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Numerical modeling of hydraulic fracture permeability in viscoelastic rocks
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 17th International Conference on Geoinformatics - Theoretical and Applied Aspects, May 2018, Volume 2018, p.1 - 5
Abstract
Summary
Hydraulic fracturing to exploit hydrocarbons resources has been often used for the last decades. So it is very important to create computer models to simulate these very complex and practically useful phenomena. The new microstructural approach proposed to estimate permeability and to analyze the fluid transfer in porous isotropic nonlinear viscoelastic medium. Numerical Carson and Fast Fourier (FFT) integral transformations for the viscous effects estimation in zone of local stress concentration near grains and pores are used.
The analytical solutions and numerical algorithms for the prediction of viscoelastic creep and relaxation functions are proposed for the case of the multi-media with complex microstructure. Influence of the tri-axial stress state on the local parameters of creep deformations and effective permeability is evaluated. Deformation, permeability and fracture of natural geological materials such as limestone, granite, and soil are very influenced by the presence of micro-defects and porosity, which can cause inelastic effects even in purely hydrostatic load. A network of micro-cracks leads to low strength in the absence of external pressure, significant nonlinear elasticity, and sensitivity to the loading rate. Some examples of numerical modeling are presented. Permeability coefficients and fracture parameters obtained in laboratory experiments are compared with prediction results.
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