STORE Feature - Cement, CO2, Confining Stress & Conductive Pathways
From Science Direct:
Nicolas J. Huerta
Steven L. Bryant (STORE Team Member)
Brian R. Strazisar
Barbara G. Kutchko
Lauren C. Conrad
February 2011 -- Wells remain inadequately studied with respect to the probability and rate of leakage in geologic CO2 sequestration. Efforts to model reaction-induced leakage along wells have been limited due to poorly understood reaction between cement and sequestered CO2 fluids.
Recent work on class H cement under reservoir conditions has shown a slow reaction rate, even considering the timescale of interest for CO2 sequestration (Kutchko et al. ). This observation is consistent -with field scale observations at a CO2 enhanced oil recovery operation (Carey et al. ). These results suggest that loss of well integrity from degradation of intact cement is not a significant leakage risk.
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