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 language||English (US)|
|Number of pages||8|
|State||Published - 1986|
|Event||International Society for Rock Mechanics and Rock Engineering International Symposium, ISRM IS 1986 - Stockholm, Sweden|
Duration: Aug 31 1986 → Sep 3 1986
|Other||International Society for Rock Mechanics and Rock Engineering International Symposium, ISRM IS 1986|
|Period||8/31/86 → 9/3/86|
Bibliographical notePublisher Copyright:
© 1986 International Society for Rock Mechanics. All rights reserved.