Drill bit (well)
The drill bit is hollow and has jets to allow for the expulsion of the drilling fluid, or "mud", at high velocity and high pressure to help clean the bit and, for softer formations, help to break apart the rock. A tricone bit comprises three conical rollers with teeth made of a hard material, such as tungsten carbide. The teeth break rock by crushing as the rollers move around the bottom of the borehole. A polycrystalline diamond compact (PDC) bit has no moving parts and works by scraping the rock surface with disk-shaped teeth made of a slug of synthetic diamond attached to a tungsten carbide cylinder.
PDC bits, which first came into widespread use in 1976, are used for gas and oil exploration in the North Sea. They are effective at drilling shale formations, especially when used in combination with oil-base drilling muds.
Drilling rig (petroleum) — diagram of a drilling rig
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