Joule-Thomson Cooling During CO2 Injection Under Unsteady-State Delayed Heat Exchange
Christina Chesnokov (University of Adelaide)
Kofi Ohemeng Kyei Prempeh (University of Adelaide)
R Farajzadeh (TU Delft - Reservoir Engineering, Shell Global Solutions International B.V.)
Pavel Bedrikovetsky (University of Adelaide)
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Abstract
Joule-Thomson cooling during CO2 injection into low-pressure fields can lead to injectivity impairment due to hydrate formation. This paper presents axial-symmetric flow model, which can be used to predict propagation of temperature and CO2 fronts during CO2 injection into porous formations accounting for Joule-Thomson cooling and unsteady-state delayed heat exchange between the reservoir and the adjacent formations. The solution of the 1D flow is validated by comparing with the quasi 2D analytical heat-conductivity solution. The non-steady state heat exchange results in a temperature front that propagates without limit into the reservoir with time. The temperature profiles exhibit a temperature decrease from the injected temperature to a minimum value, followed by a sharp increase to initial reservoir temperature on the temperature front. The solution allows plotting temperature-pressure (T-P) profiles at fixed moments in the CO2-water phase diagram. By changing injection parameters such as injection rate, the T-P trajectories allow for assessment of hydrate formation.
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