Study On The Weak ASP Experiment For The Second Order Reservoir

In daqing oil field since the Eightys, since the research of asp flooding has been compl eted four major reservoir alkali asp flooding pilot test, as the displacement of asp flooding te chnology in the development of the second type reservoir, the displacement of an object is l ower, the difference of interlayer permeability is bigger, because there is a layer between the contradictions, and the reservoir interval more complex problems, such as by injecting abili ty test and optimization of asp flooding slug and chromatographic separation for experiment decide.Based on two types of reservoir in daqing oilfield, by conducting polymer molecular we ight, concentration and core permeability matching relationship between indoor experiment al research, calculation of the ternary system parameters such as drag coefficient and residu al resistance coefficient.Through physical simulation experiment of asp flooding, Lord vice slug size and concentration of various chemicals in the slug optimization, in order to determ ine the best Lord, vice slug size and slug concentration.Through long enough natural rock c ores should be used in as far as possible close to the reservoir under the condition of physica l simulation displacement experiment observed phenomenon of chromatography, to determi ne the ternary component without inferior parameters such as polyethylene.Results show that the highest degree of viscosity degradation affects the ternary system of injection pressure, permeability phase at the same time, the greater the degree of degradat ion, the lower the maximum injection pressure;Permeability affects the maximum injection pressure of the ternary system, on the viscosity of ternary system degradation degree phase at the same time, the lower the permeability, the higher the injection pressure;Under the con dition of such as adhesion, low molecular weight polymer injection amount is more, and in t he core are less able to reduce water phase permeability, and high polymer molecular weight can cause core plugging, considering the specific situation of the second type reservoir per meability, the proposal USES 16 million molecular weight polymer ternary system for injec tion, the shear viscosity top 50 mpas. ternary compound system;Applied with the actual rese rvoir poroperm characteristics of the preparation of the corresponding core with slug size an d concentration of optimum oil displacement experiments, the optimum injection slug main slug concentration for [1.2wt%(Na2CO3)+0.3wt%(S)+2200mg/L(P)]0.35 PV, deputy slug co ncentration for [1.0wt%(Na2CO3)+0.1wt%(S)+2200mg/L(P)]0.15 PV.Through natural castin g core ternary system dynamic retention experiment, determine the alkali hold up to 0.31 m g/g, surfactant hold up to 0.1 mg/g, hold up to 0.051 mg/g of polymer and alkali hold up thebiggest, combined with the measured results obtained the ternary system components witho ut inferior together, it is concluded that weak base ternary compound system in injection wit h chromatographic separation phenomenon;The when flowing through the model of asp syst em, polymer and alkali and surfactant had happened between chromatographic separation, p olymer breakthrough first, alkali and surfactant together then.The second class reservoir por e structure of the complex could increase the extent of the chromatographic separation.