Casing deformation as a consequence of reservoir compaction and surface subsidence has occurred in the Ekofisk Field. Casing deformation database results show that reservoir deformations occur throughout the field, while overburden deformations occur primarily on the field flanks. Deformation geometry shows compressive loading of casings in the reservoir resulting in axial buckling. In the overburden, deformation geometry suggests formation movement along near horizontal features. Identification of the deformation mechanisms will be used to refine mitigative techniques which minimize casing loading, thus enhancing well life.