G - Physics – 01 – V
Patent
G - Physics
01
V
324/9
G01V 3/18 (2006.01)
Patent
CA 1088624
ELECTROMAGNETIC WAVE PROPAGATION WELL LOGGING UTILIZING MULTIPLE PHASE SHIFT MEASUREMENT (D74,695 -F) Abstract of the Disclosure The invention disclosed herein includes methods and apparatus for determining true formation resistivity, flushed zone resistivity and invasion diameter of the earth formation in the vicinity of a well borehole. A radio frequency electromagnetic field in the frequency range from 800 kilohertz to 4 megahertz is generated in a borehole and the electromagnetic field is detected at a plurality of longitudinally spaced locations. Measurements of the attenuation and propagation velocity of the electromagnetic wave at the longitudinally spaced receivers may then be interpreted according to predetermined relationships in terms of the formation resistivity, flushed zone resistivity and invasion diameter surrounding the borehole. -1-
303877
Adams Larry L.
Cox Percy T.
Fuchs James A.
Meador Richard A.
Thompson Larry W.
Smart & Biggar
Texaco Development Corporation
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