层状盐岩地下储气库运行压力设定方法研究  

Setting method for operating pressure of underground gas storage bedded salt cavern

作　　者：陈祥胜 熊天恺 李银平[2] 施锡林[2] 周冬林 CHEN Xiangsheng;XIONG Tiankai;LI Yinping;SHI Xilin;ZHOU Donglin(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang,Jiangxi 330013,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;Salt Cavern of Gas Storage Technology Research Institute,PetroChina,Zhenjiang,Jiangsu 212000,China)

机构地区：[1]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,江西南昌330013 [2]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 [3]中国石油天然气股份有限公司盐穴储气库技术研究中心,江苏镇江212000

出　　处：《岩石力学与工程学报》2024年第5期1139-1151,共13页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(52208342,52122403);中国科学院青年创新促进会基金(2019324)。

摘　　要：盐岩地下储气库运行压力的设定不仅关乎其长期稳定性和密闭性,还影响储气规模和调峰能力,因此,确定运行压力区间对盐穴大规模储能具有重要的工程意义。以保障储库长期安全性为基本原则,总结、归纳以密闭性和稳定性为主控影响因素的上、下限运行压力设定准则,进而为运行压力设定提供依据。基于盐岩储气库围岩与存储介质之间的相互作用机制和运行压力设定准则,建立考虑损伤和渗透演化的流–固耦合分析模型,通过数值开发将其应用至金坛某实际盐岩储气库的密闭性和稳定性同步分析中,探讨储库围岩损伤和渗透率演化规律及影响因素,确定目标储库的几个关键设计参数,如运行压力区间、矿柱宽度、顶板厚度等。研究结果表明:运行压力对盐岩储气库的渗漏范围和蠕变收缩率的影响是截然相反的,其中,渗漏范围与运行压力呈正相关的幂函数关系,蠕变收缩率与运行压力呈负相关的指数函数关系,密闭性控制着储库上限压力,稳定性控制着储库下限运行压力。围岩损伤演化主要受应力水平和岩石变形性质影响,渗透率演化取决于有效平均应力和塑性损伤的竞争结果,只有当塑性损伤占主导影响时才可能诱发渗透率激增现象。考虑渗透参数演化比不考虑参数演化得到的气体渗漏范围大约5%,该影响主要集中在腔壁边界10 m范围。Operating pressure setting of underground salt cavern gas storage not only concerns its long-term stability and tightness,but also affects the gas storage scale and peak shaving capacity.Therefore,determining the operating pressure interval is of great engineering significance for large-scale energy storage in salt caverns.To provide a basis for the operating pressure setting,taking the long-term safety of the cavern storage as the principle,the criteria for setting the maximum and minimum operating pressure with tightness and stability as the main control factors are summarized respectively.Based on the interaction mechanism between the surrounding rock and storage medium in salt cavern gas storage and the ultimate operating pressure setting criteria,a coupled fluid-solid analysis model considering damage and permeability evolution is established and applied to the simultaneous analysis of tightness and stability of Jintan salt cavern gas storage reservoir through numerical development.The evolution laws and influencing factors of surrounding rock damage and permeability are discussed,and then several key design parameters of the target reservoir are determined,such as operating pressure interval,pillar width and salt roof thickness.The results show that the effects of operating pressure on the seepage range and creep shrinkage rate are diametrically opposed,in which the seepage range is positively correlated with the operating pressure in a power function relationship,and the creep shrinkage rate is negatively correlated with the operating pressure in an exponential function relationship.Therefore,the tightness determines the maximum operating pressure of a reservoir,and the stability controls the minimum operating pressure of a reservoir.Surrounding rock damage is mainly affected by stress level and rock deformation properties.Permeability evolution depends on the competing results of effective mean stress and plastic damage,and only when plastic damage dominates can the phenomenon of permeability surge be ind

关 键 词：岩石力学 盐岩储气库 运行压力 密闭性 稳定性 损伤–渗透演化 

分 类 号：TU45[建筑科学—岩土工程]