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Petroleum Science 2023年第1期20卷 362-369页

作者： Yu-Long Yang Yu Hu Ya-Ting Zhu Ji-Gang Zhang Ping Song Ming Qin Hai-Rong Wu Zhao-Jie Song Ji-Rui Hou State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-BeijingBeijing 102249China College of Carbon Neutral Energy China University of Petroleum-BeijingBeijing 102249China Unconventional Petroleum Research Institute China University of Petroleum-BeijingBeijing 102249China Research Institute of Petroleum Exploration and Development Xinjiang OilfieldKaramay 834000China

tight conglomerate reservoirs are featured with extremely low permeability,strong heterogeneity and poor water ***_(2) huff-n-puff has been considered a promising candidate to enhance oil recovery in tight reservoirs,owing to its advantages in reducing oil viscosity,improving mobility ratio,quickly replenishing formation pressure,and potentially achieving a miscible ***,reliable inhouse laboratory evaluation of CO_(2) huff-n-puff in natural conglomerate cores is challenging due to the inherent high formation *** this study,we put forward an equivalent method based on the similarity of the miscibility index and Grashof number to acquire a lab-controllable pressure that features the flow characteristics of CO_(2) injection in a tight conglomerate *** impacts of depletion degree,pore volume injection of CO_(2) and soaking time on ultimate oil recovery in tight cores from the Mahu conglomerate reservoir were successfully tested at an equivalent *** results showed that oil recovery decreased with increased depletion degree while exhibiting a non-monotonic tendency(first increased and then decreased)with increased CO_(2) injection volume and soaking *** lower oil recoveries under excess CO_(2) injection and soaking time were attributed to limited CO_(2) dissolution and asphaltene *** work guides secure and reliable laboratory design of CO_(2) huff-n-puff in tight reservoirs with high formation pressure.

关键词： tight conglomerate reservoir CO_(2)huff-n-puff Similarity-based equivalent pressure Enhanced oil recovery

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