دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: The shaker with inertia vibrator that fitted with eccentric shaft.

see velocity string.

n: 1. the area of the formation that is damaged because of the invasion of foreign substances into the exposed section of the formation adjacent to the wellbore during drilling and completion. 2. the pressure drop from the outer limits of drainage to the wellbore caused by the relatively thin veneer (or skin) of the affected formation. Skin is expressed in dimensionless units: a positive value denotes formation damage;a negative value indicates improvement. Also called skin effect.

a dimensionless estimation of obstruction to flow. An undamaged well would have a skin of zero. A damaged well has a positive skin above zero and a stimulated well has a negative skin.

n: in pipeline construction, the process of putting slack in a pipeline to counter the effects of contraction and expansion caused by extreme variations in daily temperature. Instead of laying the pipe in a straight line down the center of a ditch, it is laid so that it alternately touches one side of the ditch or the other, thereby pro- viding a curve or slack in the line.

n: Opening or shutting the valve to entire hole cementing.

n: a valve in the bottom of a retainer.

a water base fluid with only a very small amount of a polymer added to give friction reduction benefit.