Organic crosslinking of polymers for CO2 flooding profile contro

Details Organic crosslinking of polymers for CO2 flooding profile contro Organic crosslinking of polymers for CO2 flooding profile contro

1987-06-30

1988-12-27

Suchfield, George A.

Wells

Processes

Separating material entering well

166270, 166274, 166295, 523130, E21B 33138, E21B 4316, E21B 4320

Patent

active

047934166

ABSTRACT:
A process for recovering hydrocarbonaceous fluids from a formation having a substantially low pH where a rehealable gel prepared ex-situ is used to close off a zone of greater permeability. Said gel is obtained by mixing into an aqueous medium sufficient biopolymer amounts of a Xanthan or Alcaligene polysaccharide. This mixture is maintained at a pH of about 5.5 while an aminoplast resin in excess of 4,000 ppm is added thereto which causes said gel to form in about 0.5 to 6 hours. The resultant gel is suitable for use in a carbon-dioxide flood process. Said gels are very stable at a pH of less than about 5.5.

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Hawley, Gessner G., The Condensed Chemical Dictionary, Eighth Edition, 1971, pp. 912.

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