دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: The peak of bit wing, cutting formation face directly.

n: The granule of diamond emerges continuously with wornout of matrix in the using of impregnated bit and polycrystalline diamond compact bit.

n: a drilling bit with cutting edges of hard alloys. Developed about 1900, and first used with the rotary system of drilling, it is still useful . drilling very soft formations. Also called drag bit

n: the balde bit whose wings shape seem like fish tail

a drag bit with no moving parts, rotated like a conventional metal drilling bit.

n: peripheral cutting edge of blade bit 。It cut ectooecium of wellbore
and determine the diameter of the wellbore。

n: 1. a tool for forming an internal screw thread. It consists of a hardened tool-steel male screw grooved longitudinally so as to have cutting edges. 2. a hole or opening in a line or vessel into which a gauge or valve may be inserted and screwed tight. v: 1. to form a female thread by means of a tap. 2. to extract or cause to flow by means of a bore- hole, e.g., to tap a reservoir.

a valve on a line.

n: The angle between fore and back blade at the top of blade.