Andrew J. Hayman

Formation imaging while drilling in non-conductive fluids

Determining impedance of material behind a casing in a borehole

Method and apparatus for investigating the wall of a borehole

Conductive pad around electrodes for investigating the wall of a borehole in a geological formation

Phase discrimination for micro electrical measurement in non-conductive fluid

Method and apparatus for imaging earth formation

Logging sonde for electrically exploring geological formations through which a borehole passes

Tool for imaging a downhole environment

System and method for imaging properties of subterranean formations

Method and a tool for electrically investigating a wall of a borehole in a geologic formation