Investigation of mobility control polymers. Pt. 1. Study of microgel reactions. Pt. 2. Prediction of resistance effect in porous media
The solutions of Dow Pusher used as mobility control agents in porous media contain anhydride crosslinks. The disintegration of microgel due to rehydration of anhydride crosslinks is a reaction which is governed by the pH of the system. Formaldehyde appears to react with the microgel, stabilizing the crosslinks. Its effect in this respect is greatly determined by the time of its addition. When compounds containing 2 or more hydroxyl groups, e.g., ethylene glycol, glycerine, sorbitol and sugar (sucrose) are added to polymer solutions, the crosslinks are stabilized and the polymer solution tends to plug the porous medium. The net result of these reactions is the replacement of 2 relatively unstable anhydride crosslinks by a more stable ester type bridge. Thus, the stabilization of microgel with formaldehyde and polhydric alcohols could be a useful tool in mobility control technology. The presence of microgel in partially hydrolyzed polyacrylamides plays an important role in mobility control.
- OSTI ID:
- 6834197
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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ADDITIVES
ALDEHYDES
ANHYDRIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COLLOIDS
CONTROL
CROSS-LINKING
DISPERSIONS
FLUIDS
FORMALDEHYDE
FRACTURING FLUIDS
GELS
MATERIALS
MOBILITY
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYAMIDES
POLYMERIZATION
POLYMERS
POROUS MATERIALS
STABILIZATION