دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the dispersion of solids that have stuck together in drilling fluid, usually by means of chemical thinners. See flocculation.

n: (1) The process of thinning the drilling fluid by bonding with (neutralizing or covering) the positive electrical charges of drilling fluid additives to prevent one particle of drilling fluid from being attracted to another particle. (2) Breakup of flocs

dispersing a clump or a gathering or “flocculated” of particles. Usually accomplished by dispersants or solvent thinners.

n: (1) Any chemical that promotes the subdivision of a material phase. (2) Any chemical that promotes dispersion of particles in a fluid. Frequently, a deflocculant is inaccurately called a dispersant. Caustic soda is a dispersant but not a deflocculant.

n: organic drilling fluid additives derived from by products of sulphite paper manufacturing processes from coniferous woods. Some of the common salts, such as the ferrochrome, chrome, calcium and sodium, areused as universal dispersants while others are use

a sequence of washes, dispersants, carrying fluids and spacers designed to remove mud and mud cake from the annulus prior to cementing and completion.

a fluid without thinners or dispersants.

a predominately oil phase drilling mud with trace water (<10%) as an additive or a contaminant. Oil as the continuous or external phase. Note: special cleanup and dispersants are needed before displacing with brine or treating with acids.

n: a soluble compound that concentrates on the surface boundary between two substances such as oil and water and reduces the surface tension between the substances. The use of surfactants permits the thorough surface contact or mixing of substances that ordinarily remain separate. Surfactants are used in the petroleum industry as additives to drilling mud and to water during chemical flooding. See micellar- polymer flooding, surfactant mud.

n: A chemical that acts as a surface active agent. This term encompasses a multitude of materials that function as emulsifiers, dispersants, oil-wetters, water-wetters, foamers and defoamers. The type of surfactant behavior, whether acting as an emulsifier o

a chemical that is attracted to the surface of a fluid and modifies the properties such as surface tension.