Laboratory investigation of hydraulic fracture behavior of unconventional reservoir rocks

Maria Bobrova, Sergey Stanchits, Anna Shevtsova, Egor Filev, Vladimir Stukachev, Tagir Shayahmetov

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The heterogeneity of the rock fabric is a significant factor influencing the initiation and propagation of a hydraulic fracture (HF). This paper presents a laboratory study of HF created in six shale‐like core samples provided by RITEK LLC collected from the same well, but at different depths. For each tested sample, we determined the breakdown pressure, the HF growth rate, and the expansion of the sample at the moment when the HF reaches the sample surface. Correlations were established between the HF parameters and the geomechanical characteristics of the studied samples, and deviations from the general relationships were explained by the influence of the rock matrix. The analysis of the moment tensor inversion of radiated acoustic emission (AE) signals allows us to separate AE signals with a dominant shear component from the signals with a significant tensile component. The direction of microcrack opening was determined, which is in good agreement with the results of the post‐test X‐ray CT analysis of the created HF. Thus, it has been shown that a combination of several independent laboratory techniques allows one to reliably determine the parameters that can be used for verification of hydraulic fracturing models.

Original languageEnglish
Article number292
JournalGeosciences (Switzerland)
Volume11
Issue number7
DOIs
Publication statusPublished - Jul 2021

Keywords

  • Acoustic emission
  • Fracture initiation
  • Fracture propagation
  • Hydraulic fracturing
  • Moment tensor
  • Source mechanism

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