水-甲烷-二氧化碳-碳系统润湿性的分子模拟研究

雍唯; 未志杰; 刘玉洋; 王德强; 崔永正; 张健; 周文胜

doi:10.3969/j.issn.1006-6535.2025.02.011

特种油气藏 >

2025 , Vol. 32 >Issue 2: 89 - 94

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.02.011

油藏工程

水-甲烷-二氧化碳-碳系统润湿性的分子模拟研究

雍唯 ,
未志杰 ,
刘玉洋 ,
王德强 ,
崔永正 ,
张健 ,
周文胜

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1.海洋油气高效开发全国重点实验室,北京 100028;
2.中海油研究总院有限责任公司,北京 100028

雍唯(1994—),男,工程师,2016年毕业于西南石油大学石油工程专业,2021年毕业于英国阿伯丁大学石油工程专业,获博士学位,现主要从事油藏润湿性分子模拟、聚合物驱提高采收率等方面的研究工作。

收稿日期: 2024-07-27

修回日期: 2025-02-20

网络出版日期: 2025-06-16

基金资助

国家自然科学基金面上项目“基于非均衡理论的海上稠油化学驱大幅提高采收率关键问题研究”(52074347)

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Molecular simulation of wettability of water-methane-carbon dioxide-carbon system

YONG Wei ,
WEI Zhijie ,
LIU Yuyang ,
WANG Deqiang ,
CUI Yongzheng ,
ZHANG Jian ,
ZHOU Wensheng

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1. National Key Laboratory of Efficient Offshore Oil and Gas Development, Beijing 100028, China;
2. CNOOC Research Institute Co., Ltd., Beijing 100028, China

Received date: 2024-07-27

Revised date: 2025-02-20

Online published: 2025-06-16

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摘要

针对分子尺度下润湿性研究难以开展的问题,运用分子模拟方法,探究了页岩纳米孔隙中液滴与甲烷-二氧化碳-碳系统相互作用后的润湿性表现(润湿性通过表面张力和润湿角表征)。结果表明:CO₂分子数占比X_CO₂对CH₄-CO₂-H₂O系统表面张力γ影响显著,γ随温度上升和X_CO₂增加而降低,降幅最高约40%。进一步得到液滴润湿角随CH₄和CO₂压力的变化曲线,发现在CH₄环境中压力超过78 MPa时,液滴脱离固体表面,形成180°润湿角,此时页岩孔隙表面达到完全疏水状态,而在CO₂环境中,页岩表面完全疏水的对应压力为12 MPa,模拟结果与相关实验数据一致。与CH₄相比,CO₂与页岩表面有着更强的相互作用,从而置换出附着在固体表面的CH₄,提高了气体采收率。对于CH₄-CO₂混合物,润湿角则与CO₂分子数占比成线性正相关的关系。研究成果可为揭示润湿性与页岩提高采收率之间的关系提供理论指导。

关键词： 水-甲烷-二氧化碳-碳系统; 润湿性; 接触角; 分子模拟; 提高采收率; 页岩

本文引用格式

雍唯 , 未志杰 , 刘玉洋 , 王德强 , 崔永正 , 张健 , 周文胜 . 水-甲烷-二氧化碳-碳系统润湿性的分子模拟研究[J]. 特种油气藏, 2025 , 32(2) : 89 -94 . DOI: 10.3969/j.issn.1006-6535.2025.02.011

Abstract

To address the difficulty in conducting wettability studies at the molecular scale,molecular simulation methods were employed to investigate the wettability behavior of droplets in shale nanopores after interaction with the methane-carbon dioxide-carbon system (wettability was characterized by surface tension and contact angle).The results show that the proportion of CO₂ molecules, X_CO₂,significantly affects the surface tension γ of the CH₄-CO₂-H₂O system.The surface tension γ decreases with increasing temperature and X_CO₂,with a maximum reduction of approximately 40%.Further analysis revealed the variation of droplet contact angle with changes in CH₄ and CO₂ pressure.It was found that in a CH₄ environment,when the pressure exceeds 78 MPa,the droplet detaches from the solid surface,forming a contact angle of 180°,indicating that the shale pore surface reaches a completely hydrophobic state. In a CO₂ environment,the corresponding pressure for the shale surface to become completely hydrophobic is 12 MPa.The simulation results are consistent with relevant experimental data. Compared to CH₄, CO₂ exhibits stronger interaction with the shale surface, thereby displacing CH₄ attached to the solid surface and enhancing gas recovery.For CH₄-CO₂ mixtures, the contact angle shows a linear positive correlation with the proportion of CO₂ molecules.The research findings provide theoretical guidance on the relationship between wettability and enhanced recovery in shale.

Key words： water-methane-carbon dioxide-carbon system; wettability; contact angle; molecular modeling; enhanced recovery; shale

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