(n.) Drilling Fluids. The volume percent of oil in a mud. The term should not be used to refer to the amount of synthetic fluid. See: Diesel-Oil Mud, Invert-Emulsion Oil Mud, Oil-Base Mud, Syn, Synthetic-Base Mud, Water, Oil And Solids Test
Schlumberger Ltd. (The World's Leading Supplier Of Technology, Integrated Project Management And Information Solutions to Customers Working in The Oil and Gas Industry Worldwide), Schlumberger Oilfield Glossary Cedex, France 2014. http://www.glossary.oilfield.slb.com/en/Terms/sym/ a.aspx, (Ergo - Brit) {766}