دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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.

n: a mixture of hydrochloric and hydrofluoric acids and surfactants used to remove wall cake from the wellbore.

n: also called earth acid, it is mixture of hydrogen chloride, hydrogen fluoride and surface acting agent.




an inexact term, usually meaning a mixture of hydrochloric (HCl) and hydrofluoric acid (HF),HCL/HF. HF will dissolve some silicates and some of the components of drilling mud.

n: the sheath of mud solids that forms on the wall of the hole when liquid from mud filters into the formation. Also called filter cake or wall cake.

n: also called filter cake. See cake.

the filter cake on the formation formed by dehydration of the solids as the liquid part of the mud (filtrate) leaks off into the formation.

v: 1. to seal the hole against formation fluids by allowing the build up of wall cake.2. to block off the flow of oil into the wellbore.

n: in drilling, to seal the hole off from the formation water or oil by using mud. Applies especially to the undersirable blocking off of the flow of oil from the formation into the well bore. Special care is given to the treatment of drilling fluid to avoid

n: a section of a borehole in which excessive wall cake has built up, reducing the hole diameter and making it difficult to run the tools in and out. Compare keyseat.

n: The well section that its diameter reducing because mud cake over thick or layer swelling.

a restricted place in the bore hole, caused by wall cake, dog leg, deviation change or other factor.

n: also called filter cake or mud cake. See filter cake.

n: The residue deposited on a permeable medium when a slurry, such as a drilling fluid, is forced against the medium under a pressure. Filtrate is the liquid that passes through the medium, leaving the cake on the medium. Drilling muds are tested to determin

filter cake.

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

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.