Biot Critical Frequency Applied as Common Friction Factor for Chalk with Different Pore Fluids and Temperatures

Katrine Alling Andreassen, Ida Lykke Fabricius

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Injection of water into chalk hydrocarbon reservoirs has lead to mechanical yield and failure. Laboratory experiments on chalk samples correspondingly show that the mechanical properties of porous chalk depend on pore fluid and temperature. Water has a significant softening effect on elastic properties of chalk as calculated from wave data, and the softening increases with increasing critical frequency as defined by Biot. The critical frequency is the highest frequency where wave propagation is controlled by solid-fluid friction. The Biot critical frequency is thus a measure of this friction and we propose that the fluid effect on mechanical properties of highly porous chalk may be the result of liquid‐solid friction. Applying a different strain or stress rate is influencing the rock strength and needs to be included. The resulting function is shown to relate to the material dependent and rate independent b-factor used when describing the time dependent mechanical properties of soft rock or soils. As a consequence it is then possible to further characterize the material constant from the porosity and permeability of the rock as well as from pore fluid density and viscosity which is highly influenced by temperature.
Original languageEnglish
Title of host publication44th US Rock Mechanics Symposium : 5th U.S. -Canada Rock Mechanics Symposium
VolumeProceedings-DVD
Publication date2010
Pages1-10
Publication statusPublished - 2010
Event44th US Rock Mechanics Symposium and 5th U.S. -Canada Rock Mechanics Symposium - Salt Lake City, USA
Duration: 1 Jan 2010 → …
Conference number: 10-453

Conference

Conference44th US Rock Mechanics Symposium and 5th U.S. -Canada Rock Mechanics Symposium
Number10-453
CitySalt Lake City, USA
Period01/01/2010 → …

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