Application and Mechanism Research of High-efficiency Depth Profile Control Chemicals in Improving Oil Recovery
The application and mechanism of high-efficiency depth profile control chemicals in improving oil recovery were explored through experimental methods such as high-performance liquid chromatography,interfacial tensiometer measurement,core displacement experiments,and scanning electron microscope observations.Research results showed that the chemical agent was mainly composed of cross-linked polymer(58.6%),surfactant(29.5%)and nanoparticles(11.9%),and had good rheological properties and thermal stability.The viscosity of the chemical agent at 25℃was 121.6 mPa·s,which decreased as the temperature increased,but still maintained a viscosity of 58.3 mPa·s at 100℃;the chemical agents could significantly reduce the oil-water interfacial tension from 32.6 mN∙m-1 to 9.6 mN∙m-1.In the core flooding experiment,the additional recovery rate after using this chemical agent reached 19.2%,and the total recovery rate was increased to 47.8%;in addition,the optimal injection parameter combination was a chemical agent mass fraction of 0.5%and an injection rate of 0.5 mL∙min-1,injection volume 1.0 PV.Mechanism analysis showed that this chemical agent effectively improved oil recovery through multiple mechanisms such as reducing oil-water interfacial tension,improving reservoir permeability,adjusting flow resistance,and changing pore structure.This research provides new technical support for the efficient development of oil fields and has important theoretical significance and application value for improving oil field recovery.
Profile control chemicalsRecovery rateOil-water interfacial tensionOil displacement efficiencyMechanism of action
NETL
NSTL
万方数据
