Title: Permeability contrast correction employing propionate-sequestered chromium prepared by nitrite/dichromate redox
Application Number: 86100473 Application Date: 1986.01.22
Publication Number: 1003676 Publication Date: 1986.10.01
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C07F11/00;C09K7/02;E21B43/20
Applicant(s) Name: Phillips Petroleum Co. Address:
Inventor(s) Name: Paul Steven Hudson
Attorney & Agent: LUO YINGMING CHEN JIZHUANG
Abstract:
    A process for preparing clear green chromium(III) propionate solutions which comprises admixing such as propionic acid with water, a chromium(VI) source such as dichromate, adding thereto a nitrite, such as sodium nitrite, to reduce the chromium(VI) to chromium(III), in the presence of excess acid, preferably propionic acid, optionally combined with additional acid such as muriatic acid, to produce a stable solution useful with polymers, such as partially hydrolyzed acrylamide-based polymers, in permeability contrast correction procedures for high permeability streaks in oil field treatments.
Time: 6
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