MODELLING AND ESTIMATING ACTIVE STORAGE CAPACITY OF UNDERGROUND GAS STORAGE IN WATER-BEARING FRACTURED POROUS STRUCTURES Russian patent published in 2015 - IPC E21B49/00 G01N15/08 

FIELD: oil and gas industry.

SUBSTANCE: invention may be used for modelling and designing of underground gas storage in water-bearing reservoir beds and estimating active storage capacity. The method includes sampling of representative rock samples with values of porosity and impermeability typical for the underground gas storage, forming reservoir bed simulator by sequential placement of the representative rock samples in a core holder, connecting precision pumps for water and gas injection to input of the reservoir bed simulator, filling the reservoir bed simulator with water and gas in volumes corresponding to initial values of gas and water saturation of the underground gas storage, defining open pore volume of the reservoir bed simulator on volume basis of water and gas injected to the reservoir bed simulator, setting reservoir temperature, generating ground pressure and reservoir pressure corresponding to values of ground pressure and reservoir pressure in the underground gas storage, and closing output of the reservoir bed simulator by precision pump thus reaching maximum reservoir pressure for the underground gas storage, simulating gas withdrawal by gas release from input of reservoir bed simulator thus reaching minimum reservoir pressure for the underground gas storage and recording volume of released water and gas, determining active storage capacity in the reservoir bed simulator against difference in gas and water volume released from it with subsequent determining active storage capacity for the underground gas storage, which is defined as production of open pore volume of the underground gas storage by quotient of active storage capacity in the reservoir bed simulator by open pore volume of the reservoir bed simulator.

EFFECT: modelling and estimating active storage capacity of underground gas storage in water-bearing fractured porous structures that reflects behaviour of natural reservoir bed adequately for the designed underground gas storage.

8 cl, 3 dwg