Ultra-Long Extended Reach Horizontal Well for Enhanced Reservoir Access Using Conventional Technology Application

Abstract The oil and gas industry are constantly looking for ways to improve production efficiency while keeping costs under control and reducing environmental impact. One approach gaining attention is drilling ultra-long extended reach drilling wells (ERD), particularly in mature fields where maximizing recovery is crucial. This paper describes the planning and execution of a pilot ultra-long ERD well in a long-established oil field in the United Arab Emirates (UAE). The project focused on using conventional, cost-efficient drilling and logging-while-drilling (LWD) tools to assess the feasibility of this approach and evaluate its potential for future applications. The well achieved a remarkable 18,525 feet of lateral section drilled in 6-inch hole size with 2.18:1 step-out ratio, classifying it as an ERD well, with 94.8% of the wellbore positioned within the target zones, navigating a complex anticlinal structure and a fault. Using conventional tools in extreme downhole conditions; high temperature (reaching 295°F), high levels of shocks and vibrations, drilling string and surface equipment limitations. For this operation, the bottom hole assembly (BHA) was carefully designed to balance performance with cost-effectiveness while minimizing risks. It included a rotary steerable system, an azimuthal resistivity tool for real-time geosteering, and a sonic tool for porosity measurement. By relying on standard LWD tools, rather than bespoke or highly specialized equipment, the team was able to keep costs manageable without compromising the quality of the operation. The BHA was also optimized to reduce the risk of stuck pipe, ensuring smooth drilling in a challenging reservoir environment. The early findings suggest that combining standard, field-tested tools with innovative drilling strategies can deliver cost-effective solutions for mature fields. This approach reduces the need for multiple wells, lowers operational risks, and minimizes surface footprint, making it both attractive and practical. While the long-term impact of this well is still uncovered, this project lays the groundwork for further exploration. In conclusion, the successful execution of this pilot project demonstrates that ultra-long ERD wells can be a promising solution when paired with conventional tools and careful planning. The lessons learned such as the importance of efficient BHA design, precise geosteering, and collaboration across disciplines offer valuable guidance for future projects. Moving forward, as the industry continues to manage costs and improve efficiency, this approach may become an essential part of field development strategies.