Abstract: A polymer solution is dried until full evaporation of water. The polymer formed after drying the polymer solution is heated up and active degradation temperature range at a given heating rate and a degree of polymer degradation within this temperature range are determined. Then the solution is dried and a thermal analysis is conducted within the temperature range including the active degradation temperature range. A loss of mass of a portion of a sample of a porous medium is calculated and a loss of mass of similar sample of the porous medium sample after pumping the polymer solution injection is also determined. Based on the derived values, weight concentration of polymer penetrated into the porous medium is determined.