دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

where CT is used as the primary drill string with a mud (less commonly an electric) motor to rotate the bit. Often used in underbalanced drilling.

n: see perforating with negative pressure.

n: see perforate underbalanced.

n: see perforating with negative pressure.

opening the well to flow against a significantly underbalanced fluid column. A perf cleaning technique.

adj: of or relating to a condition in which pressure in the wellbore is less than the pressure in the fonnation.

perforating the well when the pressure in the wellbore is less than the pressure in the formation.