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为指导存在偏溶、形状不规则特点的腔体进行天然气阻溶造腔修复作业,开展了相关数值模拟研究。盐穴修复过程中,为保证腔顶安全,仅对目标深度段进行造腔修复,防止腔顶继续拓展,阻溶剂需求量大,因此选择来源便捷的天然气作为阻溶剂。建立数学模型,考虑盐岩上溶特征,编写盐穴储气库天然气阻溶造腔模拟程序,并针对金坛盐穴储气库L井进行天然气阻溶造腔模拟。天然气阻溶造腔可优化单腔形状和体积,提高优质盐层利用率,降低腔体不规则对注气排卤作业的影响风险,保证腔体满足安全要求。研究结果表明:编制的程序可有效模拟天然气阻溶造腔过程中腔体形状的发展,模拟结果与现场工程作业一致,研究成果对提高单个腔体有效体积及腔体稳定性具有重要意义。
In order to guide the existence of partial solubility, irregular shape of the cavity of the gas dissolved cavity repair operations carried out the relevant numerical simulation. Saline hole repair process, in order to ensure the safety of the cavity, only the depth of the target cavity for repair, to prevent the roof to continue to expand, the demand for solvent resistance, so choose a convenient source of natural gas as a solvent. The mathematic model is established, the characteristics of the dissolution of salt rock are considered, the simulation program of natural gas resistance and cavitation for salt cavern gas storage is prepared, and the gas cavity resistance simulation of natural gas is performed for the L well of Jintan salt cavern gas storage. Natural gas resistance cavity making can optimize the shape and volume of single cavity, improve the utilization of high-quality salt layer, reduce the risk of cavity irregularity on gas injection and drainage halogen operation, and ensure the cavity meets the safety requirements. The results show that the programmed program can effectively simulate the cavity shape development during the process of gas-dissolving natural gas. The simulation results are consistent with the field work. The research results are of great significance to improve the effective volume and cavity stability of a single cavity.