Christensen, Inc.

Shell Oil Comapny

Bruce H Walker

David S Rowley

Coy M Fielder

Robijn Feenstra

Heino J Rohde

A jet rotary drill bit confirming a first strainer element allowing the passage of mud carrying small-sized particles, but preventing relatively coarse particles from passing to the jet nozzles. The first strainer element is self-cleaning and the relatively coarse particles are passed on to a second strainer on which they remain trapped.

Rotary bit with jet nozzles

The invention relates to the design of earth bore-hole drill bits employing shaped preform cutters containing hard abrasive materials, such as diamonds, the cutters being mounted in companion preformed sockets in a hard metal bit matrix.

Earth-boring drill bits

The invention relates to the design of earth boring bits employing shaped preform cutters containing hard abrasive materials such as diamonds.

Growing community of inventors

Salt Lake City, UT, United States of America

Bruce H Walker