Patent ID: 8176984

Claim:
A method for sequestration of carbon dioxide in a formation traversed by a cased wellbore, comprising: a) finding a location in the formation having a first permeable layer directly overlain by a nearly impermeable layer, which in turn is overlain by a second permeable layer; b) running simulations of the formation assuming injection of carbon dioxide into the first permeable layer and injection of water along at least one length in said second permeable layer in order to find at least one length which provides desired results concerning leakage of carbon dioxide from the first permeable layer; c) completing the wellbore with at least two completions and with first perforations in the casing along said first permeable layer for the purpose of injecting carbon dioxide into the first permeable layer and with at least one set of second perforations in the casing along said at least one length which provides desired results for the purpose of injecting water into the second permeable layer; and d) injecting carbon dioxide and water into their respective layers simultaneously, with the nearly impermeable layer therebetween, where the water is injected at a pressure at least equal to the carbon dioxide injection pressure plus a gravitational head correction for the water and carbon dioxide minus an entry capillary pressure of the nearly impermeable layer.