Daniel W Varel

43333648, Jun 8, 1982

Apr 7, 1980

6/138079

Daniel W. Varel - Dallas TX

Varel Manufacturing Company - Dallas TX

B21K 502
E21B 908

76108A

A rotary drill bit for use on a rotating drill string includes a solid forged unitary main body having a plurality of downwardly facing hemi-cylindrical body surfaces. A plurality of cutter bases are provided, each cutter base including an upwardly facing hemi-cylindrical base surface that is fused to one of the body surfaces by electron beam welding. Each cutter base includes a bearing pin extending inwardly with respect to the bit. A cone shaped cutter is rotatably mounted on the bearing pin for rotating about the bearing pin during drilling operations to bore through earth formations.

47637366, Aug 16, 1988

Jul 8, 1987

7/071157

Daniel W. Varel - Dallas TX

Varel Manufacturing Company - Dallas TX

E21B 1016

175341

Improvement in the drilling of vertical bore holes is achieved by an asymmetrical rotary cone bit having a substantially cylindrical body with a shank formed on the body and extending therefrom along a vertical axis for connection to a drill string. Projecting from the cylindrical body are three journal pins, which pins extend from the end of the body opposite from the shank. These three journal pins are circumferentially displaced such that the rotational axis of the first and second pins are displaced more than 120 degrees and less than 180 degrees. The axis of the third journal pin is circumferentially displaced equidistant from the axis of the other two journal pins. Journaled on the first and second journal pins are first and second roller cutter cones having substantially the same based diameter. Each of these cutter cones has cutting teeth extending from the surface thereof and includes a row of gage cutting teeth. A gage roller cone having a smaller base diameter than the first and second roller cones, is journaled on the third journal pin and includes a row of gage cutting teeth.

42561949, Mar 17, 1981

May 19, 1978

5/907485

Daniel W. Varel - Dallas TX

Varel Manufacturing Company - Dallas TX

E21B 1050

175375

A rotary drill bit for use on a rotating drill string includes a solid forged unitary main body having a plurality of downwardly facing hemi-cylindrical body surfaces. A plurality of cutter bases are provided, each cutter base including an upwardly facing hemi-cylindrical base surface that is fused to one of the body surfaces by electron beam welding. Each cutter base includes a bearing pin extending inwardly with respect to the bit. A cone shaped cutter is rotatably mounted on the bearing pin for rotating about the bearing pin during drilling operations to bore through earth formations.