A method of pad gas management in an underground storage volume including storing a first compressible fluid, determining a transient minimum operating pressure (P.sub.trans), measuring the pressure (P.sub.act), removing at least a portion of the first compressible fluid, concurrently, introducing an incompressible fluid, thereby producing a transient pressure condition controlled by the flow rate of the incompressible fluid, such that P.sub.trans<P.sub.act. The method may also include a length of casing, permanently cemented into the surrounding rock formations, with a final cemented casing shoe defining the practical endpoint at an approximate depth (D.sub.casing), determining a transient pressure gradient (G.sub.trans) for the underground storage volume, wherein P.sub.trans<D.sub.casingG.sub.trans. The maximum removal of the first compressible fluid is controlled such that P.sub.min<P.sub.act, and wherein the transient pressure condition has a duration (D) of less than 7 days, more preferably less than 5 days.

The present invention provides a foot frame bottom plate type fixed part, a sealed inner lining structure, an underground chamber, belonging to the field of compressed air energy storage technology. The skeleton includes a fixed bottom plate and an umbrella shaped tripod, which is equipped with a connecting part and an umbrella shaped part. The umbrella shaped part is set at the top of the connecting part. The umbrella shaped tripod is fixedly connected to the fixed bottom plate in the length direction, forming a semi open containment space clamp. The sealing inner lining structure includes an airtight layer and a foot rest bottom plate shaped fixed part. The underground chamber includes a concrete lining layer and a sealed lining structure. Its construction period is shorter than that of welded steel plates, and the cost is lower.

The present disclosure is directed toward a system and a method for storing gas. The system for storing gas comprises a salt formation, an overburden, an underburden, a salt cavern within the salt formation, a sorbent within the salt cavern, and a well traversing the surface that connects the surface with the salt cavern. The method for storing gas comprises several steps. A dissolving fluid comprising water is injected into a salt formation to produce a brine and a salt cavern within the salt formation. The brine is then removed from the salt cavern. A sorbent is then placed within the salt cavern before gas is injected into the salt cavern.

The present disclosure is directed toward a method for storing carbon dioxide. The method for storing carbon dioxide comprises several steps. A dissolving fluid comprising water is injected into a salt formation to produce a brine and a salt cavern within the salt formation. The brine is then removed from the salt cavern. A sorbent is then placed within the salt cavern before carbon dioxide is injected into the salt cavern.

The present disclosure is directed toward a method for storing methane. The method for storing methane comprises several steps. A dissolving fluid comprising water is injected into a salt formation to produce a brine and a salt cavern within the salt formation. The brine is then removed from the salt cavern. A sorbent is then placed within the salt cavern before methane is injected into the salt cavern.