A case study on the passability of slim dual bend screw drills in high curvature sidetracking through slim boreholes from the Southern Ordos Basin.

ABSTRACT: The redevelopment of complex fault-block oilfields in the Southern Ordos Basin faces dual challenges of slim-wellholes (Φ120 mm) and high curvature (build-up rate > 57°/30 m), where the passability of slim (Φ73 mm) dual-bend screw drilling tools (1.5° + 3°) is particularly critical. Moving beyond traditional geometric or static analysis, this study establishes an innovative "casing-open hole" passability evaluation model that explicitly couples the effects of Weight on Bit (WOB) and borehole curvature, based on the beam-column theory and contact mechanics, while considering the unique constraints of slim tools. In the casing section, geometric constraints verified the feasibility of the tool's passage with a maximum lower bend point displacement of 47.3 mm inside Φ124.3 mm casing. In the o

SUBMITTER: Hui Z 

PROVIDER: S-EPMC12800139 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature