Organic crosslinking of polymers for co _flooding profile...

Details Organic crosslinking of polymers for co _flooding profile... Organic crosslinking of polymers for co _flooding profile...

E - Fixed Constructions

21

B

166/33

E21B 33/138 (2006.01) C09K 8/502 (2006.01) E21B 43/16 (2006.01)

Patent

CA 1293184

F-4350 ORGANIC CROSSLINKING OF POLYMERS FOR CO2 FLOODING PROFILE CONTROL 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 5.5 while an aminoplast resin in excess of 4,000 ppm is added thereto which causes said gel to form in 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 5.5.

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