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

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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
Volume16
Issue number4
Pages (from-to)1002-1009
ISSN1086-055X
DOIs
Publication statusPublished - 2011

Keywords

  • Biot Critical Frequency
  • Chalk
  • Failure
  • Pore collapse

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