A cohesive model for modeling hydraulic fractures in naturally fractured formations

M. Gonzalez, A. Dahi Taleghani, J. E. Olson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

26 Scopus citations

Abstract

A cohesive zone model (CZM) has been developed to couple fluid flow with elastic, plastic and damage behavior of rock during hydraulic fracturing in naturally fractured formations. In addition to inelastic deformations, this model incorporates rock anisotropics. Fracture mechanics of microcrack and micro-void nucleation and their coalescence are incorporated into the formulation of the CZM models to accurately capture different failure modes of rocks. The performance of the developed elastoplastic and CZM models are compared with the available data of a shale play, and then the models are introduced into a commercial finite element package through user-defined subroutines. A workflow to derive the required model parameters for both intact rock and cemented natural fractures is presented through inverse modeling of field data. The hydraulic fractures' growth in the reservoir scale is then simulated, in which the effect of fluid viscosity, natural fracture characteristics and differential stresses on induced fracture network is studied. The simulation results are compared with the available solutions in the literature. The developed CZM 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.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - SPE Hydraulic Fracturing Technology Conference 2015
PublisherSociety of Petroleum Engineers
Pages858-873
Number of pages16
ISBN (Electronic)9781510800274
StatePublished - Jan 1 2015
EventSPE Hydraulic Fracturing Technology Conference 2015 - The Woodlands, United States
Duration: Feb 3 2015Feb 5 2015

Publication series

NameSociety of Petroleum Engineers - SPE Hydraulic Fracturing Technology Conference 2015

Other

OtherSPE Hydraulic Fracturing Technology Conference 2015
CountryUnited States
CityThe Woodlands
Period2/3/152/5/15

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

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  • Cite this

    Gonzalez, M., Dahi Taleghani, A., & Olson, J. E. (2015). A cohesive model for modeling hydraulic fractures in naturally fractured formations. In Society of Petroleum Engineers - SPE Hydraulic Fracturing Technology Conference 2015 (pp. 858-873). (Society of Petroleum Engineers - SPE Hydraulic Fracturing Technology Conference 2015). Society of Petroleum Engineers.