Mechanism of CO2 micro-nano bubble-driven enhanced oil recovery in tight shale oil reservoirs

Hu Sun, Yan Gao, Weihua Yuan, Yifan Wei, Mingzheng Yang, Xiaopeng Zhai and Junqi Zhao

Energy, 2025, vol. 334, issue C

Abstract: This study explores the application of CO2 micro-nano bubbles in enhancing oil recovery from tight shale reservoirs under high-temperature and high-pressure conditions. The investigation aims to address gaps in understanding the morphological and phase behavior of CO2 micro-nano bubbles during oil recovery and their mechanisms of action in such extreme environments. Using a high-temperature, high-pressure PVT apparatus, reservoir conditions were simulated within a temperature range of 30–70 °C and pressure range of 1–35 MPa. Nanobubble morphology was evaluated through changes in average diameter, while phase transitions were assessed by measuring bubble concentration, dynamic instability coefficients, and the generation of CO2 gas during the recovery process.

Keywords: Tight shale oil; Micro-nano bubbles; CO2; Oil displacement mechanism; Morphological changes; Phase changes (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:334:y:2025:i:c:s0360544225032554

DOI: 10.1016/j.energy.2025.137613

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