Product and process for acid diversion in the treatment of subte

Details Product and process for acid diversion in the treatment of subte Product and process for acid diversion in the treatment of subte

1991-09-10

1993-04-20

Suchfield, George A.

Wells

Processes

Separate steps of fracturing or attacking formation

166294, 166307, 166309, E21B 33138, E21B 4327

Patent

active

052034135

ABSTRACT:
The invention relates to the treatment by a fluid, or more generally by an acid fluid, of subterranean formations located in particular around an oil, gas, water or geothermal well.
Acid is diverted towards the zone to be treated by a surfactant flush, the injection of a foam and then the injection of an acid/surfactant composition. These operations are repeated as often as required, increasing at each stage representing approximately 80 cm (20 to 25 inches) of treatment in terms of height the quantity of foam injected.

REFERENCES:
patent: 3543856 (1970-12-01), Knox et al.
patent: 3948324 (1976-04-01), Lybarger
patent: 4159037 (1979-06-01), Varnon et al.
patent: 4232741 (1980-11-01), Richardson et al.
patent: 4237975 (1980-12-01), Scherubel
patent: 4427236 (1984-01-01), Dotson
patent: 4856588 (1989-08-01), Borchardt
patent: 5086840 (1992-02-01), Soucemarianadin et al.
Burman, J. W. et al., "Foam-Diverting Technique Improved Sanstone Acid Jobs", World Oil, Nov. 1987, pp. 31-36.

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