Evaluation Of Oil Resisting Foaming Complex Systems Flooding For Lamadian

Based on the foam flooding technology in the development of domestic and internationalsituation, making a systematic analysis of foam migration and flooding mechanism, for foamflooding pilot test with gas channeling problem, according properties of the foam agentsurface tension, interfacial tension, etc. from the molecular structure and properties, from themechanism of oil to foam, we screen and compound oil resistance foam system with lowinterfacial tension: concentration of0.075%phosphate ester betaine with sodium dodecylhydroxypropyl+concentration of0.075%fluorocarbon101005(2)+0.15%betaine. Foamcomposite index of the system reached6,000with good oil resistance, under conditions of30%oil and gas-liquid ratio1:1According comparative analysis of indoor flooding experiment, low interfacial tensionfoam system is better than single foam system, single low-tension system, and traditionalfoam system and6.55percent higher than traditional foam in recovery. Different viscosityfoam flooding experiments showed that increasing the viscosity of complex systems enhancedoil recovery little indicating that the low interfacial tension foaming system has a strongability to expand swept volume; low interfacial tension foaming system has good adaptabilityto core heterogeneity, and is more suitable for the more serious heterogeneity of the reservoir;Residual oil saturation in the core do not affect final oil displacement.