Method of treating formation to remove ammonium ions

Details Method of treating formation to remove ammonium ions Method of treating formation to remove ammonium ions

1978-04-20

1979-07-31

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166266, 166270, 166271, 166307, E21B 4322, E21B 4327, E21B 4328

Patent

active

041627075

ABSTRACT:
A method of treating a subterranean formation which has undergone an in situ leaching operation which utilzed an ammonium solution as the lixiviant. In such a leach operation, ammonium ions will exchange into the clay in the formation and will present a threat of contamination to any ground waters that may be present in the formation. The present method involves flushing the formation with a halogenated restoration fluid, e.g., chlorinated water having a halogen therein which reacts with ammonia within the formation to decompose the ammonia to nitrogen. The halogenated restoration fluid can be continuously injected or it can be injected as a slug followed by a relatively halogen-free solution to complete the operation. The ammonia concentration of the produced fluids is monitored and when it drops below a desired value, the method is complete.

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