Michael Darrell Oliver

US Patent:

58530550, Dec 29, 1998

Filed:

Jun 27, 1996

Appl. No.:

8/671517

Inventors:

Michael A. Siracki - The Woodlands TX
Per I. Nese - Houston TX
Alan W. Lockstedt - Tomball TX
Dennis Cisneros - Kingwood TX
Michael S. Oliver - Lafayette LA
Gary R. Portwood - Kingwood TX

Assignee:

Smith International, Inc. - Houston TX

International Classification:

F21B 1018

US Classification:

175340

Abstract:

A rotary cone bit for drilling bore holes in earth formations whose body has a thread pin end and a dome end from which extend three legs. A cutter cone is rotatably mounted to each leg and is radially oriented about the bit's central axis. Each cutter cone has a gage row of cutting elements extending from the cone surface nearest the mouth and a nose row extending nearest the cone's apex. A center jet for emitting fluid or mud is located on the dome. The jet has a converging nozzle with an exit orifice which extends below a predefined horizontal plane intersected by the cones or cutting elements. The exit orifice has a constant diameter for a length at least equal to its diameter for reducing the diffusion of the fluid or mud flow emitted. Fluid or mud emitted from the center jet travels substantially uninterrupted within a cylindrical space between the cones which is not invaded by any cutting element. This reduced diffusion substantially uninterrupted fluid flow strikes the bore hole bottom with maximum impact energy for enhanced removal of earth formation cuttings.

US Patent:

53221362, Jun 21, 1994

Filed:

Jul 17, 1992

Appl. No.:

7/916285

Inventors:

Huy D. Bui - Houston TX
Michael S. Oliver - Lafayette LA

Assignee:

Smith International, Inc. - Houston TX

International Classification:

E21B 414

US Classification:

175 65

Abstract:

An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom of the piston transfers the impact energy to the formation and rotates during operation independent of an attached drill string.

US Patent:

RE368482, Sep 5, 2000

Filed:

Jun 18, 1996

Appl. No.:

8/665801

Inventors:

Huy D. Bui - Houston TX
Michael S. Oliver - Lafayette LA

Assignee:

Smith International, Inc. - Houston TX

International Classification:

E21B 414

US Classification:

175 65

Abstract:

An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom of the piston transfers the impact energy to the formation and rotates during operation independent of an attached drill string.