Assignee
ANADRILL INC
US24 patents
Top patents by PatentIndex Score
US5092687AMar 3, 1992
Diamond thrust bearing and method for manufacturing same
ANADRILL INC524 citations99
US5253939AOct 19, 1993
High performance bearing pad for thrust bearing
ANADRILL INC110 citations96
US5063776ANov 12, 1991
Method and system for measurement of fluid flow in a drilling rig return line
ANADRILL INC83 citations96
US4847815AJul 11, 1989
Sinusoidal pressure pulse generator for measurement while drilling tool
ANADRILL INC111 citations96
US4833914AMay 30, 1989
Pore pressure formation evaluation while drilling
ANADRILL INC85 citations96
US5139094AAug 18, 1992
Directional drilling methods and apparatus
ANADRILL INC158 citations95
US4949575AAug 21, 1990
Formation volumetric evaluation while drilling
ANADRILL INC61 citations95
US5275040AJan 4, 1994
Method of and apparatus for detecting an influx into a well while drilling
ANADRILL INC62 citations94
US5154078AOct 13, 1992
Kick detection during drilling
ANADRILL INC90 citations94
US5033557AJul 23, 1991
Hydraulic drilling jar
ANADRILL INC71 citations94
US4887464ADec 19, 1989
Measurement system and method for quantitatively determining the concentrations of a plurality of gases in drilling mud
ANADRILL INC133 citations94
US4805449AFeb 21, 1989
Apparatus and method for measuring differential pressure while drilling
ANADRILL INC110 citations94
US4739841AApr 26, 1988
Methods and apparatus for controlled directional drilling of boreholes
ANADRILL INC87 citations94
US5267398ADec 7, 1993
Method for manufacturing a diamond thrust bearing
ANADRILL INC37 citations93
US5181576AJan 26, 1993
Downhole adjustable stabilizer
ANADRILL INC76 citations93
US4958125ASep 18, 1990
Method and apparatus for determining characteristics of the movement of a rotating drill string including rotation speed and lateral shocks
ANADRILL INC123 citations93
US5146433ASep 8, 1992
Mud pump noise cancellation system and method
ANADRILL INC83 citations92
US4760735AAug 2, 1988
Method and apparatus for investigating drag and torque loss in the drilling process
ANADRILL INC84 citations92
US4941951AJul 17, 1990
Method for improving a drilling process by characterizing the hydraulics of the drilling system
ANADRILL INC71 citations91
US4876886AOct 31, 1989
Method for detecting drilling events from measurement while drilling sensors
ANADRILL INC69 citations89
US4956921ASep 18, 1990
Method to improve directional survey accuracy
ANADRILL INC56 citations88
US4852399AAug 1, 1989
Method for determining drilling conditions while drilling
ANADRILL INC75 citations86
US4976143ADec 11, 1990
System and method for monitoring drill bit depth
ANADRILL INC55 citations82
US4981036AJan 1, 1991
Method of determining the porosity of an underground formation being drilled
ANADRILL INC17 citations73