Acoustic emission monitoring of heterogeneous rock hydraulic fracturing

S. Stanchits, J. Burghardt, A. Surdi, E. Edelman, R. Suarez-Rivera

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Citations (Scopus)

Abstract

In this paper, the results of laboratory studies of hydraulic fracture in homogeneous sandstone blocks with man- made interfaces and heterogeneous shale blocks with weak natural interfaces are reported. Tests were conducted under similar stress conditions, with fluids of different viscosity and at different injection rates. The measurements and analysis allows the identification of fracture initiation and behavior. Fracturing with high viscosity fluids resulted in stable fracture propagation initiated before breakdown, while fracturing with low viscosity fluids resulted in unstable fracture propagation initiated almost simultaneously with breakdown. Analysis also allows us to measure the fluid volume entering the fracture and the fracture volume. Monitoring of Acoustic Emission (AE) hypocenter localizations, indicates the development of created fractured area including the intersection with interfaces, fluid propagation along interfaces, crossing interfaces, and approaching the boundaries of the block. We observe strong differences in hydraulic fracture behavior, fracture geometry and fracture propagation speed, when fracturing with water and high viscosity fluids. We also observed distinct differences between sandstone blocks and shale blocks, when a certain P-wave velocity ray path is intersected by the hydraulic fracture. The velocity increases in sandstones and decreases in shale.

Original languageEnglish
Title of host publication48th US Rock Mechanics / Geomechanics Symposium 2014
EditorsRay Sterling, Emmanuel Detournay, Will Pettitt, Joseph F. Labuz, Lee Petersen
PublisherAmerican Rock Mechanics Association (ARMA)
Pages110-120
Number of pages11
ISBN (Electronic)9781634395236
Publication statusPublished - 2014
Externally publishedYes
Event48th US Rock Mechanics / Geomechanics Symposium 2014: Rock Mechanics Across Length and Time Scales - Minneapolis, United States
Duration: 1 Jun 20144 Jun 2014

Publication series

Name48th US Rock Mechanics / Geomechanics Symposium 2014
Volume1

Conference

Conference48th US Rock Mechanics / Geomechanics Symposium 2014: Rock Mechanics Across Length and Time Scales
Country/TerritoryUnited States
CityMinneapolis
Period1/06/144/06/14

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