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 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: a subsurface hydrocarbon trap created by faulting, in which an impermeable rock layer has moved opposite die reservoir bed or where impermeable gouge has sealed the fault and stopped fluid migration.

a formation that contains oil or gas that is held in place by a displaced, non permeable rock mass.

n: finely abraded material occurring between the walls of a fault as the result of grinding movement.

n: a roller cone bit each cone of which displays offset from a centre point when a line is extended through the middle of each cone. Offset roller cone bits are usually employed to drill soft formations. because the offset causes the teeth on the cone to gouge and scrape the formation. Gouging and scraping action is required to penetrate soft formations.

n: a fault that contains material of low permeability, such as gouge.

a fault that effectively seals a compartment.

n: a tool used to gouge and clean junk and debris from the casing in conjunction with a junk catcher.

a fishing tool used to find and catch wireline in preparation for fishing the line.