摘要
盐穴型储气库腔体分布相对集中,埋深较浅,可能会造成严重的地表沉陷效应,影响生产建设和安全。基于Eickemeier模型对单个盐腔及多个盐腔地表沉降规律进行研究,对埋深、蠕变、多腔叠加这些重要影响因素对比分析。结果表明:Eickemeier模型预测结果符合单腔沉降、水平变形规律;腔体埋深和蠕变率对地表沉降影响很大,储气库设计时可以适当增加埋深,且应避免过高的蠕变率;合理提高腔间距可以大大减弱多个盐腔相互作用造成的地表集中沉降;当临近盐腔由于事故造成腔体严重收缩时,地表沉陷将集中在该盐腔附近,可以据此排查出事故盐腔位置。最后预测了国内某盐穴储气库群运行30年的地表最大沉降量为84.3 mm,水平位移为10.4 mm。
The distribution of salt cavern gas storage is relatively concentrated and the burial depth is relatively shallow,which may cause serious surface subsidence effect and affect the production and safety.The Eickemeier model was used to study the surface settlement law of single salt cavern and multiple salt cavern,and the important influencing factors such as burial depth,creep and settlement superposition of many caverns were compared and analyzed.The results show that the predicted results of the Eickemeier model accord with the rules of settlement and horizontal deformation of a single salt cavern.Buried depth and creep rate of cavern have great influence on surface subsidence.When designing salt cavern gas storage,the buried depth can increase appropriately,and the high creep rate should be avoided to improve the stability.Increasing the distance between salt caverns can obviously reduce the surface subsidence caused by the interaction of multiple salt caverns.When the adjacent salt cavern is severely contracted due to the accident,the surface subsidence will be concentrated near the salt cavern,so the location of the salt cavern where the accident occurred can be easily identified.Finally,the maximum surface subsidence and horizontal displacement of a gas storage group in China during 30 years of operation are estimated to be 84.3 mm and 10.4 mm respectively.
作者
刘冰冰
武志德
丁国生
李康
孟芳
Liu Bingbing;Wu Zhide;Ding Guosheng;Li Kang;Meng Fang(Research Institute of Petroleum Exploration and Development,Beijing 100083,P.R.China;CNPC Key Laboratory of Oil and Gas Underground Storage Engineering,Beijing 100083,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2022年第S01期418-425,共8页
Chinese Journal of Underground Space and Engineering
基金
国家重点研发计划项目(2017YFC0805801)
中国石油天然气股份有限公司直属院所基础研究和战略储备技术研究基金项目(2019D-500811)
