Indroduction to drilling bit jet nozzles for the hole is usually small aroud 0.25 inch in diameter

The part of the bit that includes a hole or opening for drilling fluid to exit.The hole is usually small (around 0.25 inch in diameter) and the pressure of the fluid inside the bit is usually high,leading to a high exit velocity through the nozzles that creates a high-velocity jet below the nozzles.This high-velocity jet of fluid cleans both the bit teeth and the bottom of the hole. The sizes of the nozzles are usually measured in 1/32-inch increments(although some are recorded in millimeters),are always reported in "thirty-seconds"of size(i.e.fractional denominators are not reduced),and usually range from 6/32 to 32/32.

Drilling fluids circulate through a drill string to nozzles at the bit and back to the surface via the system annulus.They provide three crucial functions to drilling:

• Cleaning of the cutting structure
• Cuttings removal from the hole bottom
• Efficient cuttings evacuation to the surface

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