1
Clyde A Willis, Clyde D Durrett: Apparatus for gripping a down hole tubular for support and rotation. W N Apache Corporation, Willian Brinks Hofer Gilson & Lione, March 29, 1994: US05297833 (130 worldwide citation)

An apparatus for gripping a down hole tubular for support and rotation, or a string of such tubulars, includes a body element adapted to be rotated at high torques either by a top head drive or a rotary table of an earth drilling machine. Gripping elements are mounted in a central cavity of the body ...


2
Clyde A Willis: Apparatus for gripping a down hole tubular for rotation. W N Apache Corporation, Willian Brinks Olds Hofer Gilson & Lione, August 6, 1991: US05036927 (107 worldwide citation)

An apparatus for gripping a down hole tubular for rotation in a drilling machine includes a support member adapted for connection to the quill of the drilling machine. The support member supports three or more guides which converge toward one another in a selected direction. A clamping dog or engagi ...


3
Clyde A Willis, Keith M Haney: Top head drive assembly for earth drilling machine and components thereof. 501 W N Apache Corporation, Willian Brinks Olds Hofer Gilson & Lione, April 18, 1989: US04821814 (95 worldwide citation)

A top head drive assembly for a drilling machine includes a wrench assembly used to make up and break out threaded connections. This wrench assembly is mounted for axial movement on rails of the top head drive assembly, and is positioned immediately under the quill. The top head drive assembly also ...


4
Clyde A Willis, Jerry K Lingafelter: Automatic sequencing system for earth drilling machine. W N Apache Corporation, Willian Brinks Hofer Gilson & Lione, March 15, 1994: US05294228 (93 worldwide citation)

An earth drilling machine of the type having a boom mounted adjacent a mast to move a tubular between a lower, horizontal boom position and an upper, vertical boom position also includes a lifter configured to move a length of downhole tubular between a lower lifter position aligned with a tubular s ...


5
Clyde A Willis: Self-centering clamp for down-hole tubulars. Walker Neer Manufacturing Co, Hume Clement Brinks Willian & Olds, September 13, 1983: US04403897 (67 worldwide citation)

A self-centering clamp for drilling tubulars includes first and second transverse guide rods. Two opposed clamping jaws are guided along the first guide rod. These jaws are positioned by two opposed rocker arms, each of which is mounted to a cross brace which slides along the second guide rod. The r ...


6
Clyde A Willis: Inner tube assembly for dual conduit drill pipe. Walker Neer Mfg Co, Hume Clement Brinks Willian & Olds, July 28, 1981: US04280535 (66 worldwide citation)

In a dual conduit drill pipe section having concentric inner and outer tubes, a plurality of centering lugs are provided which are disposed between the inner and outer tubes and include bearing surfaces which are adapted to reduce the friction and wear associated with the movement of the inner tube ...


7
Clyde A Willis: Self centering tongs and transfer arm for drilling apparatus. Walker Neer Manufacturing Co, Hume Clement Brinks Willian & Olds, September 13, 1983: US04403666 (64 worldwide citation)

A drill rig having a drill rig mast and a transfer arm is described. The clamps of the transfer arm are resiliently mounted to the transfer arm so as to provide limited axial movement of the clamps and thereby of a clamped down hole tubular. This resilient support for the down hole tubular serves to ...


8
Clyde A Willis: Modular drilling machine and components thereof. W N Apache Corporation, William Brinks Olds Hofer Gilson & Lione, July 26, 1988: US04759414 (60 worldwide citation)

A drilling machine includes a drilling substructure skid which defines two spaced parallel skid runners and a platform. The platform supports a draw works mounted on a draw works skid, and a pipe boom is mounted on a pipe boom skid sized to fit between the skid runners of the drilling substructure s ...


9
Clyde A Willis: Lifting apparatus for down-hole tubulars. Walker Neer Manufacturing Co, Hume Clement Brinks Willian & Olds, October 4, 1983: US04407629 (46 worldwide citation)

An improved boom for a drill rig is described which includes two rotatably mounted clamps which are rotatable between a side loading position, to facilitate loading and unloading in the horizontal position, and a central position, in which a clamped tubular is aligned with the drilling axis when the ...


10
Clyde A Willis: Method of assembling a modular drilling machine. W N Apache Corporation, Willian Brinks Olds Hofer Gilson & Lione, April 18, 1989: US04821816 (37 worldwide citation)

A drilling machine includes a drilling substructure skid which defines two spaced parallel skid runners and a platform. The platform supports a draw works mounted on a draw works skid, and a pipe boom is mounted on a pipe boom skid sized to fit between the skid runners of the drilling substructure s ...