A numerical investigation of hydraulic fracturing process in oil reservoirs using non-linear fracture mechanics

V. Bahrami, A. Mortazavi

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

5 Citations (Scopus)

Abstract

Several methods are proposed for simulation of hydraulic fracturing process in rock material. In most of this models it is assumed that the rock mass is a linear elastic solid and the criterion of fracture propagation is mostly expressed by the conventional stress intensity factor calculation approach of linear elastic fracture mechanics (LEFM). In the analysis of fracturing processes, LEFM theory is valid until the non-linear behavior of the material, in particular at the crack tip, does not affect the propagation of the crack. In this paper, considering the effect of the plastic behavior of rock on the hydraulic fracturing process, the non-linear fracture mechanics concepts (J-integral) were applied to the analysis of hydraulic fracture propagation. The J-integral was related to the energy released associated with crack growth and was used as a measure of intensity of deformation at the crack tip for both linear and non-linear materials. The finite element code, ABAQUS, was used to simulate the hydraulic fracturing process. A typical 2-D section of a cylindrical oil reservoir was considered in the analysis. Assuming a plane strain condition, the energy release rate was calculated based on J-integral in an arbitrary path around the crack tip and the propagation of crack was analyzed. The results obtained from numerical modeling were compared against theoretical solution successfully. In the next phase, considering a Mohr-Coulomb material model for the rock, the effects of plastic deformation at crack tip on the fracturing process was investigated. Using this plastic material model, the obtained results were compared against the results obtained from conventional elastic analysis used in common and the effects of crack tip plastic deformations on the fracturing were demonstrated.

Original languageEnglish
Title of host publicationISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008
EditorsAbbas Mahdi, Abdolhadi Ghazvinian
PublisherInternational Society for Rock Mechanics
Pages991-998
Number of pages8
ISBN (Print)9781617823527
Publication statusPublished - Jan 1 2008
Externally publishedYes
Event5th Asian Rock Mechanics Symposium 2008, ARMS 2008 - Tehran, Iran, Islamic Republic of
Duration: Nov 24 2008Nov 26 2008

Publication series

NameISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008

Conference

Conference5th Asian Rock Mechanics Symposium 2008, ARMS 2008
CountryIran, Islamic Republic of
CityTehran
Period11/24/0811/26/08

Fingerprint

Hydraulic fracturing
fracture mechanics
fracturing
Fracture mechanics
Crack tips
hydraulics
crack tips
Oils
crack
oils
J integral
Rocks
oil
Crack propagation
rocks
propagation
cracks
Plastic deformation
fracture propagation
plastic deformation

Keywords

  • Fracture Mechanics
  • Hydraulic Fracturing
  • J-Integral
  • Numerical Simulation
  • Oil Reservoir

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Bahrami, V., & Mortazavi, A. (2008). A numerical investigation of hydraulic fracturing process in oil reservoirs using non-linear fracture mechanics. In A. Mahdi, & A. Ghazvinian (Eds.), ISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008 (pp. 991-998). (ISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008). International Society for Rock Mechanics.

A numerical investigation of hydraulic fracturing process in oil reservoirs using non-linear fracture mechanics. / Bahrami, V.; Mortazavi, A.

ISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008. ed. / Abbas Mahdi; Abdolhadi Ghazvinian. International Society for Rock Mechanics, 2008. p. 991-998 (ISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008).

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

Bahrami, V & Mortazavi, A 2008, A numerical investigation of hydraulic fracturing process in oil reservoirs using non-linear fracture mechanics. in A Mahdi & A Ghazvinian (eds), ISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008. ISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008, International Society for Rock Mechanics, pp. 991-998, 5th Asian Rock Mechanics Symposium 2008, ARMS 2008, Tehran, Iran, Islamic Republic of, 11/24/08.
Bahrami V, Mortazavi A. A numerical investigation of hydraulic fracturing process in oil reservoirs using non-linear fracture mechanics. In Mahdi A, Ghazvinian A, editors, ISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008. International Society for Rock Mechanics. 2008. p. 991-998. (ISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008).
Bahrami, V. ; Mortazavi, A. / A numerical investigation of hydraulic fracturing process in oil reservoirs using non-linear fracture mechanics. ISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008. editor / Abbas Mahdi ; Abdolhadi Ghazvinian. International Society for Rock Mechanics, 2008. pp. 991-998 (ISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008).
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