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Debonding of well cement towards casing or rock, i.e. microannuli formation, is a typical failure mode of cement barriers. Consequently, such microannuli may act as leak paths during leakages of downhole fluids such as hydrocarbons or CO₂. Current leakage models usually assume that microannuli have...

In this study, our recent and new approach for detailed tracking of the interface between well fluid and cement by using particles is investigated. The particles can enable us to know the precise location of the interface between two fluids and be sure about displacement efficiency in the annulus...

Static and dynamic moduli of a sandstone may be different and stress-sensitive. Knowledge about this is important for the interpretation of seismic data and sonic logs. We use a numerical model which is based on the discrete element method (DEM) to study the static and the dynamic mechanical...

Time-lapse (4D) seismic data analysis is widely used to monitor producing hydrocarbon or CO₂ storage reservoirs and their surroundings. The influence of potentially significant undrained pore-pressure changes around depleting (or injected) reservoirs appears to be neglected in most previous studies...

The prediction of stress and strain changes in and around reservoir using numerical simulators is often based on assumption of linear elasticity before reaching yield point. However, it is known that rocks are generally behaving non-linearly and a deviation from purely elastic response begins...