Wiktionary
alt. 1 A twist drill. 2 Any other style of cutter, for example a spade drill, that is rotated and fed in a similar manner as a twist drill to of cut a hole in metal, wood or other materials. n. 1 A twist drill. 2 Any other style of cutter, for example a spade drill, that is rotated and fed in a similar manner as a twist drill to of cut a hole in metal, wood or other materials.
WordNet
n. a bit used in drilling for oil [syn: drilling bit]
Wikipedia
Drill bits are cutting tools used to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shape and can create different kinds of holes in many different materials. In order to create holes drill bits are attached to a drill, which powers them to cut through the workpiece, typically by rotation. The drill will grasp the upper end of a bit called the shank in the chuck.
Drill bits come in standard sizes, described in the drill bit sizes article. A comprehensive drill bit and tap size chart lists metric and imperial sized drill bits alongside the required screw tap sizes. There are also certain specialized drill bits that can create holes with a non-circular cross-section.
While the term drill may refer to either a drilling machine or a drill bit for use in a drilling machine. In this article, for clarity, drill bit or bit is used throughout to refer to a bit for use in a drilling machine, and drill refers always to a drilling machine.
In the oil and gas industry, a drill bit is a tool designed to produce a generally cylindrical hole ( wellbore) in the earth’s crust by the rotary drilling method for the discovery and extraction of hydrocarbons such as crude oil and natural gas. This type of tool is alternately referred to as a rock bit, or simply a bit. The hole diameter produced by drill bits is quite small from about to compared to the depth of the hole produced from to more than . Subsurface formations are broken apart mechanically by cutting elements of the bit by scraping, grinding or localized compressive fracturing. The cuttings produced by the bit are most typically removed from the wellbore and continuously returned to the surface by the method of direct circulation.
A drill bit is a tool used in a drill to create cylindrical holes.
Drill bit or Drillbit may also refer to:
- Chicago Spire, a former building nicknamed the "Drill Bit"
- Drill bits in mechanical drilling, drill bits used for oil wells, etc.
Usage examples of "drill bit".
We came to the rig and climbed on to the platform and stood there watching the table turning and the block slowly inching down as the drill bit into the rock two hundred feet below us.
Behind the goggles, Ariel's eyes slowly shifted from the point of the drill bit to the keyhole.
But all she could do for now was brood over what the invisible drill bit would find.
The drill bit hadnt even ground down as far as the deepest roots of the hardiest desert plants.
The reflected heat from the wall and the drill bit did not reach him.
The implication was obvious, and it went on: Mr Sandford, who was recently elected to the Zetland County Council, drew a hair-raising picture of what could happen if this rig were to break adrift at the moment when the drill bit had penetrated an underwater oil reservoir.
The drill bit was around four feet long and 140 pounds, and had a chisellike cutting edge.
Now, it would take an enormous drill to do these, far too big for a person to lift, and some of these holes are in places no drill rig could reach, not to mention the fact that these lines go all the way from one end of camp to another, which would require a drill bit some two hundred meters long.
I checked my watch as the drill bit tore into the grass and then deep into the soil.
The convenient indents on the surface, which had stopped the drill bit slipping around, marked the solid struts in the hollow-block material.