Patent ID: 11927131
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 6:
7. A method for subterranean energy storage, the method comprising:
cooling a hot compressed gas stream via a heat exchanger to form a cooled compressed gas stream;
supplying the cooled compressed gas stream to a subterranean flexible storage vessel that is at least partially surrounded by sand, wherein the subterranean flexible storage vessel is coupled to a turbine generator;
supplying a heated coolant stream from an insulated storage vessel to a turbine generator, wherein the heated coolant stream is a product of the heat exchanger removing heat from a hot compressed gas stream to render the cooled compressed gas stream; and
heating the cooled compressed gas stream within the subterranean flexible storage vessel via conduction with the sand, wherein the heating pressurizes the subterranean flexible storage vessel.