E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/29, 31/33
E21B 43/22 (2006.01) C09K 8/74 (2006.01) E21B 43/28 (2006.01) E21B 43/40 (2006.01)
Patent
CA 1102541
Abstract of the Disclosure A method of treating a subterranean formation which has undergone an in situ leaching operation which utilized 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. -1-
322033
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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