小井间距双井溶腔长期稳定性的模拟分析  

Simulation Analysis of Long-Term Stability of Two-Well Cavern with Small Spacing

作　　者：陈盛威 梁五星 郭玉平 程功 王同涛 Chen Shengwei;Liang Wuxing;Guo Yuping;Cheng Gong;Wang Tongtao(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400045,P.R.China;China Pingmei Shenma Group United Salt and Chemical Co.,Ltd.,Pingdingshan,Henan 467000,P.R.China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430000,P.R.China)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400045 [2]平煤神马集团联合盐化有限公司,河南平顶山467000 [3]中科院武汉岩土力学研究所,武汉430000

出　　处：《地下空间与工程学报》2025年第2期661-671,共11页Chinese Journal of Underground Space and Engineering

摘　　要：地下盐穴的稳定性研究对于我国地下储气库的广泛应用具有重要意义。通过FLAC3D模拟软件从体积收缩率、腔体顶板沉降量、相对塑性区体积3个角度探究井口间距和循环内压对盐岩储气库运行稳定性的影响,结果表明:井口间距为12 m或14 m时,双井溶腔运行30年后仍具有较好的长期稳定性;循环内压的变化会显著影响腔体的顶板沉降量等指标,综合考虑双井溶腔的运行安全性和经济性,建议储气库运行期间最低运行内压不低于8 MPa。讨论了井口间距对管柱单元沉降量及周围相对塑性区体积的影响,结果表明:在不超过20 m的情况下,井口间距的变化对管柱单元的影响不大。The stability of underground salt caverns plays an important practical role in the wide application of underground gas storage in China.By using FLAC3D simulation software,the effects of wellhead spacing and cyclic internal pressure on the operational stability of salt rock gas storage were explored from three perspectives:volume shrinkage rate,cavern roof settlement,and relative plastic zone volume.The simulation results showed that when the wellhead spacing is 12 m or 14 m,the two-well salt cavern still had good long-term stability after 30 years of operation.The change in cyclic internal pressure will significantly affect the indicators such as the settlement of the roof of the carven.Taking into account the safety and economy of the operation of the two-well salt cavern,the minimum operating internal pressure for gas storage operation should not be lower than 8 MPa.And the influence of wellhead spacing on the settlement of the pipe string unit and the volume of the surrounding relative plastic zone was discussed.The results showed that the change in wellhead spacing had little effect on the pipe string unit when it did not exceed 20 meters.

关 键 词：小井间距双井盐穴 井口间距 循环内压 管柱单元 数值模拟 

分 类 号：TE822[石油与天然气工程—油气储运工程]