Micro-CT Characterization of Wellbore Cement Degradation in SO₄^2-–Bearing Brine under Geological CO₂ Storage Environment

In order to explore the process of acid- and CO 2 -induced degradation of wellbore cement and the development of pre-existing leakage channels in wellbore cement under sulfate-rich geological CO 2 storage conditions, wellbore cement samples were immersed in SO 4 2- -bearing brine solution for 7 days, and the samples after reacting with the low and circumneutral pH solutions were scanned by a micro-CT scanner. HCl+Na 2 SO 4 solution was used to...