Solving the blind spot problem with reentry CT drilling

摘要

GWD avoids sensor inadequacies. While the main drilling attention over recent years has been about new unconventional and deep-water wells, nearly 70 of the world's hydrocarbon production comes from declining fields. There is a compelling economic case that extracting more from known reservoirs is a better idea than the cost and risks of a new project. In practice, working over mature fields involves various EOR techniques and reentering wells to drill horizontal laterals from a window cut in the existing wellbore. An established if not yet widely adopted technique to do this is to use coiled tubing (CT) drilling to drill in underbalanced conditions.