Mechanical Properties of Sandstones Damaged by CO 2 Reactions and Flow Characteristics under Complex Mixed-Wettability

The acid production reaction between CO2 and water in rocks changes the pore structure, thereby altering the rock mechanical properties. To ensure the safety of CO2 storage, it is critical to identify the rock damage mechanisms, clarify the variation patterns of mechanical properties under damage conditions, and investigate the flow characteristics of two-phase CO2-water systems under complex mixed-wettability. This study established a constant-temperature and -pressure multiphase CO2-rock immersion experimental system. Additionally, a comprehensive experimental procedure integrating CO2 immersion, CT imaging, and uniaxial compression was designed. A comparative study revealed that reactions involving gaseous…

• NN
  National Natural Science Foundation of China

  Award: 52304029
• NS
  Natural Science Foundation of Liaoning Province

  Award: 2025-MS-137
• SK
  State Key Laboratory of Geomechanics and Geotechnical Engineering

  Award: SKLGME023022
• LR
  Liaoning Revitalization Talents Program

  Award: XLYC2403059