岩土力学 2017, 38(8) 2241-2248 DOI:     ISSN: 1000-7598 CN: 42-1199/O3

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本文关键词相关文章
盐穴储气库
易碎泥岩夹层
环氧树脂
人工合成试样
渗透率测试
本文作者相关文章
PubMed
盐穴储气库泥岩夹层渗透性测试新方法
尹洪武1, 2,马洪岭1,施锡林1,杨春和1
1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071;2. 中国科学院大学,北京 100049
摘要: 金坛盐穴储气库现场压井试验发现某泥岩夹层密封性欠佳,可能影响储气库运行的密闭性,钻井取芯情况表明,该夹层易破碎,难以开展系统的渗透性测试试验。针对该问题,提出了一种测试易碎泥岩夹层渗透率的新方法,将泥岩夹层岩芯浇筑在环氧树脂中,通过切割打磨等工序制备出符合渗透试验要求的标准试样。为了观测泥岩夹层岩芯与环氧树脂的胶结情况,对人工合成试样进行了镀金电镜扫描试验,发现交界面孔隙较岩石孔隙小、胶结良好,说明夹层岩芯是人工合成试样中的主要渗透通道。利用稳态法对人工合成试样进行渗透率测试,测试结果与其他学者的测试结果吻合,证实了该方法的可靠性。同时开展了理论分析,结果表明,浇筑式方法测得的渗透率与理论结果相符,从理论上进一步证实了其可行性。文中所述的泥岩夹层渗透性测试方法,对测试不规则破碎岩芯的渗透率具有一定参考意义。
关键词 盐穴储气库   易碎泥岩夹层   环氧树脂   人工合成试样   渗透率测试  
A new method for permeability test on mudstone interlayer in a salt cavern gas storage
YIN Hong-wu1, 2, MA Hong-ling1, SHI Xi-lin1, YANG Chun-he1
1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract: Permeability of mudstone interlayer is an important factor to evaluate the sealing property of salt cavern gas storage. The permeability of a certain mudstone interlayer in Jintan is relatively high according to pressure tests, and thus it is inappropriate for the sealing performance. Since the borehole cores of mudstone interlayer are easy to be broken, it is substantially difficult to carry out systematic permeability tests. To solve the problem, we proposed a new method for testing the permeability of brittle mudstone interlayer. The brittle interlayer cores tightly wrapped by epoxy resin were cut and polished to prepare standard samples for meeting the requirement of permeability tests. To observe the cement situation of the mudstone interlayer cores and the epoxy resin, the synthetic samples are carried out by scanning electron microscope (SEM). It is found that the pore of the interface is lower than that of rock and the interface cement as well, which shows that the interlayer core is the main seepage channel of synthetic samples. The results of permeability tests on synthetic samples by using a steady-state method are consistent with other results in the literature, which proves the reliability of this new method. The theoretical analysis also shows that the permeability results measured by the new method are consistent with the theory, and thus the feasibility of the method is verified theoretically. The new method of testing the permeability of mudstone interlayer proposed is feasible and reliable. This method has a certain reference value for the test of the permeability of the irregular brittle core.
Keywords: salt cavern gas storage   brittle mudstone interlayer   epoxy resin   synthetic sample   permeability test  
收稿日期 2016-06-08 修回日期  网络版发布日期  
DOI:
基金项目:

国家自然科学基金资助项目(No. 41472285,No. 51404241,No. 41602328)。

通讯作者: 施锡林,男,1983年生,博士,助理研究员,主要从事盐岩工程力学特性及盐穴储库水溶造腔方面的研究工作。 E-mail:xlshi@whrsm.ac.cn
作者简介: 尹洪武,男,1990年生,博士研究生,主要从事盐穴地下储气库方面的研究工作。
作者Email: yinhongwu14@mails.ucas.ac.cn

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