Drilling the Deepest Onshore Directional Well in Asia: Value of Good Planning and Systematic Execution on an Ultra-Extended-Reach Drilling Campaign

Abstract

Abstract The Yuejin 3-3XC well in the Tahe oilfield, located in the Tarim Basin of China, is more than just a drilling project. It is a scientific endeavor specifically designed to target the carbonate lithology of the Ordovician Yijianfang Formation. Commencing in 1980, the exploration of the field has resulted in over 2,300 wells drilled to date. The well profile of YJ3-3XC presented unique challenges, given the complexity of the geology and the geomechanical risks involved. However, the well was drilled and completed, making it Asia's deepest onshore extended-reach well. The findings from this project are a testament to our technical prowess and a treasure trove of knowledge for the industry. This paper comprehensively summarizes the work and progress in delivering Asia's deepest extended-reach drilling (ERD) project. It covers the technical challenges faced, the design solutions implemented, the operational practices adopted, and the systematic approach to well-planning that led to exceptional results. The paper also discusses the modeling and simulation work to plan and develop a comprehensive well program, real-time data to validate models resulting in significant cost savings, and the processes adopted to ensure team-wide understanding and commitment to delivering successful wells. Completing the YJ3-3XC well is not just a testament to the successful navigation of the region's unique geological and geomechanical challenges associated with deep drilling. It is a significant milestone, marking Asia's deepest onshore extended-reach well. The successful delivery of this project is a source of pride, demonstrating the importance of technical innovation, design solutions, and operational excellence in overcoming technical challenges in complex geological environments.