دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a method of well control in which bottomhole pressure is kept constant when circulation is not possible and gas is migrating up the hole. Bottom- hole pressure is maintained slightly higher than formation pressure while the gas is allowed to expand in a controlled manner as it moves to the surface.

n: A kind of ways of well control when snubbing service,which blowoff or imput same volumic drilling fluids to complement the difference in pressure.