What can we learn from ultrasonic velocities monitoring during hydraulic fracturing of a tight shale

Jérôme Fortin, Sergey Stanchits

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

2 Citations (Scopus)

Abstract

Methods allowing to estimate the size and aperture of induced hydraulic fracture are essential for a proper design of unconventional reservoir well stimulation. In this paper, we focus on ultrasonic velocities monitoring during hydraulic fracturing of a tight shale. We report experimental results, where a sample was first loaded in a polyaxial loading frame and then fractured by injection of a viscous fluid at a constant flow. During the experiment, P-wave velocities were periodically measured in different directions. Our results show that ultrasonic measurements can be useful for understanding the mechanics of the hydraulic fracture growth. More precisely, from the evolution of the P-velocities and their amplitudes during the loading, we are able: (i) to estimate the velocity of the hydraulic fracture growth; (ii) to show that propagation of a liquid-free crack always precedes the liquid front; (iii) to estimate the aperture of the hydraulic fracture. These results show that ultrasonic velocities monitoring can yield direct measurements of fracture width, length and dynamics of propagation. These inferred properties of the hydraulic fracture can also provide verification of the results of various theoretical models describing fracture propagation.

Original languageEnglish
Title of host publication49th US Rock Mechanics / Geomechanics Symposium 2015
PublisherAmerican Rock Mechanics Association (ARMA)
Pages2414-2418
Number of pages5
ISBN (Electronic)9781510810518
Publication statusPublished - 2015
Externally publishedYes
Event49th US Rock Mechanics / Geomechanics Symposium - San Francisco, United States
Duration: 29 Jun 20151 Jul 2015

Publication series

Name49th US Rock Mechanics / Geomechanics Symposium 2015
Volume4

Conference

Conference49th US Rock Mechanics / Geomechanics Symposium
Country/TerritoryUnited States
CitySan Francisco
Period29/06/151/07/15

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