页岩油储层压裂液渗吸作用机理

doi:10.7623/syxb202411007

石油学报 ›› 2024, Vol. 45 ›› Issue (11): 1652-1661.DOI: 10.7623/syxb202411007

• 油田开发 • 上一篇

页岩油储层压裂液渗吸作用机理

左罗^1,2,3, 张世昆^1,2, 沈子齐^1,2, 许国庆^1,2, 曾星航^1,2, 刘学鹏^1,2, 周朝^1,2, 杜娟^1,2

1. 中国石化页岩油气钻完井及压裂重点实验室北京 102206;
2. 中石化石油工程技术研究院有限公司北京 102206;
3. 中海油田服务股份有限公司油田生产事业部天津 300459

收稿日期:2024-03-29 修回日期:2024-08-19 发布日期:2024-12-03
作者简介:左罗,男,1988年9月生,2016年获中国科学院大学博士学位,现为中石化石油工程技术研究院有限公司副研究员,主要从事非常规油气开发及工程技术研究工作。Email:zuoluoxingfeng@163.com
基金资助:
页岩油气富集机理与高效开发全国重点实验室专项(KL22014)资助。第一作者及

Mechanism of fracturing fluid imbibition in shale oil reservoirs

Zuo Luo^1,2,3, Zhang Shikun^1,2, Shen Ziqi^1,2, Xu Guoqing^1,2, Zeng Xinghang^1,2, Liu Xuepeng^1,2, Zhou Chao^1,2, Du Juan^1,2

1. Sinopec Key Laboratory of Shale Oil and Gas Drilling and Hydraulic Fracturing, Beijing 102206, China;
2. Sinopec Research Institute of Petroleum Engineering Technology Co., Ltd., Beijing 102206, China;
3. Production Optimization Department, China Oilfield Services Limited, Tianjin 300459, China

Received:2024-03-29 Revised:2024-08-19 Published:2024-12-03

摘要/Abstract

摘要： 针对目前四川盆地复兴地区大规模水力压裂后压裂液渗吸(滞留)提采与伤害机制不清、焖井时间界限及高效压裂液体系优化方向不明确等问题,通过开展不同压裂液渗吸实验,对渗吸前后孔径、孔渗及核磁共振T₂谱进行对比分析,并进行压裂液与页岩油储层作用的分子动力学模拟,系统研究了页岩油储层压裂液渗吸作用机理。研究结果表明,孔隙度、小孔/微孔发育程度以及黏土矿物总含量、石英与伊/蒙混层含量对渗吸驱油效果有重要影响,孔隙度越大、小孔/微孔越发育,黏土矿物、石英及伊/蒙混层含量越高越有利于渗吸驱油;整体上渗吸作用有利于复兴地区页岩油储层扩孔、增渗及提采,优良的驱油压裂液会增加扩孔、增渗及提采效果70 % 及以上;含有氧乙烯基等非离子型官能团的压裂液体系对储层整体孔径分布区间有明显影响,微观上能100 % 将页岩油分子驱散并从有机质孔隙壁面剥离;确保239 h的渗吸滞留时间有利于减小储层伤害,使用含有氧乙烯基等非离子型官能团的压裂液体系会进一步减小储层伤害并提高渗吸驱油效果。

关键词: 页岩油, 压裂, 渗吸, 焖井时间, 储层伤害, 分子模拟

Abstract: This paper aims to the problems such as the unclear mechanisms behind fracturing fluid imbibition (retention) and its impact on oil recovery and reservoir damage in Fuxing area, as well as the undefined limits for imbibition time and undetermined direction for optimization of the efficient fracturing fluid systems. Through various imbibition experiments, comparative analyses of pore size, permeability, and NMR T₂ spectra before and after imbibition, and molecular dynamics simulations of interactions between fracturing fluids and shale oil reservoirs, the paper systematically investigates the mechanism of fracturing fluid imbibition in shale oil reservoirs. The results indicate that the porosity, development degree of micropores, total clay mineral content, and mixed-layer illite-smectite (I/S) content can significantly affect the effectiveness of imbibition oil recovery; higher porosity, higher development degree of micropores, and higher contents of clay minerals, quartz, and I/S are more favorable for imbibition oil recovery. Overall, imbibition can enhance pore expansion, permeability, and oil recovery in the Fuxing shale oil reservoir, and these performances can be improved by 70 % or more when using effective fracturing fluids. Fracturing fluids containing nonionic functional groups such as oxyethylene have a significant effect on the overall pore size distribution of the reservoir and can microscopically disperse shale oil molecules and strip them from the organic pore walls. Reservoir damage is minimized by ensuring a imbibition time of 239 h, and the use of fracturing fluids containing nonionic functional groups like oxyethylene can further reduces reservoir damage and enhance imbibition oil recovery.

Key words: shale oil, fracturing, imbibition, imbibition time, reservoir damage, molecular simulation

中图分类号:

TE312

左罗, 张世昆, 沈子齐, 许国庆, 曾星航, 刘学鹏, 周朝, 杜娟. 页岩油储层压裂液渗吸作用机理[J]. 石油学报, 2024, 45(11): 1652-1661.

Zuo Luo, Zhang Shikun, Shen Ziqi, Xu Guoqing, Zeng Xinghang, Liu Xuepeng, Zhou Chao, Du Juan. Mechanism of fracturing fluid imbibition in shale oil reservoirs[J]. Acta Petrolei Sinica, 2024, 45(11): 1652-1661.

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页岩油储层压裂液渗吸作用机理

Mechanism of fracturing fluid imbibition in shale oil reservoirs

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