Method for restoring contaminants to base levels in previously l

Details Method for restoring contaminants to base levels in previously l Method for restoring contaminants to base levels in previously l

1982-05-27

1983-12-06

Suchfield, George A.

Mining or in situ disintegration of hard material

In situ conversion of solid to fluid

Dissolving or chemical reaction

299 4, E21B 4328

Patent

active

044189613

ABSTRACT:
The present invention relates to a method for restoring to environmentally acceptable levels the soluble contaminants in a subterranean formation that has been subjected to oxidative leaching. The contaminants are defined as those ionic species that when subjected to calcium ions form precipitates which are insoluble in the formation fluids. In accordance with the present invention, soluble calcium values are introduced into the formation. The level of contaminants is monitored and when such reaches the desired level, the introduction of soluble calcium values is stopped. The introduction of calcium values may be achieved in several ways one of which is to inject into the formation an aqueous solution containing therein solubilized calcium values. Another method of introducing calcium values into a formation, is to inject into the formation an aqueous solution containing carbon dioxide to solubilize calcium values, such as calcium carbonates, found in the formation.

REFERENCES:
patent: 3091291 (1963-05-01), Little et al.
patent: 3309141 (1967-03-01), Fitch et al.
patent: 4105253 (1978-08-01), Showalter
patent: 4134618 (1979-01-01), Kossack
patent: 4155982 (1979-05-01), Hunkin et al.
patent: 4234231 (1980-11-01), Yan
patent: 4291920 (1981-09-01), Lingane et al.
Yan, "Calcite Control in In-Situ Uranium Leaching Process", Journal of Petroleum Technology, Nov. 1980, pp. 2068-2073.

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