Method for acidizing formation having high permeability water zo

Details Method for acidizing formation having high permeability water zo Method for acidizing formation having high permeability water zo

1995-06-12

1998-01-20

Gibson, Sharon

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

507103, 507135, 507203, 507216, 507255, 507260, 166276, 166295, 166300, C09K 700, E21B 4304

Patent

active

057101094

ABSTRACT:
An improved method for acidizing an oil bearing formation in the presence of water bearing zones having high permeability is described. An aqueous fluid is pumped into the formation preceding the injection of stimulation material. This fluid contains hydroxyethylcellulose, a fluorescent dye and an organic acid anhydride, which during hydrolysis reduces the pH and the viscosity of the solution making it retrievable without damage to the formation.

REFERENCES:
patent: 4147211 (1979-04-01), Sandiford
patent: 4895207 (1990-01-01), Freidman et al.

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