(n.) Drilling Fluids. Any aqueous solution that contains a buffer mixture (weak acid or weak base and salt of the weak acid or base) to maintain constant or almost constant pH of the system
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}