Bit Definition




The cutting or boring element used in drilling oil and gas wells.

This bit consists of a cutting element and a circulating element.

The circulating element permits the passage of drilling fluid and utilized the hydraulic force of the fluid stream to improve drilling rates.

In rotary drilling, several drill collars are joined to the bottom end of the drill pipe column, and the bit is attached to the end of the string of drill collars.

Most bits used in rotary drilling are roller cone bits, but diamond bits are also used extensively.


The tool used to crush or cut rock.

Everything on a drilling rig directly or indirectly assists the bit in crushing or cutting the rock.

The bit is on the bottom of the drillstring and must be changed when it becomes excessively dull or stops making progress.

Most bits work by scraping or crushing the rock, or both, usually as part of a rotational motion.

Some bits, known as hammer bits, pound the rock vertically in much the same fashion as a construction site air hammer.