天然气地球科学 ›› 2022, Vol. 33 ›› Issue (4): 495511.doi: 10.11764/j.issn.1672-1926.2021.12.001
• 天然气开发 • 下一篇
任岚1(),吴建军2,林然1(),赵金洲1,谭秀成1,吴建发3,宋毅3
Lan REN1(),Jianjun WU2,Ran LIN1(),Jinzhou ZHAO1,Xiucheng TAN1,Jianfa WU3,Yi SONG3
摘要:
实验与理论研究表明,在水力压裂与页岩油气储层开发生产过程中,地层应力和孔隙压力的多重变化,特别是天然裂缝的破坏,可能使页岩储层渗透率发生显著变化。但目前对页岩渗透率变化规律分析的理论方法较少。基于离散元方法,首先建立了标准圆柱页岩数值岩心模型,采用美国Bakken页岩真实岩心实测数据对数值岩心进行了校准,使其岩石力学特征和渗流特性与真实岩心保持一致,在此基础上,重构了正方体页岩数值岩心,实现了从圆柱岩心向正方体岩心数值实验延伸。正方体数值岩心可开展真三轴加载下的页岩渗透率数值实验测试,并可模拟不同天然裂缝发育条件下三轴应力变化对页岩内天然裂缝破坏以及渗透率的影响。研究结果表明:不发育天然裂缝的页岩渗透率随着三轴应力增大而降低,随孔隙压力增大而升高;发育有天然裂缝的页岩渗透率与天然裂缝分布特征及其破坏情况密切相关,整体上随着三轴应力的增大呈现出“先降低—后陡增—再降低”的变化趋势。提出的页岩岩心数值实验方法对研究页岩渗透率敏感性的内在机制与外在表现特征具有重要参考作用,对页岩气压裂设计与高效开发具有重要的理论指导意义和矿场应用价值。
中图分类号:
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