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, Wei Xu: Expandable underreamer/stabilizer. Smith International, Conley Rose P C, May 11, 2004: US06732817 (218 worldwide citation)

A downhole tool that functions as an underreamer, or alternatively, as a stabilizer in an underreamed borehole. The tool includes one or more moveable arms disposed within a body having a flowbore therethrough in fluid communication with the wellbore annulus. The tool alternates between collapsed an ...


3
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 ...


4
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 ...


5
Charles H Dewey, James E Saylor: Remotely operable hydraulic underreamer. Smith International, Conley Rose & Tayon P C, April 30, 2002: US06378632 (85 worldwide citation)

An underreamer opens a borehole below a restriction that is larger than the restriction itself. The underreamer includes cutters which engage the formation by traversing outward and upward. The force pushing the cutters to the extended position is supplied by a piston built into each cutter support. ...


6
Charles H Dewey, Wei Xu: Expandable underreamer/stabilizer. Smith International, Conley Rose P C, Shannon W Bates, May 23, 2006: US07048078 (80 worldwide citation)

A downhole tool that functions as an underreamer or as a stabilizer in an underreamed borehole. The tool includes one or more moveable arms disposed within a body having a flowbore therethrough in fluid communication with the wellbore annulus. The tool alternates between collapsed and expanded posit ...


7
Charles H Dewey, Wei Xu: Fluid flow control devices and methods for selective actuation of valves and hydraulic drilling tools. Smith International, Conley Rose & Tayon, September 18, 2001: US06289999 (76 worldwide citation)

Flow control devices and associated control methods are described for use with hydraulic tools, such as those in a drill string. The described flow control device is typically incorporated into a drill string and is selectively operable in either a flow-through mode or a valve control mode. In the v ...


8
Charles H Dewey, Wei Xu: Selectively actuatable expandable underreamer/stablizer. Smith International, Conley Rose P C, January 1, 2008: US07314099 (74 worldwide citation)

An expandable downhole tool comprises a tubular body having an axial flowbore extending therethrough, at least one moveable arm, and a selectively actuatable sleeve that prevents or allows the at least one moveable arm to translate between a collapsed position and an expanded position. A method of e ...


9
Praful C Desai, Charles H Dewey: Method and apparatus for milling well casing and drilling formation. Smith International, September 2, 2003: US06612383 (73 worldwide citation)

A dual function drag bit is used in a method for both milling well casing or liner and subsequently drilling rock formation without the sequential removal of a milling assembly and replacement with a drilling assembly. The method employs a cutting tool that is capable of both milling steel pipe casi ...


10
John H Furse, Praful C Desai, Charles H Dewey: Underreamer. Smith International, Christie Parker & Hale, April 28, 1987: US04660657 (62 worldwide citation)

This underreamer has a lower body and a tubular upper body connected above it. A pair of extendible cutter arms are scissored in the lower body for pivoting between retracted and extended positions. A sleeve fixed to the lower body extends upwardly within the upper body with an outside diameter smal ...