Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1991-10-04
1992-10-20
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324369, 343873, G01V 330, E21B 4900, H01Q 140
Patent
active
051573318
ABSTRACT:
In an electromagnetic propagating antenna circumferential groove disposed in an MWD resistivity tool mandrel and normally sealed with an epoxy resin non-conducting material forming an annular ring disposed in each of the plurality of circumferential grooves through which the electromagnetic energy from the antenna coil will propagate from the mandrel, each of the circumferential grooves comprises a pair of sidewalls interconnected by an annular flat base portion, each of the sidewalls further having disposed therein a plurality of circumferentially-spaced and longitudinally-disposed slots of uniform size having an open end communicating with each of the sidewalls and a closed end terminating longitudinally spaced from each of the sidewalls for forming a "zipper slot" configuration to the plurality of circumferential grooves, wherein the surface area of all of the plurality of zipper slots is preselected for cooperating with the surface area of each of the circumferential grooves for increasing the surface area of the grooves for permitting greater electromagnetic wave propagation from each of the antenna coils. In addition, the zipper slot configuration of the plurality of circumferential grooves cooperates with the annular ring of non-conducting materials disposed therein for mechanically enhancing the bond between the material and the mandrel and preventing displacement of the annular ring with respect to the zipper slot circumferential groove during operation in the borehole.
REFERENCES:
patent: 4461997 (1984-07-01), Ohmer
patent: 4785247 (1988-11-01), Meador et al.
patent: 4940943 (1990-07-01), Bartel et al.
Springs Darryl M.
Strecker Gerard R.
Western Atlas International Inc.
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