Enhanced oil recovery profile control with crosslinked anionic a

Details Enhanced oil recovery profile control with crosslinked anionic a Enhanced oil recovery profile control with crosslinked anionic a

1990-10-09

1992-01-07

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524547, 524555, 524510, 5253284, 525360, 525374, C08K 702

Patent

active

050792784

ABSTRACT:
An aqueous polymeric gel-forming composition capable of selectively plugging highly permeable zones in subterranean oil-bearing formations. The composition comprises an aqueous solution of an anionic acrylamide copolymer of high molecular weight, comprising about 5 to 95 weight percent of 2-acrylamido-2-methylpropanesulfonic acid, about 2 to 95 weight percent of N-vinyl-N-methyl acetamide and about 5 to 93 weight percent of acrylamide, and a crosslinking agent selected from the group consisting of transition metal ions, phenolic resins and amino resins. The compositions of this invention will form stable gels in brines of wide-ranging salinity and are effective at the pH levels encountered in carbon dioxide and water flooding operations. Also provided is a process for selectively plugging regions of higher permeability within an oil-bearing formation to improve sweep efficiency during a fluid flood oil recovery operation.

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Mobil Docket 4073, Ser. No. 917,324, filed Oct. 9, 1986.

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