PSI - Issue 80

G. Mubarak et al. / Procedia Structural Integrity 80 (2026) 157–168 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Figure 2 : Dimensional analysis of (a) ‘‘long’’ sample and (b) ‘‘short’’ sample in as -received condition, with periodic dimension measurements overlaid.

Figure 3: Visual examination of the (a) internal surface after splitting, (b) external surface as received, (c) sand blasted external surface, and (d) fracture face after sectioning.

3.2 Corrosion Modelling The corrosion modelling results provide a comprehensive depth- based analysis of the tubing’s internal environment, particularly focusing on pH distribution, flow regime, scaling tendencies, and pitting corrosion risk. In Figures 6 and 8, the deepest point of the well is at 0 km whereas the wellhead is at the right-most point on the x-axis. As illustrated in Figure 6 , the highest pH values occur at the deepest points of the well despite the elevated CO₂ partial pressures typically associated with acidification. This counterintuitive result is explained by the significantly lower solubility of CO₂ in water at high down hole temperatures, limiting carbonic acid formation, as shown in the solubility