Containers for indicators

Details Containers for indicators Containers for indicators

1977-05-31

1979-04-17

Novosad, Stephen J.

Wells

With time or distance measuring, temperature responsive or...

166164, 166251, 299 2, E21B 4324, E21B 4700

Patent

active

041495926

ABSTRACT:
An apparatus is provided for determining the locus of a processing zone which advances through a fragmented permeable mass of particles in an in situ oil shale retort in a subterranean formation containing oil shale. The apparatus, which functions by releasing means for providing an indicator at a preselected temperature, comprises container means, means for providing an indicator in the container, and means for releasing the indicator providing means at a selected temperature greater than ambient.

REFERENCES:
patent: 2658724 (1953-11-01), Arps
patent: 3011566 (1961-12-01), Graham
patent: 3057405 (1962-10-01), Mallinger
patent: 3072184 (1963-01-01), Parker
patent: 3116450 (1963-12-01), Longwill
patent: 3155176 (1964-11-01), Bennett
patent: 3678883 (1972-07-01), Fischer

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