Study on influencing factors of viscosity of HPAM solution in foam combination flooding in Chengdong Oilfield and its countermeasures

Viscosity of polymer solution prepared by oil sewage reduced significantly and influenced the polymer flooding efficiency. So the study of influencing factors of polymer solution viscosity was carried out. Factors affecting HPAM solution viscosity are tested in this paper, such as water quality, corrosion, chemical activities and so on. The result showed sulphide was the master factor affecting HPAM viscosity and sulphide was formed by frother. To solve the viscosity reduction, HPAM degradation inhibiter and oxidation sweetening were conducted in field and viscosity increased dramatically to guarantee the quality and effect of field HPAM injection.