大位移井钻进时普遍存在岩屑床，岩屑运移效果与钻柱受力状态相互影响和制约。传统研究将岩屑运移分析和管柱受力分析相互分隔，独立研究。本项目针对大位移井钻进过程中井眼清洗难、钻柱摩阻大、钻头加压困难、卡钻事故率高、滑动钻进困难等工程难题，围绕动态岩屑运移与钻柱受力相互作用这一关键点，通过开展动态岩屑运移与钻柱受力耦合的室内模拟实验和理论分析研究，探索在大位移井中不同井斜区间段钻进时岩屑分布和钻柱受力的变化规律；分析井眼中沉积的岩屑对钻柱受力的影响；建立动态岩屑运移与钻柱力学耦合的系统计算模型；分析大位移井钻进过程中，岩屑床分布与钻柱扭矩、轴向力、钻柱运动能力之间的关系，为在大位移井工程实际应用中优化钻井设计，制定钻进方案，预测岩屑堆积和减小钻柱摩阻提供理论支撑和科学依据。

In extended reach drilling (ERD), it is common to have cuttings bed packed in the deviated parts of the wellbore. Cuttings transport efficiency and the forces acting on the drill string can affect each other significantly. However, traditional studies on cutting transport and tubular mechanics were isolated from each other, little work has been done on the mechanisms of coupling these two aspects together. This proposed research project will tackle the problems that are commonly encountered during drilling of ERD wells, such as poor hole cleaning, large friction resistance on drill string, insufficient weight on bit, stuck pipe, difficulties in sliding drilling, by coupling dynamic cuttings transport and tubular mechanics. The research scope includes experimental tests of dynamic cuttings transport and its effect on the forces acting on the drill string, development of a coupled transient cuttings transport and torque & drag (T&D) model to simulate the effect of cuttings on torque, drag, and drill string movement. Results of this work will provide important theoretical foundation and practical guidance for improving drilling design, predicting and avoiding problems related to poor hole cleaning and stuck pipe during drilling extended reach wells.