**5. Conclusion**

This paper presents a comprehensive mathematical model to predict the gas productivity of MFHWs in tight gas reservoirs. A commercial simulator (CMG) was used to verify this new model. Our major conclusions can be summarized as follows:


**Author Contributions:** All authors have contributed to this work. Conceptualization, Q.W. and J.W.; methodology, J.W. and L.M.; software, J.W. and R.S.; validation, Y.Y. and L.M.; data curation, Q.W. and R.S.; writing—original draft preparation, Q.W. and MJ.J.; and writing—review and editing, M.J.J. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the National Program on Key Basic Research Project of China (Grant No. 2015CB250900) and the National Oil and Gas Major Project of China (Grant No. 2017ZX05013-006-004).

**Acknowledgments:** The authors acknowledge the Research Institute of Petroleum Exploration and Development, Petrochina for permission to publish this paper. We are also grateful to all the anonymous readers for their constructive comments.

**Conflicts of Interest:** The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
