Directional gamma ray spectrometer
Doubly-compensated dual-detector density logging apparatus
Down hole gas analyzer method and apparatus
Down-hole probe assemblies
Downhole carbon dioxide gas analyzer
Downhole device to detect differences in fluid density
Downhole fluid spectroscopy
Downhole gamma-ray detection
Downhole sensing with fiber in exterior annulus
Dual compensated chlorine logging tool
Dual detector pulsed neutron logging for providing indication of
Dual spaced, borehole compensated neutron well logging instrumen
Dual spectra well logging system and method
Dual spectra well logging system and method