Experimental study on compatibility of reservoir and polymer gel profile control agent

The coupling relationship between polymer gel system and reservoir pores is an important basis for scientific formulation of tertiary oil recovery programs. profile control agent can significantly modify the fluid migration path inside reservoir. In this study, artificial cores were used to carry out indoor water flooding experiments after injection that considering formation permeability, concentration rates. Based on accurate records breakthrough pressure volume during flooding, as well a large number observations microscopic morphology displacement, set criteria determining reservoir-matched agents proposed. experimental results show complex spatial network structure formed gelation system. As increases, becomes denser. At same time, unit becoming smaller, order grid chain clearer. Under condition low concentrations, backbone structures are obvious, but there lot fine pores. When greater than 1,500 mg/L rate less 0.15 ml/min, 0.2 MPa, plugging 95%, good effect obtained.