An integrated model is proposed for simultaneous study of CO2-flood enhanced oil recovery and sequestration in both technical and economic points of view. Based on this model, Green Balance software is developed for quick estimation of performance and profitability of CO2-flood enhanced oil recovery and carbon capture and storage projects. This software benefits users to do sensitivity analyses in extended times, easily and quickly. Several sensitivity analyses were done and effects of reservoir parameters and economic expenditures and taxes were studied. Among all affecting parameters, the role of tax per CO2 emission is the most important one. The use of adjusted tax, scaled for each project's operational expenditures, is recommended. These regulations can make small carbon capture and storage projects, like large projects, profitable and more attractive to investors.