Abstract
The above reported data show that temperature affects the stability of commercial polyacrylamide solutions in two different ways: The first process that increases the anionic character of polymers is responsible for the viscosity loss in the presence of monovalent salts and for eventual precipitation in the presence of divalent salts even if the molecular weight is not changed.Such a process will be governed by pH and temperature of oil reservoirs. The second process also leading to decreased viscosity values (even if the extent of hydrolysis is not changed) can be avoided or limited by appropriate precautions (excluding oxygen,adding stabilizers) .
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