石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (2): 477-488.doi: 10.11743/ogg20220219

• 方法技术 • 上一篇    

纳米压痕技术在页岩力学性质表征中的应用进展

王建丰1,2,3(), 杨超4, 柳宇柯5, 熊永强1,3()   

  1. 1.中国科学院 广州地球化学研究所 有机地球化学国家重点实验室,广东 广州 510640
    2.中国科学院大学,北京 100049
    3.中国科学院 深地科学卓越创新中心,广东 广州 510640
    4.中国科学院 广州能源研究所 天然气水合物重点实验室,广东 广州 510650
    5.中国石油 勘探开发研究院,北京,100083
  • 收稿日期:2020-11-19 修回日期:2022-01-20 出版日期:2022-04-01 发布日期:2022-03-11
  • 通讯作者: 熊永强 E-mail:wangjianfeng@gig.ac.cn;xiongyq@gig.ac.cn
  • 作者简介:王建丰(1992—),男,博士研究生。页岩微观力学性能和地球化学。E?mail: wangjianfeng@gig.ac.cn
  • 基金资助:
    中国科学院战略重点研究项目专项基金项目(XDA14010102);国家自然科学基金项目(41802165);中国科学院广州地球化学研究所有机地球化学国家重点实验室开放基金项目(SKLOG202012)

Review on the application of nanoindentation to study of shale mechanical property

Jianfeng Wang1,2,3(), Chao Yang4, Yuke Liu5, Yongqiang Xiong1,3()   

  1. 1.State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou, Guangdong 510640, China
    2.University of Chinese Academy of Sciences, Beijing 100049, China
    3.Center for Excellence in Deep Earth Sciences, CAS, Guangzhou, Guangdong 510640, China
    4.Key Laboratory of Natural Gas Hydrate, Guangzhou Institute of Energy Conversion, CAS, Guangzhou, Guangdong 510650, China
    5.Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
  • Received:2020-11-19 Revised:2022-01-20 Online:2022-04-01 Published:2022-03-11
  • Contact: Yongqiang Xiong E-mail:wangjianfeng@gig.ac.cn;xiongyq@gig.ac.cn

摘要:

近年来,随着力学测试技术的不断发展,微观材料科学研究中广泛应用的纳米压痕技术被引入到页岩研究领域,成为测试页岩表面微观力学性质的重要手段。从微观视角去研究页岩的力学性能已成为当下的研究热点之一。为此,梳理了页岩样品的制备方法和压痕试验制度对测试结果的影响,详细论述了纳米压痕技术在页岩中微观力学和蠕变性能表征方面的应用现状,对其应用的优势和存在的问题进行了分析和讨论,并对发展趋势进行了展望。研究结果表明:①纳米压痕技术可以精确表征页岩整体以及基质组成相的力学性能;②通过研究保载阶段的位移-时间曲线可以获得页岩微观尺度的蠕变特征,深入理解微观下页岩蠕变变形机制;③测试流体/页岩相互作用下力学性能的演变特征,可以为实际页岩水力压裂或超临界二氧化碳压裂提供基础的实验数据。该技术实现了对页岩更精细化的观测,有助于从根本上认识页岩的力学行为,为页岩气勘探开发提供更可靠的理论依据。

关键词: 试验制度, 微观力学性能, 蠕变特征, 流体/页岩相互作用, 纳米压痕技术, 储层压裂, 页岩

Abstract:

With the development of mechanical testing technology in recent years, the nanoindentation, a technique wildly recognized in micro-fabrication materials research, has been introduced into shale study, and become an important tool to test the micro-mechanical properties of shale. At present, it has been one of the hot research topics to study the mechanical properties of shale from the microscopic perspective. In this study, we summarize the influences of shale sample preparation methods and nanoindentation test system on test results, elaborate the application of nanoindentation technique in micro-mechanical and creep rupture characterization of shale. The advantages and existing problems of this technique are thereby analyzed and discussed, while looking to its development trend. The results are shown as follows. First, the technique can serve for precisely characterizing the mechanical properties of the bulk shale and its matrix phases. Second, the micro-creep rupture behavior of shale can be obtained by studying the displacement-time curve during the loading stage, which is of significance to having an in-depth understanding on the creep rupture deformation mechanism of shale in micro view. Third, testing the evolution characteristics of micro mechanical properties of fluid/shale interactions can provide basic experimental data for actual hydraulic fracturing or supercritical carbon dioxide fracturing of shale. In all, the nanoindentation technique serves to get an even finer understanding of shale in micro level, which is conducive to analyzing the mechanical behavior of shale in essence, and provide theoretical basis more reliable for the exploration and development of shale gas.

Key words: test system, micro mechanical property, creep rupture behavior, fluid/shale interaction, nanoindentation, reservoir fracturing, shale

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