文献类型：期刊文献

英文题名：Microscopic transport and phase behaviors of CO2 injection in heterogeneous formations using microfluidics

作者：Guo, Yaohao;Liu, Fen;Qiu, Junjie;Xu, Zhi;Bao, Bo[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：256

外文期刊名：ENERGY

收录：;EI(收录号：20222612293070);WOS:【SCI-EXPANDED(收录号:WOS:000827484600005)】；

基金：Acknowledgement This work is financially supported by National Natural Science Foundation of China (21808056) , Natural Science Foundation of theScience and Technology Commission of Shanghai Municipality (No.19ZR1472200) . We also thank anonymous reviewers for their constructive comments that helped improving the quality of this paper.

语种：英文

外文关键词：CO(2 )injection; Microfluidics; Phase behavior; Miscible flooding; Huff-n -puff

摘要：CO2 injection into the geological formations is a promising option to enhance oil recovery while simultaneously contributing to carbon storage. Conventional core tests provide critical insights but still leave ambiguous transport mechanisms due to the limitation of real-time visualization. This study aims to directly observe the multiphase flow behaviors and phase change in CO2 injection at pore-scale using microfluidics. Our all-in-one chip design provides a universal platform to reproduce various CO2 injection strategies in the formation with permeability contrast, including flooding and huff -n-puff processes, and integrated a rapid measurement of minimum miscibility pressure (MMP). Miscible injection eliminates the capillary force in immiscible scenario, and promotes stable film-wise displacement with a higher recovery rate and an attenuated heterogeneity impact. We find that effective huff -n-puff operations require a sufficient gas concentration to generate bubbles and an adequate pressure gradient to push the dissolved gas displacement, which supports the importance of high depressurization rate from both physical phenomenon and inherent mechanism. Huff -n-puff re-energizes the reservoir after immiscible flooding through deep gas-oil interactions and induces a considerable growth in cumulative recovery. These micromodel results can significantly improve our fundamental understanding on detailed multiphase transport phenomena in CO2 injection and help to optimize implementation schemes. (c) 2022 Elsevier Ltd. All rights reserved.