Clyde E Walker

US Patent:

47294388, Mar 8, 1988

Filed:

Jul 3, 1986

Appl. No.:

6/881951

Inventors:

Clyde R. Walker - Spring TX
Burley Glasscock - Sandy UT
Haraldur Karlsson - Sandy UT

Assignee:

Eastman Christensen Co, - Salt Lake City UT

International Classification:

E21B 708

US Classification:

175 76

Abstract:

A stabilizer for use in controlled directional drilling includes a plurality of spaced and axially extending blade elements each having a blade surface face of hardened material. The blade surface face includes a tapered lead portion and a tapered trailing portion with a flat non-tapered surface face portion therebetween. Each blade surface includes an edge portion in which the leading edge is radiused. Thus constructed, the stabilizer reduces kerfing into the formation and hang-up and change of tool face orientation during navigational drilling. Eccentric stabilizers are also described.