Impedance measuring method of and apparatus for detecting escapi

Details Impedance measuring method of and apparatus for detecting escapi Impedance measuring method of and apparatus for detecting escapi

1978-10-12

1981-02-24

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

324324, 324372, G01V 320, G01V 302

Patent

active

042530636

ABSTRACT:
In an in situ uranium leaching process, a method of detecting presence or absence of leach solution escaping from a desired leaching zone involves monitoring the electrical impedance of a zone just outside the desired zone to detect high ionic concentration indicative of leach solution. Electrical impedance is measured by locating monitor wells just outside the leaching zone and positioning pairs of current and voltage probes within the monitor wells and closest injection wells. Low frequency, constant current is generated by each pair of current probes between corresponding injection and monitor wells to develop a zone impedance-dependent voltage drop that is measured by each set of voltage probes and correlated to presence or absence of escaping leach solution. In an alternative embodiment, electrical impedances are measured between a single, central recovery well and a series of distributed, monitor wells to reduce the total number of probes required.

REFERENCES:
patent: 2183565 (1939-12-01), Hawley
patent: 2400593 (1946-05-01), Neufeld
patent: 3319158 (1967-05-01), McDoulett et al.
patent: 3496768 (1970-02-01), Boucher
patent: 3929011 (1975-12-01), Jones
patent: 4009609 (1977-03-01), Sayer et al.
patent: 4071278 (1978-01-01), Carpenter et al.

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