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Comprehensive weighted matter-element extension method for the safety evaluation of underground gas storage

机译：地下储气库安全性评估的综合加权物元扩展法

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摘要

This study focuses on a safety evaluation method for underground gas storage. Gas storage is usually constructed underground in complex environments, and the service life of such facilities is limited. To ensure the secure and long-term operation of gas storage facilities, safety evaluation has become the focus of management. The present paper provides an effective method for safety evaluation. An index system was established as the foundation of the analysis for this evaluation, and the matter-element extension method was applied to obtain a quantitative evaluation result. For the weight values of each index in the matter-element extension method, this paper presents a comprehensive weight computation method based on vague sets and entropy. By application of this method, the safety level of a gas storage facility in the Jintan salt mines (in Jiangsu, China) was calculated, and the evaluation result was 4.6433, which meant the safety level was V and the underground gas storage was slightly at risk. It indicated that the influence on the overall safety and tightness of this gas storage could be ignored in the operation process, but the frequency of regular monitoring should be increased. The defective indexes were also obtained, such as salt rock cohesion, the roof thickness, the volume contraction ratio, the interlayer content, the height of the casing shoe and the adjacent cavity pressure difference, which need to be monitored and modified. This paper evaluated the safety of the underground gas storage from a unique perspective. It is expected that the results of this research will contribute to the maintenance and operational decisions, and provide a reference for management in the energy industry.
机译：这项研究集中于地下储气库的安全评估方法。储气库通常在复杂的环境中地下建造，此类设施的使用寿命有限。为了确保储气库的安全和长期运行，安全评估已成为管理的重点。本文提供了一种有效的安全评估方法。建立了指标体系作为本次评价分析的基础，运用物元扩展法获得了定量评价结果。针对物元扩展法中各个指标的权重值，提出了一种基于模糊集和熵的综合权重计算方法。应用该方法计算出金坛盐矿（中国江苏省）储气库的安全等级，评估结果为4.6433，安全等级为V，地下储气库的安全等级为风险。这表明在操作过程中可以忽略对该储气库的整体安全性和密闭性的影响，但应增加定期监测的频率。还获得了不良指标，如盐岩内聚力，顶板厚度，体积收缩率，层间含量，套管鞋的高度和邻近的腔压差，需要对其进行监测和修改。本文从独特的角度评估了地下储气库的安全性。预计这项研究的结果将有助于维护和运营决策，并为能源行业的管理提供参考。

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