Importance

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Abstract

A method of pad gas management in an underground storage volume including storing a first compressible fluid, determining a transient minimum operating pressure (P_trans), measuring the pressure (P_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_transact. 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_casing), determining a transient pressure gradient (G_trans) for the underground storage volume, wherein P_transcasing×G_trans. The maximum removal of the first compressible fluid is controlled such that P_minact, and wherein the transient pressure condition has a duration (D) of less than 7 days, more preferably less than 5 days.

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First Claim