Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1987-02-19
1989-05-23
Fields, Carolyn E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
2503571, 378 86, G01V 512, G01F 2300
Patent
active
048333212
ABSTRACT:
This invention relates to a system for monitoring, in a cavity in the earth, the position of, or changes in the position of, an interface between two immiscible liquids of different densities. In accordance with the invention, two pipes, one positioned within the other to form a space between them, extends into the cavity in the earth. A probe is mounted on the outer wall of the inner pipe and is vertically positioned near the interface to be monitored. The probe includes an emitting source and a detector-receiver and readings are taken of signals received by the detector after emission by the source and at least partially reflected by at least one of the liquids. From the readings the position of or change in interface may be computed since the signal reading will vary as a function of the relative position of the probe and the interface. The invention may be applied to the monitoring of excavations of underground salt cavities.
REFERENCES:
patent: 2565963 (1951-08-01), Gragham
patent: 2775121 (1956-12-01), Bennett et al.
patent: 2972679 (1961-02-01), Caldwell et al.
Bonnaure Christian
Lioret Jean-Claude
Fields Carolyn E.
Gaz de France
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