Analýza limitních faktorů omezujících navyšování uskladňovacích kapacit podzemních zásobníků plynu.

Abstract

This dissertation thesis deals with factors, which are limiting the increase of storage capacity of underground gas storages. The theoretical part of this thesis is focused on the basic characterization of underground gas storages, on analysis of limiting factors, and on possibilities of increase storage capacities. An important piece of theoretical part is also literature review of cyclic loading in laboratory conditions and of properties of rocks, which are influenced by it. The transition between theoretical and practical part of the thesis represents a description of used apparatuses, design of methodology, and the way of evaluation the gained data. Practical part deals with the influence of cyclic hydrostatic loading on core plugs of Láb and Hořice sandstones. Absolute permeability, pore volume, effective porosity, porosity and permeability stress sensitivity, bulk modulus, Biotˈs coefficient, dissipated energy, volumetric strain and the velocity of longitudinal waves propagation were observed. The results of measurements from all apparatuses are summarized in the well-arranged tables and charts. Granularity and directional orientation of clasts were evaluated from thin sections. This complex description of all measured properties on Coreval 700 apparatus and their subsequent interpretation was performed on a total of 4 core plugs on which the effect of long-term cyclic loading is observable.