Permeability contrast correction employing propionate-sequestere

Details Permeability contrast correction employing propionate-sequestere Permeability contrast correction employing propionate-sequestere

1985-03-11

1987-01-13

Sneed, Helen M. S.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

556 5, 556 6, 556 61, 556 4, 252 855, C07F 1100

Patent

active

046365729

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.

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