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The Effect of Crack Closure on Permeability and Dynamic Elastic Moduli of Sandstone
The interaction between mechanical deformation, pore fluid pressure, temperature and fluid flow determines the thermo-hydro-mechanical behavior of a geothermal reservoir rock. Both elastic and transport properties of a rock such as Flechtinger sandstone are controlled to a large extent by porosity. The poroelasticity theory and crack closure theory were employed to estimate the porosity change at drained conditions. Hydrostatic compression tests and steady state fluid flow tests were carried out. Permeability measurements were carried out while cycling confining pressure at a constant downstream pressure of 1 MPa. Meanwhile the temperature was increased stepwise from 28 °C to 140 °C. While the volumetric change of the crack-like cavities is not significant, they control the fluid flow pathways and, consequently, the permeability of the rock. The new permeability model correlates the microstructure of porosity, volumetric strain and permeability. The permeability dropped sharply until a characteristic pressure and was leveled off afterwards.
The Effect of Crack Closure on Permeability and Dynamic Elastic Moduli of Sandstone
The interaction between mechanical deformation, pore fluid pressure, temperature and fluid flow determines the thermo-hydro-mechanical behavior of a geothermal reservoir rock. Both elastic and transport properties of a rock such as Flechtinger sandstone are controlled to a large extent by porosity. The poroelasticity theory and crack closure theory were employed to estimate the porosity change at drained conditions. Hydrostatic compression tests and steady state fluid flow tests were carried out. Permeability measurements were carried out while cycling confining pressure at a constant downstream pressure of 1 MPa. Meanwhile the temperature was increased stepwise from 28 °C to 140 °C. While the volumetric change of the crack-like cavities is not significant, they control the fluid flow pathways and, consequently, the permeability of the rock. The new permeability model correlates the microstructure of porosity, volumetric strain and permeability. The permeability dropped sharply until a characteristic pressure and was leveled off afterwards.
The Effect of Crack Closure on Permeability and Dynamic Elastic Moduli of Sandstone
Hassanzadegan, Alireza (author) / Milsch, Harald (author) / Blöcher, Guido (author) / Zimmermann, Günter (author)
Fifth Biot Conference on Poromechanics ; 2013 ; Vienna, Austria
Poromechanics V ; 1435-1443
2013-06-18
Conference paper
Electronic Resource
English
Wave propagation , Permeability , Poroelasticity , Mechanics , Cracking , Simulation , Porous media , Sandstone , Porosity , Elasticity
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