杂质盐岩渗透特性试验研究

发布时间：2018-01-13 12:27

本文关键词：杂质盐岩渗透特性试验研究　出处：《岩石力学与工程学报》2017年10期 　论文类型：期刊论文

【摘要】：利用四川大学THMC岩石三轴试验系统,针对中国天然气储库杂质盐岩开展全过程渗透试验研究,并通过试验结果拟合出同时考虑围压、扩容体积应变以及杂质含量的多因素耦合杂质盐岩渗透模型。研究表明:杂质含量、杂质分布及成分对盐岩渗透性均有显著影响,不同杂质含量盐岩损伤恢复后渗透率均有所降低,其塑性变形可分为2个阶段,I阶段渗透率增长迅速,II阶段渗透率增速减缓甚至渗透率下降,盐岩破坏后渗透率明显增大,残余阶段能维持在相对稳定的水平;低渗夹层制约盐岩垂向渗透性,而泥质成分盐岩较钙芒硝质盐岩渗透率更低。由拟合的多因素耦合渗透模型可得到:围压越高渗透率越低,扩容体积应变越大渗透率越高。当杂质含量大于0.46时,渗透率随杂质含量的增大而增大,当杂质含量小于0.46时,渗透率随杂质含量的增大而减小。
[Abstract]:Based on the THMC rock triaxial test system of Sichuan University, the permeation test of impurity salt rock in natural gas reservoir in China was carried out during the whole process, and the confining pressure was also considered by fitting the test results. The study shows that impurity content, impurity distribution and composition have significant influence on the permeability of salt rock. The permeability of salt rock with different impurity content decreases after damage recovery, and its plastic deformation can be divided into two stages: the permeability increases rapidly in the first stage, and the permeability growth slows down in the second stage and even decreases in the second stage. The permeability of salt rock increases obviously after failure, and the residual stage can be maintained at a relatively stable level. Low permeability intercalation restricts the vertical permeability of salt rock, while the permeability of argillaceous salt rock is lower than that of glauberite salt rock. When the impurity content is greater than 0.46, the permeability increases with the increase of impurity content, while when impurity content is less than 0.46, the permeability decreases with the increase of impurity content.
【作者单位】：四川大学建筑与环境学院;德国克劳斯塔尔工业大学石油天然气工程研究所;四川大学水力学与山区河流开发保护国家重点实验室;四川大学水利水电学院;
【基金】：国家自然科学基金资助项目(51374147,51374148) 四川省青年基金项目(2017JQ0003)~~
【分类号】：TU45
【正文快照】： 盐岩因其拥有的极低渗透性、致密性、损伤自愈性等良好特性,为储层(油、气)、危险和放射性废物处理提供了极好的储存介质。近年来,德国、法国、美国等欧美国家已经将很多废弃的盐井矿投入利用作为的石油、天然气等能源的地下储存库[1]。我国盐岩储气库则发展相对较晚,国内首座

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