دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A fishing assistant tool be used to fish the lost drill string ,which can help to centralizing the drill string .

n: The wall scraper fixed under the casings ectooecium,which be used to clean the wall cake
of hole wall.

n: A circular brush made by steel wire,which can scratch off the wall cake and develop the quality of cementing.

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

usually differential sticking (by overbalance),but may also include effect of friction and mud cake adhesion to the tubing or drill string.

n: A situation in which the drilling assembly (pipe, drill collars and bottomhole assembly) is stuck in filter cake that was previously deposited on a permeable zone. The pipe is held in the cake by a difference in pressures between the hydrostatic pressure

n: Forming a layer of cementing material of solid grains on the wall of hole when the drilling fluids infiltrating into the layer.

n: see wall hook.

n: see hook-wall packer.

n: see differential sticking.