Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-07-29
1976-06-22
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01V 300, G01V 318
Patent
active
039654133
ABSTRACT:
In accordance with the present invention, the polarity of the remanent magnetization of an earth formation penetrated by a bore hole is accurately determined utilizing a highly sensitive magnetometer positioned within the bore hole in a direction S within the bore hole. The magnetometer is positioned such that its response direction remains parallel to the S direction at a plurality of logging stations along the vertical extent of the bore hole. The magnetometer can be oriented at the earth's surface, or in situ, to assume a posture which will place the magnetometer in the aforementioned position at a given logging depth. The response measured is the intensity of the total contribution from the remanent and induced magnetization of the formations adjacent to the well bore. In order to determine the remanent magnetization contribution, elimination of the induced magnetization contribution is provided, as by: (i) determining the amplitude of the earth's field in the S direction, (ii) determining the magnetic susceptibility at each logging station and (iii) subtracting the induced magnetization contribution from the total magnetization contribution.
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Chevron Research Company
Freeland, Jr. R. L.
Messner H. D.
Strecker Gerard R.
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