A water curtain system is widely adopted in the underground storage of gas/oil in unlined rock caverns to maintain a stable groundwater level and ensure a good water sealing condition for the storage facility. Hydrogeological tests were conventionally carried out in practice to assess the hydraulic conductivity of the surrounding rocks and evaluate the performance of the water curtain system. Among them, the hydraulic connectivity between adjacent boreholes is assessed using interconnectivity test, and it is commonly thought that, if the measured connectivity between two neighboring boreholes is low, a new borehole has to be added in the middle of them to improve the local efficiency of water curtain system. This paper reexamines the viewpoint of using interconnectivity test to determine the necessity of adding borehole. To this end, the conditions of water sealing were firstly discussed and the deficiency of existing water-sealing criterion was presented, with a new rigorous criterion proposed. The equivalent porous medium (EPM) flow model and fractured porous medium (FPM) flow model, two representative models for groundwater flow analysis, were then used to investigate the influences of borehole spacing and stored gas pressure on seepage field. These numerical results were employed to validate the proposed water-sealing criterion and suggested that, in terms of forming a stable water covering layer, the addition of borehole based on interconnectivity test is unnecessary and should be canceled for saving time and reducing cost.

中文翻译：

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加深对水封判据的认识重新审视加设水幕钻孔的必要性

水幕系统广泛应用于无衬砌岩洞气/油的地下储存，以保持地下水位稳定，保证储存设施良好的水封条件。水文地质试验通常在实践中进行，以评估围岩的水力传导率并评估水幕系统的性能。其中，相邻钻孔之间的水力连通性是通过连通性测试来评估的，通常认为，如果测得的相邻两个钻孔之间的连通性较低，则必须在它们中间增加一个新钻孔以提高局部效率。水幕系统。本文重新审视了用连通性测试来确定增孔必要性的观点。为此，首先讨论了水封条件，指出了现有水封准则的不足，提出了新的严格准则。然后，利用等效多孔介质 (EPM) 流模型和裂缝性多孔介质 (FPM) 流模型这两种具有代表性的地下水流分析模型，研究了钻孔间距和储气压力对渗流场的影响。这些数值结果用于验证所提出的水封准则，并提出，在形成稳定的水覆盖层方面，基于连通性测试的钻孔是不必要的，应该取消，以节省时间和降低成本。然后，利用等效多孔介质 (EPM) 流模型和裂缝性多孔介质 (FPM) 流模型这两种具有代表性的地下水流分析模型，研究了钻孔间距和储气压力对渗流场的影响。这些数值结果用于验证所提出的水封准则，并提出，在形成稳定的水覆盖层方面，基于连通性测试的钻孔是不必要的，应该取消，以节省时间和降低成本。然后，利用等效多孔介质 (EPM) 流模型和裂缝性多孔介质 (FPM) 流模型这两种具有代表性的地下水流分析模型，研究了钻孔间距和储气压力对渗流场的影响。这些数值结果用于验证所提出的水封准则，并提出，在形成稳定的水覆盖层方面，基于连通性测试的钻孔是不必要的，应该取消，以节省时间和降低成本。