Boots – shoes – and leggings
Patent
1987-04-27
1992-10-20
Hayes, Gail O.
Boots, shoes, and leggings
324335, 324339, G01V 318
Patent
active
051576058
ABSTRACT:
Induction logging apparatus is disclosed which depends for its operation not only upon its arrangement of coils, but also upon the skin depth of the formation. The skin effect of the formation is used advantageously by operating a simple induction sonde at a plurality of frequencies simultaneously. Improved depth of investigation and improved vertical resolution result from the invention. Simple arrays are disclosed for the induction logging apparatus. A sonde with a single transmitter and a plurality of two-coil receiver arrays are preferred. The apparatus acquires both the in-phase and quadrature components of each receiver array signal at several frequencies. The response function is shaped by using a multi-channel deconvolution filter.
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"Invasion Profile From the Digital Induction Log", P. A. S. Elkington and H. K. Patel, BPB Instruments, East Leake, Loughborough, LE12 6JQ, England.
"Digital Induction Sonde", by Peter Elkington and Hermant Patel, BPB Integrated Digital System.
Chandler Richard N.
Rosthal Richard A.
Bouchard John H.
Garrana Henry N.
Hayes Gail O.
Schlumberger Technology Corporation
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