Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1986-04-22
1989-07-25
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324366, G01V 320
Patent
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: 4523148 (1985-06-01), Maciejewski
Chew Weng C.
Marzetta Thomas L.
Edmonds Warren S.
Eisenzopf Reinhard J.
Lee Peter Y.
Schlumberger Technology Corporation
Steward St. Onge
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