Experimental Studies Of The Surfactant/Polymer Flooding System In Shuang He Oil Field

Shuanghei oilfield has been developed for 28 years. This process has experienced six stages: initial development, subdivision of reservoir and comprehensive adjustment, adjuctmeat focusing on primary infill and secondary infill, local subdivision and readjustment phase which take well group as unit duringh super-high water-cut period. At present high water-cut stage, surfactant/polyment flooding is applied to develop remaining oil.Previous research elucidated that saturation distribution is considered as a technoloy that not only improve displacement efficiency by increase sweep efficiency. In addition,application of surfactant/polyment flooding system,compared with ASP flooding system,can prevent alkali from damaging layer. Therefore,it need to intensify the study of surfactant/polyment flooding.In this paper, static experiments such as viscosity stability evaluation, emulsion property evaluation and interfacial tension measurement have been done to optimise surfactant/polyment flooding system which suits to geological characteristics of 438 zoneⅠⅡ1-2 layer system Shuanghe oilfield.And then the paper conduct research on relative permeability curve, coefficient of resistance, residual resistance factor, injection capacity, retention and adsorption and effect of displacing oil of the surfactant/polyment flooding system. Surfactant/polyment flooding system that is suited to study area, optimal concentration, optimal slug size and optimal injection pattern have been found out.And technical limitations of the system have been confirmed. Saturation distribution and flow laws of saturation distribution in oil layers with diferent permeabilities.The results of the experiments showed that stability of viscosity and interfacial tension of surfactant/polyment flooding system is good.The results also indicated that the optimal concentration of the system is Cp=1500mg/L, Cs=0.3%.It can be also confirmed that in the high permeability zones with diferent permeability contrasts,the adjustment range of surfactant/polyment flooding system is 0.21～0.37PV.