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Primary Examiner: Novosad, Stephen J.
Assistant Examiner: Suchfield, George A.
Attorney: Sanford; Dean, Farrell; Daniel R.

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Title: Method for acidizing siliceous materials contained in high temperature formations

Abstract: An aqueous fluoride salt solution and a substantially anhydrous acid precursor are introduced through a well into a high temperature subterranean formation containing siliceous materials. The acid precursor, which is a normally liquid halogenated hydrocarbon having one or two carbon atoms, hydrolyzes in situ to generate a hydrohalic acid which combines with the fluoride salt to acidize the siliceous materials.

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Inventors: Watanabe, David J. (Orange, CA, US)

Application Number: 014054
Filing Date: 1979-02-22
Publication_date: 1980-05-20
Assignee: Union Oil Company of California (Brea, CA)
Primary Class(es): 166/300 166/307, 166/308.2, 507/203, 507/205, 507/933
Other Classes:
US Patent Ref:

1916122	Jun, 1933	Grebe.
2059459	Nov, 1936	Hund et al.
2124530	Jul, 1938	Loomis et al.
2259428	Oct, 1941	Shelley.
2265923	Dec, 1941	Normand.
2300393	Nov, 1942	Ayers.
2358665	Sep, 1944	Shapiro.
2663689	Dec, 1953	Kingston et al.
2765851	Oct, 1956	Bond.
3215199	Nov, 1965	Dilgren.
3288216	Nov, 1966	Blickensderfer et al.
3297090	Jan, 1967	Dilgren	166/307.
3307630	Mar, 1967	Dilgren et al.
3379249	Apr, 1968	Gilchrist et al.
3481398	Dec, 1969	Prats	166/251.
3605899	Sep, 1971	Tate et al.	166/300.
3695354	Oct, 1972	Dilgren et al.	166/272.
3828854	Aug, 1974	Templeton et al.	166/307.
3868998	Mar, 1975	Lybarger et al.	166/278.
3938593	Feb, 1976	Friedman	166/307.
4027731	Jun, 1977	Smith et al.	166/267.
4136739	Jan, 1979	Salathiel et al.	166/300.

Other Refs: Other References: Thomas et al., "Matrix Treatment Employs New Acid System for Stimulation and Control of Fines Migration in Sandstone Formations," SPE Paper 7566, Oct. 1978.