Discrete element modelling of hydraulic fracture interaction with natural fractures in shale formations


YILDIRIM B., Cao W., Shi J., Durucan S., Korre A.

2nd International Discrete Fracture Network Engineering Conference, DFNE 2018, Washington, United States Of America, 20 - 22 June 2018 identifier

  • Publication Type: Conference Paper / Full Text
  • City: Washington
  • Country: United States Of America
  • Middle East Technical University Affiliated: Yes

Abstract

Research presented in this paper aimed at establishing a better understanding of natural fracture (NF)/hydraulic fracture (HF) interaction mechanisms and fracture network development in naturally fractured and nonhomogeneous shale formations through numerical modelling using the two-dimensional particle flow code (PFC2D). Hydraulic fracture propagation was firstly modelled in a 30 m x 30 m model representing intact rock by bonded particle method (BPM), which served as a base case in the research. Then a single, deterministic natural fracture was embedded into the same model by a smooth joint contact model (SJM) to investigate different NF/HF interaction mechanisms under a range of different conditions by varying the angle of approach, differential horizontal stress, and the mechanical properties of a fracture within the model. Based on the parametric research findings, number and diversity of natural fractures in the model were increased both deterministically and stochastically, and the results are compared and discussed.