Wells – Processes – Separate steps of fracturing or attacking formation
Patent
1980-03-24
1981-04-14
Novosad, Stephen J.
Wells
Processes
Separate steps of fracturing or attacking formation
166300, 166307, E21B 33138, E21B 4327
Patent
active
042614210
ABSTRACT:
The less permeable zones of subterranean formations having temperatures above about 250.degree. F. are acidized by selectively plugging the more permeable zones with acid-soluble particulate diverting agents and then injecting a substantially anhydrous acid precursor into the formation. The acid precursor, which is a normally liquid halogenated hydrocarbon having one or two carbon atoms per molecule, hydrolyzes in situ to generate a hydrohalic acid. Subsequent to the placement of the acid precursor in the less permeable zones, the diverting agents may be solubilized in acid, such as the partially spent acid returning to the well.
REFERENCES:
patent: 1916122 (1933-06-01), Grebe
patent: 2059459 (1936-11-01), Hund
patent: 2124530 (1938-07-01), Loomis et al.
patent: 2259428 (1941-10-01), Shelly
patent: 2265923 (1941-12-01), Normand
patent: 2300393 (1942-11-01), Ayers
patent: 2358665 (1944-09-01), Shapiro
patent: 2663689 (1953-12-01), Kingson et al.
patent: 2765851 (1956-10-01), Bond
patent: 3215199 (1965-11-01), Dilgren
patent: 3288216 (1966-11-01), Blickensderfer et al.
patent: 3297090 (1967-01-01), Dilgren
patent: 3307630 (1967-03-01), Dilgren et al.
patent: 3379249 (1968-04-01), Gilchrist et al.
patent: 3481398 (1969-12-01), Prats
patent: 3543856 (1970-12-01), Knox et al.
patent: 3547197 (1970-12-01), Chevalier et al.
patent: 3605899 (1971-09-01), Tate et al.
patent: 3695354 (1972-10-01), Dilgren et al.
patent: 3828854 (1974-08-01), Templeton et al.
patent: 3868998 (1975-03-01), Lybarger et al.
patent: 3938593 (1976-02-01), Friedman
patent: 4027731 (1977-06-01), Smith et al.
Thomas et al., "Matrix Treatment Employs New Acid System for Stimulation and Control of Fines Migration in Sandstone formations", Paper SPE 7566, Oct. 1978.
Farrell Daniel R.
Novosad Stephen J.
Sandford Dean
Suchfield George A.
Union Oil Company of California
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