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SUMMARY:Cavity expansion in locked sand - Stephan Van Eeden\, CUED
DTSTART:20181206T160000Z
DTEND:20181206T164500Z
UID:TALK113065@talks.cam.ac.uk
CONTACT:Magdalena Charytoniuk
DESCRIPTION:The Athabasca oil sand deposit in Northern Alberta\, Canada co
 ntains approximately 200 billion cubic meters of bitumen. This sand deposi
 t has a dense uncemented locked sand structure (relative density exceeding
  100%) with interstitial bitumen filling its pore space. Sample disturbanc
 e makes sampling this material in its intact state very difficult. Pressur
 emeter testing is proposed as an alternative method of reliably determinin
 g material parameters for reservoir modelling at insitu stress levels. As 
 far as extraction planning is concerned\, one of the most important\, yet 
 difficult\, parameters to quantify accurately is the insitu permeability. 
 Due to its locked sand structure\, this material is highly dilative and it
 s insitu permeability is known to increase significantly when sheared. The
  aim of this research was to develop a methodology to derive the change in
  permeability due to shear dilation using cavity expansion theory. A serie
 s of laboratory scale cavity expansion experiments were conducted on locke
 d sand to study both its drained and undrained behaviour during cavity exp
 ansion. In this seminar a comparison of the drained behaviour of locked sa
 nd in its intact and reconstituted states will be presented\, as well as t
 he finite element modelling conducted to derive material parameters from t
 he test data. The undrained behaviour of the material during a sequence of
  loading-holding stages is presented. The evolution of void ratio in the s
 oil annulus surrounding the expanding cavity will be shown and compared to
  what is commonly assumed in cavity expansion theory.
LOCATION: Cambridge University Engineering Department\, Lecture Room 6
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