It is recognized that oil recoveries in plays producing liquids are low (5-10%), and that new technologies are necessary to unlock the enormous amount of stranded oil. Secondary recovery in the form of water flooding is common in conventional reservoirs. Gas injection is used to enhance recoveries in a number of cases, with carbon dioxide (CO2) being the most common injectant. Keys to the success of any injection strategy to enhance recoveries are the compositions and properties of the phases formed (phase behavior) and ow capacities (relative permeabilities) of the phases.
Previous research conducted at the Energy & Geoscience Institute has revealed interesting permeability characteristics for organic and aqueous phases. Once the suitability of injection fluid is established based on phase behavior and ow considerations, an appropriate injection-production program must be designed to understand, how, where and when to inject and produce fluids. Experimental investigation of phase behavior and ow for various injectants and computer simulations of injection/production strategies will be undertaken in this project.