1
Tommy M Warren, Lawrence A Sinor: Anti-whirl underreamer. Amoco Corporation, Charles P Wakefield, Richard A Kretchmer, April 4, 1995: US05402856 (159 worldwide citation)

An anti-whirl underreamer comprising a body configured for connection to a drillstring, at least two arms carried by the body which are extendable between a retracted position and a projected position, a movable piston and biased spring assembly for moving the arms, a plurality of cutting elements c ...


2
Tommy M Warren, Houston B Mount: Curved drilling apparatus. Amoco Corporation, James A Gabala, Richard A Kretchmer, June 13, 1995: US05423389 (132 worldwide citation)

A rotary drill bit for drilling a curved subterranean borehole. In one embodiment, the drill bit comprises a side portion, a plurality of cutting elements that produce a lateral force on the drill bit in response to the rotation of the drill bit in the borehole, and bearing means. The bearing means ...


3
Tommy M Warren, Warren J Winters: System for directional drilling and related method of use. Amoco Corporation, Scott H Brown, Fred E Hook, August 8, 1989: US04854397 (119 worldwide citation)

A system for directional drilling and related method of use is described herein which utilizes a drillstring suspended within a wellbore with an MWD and downhole turbine or motor connected adjacent a drill bit on a lower end of the drillstring, and with a top drive and/or rotary table connected adja ...


4
J Ford Brett, Tommy M Warren, L Allen Sinor, Suzanne M Behr: Low friction subterranean drill bit and related methods. Scott H Brown, Fred E Hook, July 21, 1992: US05131478 (111 worldwide citation)

A subterranean drill bit operable with a rotational drive source is provided for drilling in subterranean earthen materials to create a borehole having a borehole wall. The drill bit comprises a drill bit body having a base portion, a gauge portion and a face portion disposed about a bit axis. A plu ...


5
Tommy M Warren, J Ford Brett: Whirl resistant bit. Amoco Corporation, Scott H Brown, Fred E Hook, June 12, 1990: US04932484 (107 worldwide citation)

A whirl resistant drill bit is disclosed for use in rotary drilling. The drill bit includes a generally cylindrical bit body with a plurality of cutting elements extending out from a lower end surface. The cutter elements are grouped in sets such that a first set of cutters are disposed at substanti ...


6
James F Brett, Lawrence A Sinor, Tommy M Warren: Method for modeling and building drill bits. Amoco Corporation, Scott H Brown, Fred E Hook, March 28, 1989: US04815342 (107 worldwide citation)

A method for modeling and building drill bits. An array of spatial coordinates representative of selected surface points on a drill bit body and on cutters mounted thereon is created. The array is used to calculate the position of each cutting surface relative to the longitudinal axis of the bit bod ...


7
J Ford Brett, Tommy M Warren: Method of making imbalanced compensated drill bit. Amoco Corporation, Finnegan Henderson Farabow Garrett & Dunner, April 30, 1991: US05010789 (103 worldwide citation)

An imbalance compensated drill bit is disclosed that takes advantage of undesired and destructive imbalance forces to prevent bit whirl. Methods of designing and making such imbalance compensated drill bits are disclosed whereby a drill bit body has at least one cutting zone with a plurality of cutt ...


8
J Ford Brett, Tommy M Warren: Imbalance compensated drill bit. Amoco Corporation, Finnegan Henderson Farabow Garrett & Dunner, August 27, 1991: US05042596 (96 worldwide citation)

An imbalance compensated drill bit is disclosed that takes advantage of undesired and destructive imbalance forces to prevent bit whirl. Methods of designing and making such imbalance compensated drill bits are disclosed whereby a drill bit body has at least one cutting zone with a plurality of cutt ...


9
Tommy M Warren: Apparatus and method for positioning a tool in a deviated section of a borehole. Amoco Corporation, James A Gabala, Richard A Kretchmer, Frank J Sroka, March 16, 1993: US05194859 (64 worldwide citation)

Apparatus and method for positioning a tool, such as a surveying instrument, in the deviated section of a borehole includes a flexible rod and a positioning assembly. The flexible rod extends from the vertical section into the deviated section of the borehole with the tool being connected to the dow ...


10
Tommy M Warren, Warren J Winters, J Ford Brett: Method for stabilizing a rotary drill string and drill bit. Amoco Corporation, Scott H Brown, Fred E Hook, January 8, 1991: US04982802 (52 worldwide citation)

Apparatus for stabiliing a rotary drill string and drill bit used to drill a borehole in a material, such as a subterranean formation, includes an imbalanced drill collar and a drill bit connected to the drill collar. The imbalanced drill collar creates a drill string imbalance force directed radial ...