Experimental investigation of hydraulic fracture branching

W. F. Li, L. P. Frash, J. W. Carey, M. Meng, H. S. Viswanathan, E. Rougier, Z. Lei, V. T. Chau, T. H. Nguyen, S. Rahimi-Aghdam, Z. P. Bažant

Research output: Contribution to conferencePaperpeer-review

Abstract

Hydraulic-fracturing treatments are an essential part of well completions in unconventional reservoirs. Hydraulic fractures provide access to the low-permeability reservoir rock, but they also interact with natural fractures to create unpredictable complex fracture networks. Recently, the concept of hydraulic fracture branching, as opposed to simple planar fractures, has been predicted by numerical models to be a mechanism for the high production rates observed from unconventional oil and gas wells. Here, we investigated this concept by performing laboratory experiments. These used gypsum plaster in a heterogeneous 2D grid for analog-rock samples to quantitatively analyze hydraulic fracture branching. The grid included a low-permeability matrix and high-permeability 'weak layers' that represent closed natural fractures. Oils with different viscosities were used as the injection fluids to induce hydraulic fracture branching with differing intensity. The experimental results indicate that the intensity of fracture branching can be controlled by the injection parameters. This branching phenomenon was observed by simultaneous growth of the hydraulic fractures in orthogonal/oblique directions, eventually creating a dense network of fractures. Ongoing, we seek a criterion to optimize branching for a given rock type using measurable parameters and tailored stimulation fluids.

Original languageEnglish (US)
StatePublished - 2020
Event54th U.S. Rock Mechanics/Geomechanics Symposium - Virtual, Online
Duration: Jun 28 2020Jul 1 2020

Conference

Conference54th U.S. Rock Mechanics/Geomechanics Symposium
CityVirtual, Online
Period6/28/207/1/20

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Geotechnical Engineering and Engineering Geology

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