Study on ECD during the Construction of Extended Reach Wells

The vertical depth and horizontal length of extended reach wells vary greatly, leading to significant pressure losses along the wellbore. Improper downhole pressure control during drilling, tripping, casing running, cementing, and completion operations can result in wellbore collapse, well instability, and other related issues. By researching the downhole ECD model during well construction, the ECD calculation methods were established, which was suitable for drilling, tripping, casing running, cementing, and gravel packing operations. The computation of ECD data across diverse operational scenarios, when coupled with the analysis of three pressure profiles, enables the precise identification of potential hazards for each operation. By implementing suitable mitigation measures, the risks associated with these operations can be significantly reduced. Utilizing an extended reach well as a case study, this paper aims to provide a comprehensive analysis of the process of identifying and mitigating risks through ECD data across various operations. The insights gained from this study will serve as a valuable resource for similar extended reach well projects.