Making Sense of Water Injection Fractures in the Dan Field

Abstract

Summary: Water injection above fracture propagation pressure is used to provide improved recovery in the Dan field, a low permeability chalk oil field located offshore Denmark. Several monitoring techniques have been applied to evaluate fracture height, length, orientation, and injector/producer interaction, including: openhole and through casing saturation logging, tracer injection, producer water cut monitoring, and falloff surveys in injection wells. This paper presents the different monitoring techniques, the development of a fracture growth model, and various examples of the way the model has been used to enhance the understanding of field data.