E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/39
E21B 43/24 (2006.01)
Patent
CA 1241273
ABSTRACT OF THE DISCLOSURE A method is disclosed for inhibiting silica dissolution during steam injection into a formation. In the method, there is added to the steam, or to feedwater used to generate the steam, a mixture comprising: (a) a compound selected from the group consisting of ammonium salts of inorganic acids, ammonium salts of carboxylic acids, quaternary ammonium halides, amine or substituted amine hydrochlorides, and mixtures thereof; and (b) a compound selected from the group consisting of ammonia, salts which decompose in steam to form acid neutralizers or buffers having alkaline pH values, amides of carbamic acid or thiocarbamic acid and derivatives of such amides, tertiary carboxylic acid amides and their substituted and alkylated derivatives, and mixtures thereof. In steam, the compound of (a) decomposes to form a proton, which neutralizes hydroxide generated by ions in the steam generator feedwater. The compound of (h) neutralizes or buffers the steam to prevent acidic pH values which would be obtained from overtreatment with compound (a) above.
493587
Fetherstonhaugh & Co.
Union Oil Company Of California
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