E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/29
E21B 43/22 (2006.01) E21B 43/28 (2006.01)
Patent
CA 1072878
METHOD OF TREATING FORMATION TO REMOVE AMMONIUM IONS F-9332 Abstract of the Disclosure 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. -1-
298928
Singleton Herbert P.
Snavely Earl S.
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