Biot critical frequency applied as common friction factor for pore collapse and failure of chalk with different pore fluids and temperatures

Katrine Alling Andreassen, Ida Lykke Fabricius, Niels Nielsen Foged

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A fluid effect toward higher strengths for oil-saturated chalk compared with water-saturated chalk has previously been identified and labeled the "water-weakening phenomenon," but has not been further characterized physically. The hypothesis of this paper is that the Biot critical frequency with a strain or stress-rate dependence can be used to explain this behavior on the pore scale and can be extrapolated to the macroscale failure and pore-collapse properties. A large set of previously published laboratory test results on chalk with different pore fluids was collected, and as a supplement we present a new test series on Stevns chalk with unconfined compression and Brazilian strength results. Copyright © 2011 Society of Petroleum Engineers.
Original languageEnglish
JournalS P E Journal
Issue number4
Pages (from-to)1002-1009
Publication statusPublished - 2011


  • Biot Critical Frequency
  • Chalk
  • Failure
  • Pore collapse

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