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Information Seminar Paper

Title

EFFECTS OF GELATION CONDITIONS ON THE RHEOLOGICAL PROPERTIES OF THE NANOCOMPOSITE HYDROGELS BASED ON POLYACRYLAMIDE FOR WATER SHUT-OFF APPLICATIONS

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Abstract

 POLYMERIC NETWORKS ARE EMPLOYED IN MANY COMMERCIAL APPLICATIONS, ESPECIALLY IN OIL RECOVERY TREATMENTS FOR CONTROL OF THE EXCESS WATER PRODUCTION THROUGH PROFILE MODIFICATION AND BLOCKING THE PATHS WITH HIGH PERMEABILITY TO WATER. IN THIS RESEARCH, CONVENTIONAL AND NANOCOMPOSITE (NC) POLYACRYLAMIDE HYDROGELS ARE PREPARED AND THE CROSSLINKING PROCESS AND VISCOELASTIC BEHAVIORS OF THEM ARE STUDIED. THE XRD PATTERNS TAKEN FROM THE LAPONITE CONTAINING NC HYDROGELS DO NOT SHOW ANY DISTINCT CHARACTERISTIC BASAL REFLECTION FOR ALL THE NC HYDROGELS PREPARED AT DIFFERENT GELANT VOLUME. EVALUATING OF THE CROSSLINKING BEHAVIOR OF THE AQUEOUS REACTION MIXTURE SHOWED A RAPID INCREASE OF THE MIXING TORQUE FOLLOWED BY A PLATEAU REGIME WHERE THE TORQUE VALUE IS CONSTANT. DYNAMIC RHEOMETRY ON THE PREPARED HYDROGELS SHOWED THAT THE VISCOELASTIC PROPERTIES SUCH AS STORAGE MODULUS, COMPLEX VISCOSITY AND SHEAR STRESS OF THESE GELS DECREASE WITH INCREASING THE VOLUME OF THE REACTION MIXTURE. PROPERTIES SUCH AS STORAGE MODULUS, COMPLEX VISCOSITY AND SHEAR STRESS OF THE NC GEL WERE HIGHER THAN THOSE OF CONVENTIONAL GEL. BUT ADDITION OF LAPONITE INTO THE POLYACRYLAMIDE GELS SLIGHTLY DECREASED THE VISCOUS ENERGY DISSIPATING PROPERTIES OF THE NETWORK. DAMPING PROPERTIES OF THE NC GEL WAS LOWER THAN THAT OF CONVENTIONAL GEL. THE RESULTS OF THIS RESEARCH SHOW THE IMPORTANCE OF THE EVALUATIONS REQUIRED BEFORE SCALE-UP OF HYDROGELS FOR WATER SHUT-OFF APPLICATIONS.

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