Method and apparatus for insulating electrical devices in a logg

Details Method and apparatus for insulating electrical devices in a logg Method and apparatus for insulating electrical devices in a logg

1990-12-12

1992-07-21

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

G01V 328

Patent

active

051326248

ABSTRACT:
A method for providing electrical insulation to electrical devices (e.g. connectors) disposed at the end of the housing of a logging sonde designed to be lowered in a borehole traversing earth formation, wherein the housing is at least partly filled in with an insulating fluid having a density greater than the borehole fluid density. Advantageously, the insulating fluid density is greater than the density of water. Preferably, the housing is filled with a mix of insulating oil and hydraulic oil having a density less than the insulating oil density. The amount of insulating fluid is such that it covers the electrical devices when the sonde is substantially in the upright position. The insulating fluid is e.g. made of a fluorinated organic compound, such as the oil sold under the name Fluorinert.RTM. (trademark of 3M).

REFERENCES:
patent: 3719918 (1973-03-01), Kerr
patent: 4598967 (1986-07-01), White
patent: 4651101 (1987-03-01), Barber et al.
patent: 4701712 (1987-10-01), Seeley et al.
patent: 4767349 (1988-08-01), Pottier et al.
patent: 4817437 (1989-04-01), Dennis et al.
patent: 4872507 (1989-10-01), Ronco, Sr. et al.

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