Patent Number: 6,253,864

Title: Percussive shearing drill bit

Abstract: A drill bit that combines the forces of high rotational torque and percussive impact with impact-resistant shear cutting inserts in order to increase formation penetration rates, particularly in deep wells were borehole pressure is high. The drill bit may also be used in cooperation with high-pressure jets that augment penetration, cool the shear cutting inserts, and remove the chips.

Inventors: Hall; David R. (Provo, UT)


International Classification: E21B 10/00 (20060101); E21B 10/46 (20060101); E21B 10/56 (20060101); E21B 10/38 (20060101); E21B 10/60 (20060101); E21B 10/36 (20060101); E21B 010/36 ()

Expiration Date: 07/03/2018