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<p>Underground salt cavern oil storage (SCOS) had long been recognized as a reliable method for underground&#xa0;large-scale oil storage, but traditional approaches, typically relying on single-well with oil(gas) blanket for single-cavern, proved unsuitable for high-impurity salt mines due to the accumulation of insoluble sediment&#xa0;particles. To address this, we developed a novel salt cavern&#xa0;construction method that utilized insoluble&#xa0;sediment voids at the cavern bottom for oil storage, which was called sediment void oil storage (SVOS). Evaluations demonstrated that this method improved construction efficiency and reduced costs while maintaining cavern&#xa0;stability and tightness. Stability analysis showed a maximum volume shrinkage&#xa0;ratio increase of 7.77% over 30&#xa0;years, and tightness assessments confirmed that interlayer permeability below 10<sup>−17</sup> m<sup>2</sup> effectively contained the stored oil. Sediment particles played a pivotal role in enhancing storage capacity, structural stability, and containment integrity. The construction&#xa0;cost of SVOS is lower than that of traditional SCOS. This innovative method offered significant potential for oil storage&#xa0;application in high-impurity salt mines and provided valuable insights for advancing large-scale underground storage solutions.</p>

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Feasibility analysis of a novel salt cavern oil storage (SCOS) construction method in high-impurity salt mines

  • 期刊论文

  • 发表日期：

    2025年7月28日

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  • Xinxing Wei,
  • Xilin Shi,
  • Yinping Li,
  • Liupeng Fu,
  • Yashuai Huang,
  • Hao Tian,
  • Xiaoyi Liu

摘要

Underground salt cavern oil storage (SCOS) had long been recognized as a reliable method for underground large-scale oil storage, but traditional approaches, typically relying on single-well with oil(gas) blanket for single-cavern, proved unsuitable for high-impurity salt mines due to the accumulation of insoluble sediment particles. To address this, we developed a novel salt cavern construction method that utilized insoluble sediment voids at the cavern bottom for oil storage, which was called sediment void oil storage (SVOS). Evaluations demonstrated that this method improved construction efficiency and reduced costs while maintaining cavern stability and tightness. Stability analysis showed a maximum volume shrinkage ratio increase of 7.77% over 30 years, and tightness assessments confirmed that interlayer permeability below 10−17 m2 effectively contained the stored oil. Sediment particles played a pivotal role in enhancing storage capacity, structural stability, and containment integrity. The construction cost of SVOS is lower than that of traditional SCOS. This innovative method offered significant potential for oil storage application in high-impurity salt mines and provided valuable insights for advancing large-scale underground storage solutions.