Experiments on salt crystallization of brine discharge pipe string in deep salt cavern gas storage and its field application
Gas injection and brine discharge is a key link to the construction and safe operation of salt cavern gas storage.A deep salt cavern gas storage under construction in China is faced with the risk of pipe blocking of salt crystallization during gas injection and brine discharge due to its deep burial depth and high formation temperature.To improve the efficiency of brine discharge and ensure the smooth progress of gas injection and brine discharge,based on the geological characteristics of a deep salt cavern gas storage,a crystallization experimental device for gas injection and brine discharge in salt cavern is designed.Laboratory experiments were conducted to study the problem of salt crystallization pipe blocking during the process of gas injection and brine discharge in deep salt cavern gas storage.The induction period of salt crystallization and the laws of salt crystallization in brine discharge pipe string were obtained,and combined with the gas injection and brine discharge engineering practice of deep salt cavern gas storage,suggestions for preventing the salt crystallization pipe blocking of deep brine discharge pipe string were put forward.The reserch results provide theoretical support and practical reference for the design and construction of gas injection and brine dicharge for deep salt cavern gas storage.
deep salt cavern gas storagegas injection and brine dischargepipe blocking of salt crystallizationfield application
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