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Unconventional oil reserves, including heavy oil, oil/tar sands, and shale oil, are crucial for global energy supply during the energy transition. Many Middle Eastern oil and gas fields have formed tarmats due to asphaltene precipitation. The Rumaila field in southern Iraq is heavily affected by tarmats, impacting oil production and secondary recovery. This research aims to improve reservoir management by integrating advanced numerical modeling simulations from pore-to-field scale. The work uses a Digital Rock Physics workflow to investigate the impact of tarmat solid particles in pore systems.