دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a rapid increase in pressure downhole that occurs when the drill stem is lowered too fast or when the mud pump is brought up to speed after starting.

v: The downhole pressure increase abruptly caused by quick tripping or high starting rate of drill pump.

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

a pressure higher than the hydrostatic column, below the BHA produced by rapid movement of pipe into the well. Maximized in cases with large diameter tools, high viscosity and high pipe speeds. May cause fracturing. Opposite of swabbing.