A continuum damage failure model for hydraulic fracturing of porous rocks

Amir Shojaei, Arash Dahi Taleghani, Guoqiang Li

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

A continuum damage mechanics (CDM) based constitutive model has been developed to describe elastic, plastic and damage behavior of porous rocks. The pressure sensitive inelastic deformation of porous rocks together with their damage mechanisms are studied for drained and undrained conditions. Fracture mechanics of microcrack and micro-void nucleation and their coalescence are incorporated into the formulation of the CDM models to accurately capture different failure modes of rocks. A fracture mechanics based failure criterion is also incorporated to accurately capture the post fracture crack advances in the case of progressive failures. The performance of the developed elastoplastic and CDM models are compared with the available experimental data and then the models are introduced into a commercial software package through user-defined subroutines. The hydraulic fractures growth in a reservoir rock is then investigated; in which the effect of injection pressure is studied and the simulations are compared with the available solutions in the literature. The developed CDM model outperforms the traditional fracture mechanics approaches by removing stress singularities at the fracture tips and simulation of progressive fractures without any essential need for remeshing. This model would provide a robust tool for modeling hydraulic fracture growth using conventional elements of FEA with a computational cost less than similar computational techniques like cohesive element methods.

Original languageEnglish (US)
Pages (from-to)199-212
Number of pages14
JournalInternational journal of plasticity
Volume59
DOIs
StatePublished - Jan 1 2014

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Hydraulic fracturing
Continuum damage mechanics
Rocks
Fracture mechanics
Hydraulics
Subroutines
Microcracks
Constitutive models
Coalescence
Software packages
Failure modes
Nucleation
Plastics
Cracks
Finite element method
Costs

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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A continuum damage failure model for hydraulic fracturing of porous rocks. / Shojaei, Amir; Dahi Taleghani, Arash; Li, Guoqiang.

In: International journal of plasticity, Vol. 59, 01.01.2014, p. 199-212.

Research output: Contribution to journalArticle

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