دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: on a roller cone bit, a coneshaped steel device from which the manufacturer either mills or forges steel teeth, or into which the manufacturer inserts tungsten carbide buttons. Most roller cone bits have three cones, which roll, or rotate, on bearings as the bit rotates. As the cones roll over the formation, the cutters on the cone scrape or gouge the formation to remove the rock.

n: the measure of hydraulic power expended through the bit nozzles for cleaning the bit cutters and the hole bottom.

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 pI: 1. on a bit used on a rotary rig, the elements on the end (and sometimes the sides) of the bit that scrapes, gouges, or otherwise removes the formation to make hole. 2. the parts of a reamer that actually contact the wall of the hole and open it to full gauge. A three-point reamer has three cutters;a six-point reamer has six cutters. Cutters are available for different formations.

n: The cogging of cone of cone bit.

n: See cutters.

n: a bit with four cutters,which display cross symmetric offset spread.

n: to prolong cutters service life.

n pi: the teeth or tungsten carbide inserts in the outermost row on the cones of a bit, so called because they cut the outside edge of the hole and determine the holes gauge or sire. Also called heel teeth.

n: outermost tooth of cone bit.the reason of this name is that they cut
wellbore outermost part and determine the diameter of wellbore.the
outermost tooth is usually shaped II pattern、I pattern、L pattern to prevent excessive wear of the bit diameter。

n: refer to “gauge cutters”