fluid viscosity ratio

fluid viscosity ratio

[¦flü·əd vi′skäs·əd·ē ‚rā·shō]
(petroleum engineering)
Ratio of viscosity of a displacing gas to that of oil in a gas-drive reservoir; used in unit displacement efficiency calculations.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.