Long life oil well logging assembly
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United States of America Patent
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Aug 20, 1996
Grant Date -
N/A
app pub date -
Mar 1, 1994
filing date -
Mar 1, 1994
priority date (Note) -
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Abstract
A well logging scintillation detector has a gamma ray detector crystal with a window at one end and a single or multi-layer cladding surrounding the remainder of the crystal, with a reflective layer surrounding the cladding. The reflective layer, which may be a thin, high reflective metallic layer or reflective particles in a resin matrix, is surrounded by an elastomer with reflective particles which is surrounded by a casing which is a metal. The casing is surrounded by one or more outer casings, which are separated from each other by elastomeric members. A resilient base is formed opposite the window. The window has a flat glass plate connected to the crystal with an optical coupler, and a clear elastomer optically coupled to the plate. A larger plate is optically coupled to the elastomer, and the larger plate is sealed to one or more of the outer casings by inter-fitted corrugated rings of glass and metal which entrap epoxy, which fills the corrugations. Inner rings contain silica gel, which prevent any moisture from entering the crystal area and reducing reflectivity of its coatings.
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