Features of the Formation of a Gas-Saturated Area During the Creation of an Underground Gas Storage in a Depleted Gas Reservoir in a Fractured-Pore Type Reservoir with an Active Aquifer

Abstract

Underground gas storages are an important component of reliable year-round operation of the country’s gas transportation system. The task of increasing the storage capacity is relevant both for newly created underground gas storages and for existing ones. The expansion of underground gas storage is a procedure for the sequential increase of gas volumes in the reservoir. It requires considerable time and in homogeneous formations can reach from eight to ten cycles of gas injection and production. During this period, the technological indicators of the development are stabilized, a stable transition zone is formed along the gas-water contact, and the active and buffer volumes of gas are stabilized. The main aim is in investigation of the influence of various factors on the formation of the transition zone within the gas-water contact during the creation and operation of underground gas storage in the elastic-water-pressure regime in fracture-pored reservoirs. Paper was based by Hydrodynamic computer 3D modelling. The nature of the influence of the following parameters on the volume of gas pushed into the aquifer region has been established: the angle of incidence of the formation, the values of minimum and maximum pressures in the gas-saturated part during the operation of the underground gas storage, the permeability of the matrix (intergranular) and fractures permeability.

Keywords

• hydrodynamic modeling
• fractured-pore collector
• underground gas storage
• trapped gas