The breakdown pressure - the peak pressure that is reached during pressurization of the wellbore - is interpreted in this paper to correspond to a condition of unstable crack propagation. It is shown that the classical Hubbert and Willis14 and Haimson and Fairhurst9 breakdown criteria represent a condition of fracture initiation in the limiting case of fast and slow pressurization rate, respectively; and that the breakdown pressure, pb, could be either equal to or larger than the fracture-initiation pressure, pi.
|Original language||English (US)|
|Number of pages||5|
|Journal||SPE Production and Facilities|
|State||Published - Aug 1997|
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