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

1977-03-25

1978-03-21

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166270, 166273, 166305R, 299 4, E21B 4322

Patent

active

040797830

ABSTRACT:
A method of treating a subterranean formation which has undergone an in situ leaching operation which utilized an ammonium carbonate and/or bicarbonate lixiviant. In such a leach operation, ammonium ions will absorb onto 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 strong, basic solution, e.g., sodium or calcium hydroxide, to convert the ammonium ions to ammonia which is easily carried from the formation by the basic solution. After substantially all of the ammonium ions are removed, the formation is then flushed with water to remove any basic solution which may remain in the formation.

REFERENCES:
patent: 2161085 (1939-06-01), Phalen
patent: 3087539 (1963-04-01), Maurer, Jr.
patent: 3203480 (1965-08-01), Froning
patent: 3379249 (1968-04-01), Gilchrist et al.
patent: 4031959 (1977-06-01), Henderson

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