The tight F and D units of the Bu Hasa field, in onshore Abu Dhabi, have undergone limited production, and are considered good candidates for a miscible gas injection project.

A field pilot was implemented with the objective of evaluating the potential of miscible gas displacement as a secondary recovery mechanism in this tight carbonate formation. A compositional simulation model was built to describe the mechanism involved in the process, and to predict the pilot performance.

The Peng-Robinson equation of state was used with a 4 pseudo-components system, based on a 13 components formulation. It was tuned on PVT laboratory data, and produced a good match of experimental results of slim tube tests.

A 3D radial model was constructed to represent the pilot. Simulation results indicate the development and propagation of a miscible front.

After validation by field data, the model will be used to predict the performance of a miscible gas injection development scheme, extended to the whole reservoir.

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