The Oil Displacement Technology Research On The Weak ASP Experiment For The Eastern Transition Zone In Daqing

ASP flooding can increase oil displacement efficiency and sweep volume displacement system, at the same time with low interfacial tension, good viscosity stability and emulsifying properties and has become one of the leading mining technology in Daqing oil field.A large number of experiments show that the alkali ASP system displacement to the formation and oil displacement equipment damage is bigger,have been advocating is not a way of the displacement, but the ternary system in improving water recovery effect is more obvious, so in this paper, the transition zone of eastern choose weak base the optimal screening system formulation of ASP system.Based on ternary oil displacement mechanism must be analyzed on the basis of the various properties of weak base ternary compound system, mainly including weak base ASP system interface, viscosity stability, emulsifying properties, adsorption properties,etc, the evaluation of research and in the experiment by studying the different concentration of alkali, surface active agent on the properties of the ternary system, has carried on the preliminary selection, the experimental results show that the weak base ASP system can in alkali concentration 1.0%?1.2%, surfactant concentration is greater than 0.2%, after can reach 10-3mN/m ultra-low interfacial tension.Then carry out the polymer molecular weight, concentration and core permeability matching relationship between indoor experimental research, calculation of the ternary system parameters such as drag coefficient and residual resistance coefficient, gives the weak base ASP system and the transitional zone in the east the adaptability of reservoir permeability.Through indoor physical simulation flooding experiments, comparison and analysis the different main slug of ASP flooding, vice slug, front slug, subsequent protection slug oil displacement effect, finally some weak base ASP flooding system of optimal formula:front slug: 0.03PV×[1500mg/L 1600×10⁴HPAM] ; ASP main slug : 0.35PV×[0.2%WPS+1.2%Na2C03+2000mg/L 1600×10⁴HPAM]; ASP vice slug: 0.15PV ×[0.1 % WPS+1.0%Na₂CO₃+2000mg/L 1600 x 10⁴HPAM]; Subsequent protection slug:0.2PV×[1500mg/L 1600×10⁴HPAM]?...