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From the wellbore fluid mechanics, the 70 wellbore pressures of 6 wells in the H3 gas reservoir in Daniudi gas field were calculated by using the average temperature and the average gas deviation factor method in this paper. The results showed that this method can be used for calculating of the wellbore pressure, and then the linear relation between the casing pressure and the wellbore pressure was constructed by regression analysis method. This method has the advantages of simpler procedure and fewer test data in the process of calculating the open flow.