E

Eductor.: (1) A device utilizing a fluid stream discharging under high pressure from a jet through an annular space to create a vacuum. When properly arranged, it can evacuate degassed drilling fluid from a vacuum-type degasser. (2) A device using a high-velocity jet to create a vacuum that draws in liquid or dry material to be blended with drilling fluid.
Effective screening area.: The portion of a screen surface available for solids separation.
Effluent.: A discharge of liquid. Generally used to describe a stream of liquid after some attempt at separation or purification has been made. See: discharge.
Elastomer.: Any rubber or rubber-like material (such as polyurethane).
Electric logging.: Logs run on a wire line to obtain information concerning the porosity, permeability, density, and/or fluid content of the formations drilled. The drilling-fluid characteristics may need to be altered to obtain good logs.
Electrolyte.: A substance that dissociates into charged positive and negative ions when in solution or a fused state. This electrolyte will then conduct an electric current. Acids, bases, and salts are common electrolytes.
Elevation head.: The pressure created by a given height of fluid. See: hydrostatic pressure head.
Emulsifier.: A substance used to produce a mixing of two liquids that do not solubilize in each other or maintain a stable mixture when agitated in the presence of each other. Emulsifiers may be divided into ionic and nonionic agents, according to their behavior. The ionic types may be further divided...

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Drilling Fluids Processing Handbook

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