Models of stress and strain surrounding a thermal wellbore have been constructed using integrated point-source thermoporoelastic solutions in a homogeneous medium. These models show that a buildup of pore-pressure in shales in the neighbourhood of a wellbore can occur in response to heating, and that the severity of the overpressure is controlled by the hydraulic diffusivity, the stiffness and the thermal behavior (expanding/compacting) of the shale. A rock physics model based on observations from recent thermal core tests is used to relate changes in volumetric strain to velocity changes, which in turn can be related to time-strain for both PP and PS data. Time-strain data containing local wellbore anomalies over a Steam Assisted Gravity Drainage operation can be interpreted using the modeling results, although the spatial extent of the anomalies requires further numerical modeling to confirm.
SEG 2016 presentation details
Date: Wednesday, October 19, 2016
Time: 2:45:00 PM
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