Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1984-02-01
1986-03-25
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
G01V 330
Patent
active
045786453
ABSTRACT:
An electromagnetic borehole logging tool has at least two antenna arrays positioned at spaced-apart locations along the longitudinal axis of the borehole tool. Each antenna array has at least three sub arrays spaced approximately equally around the longitudinal axis of the tool. Each sub array has at least one antenna for transmitting and receiving electromagnetic energy. The three sub arrays of the first of the two antenna arrays are respectively located at approximately the same circumferential positions around the longitudinal axis of the tool as the three sub arrays of the second of the two antenna arrays. Each of the sub arrays transmits electromagnetic energy into the formations surrounding the borehole and receives electromagnetic energy upon its return to the borehole from such formations.
REFERENCES:
patent: 3388323 (1968-06-01), Stripling
patent: 3849721 (1974-11-01), Calvert
patent: 3944910 (1976-03-01), Rau
patent: 4092583 (1978-05-01), Coates
patent: 4107597 (1978-08-01), Meador et al.
patent: 4383220 (1983-05-01), Baldwin
patent: 4511842 (1985-04-01), Moran et al.
"Electromagnetic Propagation . . . A New Dimension in Logging", Society of Petroleum Engineers of AIME, Paper No. SPE 6542, by T. J. Calvert and R. N. Rau, 1977.
Gilman Michael G.
Hager Jr. George W.
McKillop A. J.
Mobil Oil Corporation
Strecker Gerard R.
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