Some implications of cold CO2 injection into deep saline aquifers

摘要: When CO 2 is injected down a well, the temperature at bottom of well depends on surface conditions, heat exchange with wall and pressure work within well. Typically, lower than local geothermal temperature. As this relatively cold flows into porous matrix, thermal equilibrium manifests front, behind which matrix adjust to injection increases across becomes less viscous dense. In high permeability rock, as flow spreads from it buoyancy-driven, so adjusts deep, slow shallow, fast flow. The increased depth in near source region has two significant implications. First, storage potential more rock flooded 2, but may also enhance leakage seal occurs regions where current sufficiently deep for exceed capillary entry pressure.