The brittleness index in hydraulic fracturing

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Title: The brittleness index in hydraulic fracturing
Authors: Papanastsiou, P
Atkinson, C
Item Type: Conference Paper
Abstract: We present a new definition of a brittleness index which is used as a criterion for candidate selection of rock intervals for hydraulic fracturing. The new index is a combination of material strength parameters and insitu stresses. It was derived from an analytical model of hydraulic fracturing in weak formations of varying ductility. The model is based on Mohr-Coulomb dislocations that are placed in the effective centres of the complete slip process that is distributed around the crack tip. The new brittleness index varies between 0 and 1 with the one limit to correspond to brittle propagation and the other limit to a fracture that requires infinite energy release per unit advance. The values between 0 and 1 correspond to fracture propagation of increasing ductility from brittle to small scale and finally to large scale yielding. The results are particularly interesting for predicting the propagation of axial fractures in the horizontal direction and their confinement in the vertical direction.
Issue Date: 1-Jul-2015
Date of Acceptance: 8-May-2015
Publisher: ARMA
Journal / Book Title: ARMA 15
Copyright Statement: Copyright 2015 ARMA, American Rock Mechanics Association. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of ARMA is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 200 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgement of where and by whom the paper was presented.
Conference Name: 49th US Rock Mechanics / Geomechanics Symposium
Publication Status: Published
Start Date: 2015-06-28
Finish Date: 2015-07-01
Conference Place: San Francisco, California, USA
Appears in Collections:Mathematics
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences

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