PERFORMANCE EVALUATION OF NEW WATER BLOCKING AGENT IN LOW PERMEABILITY RESERVOIR WITH FRACTURES

Aiming at the problem of leaking off, a new kind of water blocking agent was developed for the first time.The properties of preformed weak gels and secondary crosslinked polymer gels were evaluated. The experiment results showed that preformed weak gel had many characteristics such as shear dilute rheological characteristic、anti-shear、easy injection and low filtration;Secondary crosslinked polymer gels had many characteristics such as high breakthrough pressure、high blocking efficiency、strong washing out endure、low damage efficiency to matrix and long time heat stability. And they were advantage to water shutoff in low permeability reservoir with fractures.