دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: false influence on well logging measurement caused by the borehole environment, e.g., diameter, shape, rugosity, type of fluid, or mud cake.

n: The distortion of borehole log due to the change of diameter and shape of wellbore or drilling fludi invasion.

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: An instrument used to measure the friction coefficient of the mud cake

breaker in small pill-form particles that stays with the polymer and helps break the mud cake.

n: the process of the mud cake being eroded because of the flushing affecion during the fluid cycling in the well

n: the tools which can shave off the mud cake when the pipe rotates and whose doctor blades can extend toward borehole well under the pump pressure

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 differential pressure across the mud cake from formation towards the wellbore that will cause some of the mud filter cake to lift off the face of the formation and to re-establish permeability.

a special resistivity tool that measures the resistivity of the mud cake on one curve and the resistivity of the fluids in the formation, but near the wellbore, on a different curve. Separation between the curves is an indication of permeability since mud

n: heavy-duty paper perforated with several very small holes (pores). Folded in accordion pleats, micropore paper often serves as a secondary filter element in an engines fuel system. Fuel passes through the pores, while the unperforated part of the paper stops dirt. microresistivity log n: a resistivity logging tool consisting of a spring device and a pad. While the spring device holds the pad firmly against the borehole sidewall, electrodes in the pad measure resistivities in mud cake and nearby formation rock. See resistivity well logging.