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Description
Efficient design of CO₂ injection strategies in tight formations requires a molecular-scale understanding of how oil, CO₂, and water interact in nanopores with distinct wall chemistries under partial water saturation. In this work, molecular dynamics simulations are used to examine primary depletion and subsequent CO₂ huff-n-puff in representative inorganic and organic nanopores. In quartz nanopores, water preferentially wets the mineral surface and forms a continuous film that weakens oil–wall adsorption, thereby promoting hydrocarbon production. During CO₂ huff-n-puff, CO₂ intrusion disrupts hydrogen bonding between water and polar oil components, further improving recovery. In kerogen nanopores, heavy and medium oil components are strongly adsorbed on the organic matrix, whereas water persists as droplets stabilized by alkane–polar molecular bridges and exerts a weaker control on production. There, CO₂ huff-n-puff enhances oil recovery mainly by lowering the interaction energy between kerogen and adsorbed hydrocarbons.
| Country | China |
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