Inventor
FERTL WALTER H
US21 patents
⚠️ This page may combine multiple inventors who share the name “FERTL WALTER H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
DRESSER IND
14 patentsUS4415805ANov 15, 1983
Method and apparatus for evaluating multiple stage fracturing or earth formations surrounding a borehole
DRESSER IND91 citations95
US4507553AMar 26, 1985
Method and apparatus for identifying vanadium in earth formations
DRESSER IND22 citations81
US4399359AAug 16, 1983
Method for monitoring flood front movement during water flooding of subsurface formations
DRESSER IND25 citations79
US4346592AAug 31, 1982
Method for determining effective reservoir porosity
DRESSER IND19 citations78
US4263509AApr 21, 1981
Method for in situ determination of the cation exchange capacities of subsurface formations
DRESSER IND24 citations76
US4622849ANov 18, 1986
Method and apparatus for determining characteristics of clay-bearing formations
DRESSER IND13 citations73
US4178506ADec 11, 1979
Method for detecting fractures in formations surrounding earth boreholes
DRESSER IND14 citations73
US4173718ANov 6, 1979
Method for monitoring fluid movement behind casing in oil and gas wells
DRESSER IND12 citations73
US4484470ANov 27, 1984
Method and apparatus for determining characteristics of clay-bearing formations
DRESSER IND8 citations72
US4187908AFeb 12, 1980
Method for ascertaining optimum location for well stimulation and/or perforation
DRESSER IND19 citations72
US4594887AJun 17, 1986
Method and apparatus for determining characteristics of clay-bearing formations
DRESSER IND14 citations67
US4617517AOct 14, 1986
Determination of water saturation in earth formations independent of lithology
DRESSER IND4 citations62
US4494071AJan 15, 1985
Determination of water saturation in earth formations independent of lithology
DRESSER IND5 citations62
US4636994AJan 13, 1987
Method of determining shear wave travel time in subsurface formations
DRESSER IND4 citations59
CONTINENTAL OIL CO
4 patentsUS3949220AApr 6, 1976
Method for detecting and locating sand producing zones in friable, unconsolidated sandstone formations of subterranean formations
CONTINENTAL OIL CO7 citations74
US3940612AFeb 24, 1976
Method for detecting and locating water-producing zones and/or water thief zones in subterranean formations
CONTINENTAL OIL CO4 citations63
US4118623AOct 3, 1978
Continuous quality control of mined hard and soft coals
CONTINENTAL OIL CO4 citations60
US4115688ASep 19, 1978
Mining and drilling control of distance to the coal-shale interface - thorium measurement by gamma spectrometry
CONTINENTAL OIL CO5 citations60
WESTERN ATLAS INT INC
3 patentsUS4953399ASep 4, 1990
Method and apparatus for determining characteristics of clay-bearing formations
WESTERN ATLAS INT INC50 citations92
US4756189AJul 12, 1988
Method and apparatus for determining characteristics of clay-bearing formations
WESTERN ATLAS INT INC17 citations74
US4700140AOct 13, 1987
Determination of water or residual oil saturation in earth formations independent of lithology
WESTERN ATLAS INT INC4 citations62