Fishbone-like multilateral horizontal wells drilling technology in Bamianhe oilfield

To achieve the objective of "higher yields with fewer wells" in efficient exploration and development of shallow- thin-layer reservoirs in Bamianhe Oilfield, the fishbone-like multilateral horizontal well drilling technology has been introduced. A feasibility study was conducted for implementing multilateral horizontal wells technology in these reservoirs. The application of near-bit geosteering tools enabled precise horizontal trajectory control within thin reservoir layers. Wellpath design and optimization ensured accurate well landing and controlled sidetracking, avoiding thin-layer penetration. An optimized drilling model was established, and open-hole sidetracking and horizontal section operations were successfully implemented by adjusting bottom-hole assembly (BHA) configurations and hydraulic parameters. Through multiparameter strata correlation analysis and accumulated technical expertise, real-time layer exit warnings, trajectory deviation prevention during reaming, and inclination control mechanisms were achieved. Since 2024, these innovations have resulted in 100% success rate in first-attempt sidetracking, 32.21% reduction in drilling duration compared to design, 99% average reservoir penetration rate, and over 80% productivity increase compared to single horizontal wells. This study establishes a standardized workflow for multilateral wells in Bamianhe Oilfield and provides valuable references for efficient development of shallow reservoirs in other oil regions.