Directional drilling is a common and essential procedure of major extended reach drilling operations. With the development of directional drilling technologies, the percentage of recoverable oil production has increased. However, its challenges, like real-time bit steering, directional drilling tools selection and control, are main barriers leading to low drilling efficiency and high nonproductive time. The fact inspires this study. Our work aims to contribute to the better understanding of directional drilling, more specifically regarding rotary steerable system (RSS) technology. For instance, finding the solutions of the technological challenges involved in RSSs, such as bit steering control, bit position calculation and bit speed estimation, is the main considerations of our study. Classical definitions from fundamental physics including Newton’s third law, beam bending analysis, bit force analysis, rate of penetration (ROP) modeling are employed to estimate bit position and then conduct RSS control to steer the bit accordingly. The results are illustrated in case study with the consideration of the 2D and 3D wellbore scenarios.

定向钻井是大型延伸钻井作业的常见且必不可少的步骤。随着定向钻井技术的发展，可采石油产量的百分比增加了。但是，其挑战（例如实时钻头转向，定向钻具的选择和控制）是导致钻探效率低和非生产时间长的主要障碍。事实启发了这项研究。我们的工作旨在帮助更好地理解定向钻井，尤其是关于旋转可控系统（RSS）技术。例如，寻找RSS涉及的技术挑战的解决方案，例如钻头转向控制，钻头位置计算和钻头速度估算，是我们研究的主要考虑因素。来自基础物理学的经典定义包括牛顿第三定律，梁弯曲分析，钻头力分析，穿透速率（ROP）建模被用来估算钻头位置，然后进行RSS控制以据此操纵钻头。在案例研究中结合2D和3D井眼场景对结果进行了说明。