Well bore apparatus arranged for operating in high-temperature w

Details Well bore apparatus arranged for operating in high-temperature w Well bore apparatus arranged for operating in high-temperature w

1988-07-05

1989-10-10

Kisliuk, Bruce M.

Wells

With heating, refrigerating or heat insulating means

166242, 73154, 250261, E21B 3600

Patent

active

048725072

ABSTRACT:
In a preferred embodiment of the new and improved well tool that is described herein, a set of alternate outer tool housings are respectively arranged for carrying a common inner assembly having one or more temperature-sensitive devices. The new and improved set of alternative housings includes a first tubular housing having a solid wall of a steel of sufficient strength and thickness to withstand a predetermined pressure and a second tubular housing having inner and outer tubular members coaxially arranged to provide a hollow wall having substantially equal external and internal diameters as the first housing and which is formed of a steel of sufficiently greater strength than the steel in the first housing so that the second housing will have a design pressure rating about equal to the predetermined pressure. The coaxially-arranged tubular members are joined at their opposite ends for defining an annular space between the inner and outer members that is evacuated and sealed to provide significant thermal insulation for the one or more temperature-sensitive devices when the inner assembly is disposed in the second housing.

REFERENCES:
patent: 4313317 (1982-02-01), Janssen et al.
patent: 4440219 (1984-04-01), Engelder
patent: 4694166 (1987-09-01), Gearhart

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