Method for detecting gas-storing performance of solution-mined salt cavern in high-insoluble salt mine

A method for detecting gas-storing performance of solution-mined salt cavern in a high-insoluble salt mine, comprising:

• detecting water-tightness of a cavern and water-tightness of a wellbore;
• under the condition that the water-tightness of the cavern and the water-tightness of the wellbore meet a detection standard for water-tightness, arranging a gas sealing tubing in a production casing for the wellbore, and arranging a packer;
• detecting gas-tightness of the wellbore;
• under the condition that the gas-tightness of the wellbore meets a detection standard for gas-tightness, injecting test gas into the cavern through the gas sealing tubing at a gas-injection well, so that brine in the cavern is discharged through the gas sealing tubing at a debrining well;
• when the test gas starts to be discharged from the debrining well, calculating a volume of the brine discharged;
• closing the debrining well, and then injecting the test gas into the cavern through the gas sealing tubing at the gas-injection well;
• after a pressure value above a gas-liquid interface in the cavern reaches a set pressure value, closing the gas-injection well;
• and
• detecting gas-tightness of the cavern.