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    A New Method for Research on Unsteady Pressure Dynamics and Productivity of Ultralow-Permeability Reservoirs by Kun Wang, Li Li, Xiao Chen, Wei Liang, Yong Yang, Zhenghe Yan, Jianwen Dai, Wei Li, Yahui Wang, Weifang Wang, Min Li, Danling Wang

    Published 2021-01-01
    “…On that basis, instead of a constant skin factor, a well-test interpretation mathematical model is established by defining and using a time-varying skin factor. The time-varying skin factor changes with the change of stress sensitivity and threshold pressure gradient. …”
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