Inductive logging system having multiple coils from which are se

Details Inductive logging system having multiple coils from which are se Inductive logging system having multiple coils from which are se

1996-01-11

1998-04-07

O'Shea, Sandra L.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

321341, G01V 328

Patent

active

057368600

ABSTRACT:
A well logging system using an induction measurement. The system includes an emitting coil and a plurality of receiving coils. The emitting coil induces eddy currents in the medium surrounding the coils. The receiving coils then measure magnetic fields produced by the eddy currents. Two of the receiving coils are selected at a time and used as a receiving coil and a counter-receiving coil. The signal generated in the two coils are used to determine a weighted difference to better define the vertical resolution of the device. Compensation coils may be added to remove fields which are induced in the receiving coils directly from the transmitting coil.

REFERENCES:
patent: 4278941 (1981-07-01), Freedman
patent: 4622518 (1986-11-01), Cox et al.
patent: 4837517 (1989-06-01), Barber
patent: 5065099 (1991-11-01), Sinclair et al.
patent: 5157605 (1992-10-01), Chandler et al.

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