Method for repairing flat top of salt-cavern gas storage cavity

The invention provides a method for repairing the flat top of a salt cavern gas storage cavity, which comprises the following steps of: acquiring the form data of the cavity top, carrying out mechanical calculation, and evaluating the stability of the existing salt cavern cavity top plate in the gas injection, brine discharge and injection-production operation process; the length of the sleeve needing to be cut is determined, and then the sleeve is cut; the concentric double-tube cavity is tripped into the production sleeve to repair the dissolving cavity tubular column, the dissolution inhibitor is injected from an annular space between the production sleeve and the dissolving cavity outer tube, and the dissolving cavity is injected with water to repair the top of the cavity. According to the method, the flat top of the salt-cavern gas storage cavity can be subjected to corrosion repair, and a dome structure with stable mechanics is formed; through the method, the distance between the casing shoe and the top