Testing of polymer formulations gels to optimize the oil wells performance

This study investigates the formulations of polymer gels based on partially hydrolyzed polyacrylamide and chromium acetate for oil well treatment. The dependence of the dynamic viscosity of gel-polymer compositions on chemical concentrations and shear rate was determined at a temperature of 40 °C. It was shown that increasing the polymer concentration from 0.5% to 2.5% leads to an increase in dynamic viscosity from 5,486 cP to 267,505 cP, meaning that a fivefold increase in polymer concentration results in a 48-fold increase in viscosity. Evaluation of polymer gels using the Sydansk Gel Strength Code demonstrated that the 2.5% gel exhibited the highest strength (I), whereas the 0.3% and 0.5% gels were characterized by moderate strength (D). The study also addresses the degradation of gels using breakers (sodium hypochlorite and NaOH). The obtained results allow for the formulation of recommendations on selecting optimal gel-polymer compositions for isolating high-permeability channels and improving the sweep efficiency of oil reservoirs.