Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1992-06-15
1993-11-09
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324347, 324366, 324369, G01V 328, G01V 318
Patent
active
052606627
ABSTRACT:
The method and apparatus relies on a modified induction approach and preferably is incorporated into a metal drill collar for MWD measurements. A primary changing magnetic field is formed in a formation by a transmitting antenna which is in a groove on the surface of a drilling collar. Such drill collar also carries a plurality of detecting antennas and/or current detectors which detect the value of current induced in the formation to provide a resistivity profile immediately adjacent the borehole. An embodiment uses a hybrid modified induction and electrical approach.
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Baker Hughes Incorporated
Edmonds Warren S.
Strecker Gerard R.
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