盐岩储气库温度-渗流-应力-损伤耦合模型研究

推导了含夹层盐岩储气库在地应力、注-采气压力和温度联合作用下的温度-渗流-应力（THM）-损伤耦合数学模型，该模型不仅包含了盐岩的热损伤效应，还考虑了气体渗透的Klinkenberg效应以及气体沿夹层层面流动对渗透规律的影响。在此基础上，结合金坛储气库建设，采用数值仿真技术，对储气库在注-采气过程中考虑THM耦合与不耦合情况下的气体渗透、温度分布以及应力分布规律进行了详细的对比分析和探讨，研究结果表明：含夹层盐岩储气库应力-渗透-温度耦合效应十分明显。该问题的研究，为全面深入分析盐岩储气库的安全性和实用性提供了思路及前提，具有重要的理论及实践意义。

Study of THM-damage coupling model of gas storage in salt rock with interlayer

Because of the properties of salt rock and particularity of the geographical location of gas storage, there are few studies of the THM coupling model for gas storage in salt rock. Based on the work of THM coupling model of J. Noorishad and C. F. Tsang who is in charge of DECOVALEX in U.S., the mathematic THM-damage coupling model is derived under geostress, injection and production gas pressure and temperature, according to our experimental data of salt rock and our study of gas seepage regulation of gas storage in salt rock with interlayer. In this model, thermal injury effect of salt rock and the Klinkenberg effect of gas seepage are considered. The effect of gas flow along the interlayer surface on the seepage regulation is also considered. Based on it and according to the construction of Jintan gas storage, numerical technology is adopted to get the gas seepage, temperature and stress distribution regulation considering the coupling and uncoupling THM effect, in the process of injection and production. From the detailed comparative analysis, it is concluded that the coupling effect is very significant for gas storage in salt rock with interlayer. This study provides an ideal and premise for the safety and practicably analysis of gas storage in salt rock. This study has an important theoretical and practical meanings.