IF 5.2 3区 工程技术 Q2 ENERGY & FUELS
Guo-Tao Fu, Zi-Gang Zheng, Yong-Qiang Zhang, Yu-Ting Dai, Dan-Chen Li, Jie Zhan, Chun-Ning Gao* and Li-Wu Fan*, 
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引用次数: 0

摘要

二氧化碳在原油中的溶解度是一个关键参数,它显著影响二氧化碳在低渗透油藏中的泄洪性能。然而,在现有文献中,有关 30 兆帕以上高压条件下二氧化碳在原油中溶解度的数据相当缺乏,因此存在很大的数据缺口。为了弥补这一不足,我们测量了原油中二氧化碳在高压条件(10-50 兆帕)和宽温度范围(55-100 °C)下的溶解度。我们的研究结果表明,在压力依赖性方面存在非线性饱和趋势,这与之前研究中报告的近似线性趋势有所不同。利用这些数据,我们为原油中二氧化碳的溶解度预测开发了一种新的经验相关性,其偏差小于 10%,为高压应用提供了更高的可靠性。此外,基于核磁共振 (NMR) 的二氧化碳淹没实验为了解不同混溶状态下的石油利用程度和动态生产性能提供了新的视角。与完全混溶的充注相比,二氧化碳近混溶的充注具有采油效果好、沥青质沉淀倾向低和注入成本相对较低等优点,因此被推荐为实际应用中更可行的选择。这项研究填补了现有文献中有关高压二氧化碳在原油中溶解度的数据空白,为在低渗透油藏中开采二氧化碳水淹法提供了科学指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

High-Pressure CO2 Solubility in Crude Oil and CO2 Miscibility Effects on Oil Recovery Performance in Low-Permeability Reservoirs

High-Pressure CO2 Solubility in Crude Oil and CO2 Miscibility Effects on Oil Recovery Performance in Low-Permeability Reservoirs

The solubility of CO2 in crude oil is a crucial parameter that remarkably influences the flood performance of CO2 for low-permeability reservoirs. However, there is a considerable lack of data on CO2 solubility in crude oil under high-pressure conditions above 30 MPa in the existing literature, leaving a significant data gap. To address this deficiency, we measured the CO2 solubility in crude oil under sparsely explored high-pressure conditions (10–50 MPa) and across a broad temperature range (55–100 °C). Our findings revealed a nonlinear saturation trend in pressure dependence, deviating from the near-linear trends reported in prior studies. Using these data, we developed a novel empirical correlation for the CO2 solubility in crude oil prediction with a deviation of less than 10%, offering improved reliability for high-pressure applications. Additionally, nuclear magnetic resonance (NMR)-based CO2 flooding experiments provided new insights into the degree of oil utilization and dynamic production performance across different miscibility states. CO2 near-miscible flooding was recommended as a more viable option in practical applications compared to fully miscible flooding owing to its advantages of good oil recovery enhancement, low propensity for asphaltene precipitation, and relatively low injection cost. This study uniquely bridges the data gap in the existing literature regarding high-pressure CO2 solubility in crude oil and provides scientific guidance for the exploitation of CO2 flooding in low-permeability reservoirs.

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来源期刊
Energy & Fuels
Energy & Fuels 工程技术-工程:化工
CiteScore
9.20
自引率
13.20%
发文量
1101
审稿时长
2.1 months
期刊介绍: Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.
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