Inventor
ELLIS DARWIN V
US12 patents
⚠️ This page may combine multiple inventors who share the name “ELLIS DARWIN V”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SCHLUMBERGER TECHNOLOGY CORP
10 patentsUS4423323ADec 27, 1983
Neutron logging method and apparatus for determining a formation characteristic free of environmental effects
SCHLUMBERGER TECHNOLOGY CORP88 citations96
US4810876AMar 7, 1989
Logging apparatus and method for determining absolute elemental concentrations of subsurface formations
SCHLUMBERGER TECHNOLOGY CORP63 citations95
US4048495ASep 13, 1977
Doubly-compensated dual-detector density logging apparatus
SCHLUMBERGER TECHNOLOGY CORP101 citations95
US5390115AFeb 14, 1995
Compensated gamma-gamma density sonde using three detectors
SCHLUMBERGER TECHNOLOGY CORP57 citations94
US7292942B2Nov 6, 2007
Measuring formation density through casing
SCHLUMBERGER TECHNOLOGY CORP28 citations86
US7279677B2Oct 9, 2007
Measuring wellbore diameter with an LWD instrument using compton and photoelectric effects
SCHLUMBERGER TECHNOLOGY CORP18 citations76
US4816674AMar 28, 1989
Determining a formation porosity from neutron logging information
SCHLUMBERGER TECHNOLOGY CORP12 citations73
US4645927AFeb 24, 1987
Clay type and volume evaluation
SCHLUMBERGER TECHNOLOGY CORP9 citations73
US4542292ASep 17, 1985
Correction of natural gamma radiation logs for the effects of gamma ray emission from and attenuation by the borehole fluid
SCHLUMBERGER TECHNOLOGY CORP12 citations73
US6552334B2Apr 22, 2003
Wellbore caliper measurement method using measurements from a gamma-gamma density
SCHLUMBERGER TECHNOLOGY CORP6 citations54