Petroleum engineer international - Vol. 58, No. 4 (Apr. 1986) ; 102 p.

Drill strings take on new look / Steven D. Moore -- Reconsider gas engines for beam pumps / J.F. Lea -- Advanced EOR technologies raise profit potential / Joseph J. Dailey -- Standard oil applies extended-reach drilling to prudhoe bay / Jeff Littleton -- Innovations, regulations change drilling fluids / Ed Malachosky -- Maximizing recovery using completion and workover fluids / Dan Acosta -- Proper water clarification increases oil recovery / Jim Long.

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