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ID.: Inside diameter of a pipe.
Ideal nozzle.: Orifice that will pass fluid without friction loss, theoretically.
Impeller.: A spinning disc in a centrifugal pump with protruding vanes used to accelerate the fluid in the pump casing.
Indicator.: Substances in acid/base titrations that in solution change color or become colorless as the hydrogen ion concentration reaches a definite value. These values vary with the indicator. In other titrations such as chloride, hardness, and other determinations, these substances change color at the end of the reaction. Common indicators are phenolphthalein, methyl orange, and potassium chromate.
Inertia.: Force that makes a moving particle tend to maintain its direction or a particle at rest to remain at rest.
Inhibited drilling fluid.: A drilling fluid having an aqueous phase with a chemical composition that tends to retard and even prevent (inhibit) appreciable hydration (swelling) or dispersion formation clays and shales through chemical and/or physical reactions. See: calcium-treated drilling fluids, saltwater drilling fluid.
Inhibited mud.: See: inhibited drilling fluid.
Initial gel.: See: gel strength.
Inlet.: The opening through which the feed mud enters a solids-control device. See: feed inlet, feed opening.
Interfacial tension.: The force required to break the surface definition between two immiscible liquids. The lower the interfacial tension between the two phases of an emulsion, the greater the ease of emulsification. When the values approach zero, emulsion formation is spontaneous. See: emulsion, surface tension.
Intermediate (solids).: Particles whose diameter is between...

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Drilling Fluids Processing Handbook

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