Abstract:Simultaneous drilling and enlargement is common in deepwater Gulf of Mexico projects. It controls equivalent circulating density, manages pore pressure anomalies, and ensures that casing strings and liners reach total depth (TD). Common hole-enlargement-while-drilling (HEWD) bottomhole assemblies (BHAs) place a concentric hydraulic underreamer above the rotary steerable system (RSS) and measurement-while-drilling/logging-while-drilling (MWD/LWD) package. Although this placement is effective, it could leave up … Show more
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