دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see filter cake.

n: A tier of penetrant medium adhering to the borehole face in the filtration process of solid phase of drill fluid.

filter or mud cake, stranded by dehydration on the face of a permeable formation by fluid loss.

n: the character or state of the drilling mud filter cake. According to API RP I3B, such notations as hard," "soft," "tough," "rubbery," and "firm" may be used to convey some idea of cake consistency.

n: the thickness of drilling mud filter cake.

n: The measurement of the thickness of the filter cake deposited by a drilling fluid against a porous medium, most often following the standard API filtration test. Cake thickness is usually reported in 32nd of an inch.

n: The cake formed by cement slurry leaking off free water.

n: Sticking that occurs when a portion of the drill string (usually the drill collars) becomes embedded in the filter cake resulting in a nonuniform distribution of pressure around the circumference of the pipe. The conditions essential for sticking require

n: a condition in which the drill stem becomes stuck against the wall of the wellbore because part of the drill stem (usually the drill collars) has become embedded in the filter cake. Necessary conditions for differential-pressure sticking, or wall sticking, are a permeable formation and a pressure differential across a nearly impermeable filter cake and drill stem. Also called wall sticking. See differential pressure, filter cake.

n: One of the mechanisms causing stuck pipe by having excessive mud weight.

a common method of pipe sticking where the overbalance pressure in the wellbore pushes the tubing against the side of the wellbore in a permeable formation.

a material that forces acid to enter another zone by having a higher viscosity or building a filter cake.

n: the solid stratum granulosum which forms on the borehole wall after the fluid dehydrations in the layer with cellules




filtration control established on the surface of the wellbore by particles large enough to bridge on the entry of the pores.

n: 1. compacted solid or semisolid material remaining on a filter after pressure filtration of mud with a standard filter press. Thickness of the cake is reported in thirty seconds of an inch or in millimetres. 2. the layer of concentrated solids from the drilling mud or cement slurry that forms on the walls of the borehole opposite premeable formations;also called wall cake or mud cake.

n: (1) The soild residue deposited by a drilling fluid against a porous medium, usually filter paper, according to the standard API filtration test. (2) The soild residue deposited on the wall of a borehole during the drilling of permeable formations.


the layer of solids stranded on the face of permeable formations by liquids driven into the rock by pressure differential towards the formation. When sized correctly the filter cake may completely stop losses.

the act of lifting off part of the mud filter cake, at the most permeable sections of the rock, in response to flow produced by draw down.