Response of Mobility Control Agents to Shear, Electrochemical, and Biological Stress
Bench-top studies were carried out in the laboratory to evaluate the degradation of Polyacrylamides and polysaccharides under simulated conditions of shear, electrochemical, and microbial stress. Effects were evaluated in solutions with varying concentrations of univalent and polyvalent electrolytes (0-100,000 ppm) at different values of temperature. The effect of microbial stress was evaluated by inoculating pure cultures of anaerobes and aerobes into solutions of the biopolymers and copolymers and measuring the bulk properties as a function of time to determine kinetics of biological and chemical degradation. The viscoelastic responses of the Polyacrylamides as indicated by their screen factor and the filterability of the polysaccharides were monitored at the above conditions. Core flooding tests were carried out to further evaluate the chemical integrity of the mobility control agents under simulated field conditions. Average pressure drop and breakthrough concentrations as a function of pore volume throughput were used to evaluate the rheological and retentive behavior of the copolymers and biopolymers in brine-saturated and partially oil-saturated sandstone cores. The rheological behavior of fluids in the reservoir cores is correlated with the degradation of polymers from bulk phase measurements of shear viscosities, screen factors and millipore filter ratios.
KeywordsRiver Water Formation Water Resistance Factor Retentive Behavior Formation Brine
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