Stress conditions for initiation of secondary fractures from a fractured borehole

E. Detournay, R. G. Jeffrey

Research output: Contribution to conferencePaperpeer-review

6 Scopus citations

Abstract

A two-dimensional elastic analysis is made of conditions for initiating, by pressurizing a jacketed borehole, secondary fractures that extend perpendicuI ar to the maximum in-situ stress, The problem is uncoupled i nto two parts, first, the tangential stress is calculated at the points of initiation of the secondary fractures as a function of borehole pressure, far-field stress, and length of the prima ry fractures, and second, the stable length of the primary fractures is calculated using I inear elastic fracture mechanics This analysis leads to a simple method for determining ω1 provided that ω2 and the primary and secondary breakdown pressures are known, ana does not require determination of the tensi le strength of the rock.

Original languageEnglish (US)
Pages281-288
Number of pages8
StatePublished - 1986
Externally publishedYes
EventInternational Society for Rock Mechanics and Rock Engineering International Symposium, ISRM IS 1986 - Stockholm, Sweden
Duration: Aug 31 1986Sep 3 1986

Other

OtherInternational Society for Rock Mechanics and Rock Engineering International Symposium, ISRM IS 1986
Country/TerritorySweden
CityStockholm
Period8/31/869/3/86

Bibliographical note

Publisher Copyright:
© 1986 International Society for Rock Mechanics. All rights reserved.

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