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SUMMARY:Destabilization of gas hydrate-bearing sediments induced by therma
 l changes. - Gye-Chun Cho\, Assoc Prof\, Dept of Civil &amp\; Environmenta
 l Engineering\, KAIST
DTSTART:20081017T153000Z
DTEND:20081017T163000Z
UID:TALK13309@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:Hydrate-bearing sediments may destabilize spontaneously as par
 t of geological processes\, unavoidably during petroleum drilling/producti
 on operations\, or intentionally as part of gas extraction from the hydrat
 e itself. In all cases\, high pore fluid pressure generation is anticipate
 d during hydrate dissociation. This study centered on the destabilization 
 of gas hydrate-bearing sediments in relation to behavioral characteristics
  and implications\, which is induced by thermal changes. A comprehensive f
 ormulation is derived for the prediction of fluid pressure evolution in hy
 drate-bearing sediments subjected to thermal stimulation without mass tran
 sfer. The formulation considers pressure and temperature-dependent volume 
 changes in all phases\, sediment compressibility\, capillarity\, and the r
 elative solubilities of fluids. Salient implications are explored through 
 parametric studies. Finally\, the analytical formulation is incorporated i
 nto a numerical code\, and the two-dimensional numerical modeling using fi
 nite different method (herein FLAC2D) is conducted to assess the instabili
 ty problem in hydrate-bearing sediments\, in which a steady-state hot well
 bore transfers a heat into surrounding hydrate-bearing sediments\, dissoci
 ates methane hydrate\, and leads to a mechanical failure of sediments. 
LOCATION:Engineering Department - LR6
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