陈加松,白雪峰,王桂九,等. 盐穴储气库水平多步法造腔模拟试验[J]. 油气储运,2025,44(4):1−9.
引用本文: 陈加松,白雪峰,王桂九,等. 盐穴储气库水平多步法造腔模拟试验[J]. 油气储运,2025,44(4):1−9.
CHEN Jiasong, BAI Xuefeng, WANG Guijiu, et al. Research on horizontal multi-step cavity construction for salt cavern gas storage based on simulation experiments[J]. Oil & Gas Storage and Transportation, 2025, 44(4): 1−9.
Citation: CHEN Jiasong, BAI Xuefeng, WANG Guijiu, et al. Research on horizontal multi-step cavity construction for salt cavern gas storage based on simulation experiments[J]. Oil & Gas Storage and Transportation, 2025, 44(4): 1−9.

盐穴储气库水平多步法造腔模拟试验

Research on horizontal multi-step cavity construction for salt cavern gas storage based on simulation experiments

  • 摘要:
    目的 中国的盐岩地层多为层状薄盐层,常规单井单腔的建库技术已不能满足高效建设大尺寸盐腔的需求,应用盐穴储气库水平多步法造腔技术可以实现在有限厚度的盐岩层中建设更大体积的盐腔。
    方法 通过探究水平多步法造腔关键参数对于最终成腔形态的影响,并对腔体形态与造腔过程进行工程分析,给出了水平多步法造腔关键参数的推荐值。为探究水平多步法造腔时的腔体扩展规律,设计了水平多步法造腔的物理模拟试验装置。通过设置不同造腔参数的物理模拟试验,得到了不同形态的水平腔。利用三维扫描技术,将试验所得腔体通过镜像操作构建出完整的3D腔体模型。
    结果 通过对不同造腔参数所得到的3D腔体模型进行分析可知:在形成的腔体体积相同的情况下,注水流量的改变对腔体高度、腔体长度及腔体最大宽度影响较大;退管距离的改变主要对腔顶形状的影响较大,对腔体尺寸的影响并不显著;造腔过程中充入气垫保护顶板会使得腔体呈现“平顶型”,不仅影响腔体稳定性,还会增大造腔经济成本。
    结论 水平多步法造腔的合理注水排量可能为160 ~240 m3/h,可设置较小退管距离,造腔过程中不宜全程充入阻溶剂保护腔顶。研究结果可为盐穴储气库水平多步法造腔的腔体形态设计与工艺参数优化提供借鉴与指导。

     

    Abstract:
    Objective Given that most salt rock strata in China consist of thin-layered salt formations, conventional single-well and single-cavity construction technologies are no longer adequate for the efficient construction of large-size salt cavities. In this context, the application of horizontal multi-step cavity-building technology for salt cavern gas storage can enhance the construction of salt cavities with expanded volumes in salt rock strata of limited thickness.
    Methods This study explored the influence of key parameters on the final shapes of cavities created through the horizontal multi-step cavity-building approach and analyzed both the cavity shape and the construction process from an engineering perspective, thus presenting recommended values for these key parameters. A physical simulation experimental setup was designed to examine cavity expansion patterns during horizontal multi-step cavity construction. Subsequent experiments incorporated various cavity-building parameters to generate horizontal cavities of different shapes. Finally, 3D scanning technology was employed to create complete 3D cavity models based on the cavities obtained from the experiments through mirroring operations.
    Results The following results were derived from analyzing these 3D cavity models corresponding to various cavity-building parameters. For cavities with equal volumes, variations in water injection flow rates had a significant influence on their height, length, and maximum width. Tubing withdrawal distances had a major impact on the shape of the cavity roofs, while their effect on the overall size of the cavities was relatively minor. Additionally, the air cushion used during cavity construction to protect the roofs resulted in “flat top” shapes, which not only affected the stability of the cavities but also increased the economic costs for cavity construction.
    Conclusion Water injection rates ranging from 160 m3/h to 240 m3/h are considered rational for horizontal multi-step cavity building. It is recommended to use small tubing withdrawal distances. Additionally, continuous injection of dissolution inhibitors during construction for cavity roof protection is not advised. The research results offer valuable references and guidance for shape design and process parameter optimization of cavities using the horizontal multi-step construction approach for salt cavern gas storage.

     

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