Well logging tool for hot well bores

Details Well logging tool for hot well bores Well logging tool for hot well bores

1985-10-18

1986-12-16

Howell, Janice A.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250267, 62260, G01V 500

Patent

active

046298886

ABSTRACT:
Apparatus for insulating enclosed electronic devices against damaging temperatures when used in deep, hot well bores. Includes a first vacuum chamber insulating means defined by outer casing of well-logging tool and inner casing. First vacuum chamber defines a components chamber to shield contents against the temperature in a well bore. A second vacuum chamber mounted within components chamber is defined by an outer tube and an inner tube. Outer tube has a thickened wall and is of material suited to serve as heat sink within components chamber. Second vacuum chamber defines detection chamber to shield contents against the temperature within components chamber. Thickened wall is undercut to define a thin wall adapted to function as a window for radiation to pass from an earth formation outside said logging tool into a radiation detector disposed within said detection chamber. Further includes radiation screen located in said undercut and around said window to shield said detector means from radiation below a selected level of energy.

REFERENCES:
patent: 2862106 (1958-11-01), Scherbatskoy
patent: 4503327 (1985-03-01), Wilson

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