Alan Lee Marshall

US Patent:

8387725, Mar 5, 2013

Filed:

Apr 14, 2008

Appl. No.:

12/102324

Inventors:

Shantanu Swadi - Cypress TX, US
Angelo Spedale - Cypress TX, US
Charles Dewey - Houston TX, US
Alan J. Marshall - Lost Creek WV, US

Assignee:

Smith International, Inc. - Houston TX

International Classification:

E21B 10/36

US Classification:

1754201

Abstract:

A hammer bit for drilling a borehole in earthen formations comprises a bit body having a bit axis and a bit face. The bit face includes an inner region extending from the bit axis to about 50% of the bit radius and an outer region extending from the inner region to the outermost radius. In addition, the bit comprises a plurality of gage cutter elements mounted to the bit face in a circumferential gage row in the outer region. Further, the bit comprises a plurality of adjacent to gage cutter elements mounted to the bit face in a circumferential adjacent to gage row in the outer region. The cutting profile of at least one cutter element in each row in the outer region radially overlaps with the cutting profile of at least one other cutter element in a different row in rotated profile view.

US Patent:

20130175096, Jul 11, 2013

Filed:

Mar 4, 2013

Appl. No.:

13/784175

Inventors:

Smith International, Inc. - Houston TX, US
Angelo Spedale - Cypress TX, US
Charles Dewey - Houston TX, US
Alan J. Marshall - Lost Creek WV, US

Assignee:

Smith International, Inc. - Houston TX

International Classification:

E21B 10/36

US Classification:

1754201

Abstract:

A hammer bit for drilling a borehole in earthen formations. In an embodiment, the bit comprises a bit body having a bit axis and a bit face. The bit face includes an inner region extending from the bit axis to about 50% of the bit radius and an outer region extending from the inner region to the outermost radius. In addition, the bit comprises a plurality of gage cutter elements mounted to the bit face in a circumferential gage row in the outer region. Further, the bit comprises a plurality of adjacent to gage cutter elements mounted to the bit face in a circumferential adjacent to gage row in the outer region. The cutting profile of at least one cutter element in each row in the outer region radially overlaps with the cutting profile of at least one other cutter element in a different row in rotated profile view.