煤矿井下定向钻孔轨迹预测方法研究

Forecasting Method of Directional Borehole Trajectory in Coal Mine Underground

针对传统钻孔轨迹预测方法中三点定圆法未考虑钻具受力变形、纵横弯曲梁法相关参数难以获取的问题,提出了一种运用纵横弯曲梁理论对三点定圆法进行改进的煤矿定向钻孔轨迹预测新方法。该方法根据纵横弯曲梁理论对单弯螺杆钻具组合进行受力分析,导出三弯矩方程,求取钻具组合弯曲变形后形成的第二跨跨长L_2,代入三点定圆法中,计算得出钻具组合在不同受力条件下的预测造斜率,实现煤矿近水平千米定向钻孔的轨迹预测。运用晋煤赵庄矿千米钻机钻孔轨迹数据对模型进行了验证,验证结果表明,该方法的预测精度达到施工要求并高于传统的纵横弯曲梁法。

To the problems of drilling tool deformation and parameters of vertical and horizontal bending theory were hard to obtained,which were not considered in three points circle location method for traditional borehole trajectory forecasting method,a new method of directional borehole trajectory forecasting that based on improved three points circle location method with vertical and horizontal bending theory was put forward.Force analysis for single bent screw drill assembly was proceed by vertical and horizontal bending theory,and then three moment equation was derived out,the second span length L 2 after drilling tool deformation was obtained,and then it was generation into the three points circle location method,forecasting build-up rate under different stress of drilling tool were calculated,and then trajectory forecast of nearly horizontal kilometer directional drilling was realized.And the results were verified in Zhaozhuang coal mine of Jin coal gro up,the results showed that the precision exceed the traditional method of vertical and horizontal bending theory.