دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

v: to enlarge the wellbore below the casing.

n: To enlarge a wellbore past its original drilled size. Underreaming is sometimes done for safety or efficiency reasons. Some well planners believe it is safer to drill unknown shallow formations with a small-diameter bit, and if no gas is encountered, to t