CO2-responsive beta-cyclodextrin materials for heavy oil viscosity reduction
CO2-responsive surfactant(MJD230)was synthesized from electrostatic interaction between environmental-friendly β-cyclodextrin modified by maleic anhydride(MAH-β-CD)and polyether amine(JD230)under mild conditions.MJD230 could form a stable oil-in-water emulsion with oil,thereby effectively reducing the surface tension of the solution,and could be used repeatedly for emulsification and demulsification of heavy oil under the regulation of CO2.The structure of MJD230 was characterized by FTIR.The synthesis conditions of MJD230 were optimized via viscosity reduction rate and emulsion particle size,followed by assessment on its viscosity reduction performance and stability.When MJD230 was prepared under the conditions of reaction temperature 60℃,reaction time 60 min,n(MAH-β-CD)∶n(JD230)=2∶1 and MJD230 aqueous solution with a mass fraction of 0.5%was emulsified with heavy oil in volume ratio of 3∶7,the viscosity reduction rate of heavy oil could reach 99.19%.The reversible changes of pH and conductivity of the reaction system proved the response of MJD230 solution to CO2,indicating the feasibility of a new enhanced heavy oil recovery technology combining surfactant flooding and CO2 capture.
electrostatic interactionsurface tensionCO2-responsive surfactantsviscosity reduction of heavy oildemulsificationoil field chemicals
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