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1. n. [Formation Evaluation, Drilling Fluids]

The liquid that passes through a filter cake from a slurry held against the filter medium, driven by differential pressure. Dynamic or static filtration can produce a filtrate.

Alternate Form: mud filtrate

See: bridging materialcalcium testchloride testdynamic filtrationfiltrate volumeformaldehydehigh-pressure, high-temperature filtration testlow-pressure, low-temperature filtration testpotassium ionrelative filtrate volumespurt losstotal hardness test