基于流变损伤的含夹层盐岩储库灾变研究

发布时间：2018-06-05 16:08

本文选题：流变损伤 + 层状盐岩　；参考：《河北工业大学》2015年硕士论文

【摘要】：盐岩是一种特殊的软岩,具有结构致密、孔隙度低、塑性变形能力大,非常低的渗透率、良好的蠕变行为和损伤自愈等特性,被国际上公认为是石油、天然气储备和放射性废物处置的理想场所。(1)本文通过盐岩的流变损伤三轴试验,研究了盐岩的流变损伤特性,尤其是盐岩在稳定蠕变和加速蠕变过程中表现出的损伤破坏特性。(2)使用PWIPP粘弹性蠕变模型和userc_d流变损伤模型,对盐岩的长期稳定性进行模拟研究,发现在两种模型计算下盐岩腔体的应力分布、变形规律、塑性损伤区域等都有趋势一致的规律,但是在userc_d模型计算下能有明显的损伤加速界限。(3)盐岩储库在动力荷载作用下,出现明显的应力重分布现象,腔体中间部位易发生拉伸破坏,底部、顶部易发生剪切破坏,且在较短的作用时间内腔体发生了较大的变形,且变形主要集中在腔体中间和腔体顶、底部位置。本文在结合前人对于腔体长期稳定性的研究,利用流变损伤模型userc_d和粘弹性模型PWIPP进行对比模拟计算,并利用层次分析法,对盐岩腔体在长期稳定性的表现进行量化分析,同时模拟腔体在动荷载作用下的表现分析盐岩腔体的灾变情况。
[Abstract]:Salt rock is a special kind of soft rock. It has the characteristics of compact structure, low porosity, large plastic deformation ability, very low permeability, good creep behavior and damage self healing. It is recognized as an ideal place for oil, natural gas reserve and radioactive waste disposal internationally. (1) this paper has studied the rheological damage of salt rock by three axis tests. The rheological damage characteristics of salt rock, especially the damage and failure characteristics of salt rock during the stable creep and accelerated creep process. (2) using the PWIPP viscoelastic creep model and the userc_d rheological damage model, the long-term stability of salt rock is simulated, and the stress distribution, deformation law and plasticity of the salt rock cavity are found under the two models. There is a consistent trend in the area of sexual damage, but it can have obvious damage acceleration limits under the calculation of userc_d model. (3) the stress redistribution phenomenon appears obviously under the dynamic load of the salt rock reservoir, and the middle part of the cavity is prone to tensile failure, the bottom and the top are prone to shear failure, and the cavity is within a short time of action. The deformation of the cavity is mainly concentrated in the middle of the cavity and the top of the cavity and the bottom position. In this paper, the rheological damage model userc_d and the viscoelastic model PWIPP are used to simulate the long-term stability of the cavity, and the expression of the salt rock cavity in the long-term stability is carried out by the analytic hierarchy process. At the same time, the catastrophe of salt rock cavity is analyzed by simulating the performance of the cavity under dynamic load.
【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】：TE88

【共引文献】