Oil reservoir permeability profile control with crosslinked wela

Wells – Processes – Distinct – separate injection and producing wells

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Details

166272, 166274, 166295, E21B 33138, E21B 4322, E21B 4324

Patent

active

049916521

ABSTRACT:
A composition capable of selectively plugging highly permeable zones in a subterranean formation. The composition forms a gel subsequent to its injection into the formation via an injection wall. The composition comprises an aqueous solution of a welan gum heteropolysaccharide biopolymer produced by the fermentation of a microorganism of the genus Alcaligenes, a phenolic compound, an aldehyde and water. The compositions of this invention will form stable gels even in low salinity brines. Also provided is a process for selectively plugging regions of higher permeability within an oil-bearing subterranean formation to improve sweep efficiency during a fluid flood oil recovery process using the gel-forming compositions of this invention.

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