Comments on: The flow and heat transfer characteristics of compressed air in high-pressure air injection wells [Arabian Journal of Geosciences (2018) 11: 519]

High pressure has been widely used in the petroleum industry. The commended paper presented a model that can be used to simulate air flow in a vertical wellbore. The novelty and usefulness of the model is good, and the paper deserves to be published in the Arabian Journal of Geosciences. However, we pointed out some critical points that should be noticed by the authors as well as the following researchers who are involved in this area. The comments will show usefulness in pointing out future research direction in wellbore modeling.