节理对盐岩储库流变损伤特性的影响分析

发布时间：2018-02-03 16:10

本文关键词： 蠕变损伤节理层状盐岩用户模型　出处：《河北工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：盐岩不同于一般的岩石,由于其具有裂隙少、孔隙率低、渗透率低、流变性强、损伤恢复等工程性质,盐岩层已成为国际上公认的建造天然气、石油地下储库的理想场所。国外天然气储库发生火灾、爆炸、塌陷的事故已经不少,造成极大的人员及财产损失,很多事故是由盐岩流变损伤引起的。然而,我国对地下盐岩储库的研究起步较晚,且对带节理盐岩的研究鲜有见刊。根据我国盐岩矿床大多呈层状分布,且盐岩地层中多含有夹层的特点,本文研究了节理对含夹层盐岩储库流变损伤特性的影响。首先,研究了盐岩的物理力学性质、流变损伤性质和流变损伤模型。其次,利用ANSYS软件提供的二次开发工具UPFs,将王贵君教授的盐岩流变损伤耦合模型——userc_d模型,编写为可直接被ANSYS调用的用户子程序;在ANSYS环境中建立模拟盐岩三轴压缩蠕变试验的试样数值模型,并验证模型的正确性。最后,用ANSYS分别建立不带节理和带节理盐岩储库模型,并将开发的用户子程序用于储库模型的数值模拟分析中。通过对比分析不带节理模型和带节理模型的围岩在变形和损伤等方面的差异,得出节理对盐岩储库洞室的流变损伤特性的影响规律;同时还分析了天然气内压对储库流变损伤特性的影响规律。本文借助有限元软件ANSYS的二次开发功能,研究了节理对盐岩储气库洞室在变形和损伤等方面的影响规律,这是本文的创新点。
[Abstract]:Salt rock is different from common rock, because of its engineering properties, such as less cracks, low porosity, low permeability, strong rheology, damage recovery and so on, salt rock has become an internationally recognized natural gas construction. Oil underground storage of the ideal place. Foreign natural gas storage fires, explosions, collapses have been a lot of accidents, resulting in a great deal of personnel and property losses, many accidents are caused by the rheological damage of salt rock. However. The study of underground salt reservoir in China started late, and the study of zone joint salt rock was rarely published. According to the characteristics of stratiform distribution of salt rock deposits in China, most salt strata contain intercalation. In this paper, the effects of joints on the rheological damage characteristics of intercalated salt reservoirs are studied. Firstly, the physical and mechanical properties, rheological damage properties and rheological damage models of salt rock are studied. By using the secondary development tool UPFsprovided by ANSYS software, the coupled model of rheological damage of salt rock by Professor Wang Guijun, the usercSP model, is presented. Write a user subprogram that can be called directly by ANSYS; The numerical model of specimen simulating triaxial compression creep test of salt rock is established in ANSYS environment, and the correctness of the model is verified. Finally, the storage model of salt rock without joint and with joint is established by ANSYS, respectively. The developed user subprogram is used in the numerical simulation analysis of the storage model. The differences in deformation and damage of surrounding rock without joint model and with joint model are analyzed by comparison. The influence of joints on the rheological damage characteristics of salt reservoir caverns is obtained. At the same time, the influence of internal pressure of natural gas on the rheological damage characteristics of reservoir is analyzed. The secondary development function of finite element software ANSYS is used in this paper. The influence of joints on the deformation and damage of salt reservoir caverns is studied, which is the innovation of this paper.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU45

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