A quick evaluation model for CO2 flooding and sequestration
CO2 flooding not only triggers an increase in oil production, but also reduces the amount of CO2 released to the atmosphere (by storing it permanently in the formations). It is one of the best ways to use and store CO2. This paper firstly selects the key factors after analyzing the factors influencing the CO2 storage potential in the formations and oil recovery, and then introduces a series of dimensionless variables to describe reservoir characteristics. All influencing factors with varying values are calculated through a Box-Behnken experimental design. The results are interpreted by a response surface method, and then a quick screening model is obtained to evaluate the oil recovery and CO2 storage potential for an oil reservoir. Based on the evaluation model, sensitivity analysis of each factor is carried out. Finally, research on CO2 sequestration and flooding in a typical reservoir indicates that the evaluation model fits well with the numerical simulation, which proves that the evaluation model can provide criteria for screening attractive candidate reservoirs for CO2 sequestration and flooding.