Conductivity method and apparatus for measuring strata resistivi

Details Conductivity method and apparatus for measuring strata resistivi Conductivity method and apparatus for measuring strata resistivi

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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