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SUMMARY:Numerical Investigation of Geomechanics on Methane Hydrate-bearing
  Sediments - Shun Uchida\,  CUED
DTSTART:20101029T150000Z
DTEND:20101029T160000Z
UID:TALK26411@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:Methane hydrate is a solidified form of methane gas and has be
 en attracting an international interest because of its potential as an alt
 ernative energy resource. It is believed to reside throughout the globe in
  formations beneath areas of permafrost or deep under seabed. Such sites p
 rovide conditions for hydrate to exist: low temperature and high pressure.
  For methane gas production from methane hydrate soils\, the phase equilib
 rium condition has to be artificially shifted (i.e. hydrate dissociation) 
 either by injection of heat energy or by depressurisation of pore water. H
 owever\, through a dissociation process\, geomechanical problems such as s
 ubmarine landslide and wellbore instability may arise due to the fact that
  formation stiffness and strength reduce as hydrate dissociates.\n\nThis t
 alk presents the overview of a coupled thermo-hydro-mechanical formulation
 \,  a constitutive model for hydrate-bearing sediments\, and its applicati
 on to the field methane gas production trials by a depressurisation method
  that conducted at the Mallik site\, Canada in 2007 and 2008.\n
LOCATION:Engineering Department - Lecture Room - LR4
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