The complete paper describes the use of underbalanced coiled tubing drilling (UBCTD) technology in tight sandstones, using an integrative approach that incorporates petrophysical, geophysical, and reservoir engineering data. The primary objective is to distinguish between high matrix permeability and natural fractures, focusing on a localized high-permeability region subject to detailed analysis before implementing a UBCTD operation. The integrative methodology examines various data sets, including log data, production-logging-tool (PLT) results, seismic interpretation, well rates, and pressure transient analysis (PTA).
Predrilling Analysis Approach
The success of any well is heavily contingent on strategic placement, a critical factor magnified in the context of UBCTD. Misplacing a well in UBCTD can have catastrophic consequences for productivity and severability. While targeting areas of high flow capacity (kh) is desirable, steering clear of unstable zones and materials prone to creep is equally crucial.
