Method and apparatus for investigating a borehole using an array

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports

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324366, G01V 320

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active

048517810

ABSTRACT:
A method and apparatus investigating a circumferential segment of a borehole with an array of elements, which in effect spatially samples the segment, is described whereby, with a single circumferentially oriented array of spaced-apart elements sufficient overlap can be synthesized so as to reduce artifacts attributable to the spatial sampling. Measurements derived from circumferentially successive elements are combined, such as by summing to establish a desired overlap. In the described embodiment to a single lateral array of small electrodes is used to inject survey currents into the borehole wall and each current is measured. Measurements derived from pairs of successive survey currents are then summed to provide the desired overlap.

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patent: 4286218 (1981-08-01), Bloomquist et al.
patent: 4468623 (1984-08-01), Gianzero et al.
patent: 4523148 (1985-06-01), Maciejewski

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