SPE Journal
Volume 16, Number 4, December 2011, pp. 1002-1009

SPE-130447-PA

Biot Critical Frequency Applied as Common Friction Factor for Pore Collapse and Failure of Chalk With Different Pore Fluids and Temperatures

View full textPDF ( 621 KB )

DOI  More information 10.2118/130447-PA http://dx.doi.org/10.2118/130447-PA

Citation

  • Andreassen, K.A., Fabricius, I.L., and Foged, N.N. 2011. Biot Critical Frequency Applied as Common Friction Factor for Pore Collapse and Failure of Chalk With Different Pore Fluids and Temperatures. SPE J.  16 (4): 1002-1009. SPE-130447-PA. http://dx.doi.org/10.2118/130447-PA.

Discipline Categories

  • 6.1.10 Reservoir Geomechanics
  • 6.3.4 Compaction
  • 6.3.1 Flow in Porous Media

Keywords

  • Chalk, Failure, Pore collapse, Biot Critical Frequency

Summary

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.

© 2011. Society of Petroleum Engineers

View full textPDF ( 621 KB )

History

  • Original manuscript received: 28 February 2010
  • Meeting paper published: 15 June 2010
  • Revised manuscript received: 7 October 2010
  • Manuscript approved: 11 December 2010
  • Published online: 27 June 2011
  • Version of record: 23 December 2011