hydraulic power oil

hydraulic power oil

[hī′drȯ·lik ¦pau̇·ər ′ȯil]
(materials)
Well production oil from which corrosive and abrasive impurities have been removed; used to power downhole hydraulic pumps.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.