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Investigation of hydraulic fracture propagation using a post-peak control system coupled with acoustic emission

journal contribution
posted on 2015-05-01, 00:00 authored by L-H Chen, W-C Chen, Y-C Chen, L Benyamin, An-Jui Li
This study investigates the fracture mechanism of fluid coupled with a solid resulting from hydraulic fracture. A new loading machine was designed to improve upon conventional laboratory hydraulic fracture testing and to provide a means of better understanding fracture behavior of solid media. Test specimens were made of cement mortar. An extensometer and acoustic emission (AE) monitoring system recorded the circumferential deformation and crack growth location/number during the test. To control the crack growth at the post-peak stage the input fluid rate can be adjusted automatically according to feedback from the extensometer. The complete stress-deformation curve, including pre- and post-peak stages, was therefore obtained. The crack extension/growth developed intensively after the applied stress reached the breakdown pressure. The number of cracks recorded by the AE monitoring system was in good agreement with the amount of deformation (expansion) recorded by the extensometer. The results obtained in this paper provide a better understanding of the hydraulic fracture mechanism which is useful for underground injection projects. © 2014 Springer-Verlag Wien.

History

Journal

Rock mechanics and rock engineering

Volume

48

Issue

3

Pagination

1233 - 1248

Publisher

Springer

Location

Berlin, Germany

ISSN

0723-2632

eISSN

1434-453X

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2015, Springer