METHOD FOR CREATING AND OPERATING AN UNDERGROUND GAS STORAGE FACILITY IN AN AQUIFEROUS GEOLOGICAL STRUCTURE Russian patent published in 2022 - IPC B65G5/00 

FIELD: gas storage.

SUBSTANCE: invention relates to the field of gas storage, for example, hydrocarbon, including natural, or non-hydrocarbon, in aquiferous geological structures and, in particular, to methods for controlling the movement of the displacement front formed by gas displacing reservoir water in the geological structure during the creation and operation of underground gas storage. The method is characterized by the fact that injection wells are drilled in the dome area of the aquifer geological structure selected for underground gas storage. Gas injection is carried out based on the condition that its front reaches, ensuring the displacement of reservoir water, hypsometric marks corresponding to the design volume of the gas storage. The zone of active movement of the gas front during the operation of the storage is predicted. There are areas with increased filtration and capacitance properties, FCP. In the zone of active movement of the gas front, taking into account the allocated areas from the FCP, drilling of technological wells is provided. At the stage of gas injection, at least primary, process wells are used for the extraction and bypass of the displaced reservoir water. At the stage of cyclic operation of the gas storage, process wells are used to create a screen for marginal reservoir water with its optimal horizontal transverse width, determined from the analytical expression. Adjacent process wells are placed at a predetermined distance from each other, affecting the permeability of the screen. The screen is considered weakly permeable. To form a screen, an aqueous solution of foaming surfactants and gas is used with their ratio of 1:1÷3.9, respectively, the latter of which is selected with properties similar in their physico-chemical properties to the gas to be stored.

EFFECT: increase in the efficiency of the method by reducing gas losses, increasing its active volume, extending the period of anhydrous operation of the UGS at increased gas extraction rates.

5 cl, 6 dwg, 3 tbl