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 material, calcium test, chloride test, dynamic filtration, filtrate volume, formaldehyde, high-pressure, high-temperature filtration test, low-pressure, low-temperature filtration test, potassium ion, relative filtrate volume, spurt loss, total hardness test