دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pi: buyers who can purchase natural gas from only one supplier and have no access to alternate fuel sources. This term is usually applicable to residential and small commercial users, but can, under certain conditions of alternative fuel availability, be applied to large industrial and electric utility users as well. Also called core customers.

n pi: see captive customers. core cutter head n: the cutting element of the core barrel assembly. In design it corresponds to one of the three main types of bits: drag bits with blades for cutting soft formations;roller bits with rotating cutters for cutting medium-hard formations;and diamond bits for cutting very hard formations.