Permeability contrast correction employing a sulfate-free propio

Details Permeability contrast correction employing a sulfate-free propio Permeability contrast correction employing a sulfate-free propio

1985-03-11

1987-02-17

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 8554, C07F 1100

Patent

active

046440739

ABSTRACT:
A sulfate-free clear green solution of chromium(III) propionate is prepared by mixing aqueous propionic acid containing up to 55 weight percent propionic acid with a chromium(VI) oxidant, such as a dichromate or chromate, and a sulfur-containing reductant, such as a bisulfite, which on reacting yields two phases: a lower sulfate-containing phase for discard or recycle and an upper phase solution of sulfate-free clear green propionate-sequestered chromium(III), the latter phase being stabilized with additional acid. The upper phase solution is useful for crosslinking polymeric viscosifiers such as partially hydrolyzed acrylamide-based polymers and the like in permeability contrast corrections in enhanced oil recovery operations.

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