دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the common name for anhydrous calcium sulphate. caSﾰ4.

n: The main component is calcium sulphate which has no crystal water. The formation which contains this gypse is very usual in drilling and it can contaminate the fresh water drilling fluid. This formation swells when the drilling fluid go through it and som

CaSO4 formation. Usually formed as an evaporite from a drying lake of trapped sea water.

n: a colloidal clay, composed primarily of montmorillonite, that swells when wet. Because of its gel-forming properties, bentonite is a major component of waterbase drilling muds. See gel, mud.

a reference to colloidal clay (generally montmorillinite or smectite),generates plastic viscosity due to clay behavior, size and electrostatic layer. A slurry of which used for P&A Purposes will weigh no less than 9 ppg.

the absorption and modification of the clay matrix by a reactive water.

a map of the acoustic strata record between two wells where the emitter is in one well and the receiver is in the other.

n: See surface hydration.

n: cement that expands as it sets to form a tighter fit around casing and formation.

n: refer toswelling cement

cement with additives that promote volumetric cement expansion.

n: refer to swelling cement

n: the sticking that because the property of drill fluid is not good, causing layer is became slack because of too much filter loss,or the argillutite swelled because of the hole section which angle of bedding are too large stripping into the well.

n: an equipment that is eable to divide annular resulting from swelling,which installed in the first casing of string or in the necessary places, protecting the bottom hole layer in cement job,