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 frequency well logging system for determining the water res

Dual-cone double-helical downhole logging device

Dynamic electromagnetic methods for direct prospecting for oil

Efficient simultaneous electromagnetic transmission or reception

Electric power grid induced geophysical prospecting method...

Electric power grid induced geophysical prospecting method...

Electromagnetic and magnetostatic shield to perform...

Electromagnetic field method of detecting contemporary geodynami

Electromagnetic formation evaluation tool

Electromagnetic induction method and apparatus for the...

Electromagnetic induction well logging instrument having...

Electromagnetic instruments for imaging structure in geologic fo

Electromagnetic logging apparatus using vertical magnetic dipole

Electromagnetic logging apparatus with button antennas for measu

Electromagnetic logging apparatus with slot antennas

Electromagnetic logging device and method with dielectric guidin