(n.) Drilling Fluids. One of several classes of cement manufactured to the specifications of the American Petroleum Institute (API) Specification 10A. Classes of API cement are A, B, C, D, E, F, G and H. See: API
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}