Synergistic hydrocarbon surfactant system for enhancing CO2-oil miscibility: Insights from vanishing interfacial tension experiments

IF 5.1 2区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Science Pub Date : 2026-10-14 DOI:10.1016/j.ces.2026.125371

Jiawei Zhao, Shaopeng Li, Songyan Li

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引用次数: 0

Abstract

As carbon capture, utilization, and storage (CCUS) technologies advance, CO₂ flooding has gained significant attention due to its dual benefits of enhanced oil recovery (EOR) and geological CO₂ sequestration. However, for high-temperature reservoirs and crude oils enriched in heavy components, the MMP of the CO₂-crude oil system is often high, which makes miscible flooding difficult to achieve under reservoir conditions. In this study, tri-isobutyl citrate (TIBC) was synthesized via acid-catalyzed esterification and characterized by FTIR and ¹H NMR to confirm its structure. TIBC was then blended with Span 80 to construct a miscibility-enhancing system dominated by hydrocarbon chains and oxygen-containing functional groups, referred to as the system (TS), aimed at reducing the MMP of the CO₂-crude oil system. The results indicate that when the mass ratio of TIBC to Span 80 is 3:7 and the total concentration is 1.0 wt%, the system exhibits the optimal performance, reducing the MMP by 18.91%. Analysis of oil droplet interfacial behavior reveals synergistically improved CO₂ dissolution and extraction in crude oil, leading to continuous IFT reduction. The system ultimately reaches near-miscible or miscible conditions. The findings provide important guidance for EOR through CO₂ miscible flooding and for promoting CO₂ utilization and geological sequestration

查看原文本刊更多论文

增效碳氢表面活性剂体系增强CO2-oil混相：来自消失界面张力实验的见解

随着碳捕集、利用和封存（CCUS）技术的进步，二氧化碳驱油因其提高石油采收率（EOR）和地质封存二氧化碳的双重优势而备受关注。然而，对于高温油藏和富含重质组分的原油，co2 -原油体系的MMP往往很高，这使得在油藏条件下难以实现混相驱。本研究采用酸催化酯化法合成了柠檬酸三异丁酯（TIBC），并用FTIR和1H NMR对其结构进行了表征。然后将TIBC与Span 80混合，构建以烃链和含氧官能团为主的混相增强体系（TS），旨在降低co2 -原油体系的MMP。结果表明，当TIBC与Span 80的质量比为3:7，总浓度为1.0 wt%时，体系性能最佳，MMP降低18.91%。对油滴界面行为的分析表明，协同作用改善了原油中CO2的溶解和萃取，导致IFT持续降低。该体系最终达到近混相或混相条件。研究结果对CO2混相驱提高采收率、促进CO2的利用和地质封存具有重要的指导意义

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来源期刊

Chemical Engineering Science 工程技术-工程：化工

CiteScore

7.50

自引率

8.50%

发文量

1025

审稿时长

50 days

期刊介绍： Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline. Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.