دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a roller bit in which the cutters are conical. See bit.

n: See roller cone bit.

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.

n: See four-conebit.

n: refer to four-cone bit

n: refer to four-cone bit

n: see roller cone bit.

n: a drilling bit with two or morecones mounted on bearings. The cutters consist of steel teeth or tungsten carbide inserts. Also called a rock bit.