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MBT test

1. n. [Drilling Fluids]

A test to determine the amount of clay-like materials in a water-base drilling fluid based on the amount of methylene blue dye absorbed by the sample. Results are reported as "MBT" and also as "lbm/bbl, bentonite equivalent" when performed to API specifications.

Synonyms: bentonite equivalent

Alternate Form: methylene blue test