Pilot Test Studies On Polymer-Surfactant Flooding For The Main Reservoirs After Polymer Flooding In Sa Zhong Oil Field,Song Liao Basin

The class I reservoirs is refers to the effective thickness greater than 2 m,effective permeability sandstone reservoir is greater than 500 md,its channel sand development of large scale and reservoir thickness and high permeability,and is the major reservoir of daqing oilfield oil production.Polymer-Surfactant agent is a newly developed a new suited to a variety of reservoir conditions of multivariate graft polymer,is it in ordinary polymers-polyacrylamide grafted on the branched chain according to surfactant function groups,make its have the crosslinking viscosity,shear resistance,emulsifying solubilization,salt resistant function,the viscoelasticity and the displacement performance is superior to the ordinary polymers.Polymer flooding comprehensive promotion of industrialization since 1996,polymer flooding is the main developing technology in daqing oilfield reservoir after water flooding,P I zone of reservoir in Sazhong area have all entered the stage of polymer flooding industrialization promotion.But from the statistic development effect,half of the geological reserves is still remaining underground of the class I oil reservoir after polymer flooding,Remaining oil distribution after polymer flooding is more concentrated,throughout the upper reservoir,its oil saturation is higher,and appearing the ribbon or flake distribution,fault zone and pinchout area of remaining oil is the main oil layer,it is difficult to form effective connectivity and further exploration.Polymer-Surfactant agent is a new kind of oil displacement agent,indoor oil displacement experiment results show that it can increase oil recovery by more than 10% after the middle molecules polymer agent flooding.In order to explore the further improve oil recovery technology of class I reservoirs after polymer flooding,daqing oilfield has carried out field experiment.This paper based on the Polymer-Surfactant agent flooding to improve oil recovery after polymer flooding test in PI zone of Sazhong area,daqing oilfield,decrypting the fine of reservoir characteristics and studying remaining oil distribution features after polymer flooding for the class I reservoir.According to the geological characteristics and reservoir properties,researching the flooding effect of Polymer-Surfactant agent after polymer flooding.And formation of form a complete set of tracking adjustment method for Polymer-Surfactant agent flooding.Knowing the dynamic change rule of Polymer-Surfactant agent flooding in class I reservoir after polymer flooding.This technology reference for basis to other new block scheme optimization design and development adjustment.It provides practice basis for the daqing oilfield to effective developing the remaining oil after polymer flooding in class I reservoir...