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\begin{document}

\title{CT characterization of wellbore cement degradation under geologic
CO\textsubscript{2} storage conditions}



\author[1]{Liwei Zhang}%
\author[1]{Yan Wang}%
\author[1]{Kaiyuan Mei}%
\author[1]{Manguang Gan}%
\author[1]{Xiaojuan Fu}%
\author[1]{Sinan Liu}%
\affil[1]{Institute of Rock and Soil Mechanics, Chinese Academy of Sciences}%


\vspace{-1em}



  
  \date{May 12, 2024}


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\begin{abstract}
This presentation demonstrates a CT scanning and image analysis workflow
to characterize wellbore cement degradation under corrosive geologic
CO\textsubscript{2} storage (GCS) conditions. The workflow includes 1)
acquisition of raw CT images of the cement sample (before and after
exposure to CO\textsubscript{2}); 2) application of rigid registration
to align raw CT images; 3) acquisition of grayscale intensity difference
images; 4) application of noise filtering technique to obtain images
with good quality; 5) acquisition of 3D pore structure change of the
cement sample after CO\textsubscript{2} exposure from grayscale
intensity difference images, showing degradation of wellbore cement. To
demonstrate an application of the workflow, an experiment of reaction
between CO\textsubscript{2} and wellbore cement under corrosive GCS
conditions was conducted and the wellbore cement samples used in the
experiment went through aforementioned CT scanning and image analysis
procedures. CT image analysis results demonstrate a region with
increased porosity in the exterior of the cement sample (Zone 1) and a
region with decreased porosity next to Zone 1 due to
CaCO\textsubscript{3} precipitation (Zone 2). Next to Zone 2, a region
with increased porosity due to Ca(OH)\textsubscript{2} and C-S-H
dissolution (Zone 3) was observed. In summary, this study proves
feasibility to use 3D CT scanning and CT image analysis techniques to
investigate CO\textsubscript{2}-induced degradation of wellbore cement.%
\end{abstract}%



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