期刊
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
卷 35, 期 -, 页码 761-774出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2016.09.018
关键词
Hydraulic fracture; Heterogeneous material; FEM; ABAQUS
资金
- National Natural Science Foundation of China [51474048]
This paper presents a hydraulic fracture model based on a fully coupled, pore pressure-effective stress formulation. The stress-strain behavior of the solid phase is modeled using an elasto-plastic, Mohr Coulomb description. Hydraulic conductivity is related to the difference between mean effective stress and tensile strength via a hyperbolic tangent function that takes into account the relative permeability using the Corey correlation. The effect of the damage coefficient E on fracture propagation is studied via the hyperbolic function and the sensitivity of the solution to the aspect ratio of the elements is checked. Three types of material distributions are considered: homogeneous domain in which the material properties are constant; heterogeneous domain where multi-layered materials with strong and weak layers are included; and multi-layered material in which the values of the material properties for each layer are randomly generated using a PYTHON script. The propagation mechanisms and fracture features are discussed. Finally the propagation process, the extent of the fracture zone and pore pressure changes from a series of numerical simulations using ABAQUS are presented. (C) 2016 Elsevier B.V. All rights reserved.
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