Discrimination of metallic targets in magnetically...

Distinguishing false signals in cable locating

Distinguishing false signals in cable locating using a...

Double-suspension receiver coil system and apparatus

Downhole induction resistivity tool

Downhole instrument including a flexible probe which can travel

Downhole multi-phase flow imager

Downhole spread spectrum induction instruments

Drill stem logging with electromagnetic waves and electrostatica

Drilling systems and methods using radial current flow for...

Drillpipe structures to accommodate downhole testing

Dual field metal detector

Dual field search coil for pulse induction metal detectors

Dual focused resistivity logging method and apparatus with dynam

Dual frequency well logging system for determining the water res

Dual guard type resistivity measuring apparatus

Dual-cone double-helical downhole logging device

Dynamic electromagnetic methods for direct prospecting for oil

Dynamic magnetic locator and method for the same