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SUMMARY:Stress Management In The Context Of Induced Seismicity In Subsurfa
 ce Reservoirs
DTSTART:20200709T160000
DTEND:20200709T180000
DTSTAMP:20260916T201419Z
UID:2337caca9b93b58be20234583e36519ae404edd99b9c0b38896f49cf
CATEGORIES:Conferences - Seminars
DESCRIPTION:Barnaby Padraig Fryer\, Laboratory of Soil Mechanics\, EPFL\nA
 bstract\nThe stress state of the subsurface has been shown to have an infl
 uence on a number of key processes. For this reason\, it has long been 
 recognized that the state of stress is an important parameter for subsurfa
 ce industrial operations such as hydrocarbon production\, Enhanced Geothe
 rmal System (EGS) stimulation\, carbon storage\, and hydraulic fracturing
 . Generally\, however\, the state of stress does not remain constant duri
 ng many of these operations.The numerous effects evidencing a changing st
 ress that have been observed during these operations demonstrate an opera
 tor’s ability to alter the state of stress\, yet deliberate attempts to
  alter the stress state for the benefit of future operations have only be
 en suggested a handful of times.\n\nHere\, this idea of altering the state
  of stress is extended through a series of investigations. Two studies we
 re performed with a focus on limiting the total stress changes that occur 
 during fluid production\, with a view to limit production-induced seismici
 ty. In a following study\, it is suggested thathigh stress path reservoir
 s are attractive targets for fluid injection\, as total stress changes wil
 l result in an increased stability despite increasing pore pressure. Furt
 her\, the concept of stress preconditioning is introduced\, such that ope
 rators alter the stress state of an EGS reservoir to promote more favorab
 le earthquake distributions. These concepts are all forms of reservoir m
 anagement that reduce the risk associated with induced seismicity. Follow
 ing this\, in a numerical study\, the idea of stress preconditioning is e
 xtended to allow for directed stimulation treatments in EGSs. Finally\, t
 he idea of inducing stress jumps through production such that hydraulic fr
 actures do not propagate vertically is evaluated by means of scaling ana
 lyses and numerical simulation\, with implications for carbon storage. M
 ore than the individual propositions\, this thesis promotes the mindset t
 hat\, where appropriate\, attempts should be made to alter the state of s
 tress for the benefit of future operations.\n\nSpeaker\nBarnaby completed 
 his MSc at the TU Delft under the supervision of Prof. Hadi Hajibeygi and 
 Dr. Matteo Cusini on multi-scale reservoir simulation. Barnaby then moved 
 to EPFL\, defending his PhD on subsurface stress management\, performed un
 der the supervision of Prof. Lyesse Laloui and Dr. Gunter Siddiqi\, in a p
 rivate defense in early 2020. Barnaby has since begun a postdoc with Prof.
  Marie Violay in the Laboratory for Experimental Rock Mechanics at EPFL.
LOCATION:Zoom ID: 926 0665 2672 https://epfl.zoom.us/j/92606652672
STATUS:CONFIRMED
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