1
Roger L Schultz, Orlando De Jesus, Andrew J Osborne Jr: Differential sensor measurement method and apparatus to detect a drill bit failure and signal surface operator. Halliburton Energy Services, Robert Groover, Groover & Associates, November 18, 2003: US06648082 (54 worldwide citation)

An apparatus and accompanying method for monitoring and reporting downhole bit failure. Individual sensors are placed on a sub which is separate from the drill bit itself, and are powered by a vibration driven power system. The sensor readings are used to compute values which represent the ratios of ...


2
Roger L Schultz, Orlando De Jesus, Andrew J Osborne Jr: Leadless sub assembly for downhole detection system. Halliburton Energy Services, Robert O Groover, March 30, 2004: US06712160 (43 worldwide citation)

A drill string is equipped with a down hole sub assembly which contains sensors to detect equipment condition during drilling. The sub assembly has no electrical communication with the drill bit itself, and the sensors detect drill bit condition from vibrations or strain or other detectable phenomen ...


3
Roger L Schultz, Orlando De Jesus, Andrew J Osborne Jr: Spectral power ratio method and system for detecting drill bit failure and signaling surface operator. Halliburton Energy Services, Robert O Groover, January 27, 2004: US06681633 (33 worldwide citation)

An apparatus and method for monitoring and reporting downhole bit failure. Sensors are located on a sub assembly (which is separate from the drill bit itself but located above it on the drill string). Data from the sensors (preferably accelerometers) are collected in blocks, then analyzed in the fre ...


4
Roger L Schultz, Orlando De Jesus, Andrew J Osborne Jr: Internal power source for downhole detection system. Halliburton Energy Services, Robert Groover, February 17, 2004: US06691802 (31 worldwide citation)

A drill string is equipped with a downhole assembly having an instrumented sub and a drill bit. The instrumented sub has a power source that requires no electrical chemical batter. A mass-spring system is used, which during drilling causes a magnet to oscillate past a coil. This induces current whic ...


5
Roger L Schultz, Orlando De Jesus, Andrew J Osborne Jr: Adaptive filter prediction method and system for detecting drill bit failure and signaling surface operator. Halliburton Energy Svcs, Robert Groover, April 20, 2004: US06722450 (31 worldwide citation)

An apparatus and method for monitoring and reporting downhole bit failure. Sensors are located on a sub assembly (which is removable from the drill bit) and send data to neural net or other adaptive filter. The neural net uses past sensor readings to predict future sensor readings. The value predict ...


6
Roger L Schultz, Orlando De Jesus, Andrew J Osborne Jr: Method and apparatus for monitoring the condition of a downhole drill bit, and communicating the condition to the surface. Halliburton Energy Services, Robert O Groover III, April 15, 2008: US07357197 (25 worldwide citation)

A method and apparatus for signalling the surface operator about downhole conditions. Sensors located downhole collect data while drilling and the data is processed to determine bit failure, for example. When the sensor data indicates a failure, the pressure of drilling mud is varied using a valve o ...


7
Roger L Schultz, Orlando De Jesus, Andrew J Osborne Jr: Mean strain ratio analysis method and system for detecting drill bit failure and signaling surface operator. Groover & Holmes, November 16, 2004: US06817425 (24 worldwide citation)

An apparatus and method for monitoring and reporting downhole bit failure. Sensors are located on a sub assembly (which is separate from the drill bit itself but located above it on the drill string). Strain measurements are taken from the sensors to detect changes in induced bending and axial stres ...


8
James B Loeb, Andrew J Osborne Jr, Raul A Miglierini: Rotary drilling jar. Dresser, May 5, 1987: US04662460 (7 worldwide citation)

The rotary drilling jar includes inner and outer mandrels releaseably locked against relative longitudinal movement. The inner mandrel is connected to the drilling string and the outer mandrel is connected to the drill bit or other well tools suspended below the jar in the well bore. A detent mechan ...


9
Raul A Miglierini, Andrew J Osborne Jr: Roller cone bits with reduced packing. Halliburton Energy Services, Groover & Holmes, Robert O Groover, Patric C R Holmes, May 16, 2006: US07044242 (2 worldwide citation)

A roller-cone drill bit in which a large groove is machined into the backface of each cone, near the crack where the cone meets the arm assembly. By making the outer lip of this crack more exposed to the open volume of turbulent flow, turbulence near the crack is increased, deposit of sediments near ...


10
Andrew J Osborne Jr: Cutter assembly for a raise boring reamer. Atlas Copco Secoroc, Schmeiser Olsen & Watts, June 18, 2013: US08464813

A raise boring reamer assembly includes a saddle, and a journal assembly carried by the saddle. The journal assembly includes nose and gage shanks, and a cutter is carried by the journal assembly. Nose and gage wiper rings are positioned proximate to the nose and gage shanks, respectively. The nose ...