Compaction- and Shear-Induced Well Deformation in Tyra: Geomechanics for Impact on Production

Multi-scale numerical geomechanical models for reservoir and overburden deformation in the Tyra chalk field (Denmark) were made and calibrated by laboratory deformation tests and field data. The mechanical interaction between the compacting and deforming formation, cement, and casing was (1) modeled as a function of well orientation, cement distribution, and mechanical properties, (2) followed by probabilistic analysis of the model results in well-failure risking models to gain insight in the effects of rock deformation on well failure, both in space and time, and then (3) used as input in fluid-flow models to forecast the impact of well-failure on production. The risk analysis revealed that, whilst further Tyra compaction will probably lead to more well failure, its impact on production is probably low. Our geomechanical modeling helped to reduce uncertainty in the high-cost multi-year Tyra Future field upgrade planned for the next years to support Tyra production over the next decades.