Oil reservoir permeability control using polymeric gels

Wells – Processes – Distinct – separate injection and producing wells

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166246, 166275, 166294, 166295, 166300, 523130, E21B 33138, E21B 4322

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active

046588981

ABSTRACT:
The permeability of subterranean oil-bearing formations is selectively reduced by the injection into the formation of the non-xanthan, anionic heteropolysaccharide S-130 produced by fermentation with a microorganism of the Alcaligenes species. The polymer forms shear-thinning, viscous solutions which selectively enter the more highly permeable regions of the formation and form a gel plug in them to reduce their permeability. The polymer forms gels which are stable under a wide range of reservoir conditions including high temperatures.

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Kelco Developmental Product Announcement MX-6 (8/1981).
Pure and Appl. Chem. 56, No. 7, 879-892, (1984), Sandford et al.

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