Amino resin modified xanthan polymer foamed with a chemical blow

Wells – Processes – Distinct – separate injection and producing wells

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Details

166274, 166295, 166300, E21B 4322, E21B 33138

Patent

active

048301086

ABSTRACT:
A method for reducing the permeability in a desired area of a formation wherein a foamed gel is formed in-situ by injecting a solution into said formation. Said solution comprises a gellable composition including water; a cross linkable polysaccharide biopolymer; an aminoplast resin which reinforces said biopolymer; and sufficient transitional metal ions to form a gel of the desired size and strength. The gelled solution is foamed by including therein a chemical surfactant, and a chemical blowing agent. Once in the formation to the desired depth, the chemical blowing agent decomposes and generates a gas sufficient to foam the gelled solution. The gelled foam stiffens and reduces the permeability in a desired area.

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