Abstract
ABSTRACT A new fines stabilizing method which prevents migration of clay and non-clay siliceous fines, and controls formation dissolution during sandstone acidizing, has been developed. The method employs an organosilane compound which can be added directly to acid mixtures, such as hydrochloric (HC1) and hydrochloric-hydrofluoric (HC1-HF) acid. The organosilane additive reacts in situ to stabilize potentially mobile siliceous fines, and as an additive to HC1-HF acid mixtures, reduces the potentially damaging effects of excessive mineral dissolution by HF. This paper describes the use of and the mechanism by which the organosilane acid additive stabilizes fines, and reduces dissolution of sandstone by HF acid. Results of laboratory core flow tests which show the beneficial effects of employing both a proper HF acid concentration and the organosilane fines-fixing agent are presented. Results of a field test are also presented.
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