Screening and Evaluation of Foam System Under Simulated Reservoir Conditions
In this paper,a method of foam formation in rock core is used to connect a water drive to a water bearing 98％with a size of 4.5cmx4.5cmx30cm long core is used to simulate the formation of foam under the condition of underground.The method of foamed by long core is injected into foaming agent to form foam through long core,and different foam systems are obtained.According to the blistering volume and half-life,the comprehensive coefficient of the foam system is calculated,and the foaming agent for foaming is screened.In the foam system,adding different concentration of foam stabilizer and foaming with long core method,the appropriate foam stabilizer is selected to enhance the stability of the foam system.In order to achieve the ideal foaming effect,fourteen alkyl sulfonated beet(SFN)and twelve alkyl sulfate(SDS)two surfactants were mixed,and the best foam system was studied by orthogonal experiment.The formulation of foam system was optimized by orthogonal experiment.The displacement evaluation of the optimized foam system is carried out.Through the three tube parallel core displacement experiment,the displacement effect of the foam system and the changes of liquid production in different layers under different permeability extreme conditions are studied.It is found that the greater the coefficient of permeability variation is,the greater the decrease in the liquid production under the high permeability layer during the foam flooding stage,and the greater the increase of liquid production in the middle and low permeability reservoirs.
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