and the calculation software have been successfully applied to the lateral section control of horizontal wells in Daqing oilfield.The results showed that the calculation model developed on the basis of integration of the approach of theoretical analysis with mathematical statistical analysis on actual drilling cases is an effective way to predict the lateral sections of horizontal wells.

Key words: drilling bit, formation, amsotropism, borehole trajectory, prediction