1
Lance D Underwood, Harold D Johnson, Charles H Dewey: Method and apparatus for automatic closed loop drilling system. Halliburton Company, Michael F Heim, July 26, 1994: US05332048 (234 worldwide citation)

An automatic closed loop drilling system is disclosed for providing automatic directional drilling capabilities in a bottomhole assembly. The drilling system includes at least one adjustable stabilizer that varies in response to formational and drilling conditions encountered downhole. A microcontro ...


2
Charles H Dewey, Lance D Underwood, Harold D Johnson: Adjustable stabilizer. Halliburton Company, Michael F Heim, June 7, 1994: US05318138 (116 worldwide citation)

A downhole adjustable blade stabilizer is disclosed for varying the position of stabilizer blades to provide an increased ability to control the direction of drilling. The adjustable blade stabilizer includes a plurality of blades mounted in an angled track to permit axial and radial movement of the ...


3
Harold D Johnson, Charles H Dewey, Lance D Underwood: Method and apparatus for adjusting the position of stabilizer blades. Halliburton Company, Michael F Heim, June 7, 1994: US05318137 (92 worldwide citation)

A telemetering system is disclosed for communicating command signals to a downhole adjustable blade stabilizer, and for transmitting encoded time/pressure signals back to the surface. The command signal provides information regarding a desired blade position for an adjustable blade stabilizer. The s ...


4
Madapusi K Keshavan, Lance D Underwood, Naresh J Kar, Thomas W Oldham, Cary A Roth, Brian J Armstrong: Hard facing for milled tooth rock bits. Smith International, Christie Parker & Hale, June 6, 1989: US04836307 (61 worldwide citation)

A hard facing for teeth on a milled tooth rock bit comprises at least 65% by weight of a mixture of tungsten carbide particles and a balance of steel bonding the carbide particles together and to the cutter cone of the rock bit. The tungsten carbide particle mixture comprises from 35% to 80%, and pr ...


5
Lance D Underwood, Charles H Dewey: Steerable underreamer/stabilizer assembly and method. Smith International, Osha • Liang, April 7, 2009: US07513318 (54 worldwide citation)

A bottom hole assembly includes a drill bit, a stabilized underreamer assembly located behind the drill bit, and a drilling assembly. A method to drill a formation includes positioning a stabilized underreamer assembly behind a drill bit, positioning a drilling assembly behind the stabilized underre ...


6
Richard D Bottos, Lance D Underwood: Internally profiled stator tube. Halliburton Energy Services, Conley Rose & Tayon P C, October 30, 2001: US06309195 (54 worldwide citation)

A thick walled Moineau-style stator and method of manufacture are disclosed. The outer profile of the stator follows the inner helical profile of the stator. The application of an elastomeric layer to the inner profile of the stator results in a constant thickness for the elastomeric layer and proxi ...


7
Lance D Underwood, Shantanu N Swadi: Inline bladder-type accumulator for downhole applications. Smith International, Conley Rose P C, April 8, 2008: US07353845 (50 worldwide citation)

An accumulator comprises a housing connected to a hydraulic system, an elastomeric bladder separating a gas compartment from a fluid compartment, and an anti-extrusion device. A method for operating an accumulator comprises connecting the accumulator to a hydraulic system, injecting an inert gas int ...


8
Lance D Underwood, Harold D Johnson, Charles H Dewey, Mark J Hommel: Moineau motor with conduits through the stator. Smith International, Robert G Upton, December 15, 1992: US05171139 (38 worldwide citation)

A progressive cavity drilling motor is disclosed with a multiplicity of helically formed conduits positioned in a resilient stator. The conduits are placed between an inner wall of a motor casing and a helically formed through hole formed by the stator. The conduits are located in parallel with each ...


9
James Estep, Lance D Underwood, Albert Odell: Bottom hole assembly for directional drilling. Halliburton Energy Services, Conley Rose & Tayon P C, January 12, 1999: US05857531 (34 worldwide citation)

The bottom hole assembly of the present invention includes a drill bit driven by a positive displacement drilling motor, the motor being constructed of tubular housings, one of said housings having a bend so as to cause the bit to drill directionally, another housing containing a rotor and stator to ...


10
Madapusi K Keshavan, Lance D Underwood, Naresh J Kar, Thomas W Oldham, Cary A Roth, Brian J Armstrong: Hard facing for milled tooth rock bits. Smith International, Christie Parker & Hale, July 31, 1990: US04944774 (33 worldwide citation)

A hard facing for teeth on a milled tooth rock bit comprises at least 65% by weight of a mixture of tungsten carbide particles and a balance of steel bonding the carbide particles together and to the cutter cone of the rock bit. The tungsten carbide particle mixture comprises from 35% to 80%, and pr ...