复杂轨迹穿越回拖力计算分析

Caltational analysis of drag force

回拖力计算是水平定向钻穿越施工的重点,计算方法也有多种,且差异较大。在回拖力计算中,会经常出现计算方法、计算参数选择问题,特别是大高差、多曲线段等轨迹复杂的情况下可能出现大的计算误差。基于此,针对回拖力影响因素进行分析,介绍了典型回拖力计算方法及使用条件,修正了绞盘力计算公式,提出了复杂轨迹回拖力计算方法并进行实例验证,建议回拖前根据工况再次对回拖力进行核算。

Back drag force calculation is the focus of horizontal directional drilling through construction,and there are many calculation methods,and the difference is large.In the calculation of drag force,the selection of calculation methods and calculation parameters often appears,especially the large calculation error may occur in the case of complex trajectory of large height difference and multiple curve segments.This paper analyzes the influencing factors of the drag force,introduces the typical calculation method and use conditions of the drag force,corrects the calculation formula of the capstan force,proposes the calculation method of the complex trajectory and verifies the drag force again according to the working condition before dragging.