Formation density logging MWD apparatus

Formation density logging using multiple detectors and sources

Formation density measurement apparatus and method

Formation density measurement utilizing pulse neutrons

Formation density sensor having detector array and method of cal

Formation density tool for use in cased and open holes

Formation density well logging tool with detector array for comp

Formation evaluation combination system for petrophysical...

Formation evaluation through azimuthal tool-path identification

Formation sigma measurement from thermal neutron detection

Four-detector formation-density tool for use in cased and open h

Gain stabilized natural gamma ray detection of casing thickness

Gamma ray borehole logging method and apparatus having compensat

Gamma ray detectors having improved signal-to-noise ratio...

Gamma ray measurement of earth formation properties using a posi

Gamma ray measurement of earth formation properties using a posi

Gamma ray spectral tool for borehole use

Gamma ray spectral tool for well logging

Gamma spectrum porosity measurement

Gamma-gamma density logging method