1. n. [Drilling Fluids]
Ratio of the volume percent synthetic fluid to the volume percent brine in a synthetic mud, where each is expressed as a percent of the total liquid in the mud. The SBR is calculated in an analogous way to the oil/brine ratio using data from the retort test.
Alternate Form: SBR
See: calcium test, chloride test, oil/water ratio, syn, synthetic-base mud, water, oil, and solids test