Schlumberger Technology Corporation

Paal Bratland

Rolf Rustad

Jean-Francois Noel

A gamma densitometer window is provided along with a method of fabrication thereof. The window comprises a plate of non-metallic, preferably gamma transparent, material having a first face and a second face opposing one another and having an outer edge defined therebetween. The window further comprises a metallic frame member fitted around the outer edge of the plate and adapted to pre-load the plate with a compressive stress that is sufficiently high such that the sum of the compressive stress, tensile stress and shear stress components generated in the plate under high-pressure conditions is always compressive. The method of fabrication shrink fitting the metallic frame member around the outer edge of the plate at a shrink-fit temperature such that the metallic frame member applies a compressive stress to the plate at any temperature below the shrink-fit temperature.

Pre-stressed gamma densitometer window and method of fabrication

A gamma densitometer window comprises a plate of non-metallic, preferably gamma transparent, material. The window further comprises a metallic frame member fitted around the outer edge of the plate and adapted to pre-load the plate with a compressive stress that is sufficiently high such that the sum of the compressive stress, tensile stress and shear stress components generated in the plate under high-pressure conditions is always compressive. The window is fabricated by shrink fitting the metallic frame member around the outer edge of the plate at a shrink-fit temperature such that the metallic frame member applies a compressive stress to the plate at any temperature below the shrink-fit temperature.

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Bergen, Norway

Paal Bratland