A New Mathematical Model for Predicting CO2 Injectivity

Abstract This paper presents a new mathematical model for the estimation of CO 2 injectivity in saline formations. The model is derived for pressure build-up at a fully penetrating vertical well located in a homogeneous and horizontal formation. Solutions are presented for infinite acting, closed and constant pressure formation boundary conditions. The model includes the effects of relative permeability and CO 2 dissolution into formation brine and the formation of a drying-out zone around the well. To calculate the parameters required for the model, the best methods and correlations available in the literature are used. The new model is validated with numerical simulation. Using the superposition technique, the new model is extended to estimate the multi-well injectivity of CO 2 in an infinite-acting saline formation.