دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

any portion of the wellhead or tree that contains wellbore pressure.

n: a specialised form of intermittent-flow gas lift that functions in the same way as other forms, except that, when the injection gas is off, incoming well fluids accumulate in a chamber having a larger diameter than the tubing. For the same volume of fluid, hydrostatic head and wellbore pressure at the formation are both reduced.

n: in drilling,formation pressure is balanced by mud fluid hydrostatic column pressure .

elevating the near wellbore pressure of a formation through leak-off of wellbore fluids during drilling, completion or workover.

n: see differential sticking.

n: A condition whereby the drillstring cannot be moved (rotated or reciprocated) along the axis of the wellbore. Differential sticking typically occurs when high-contact forces caused by low reservoir pressures, high wellbore pressures, or both, are exerted

n: 1. bottomhole pressure. 2. casing pressure.