Visual characterization, exergy and mechanism analysis of in-situ nonequilibrium dynamic phase-behavior of CO2-oil

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy Pub Date : 2025-05-13 DOI:10.1016/j.energy.2025.136560

Yiqi Zhang , Shenglai Yang , Yun Luo , Yuning Han , Lerao Tian , Qing Liu , Xinyuan Gao , Bin Shen , Renfeng Yang , Jing Li

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引用次数: 0

Abstract

CO₂-enhanced oil recovery (EOR) is the key technology for upstream petroleum industry to transition towards sustainable development. The phase-behavior of CO₂-oil is the scientific basis for studying CO₂-EOR. In this paper, the in-situ miscibility of CO₂-different oils is described continuously by using visual Pressure-Volume-Temperature (PVT) cell, and the dominant mass transfer effect at different pressures is analyzed. Then, based on the results of PVT physical properties and oil-component changes, phase-behavior differences and miscibility mechanism are investigated. Finally, the advanced exergy analysis of miscible process is carried out, and the effect of different phase-behavior on oil development is evaluated. The results show that the miscible process of CO₂-oil can be divided into three stages. The main mass transfer in the primary oil expansion stage is CO₂ dissolution. In the transition stage of mass transfer, CO₂ and oil begin to transfer mass to each other, CO₂ dissolution and oil extraction coexist, and the dominant mass transfer effect changes. The main mass transfer in miscible stage is the transfer of oil to CO₂ and the realization of miscibility. The pressure is the driving factor of miscibility, and the composition of oil is the essential reason to determine the result of miscibility, the remaining components of different oils show a normalization trend dominated by heavy components in miscible process. The result of exergy calculation can effectively reflect the direction and intensity of mass transfer, and selecting the pressure range corresponding to the positive peak of exergy can improve the effect of phase-behavior on oil development.

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co2 -油原位非平衡动态相行为的目视表征、火用及机理分析

二氧化碳提高采收率（EOR）是上游石油工业实现可持续发展的关键技术。co2 -油的相行为是研究co2 -采收率的科学依据。采用视觉压力-体积-温度（PVT）单元连续描述了co2 -不同油品的原位混相，分析了不同压力下的显性传质效应。然后，基于PVT物性和油组分变化的结果，研究了相行为差异和混相机理。最后，对混相过程进行了先进的火用分析，评价了不同相行为对油气开发的影响。结果表明，co2 -油的混相过程可分为三个阶段。原油初级膨胀阶段的主要传质是CO2的溶解。在传质过渡阶段，CO2与油开始相互传质，CO2溶解与抽油共存，主导传质效应发生变化。混相阶段的主要传质过程是油向CO2的传递和混相的实现。压力是混相的驱动因素，油的成分是决定混相结果的根本原因，不同油的剩余组分在混相过程中呈现以重组分为主的归一化趋势。火用计算结果能有效反映传质方向和强度，选择火用正峰对应的压力范围，可以提高相行为对油气开发的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Energy 工程技术-能源与燃料

CiteScore

15.30

自引率

14.40%

发文量

审稿时长

14.2 weeks

期刊介绍： Energy is a multidisciplinary, international journal that publishes research and analysis in the field of energy engineering. Our aim is to become a leading peer-reviewed platform and a trusted source of information for energy-related topics. The journal covers a range of areas including mechanical engineering, thermal sciences, and energy analysis. We are particularly interested in research on energy modelling, prediction, integrated energy systems, planning, and management. Additionally, we welcome papers on energy conservation, efficiency, biomass and bioenergy, renewable energy, electricity supply and demand, energy storage, buildings, and economic and policy issues. These topics should align with our broader multidisciplinary focus.