jet bit

jet bit

[′jet ¦bit]
(design engineering)
A modification of a drag bit or a roller bit that utilizes the hydraulic jet principle to increase drilling rate.
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The washover technique employed a 3 1/2-inch OD Jet Bit on the end of 2 7/8-inch OD drill pipe to drill the pilot hole.
This system will utilize high-pressure jet bits (10,000 to 15,000 psi) powered by high-pressure downhole motors to drill oil and gas wells 2 to 3 times faster than conventional drills.