Oil-based flushed zone electromagnetic well logging system and m

Passive, active and semi-active cancellation of borehole...

Permanently emplaced electromagnetic system and method for...

Plural coil induction device and method for determining in a bor

Plural sensor magnetometer arrangement for extended lateral rang

Process for the production of a supply current of a solenoid for

Propagation anisotropic well logging system and method

Propagation based electromagnetic measurement of anisotropy...

Pulsed electromagnetic dipmeter method and apparatus employing c

Pulsed field system for detecting the presence of a target in a

Pulsed induction logging for determining conductivity and invade

Pulsed induction logging for determining invaded zone properties

Radio geophysical surveying method and apparatus

Radio system for characterizing and outlining underground...

Receiver electronics proximate antenna

Removing effects of near surface geology from...

Replaceable antennas for wellbore apparatus

Resistivity antenna shield, wear band and stabilizer assembly fo

Resistivity receiver spacing

Resistivity tool with selectable depths of investigation