变权和相对差异函数在盐穴储气库腔体稳定性评价中的应用

Application of variable weight theory and relative difference function to evaluating stability of salt cavern for underground gas storage

盐岩地下储气库腔体以钻井水溶方式开采,溶腔形态可见性差、形态发展可控性难度高,针对畸形溶腔进行科学的稳定性评价是保证其安全运营的重要手段。将变权和相对差异函数理论引入到盐岩溶腔的安全评价中,建立适用于盐穴储气库畸形单腔的稳定性评价模型,首次以溶腔声纳测腔数据为基础,建立三维真实仿真模型并进行数值模拟,将数值模拟结果作为评价指标的评分依据,最后应用该方法对金坛储气库某腔体进行稳定性评价,并针对评价结果提出安全改善措施。研究结果表明,用变权方法对评价指标权重进行处理后得到的结果更加合理,通过将该方法与其他安全评价方法计算结果进行对比,证明了该模型在盐岩储气库畸形溶腔的稳定性评价中具有较好的适用性。

The underground gas storage in salt caverns, mined by drilling and water dissolving solution, has low visibility and high difficulty of cavern form controllability, so it is a very significant measure to carry out scientific stability evaluation on deformed gas storage for ensuring its safe operation. In this study, the variable weight theory and relative difference function are introduced to build the assessment model which can be suitable for salt cavern stability assessment. Based on the sonar data of salt cavern shape, the 3D model is built up firstly in numerical simulation calculation, and the simulation results are used as the marking standard of relational assessment index. This model is applied to the stability assessment process of some salt cavern in Jintan; and improving measures for safety are carried out on the basis of assessment results. By a comparison of these results with some others, it is shown that the stability assessment model is more reasonable, as the evaluation index weight has been recalculated by variable weight theory; and this method has relatively better applicability in cavern stability assessment of gas storage in salt cavern.