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纳米SiO2强化CO2地质封存页岩盖层封堵能力机制试验
李颖1,李茂茂1,李海涛1,周军平2,LEONHARDGanzer3,罗红文1,康夫馨4
(1.西南石油大学油气藏地质及开发工程国家重点实验室,四川成都 610500;2.重庆大学资源与安全学院,重庆 400030;3.Institute of Subsurface Energy Systems, Clausthal University of Technology, Agricolastrae 10, Clausthal-Zellerfeld 38678;4.云南省天然气销售有限公司,云南昆明 650100)
摘要:
页岩为CO2盐水层地质封存常见盖层岩石类型,强化盖层封堵能力有利于提高CO2地质埋存量和安全性。为探究随CO2混注纳米SiO2(SNPs)强化盖层封堵能力的有效性和可行性,对CO2地质封存页岩盖层样品开展原地条件下的超临界CO2酸蚀反应试验,基础组为页岩样品-地层水、对照组为页岩样品-地层水+超临界CO2、优化组为页岩样品-地层水+SNPs+超临界CO2,并采用核磁共振测试、场发射扫描电镜可视化观测、X射线衍射测试和岩石力学试验,探究CO2酸蚀反应前后的页岩孔隙结构、表面形貌、矿物成分及力学性质特征。结果表明:优化组的大孔孔隙分量及孔隙度和渗透率增大幅度低于对照组;与对照组相比,优化组黏土矿物与碳酸盐岩矿物相对含量损失少,表明随CO2混注SNPs可使岩样内部酸蚀作用减弱;SNPs在岩石端面吸附聚集或进入岩心孔喉,可使优化组页岩样品力学性能损伤程度降低;随CO2混注SNPs有利于强化CO2盐水层地质封存盖层封堵能力。
关键词:  CO2地质封存  纳米二氧化硅  超临界CO2  盖层封堵能力
DOI:10.3969/j.issn.1673-5005.2024.02.010
分类号::TE 357.7
文献标识码:A
基金项目:国家自然科学基金面上项目(42272176);国家自然科学基金中德合作交流项目(M0469)
Experiment on nano-SiO2 enhancing sealing capacity of shale caprocks for CO2 geological storage
LI Ying1, LI Maomao1, LI Haitao1, ZHOU Junping2, LEONHARD Ganzer3, LUO Hongwen1, KANG Fuxin4
(1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation in Southwest Petroleum University, Chengdu 610500, China;2.School of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China;3.Institute of Subsurface Energy Systems,Clausthal University of Technology, Agricolastrae 10, Clausthal-Zellerfeld 38678, Germany;4.Yunnan Natural Gas Sales Company Limited, Kunming 650100, China)
Abstract:
Shale is a common type of caprock for geological storage of CO2 in brine aquifers, and the enhancement of the caprock sealing capacity is beneficial to improve the storage safety. In this study, in order to investigate the effectiveness and feasibility to enhance the sealing capacity with mixed injection of CO2 and nano-SiO2 (SNPs), three reaction experiments of shale caprock samples and supercritical CO2 were conducted under reservoir conditions, including the basic experiment group for reactions between shale sample and formation water, the control experiment group for reactions among shale sample, formation water and supercritical CO2, and the optimization group for reactions among shale sample, formation water, SNPs, and supercritical CO2. The pore structure, surface morphology, mineral composition and mechanical properties of shale samples before and after the three reaction experiments were evaluated using NMR, field emission scanning electron microscope visual observation, X-ray diffraction and rock mechanics testing techniques. The results show that the increasements of macro pore components, porosity and permeability in the optimization group were lower than those in the control group after the reaction experiments. Compared with the control group, the relative content loss of clay and carbonate minerals in the optimization group was also less, indicating that CO2 mixed with SNPs can weaken the internal acid erosion of rock samples. SNPs can be adsorbed and accumulated on the end face of the pores and enter the pore throats, which can lessen mechanical and chemical damage of shale samples, demonstrating that SNPs mixed with CO2 can be beneficial for enhancing the caprock 's sealing capacity for CO2 geological storage in brine aquifers.
Key words:  CO2 geological storage  nano-SiO2  supercritical CO2  caprock sealing capacity
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