Patent Number: 6,332,503

Title: Fixed cutter bit with chisel or vertical cutting elements

Abstract: An array of chisel-shaped cutting elements are mounted to the face of a fixed cutter bit. Each cutting element has a crest and an axis which is inclined relative to the borehole bottom. The cutting elements have a hardened diamond exterior on all surfaces in contact with the formation. The chisel-shaped cutting elements may be arranged on a selected portion of the bit, such as the center of the bit, or across the entire cutting surface. In addition, the crest on the cutting elements may be oriented generally parallel or perpendicular to the borehole bottom. The chisel shape and crest orientation increase the initial contact area while reducing aggressiveness. These advantages are achieved without increasing cutter density, reducing back rake, or adding depth of cut limiters. Chisel-shaped cutting elements having crests which are oriented perpendicular to the borehole bottom have the added advantage of displacing the material in a plane that is parallel to the bit face. This reduces the likelihood of harmful bit balling, particularly on heavy set bits with small open face volume.

Inventors: Pessier; Rudolf C. O. (Houston, TX), Scott; Danny E. (Montgomery, TX), Meister; Matthias (Celle, DE), McCormick; Ronny D. (The Woodlands, TX)

Assignee: Baker Hughes Incorporated

International Classification: E21B 17/00 (20060101); E21B 17/10 (20060101); E21B 10/46 (20060101); E21B 10/16 (20060101); E21B 10/56 (20060101); E21B 10/50 (20060101); E21B 10/08 (20060101); E21B 10/52 (20060101); E21B 010/12 ()

Expiration Date: 12/25/2018