Nguyen, Quoc P.2012-11-062017-05-112012-11-062017-05-112012-08August 201http://hdl.handle.net/2152/ETD-UT-2012-08-6199textThis work investigates the performance of CO₂ soluble surfactants used for CO₂ foam flooding in fractured carbonate reservoirs. Oil recovery associated with the reduction of CO₂ mobility in fractures is assessed by monitoring oil saturation and pressure drops during injection of CO₂ with aqueous surfactant solution in artificially fractured carbonate cores. Distinct novel CO₂ soluble surfactants are evaluated as well as a conventional surfactant. Water flooding and pure CO₂ injection are conducted as baseline. Characterization of fluids and rock are also reported which include Amott test, oil phase behavior and slim tube test. Transport and thermodynamic properties of surfactant and supercritical CO₂ are used to evaluate the process on a core scale using a commercial reservoir simulator.application/pdfengCO2 foamCO2 soluble surfactantFoam in fractured carbonate reservoirCO2 flooding in carbonateEnhanced oil recoveryGas EORthesis2012-11-062152/ETD-UT-2012-08-6199