Large-scale hydraulic fracturing is an essential method to reconstruct tight shale reservoirs and to achieve industrial development of shale gas. Therefore, shale gas wells are typically characterized by high production and steep decline rate at the initial stage and stable low production rate at the later stage. The traditional decline curve analysis is no longer applicable to shale gas production forecast and reserve assessment, because of the unique flow mechanism of desorption in shale gas reservoirs. In order to improve the accuracy in production prediction and EUR estimation for shale gas wells, a set of approach and process for assessment of shale gas recoverable reserves was introduced in this paper, after the pros and cons of 4 types of shale gas EUR estimation methods in application of shale gas wells in Block Changning, the Sichuan Basin being analyzed. The diagnosis of flow regime in shale gas wells indicates that the OGIP of a shale gas well can be determined more accurately when the well reaches the pseudo-steady flow and the EUR of a shale gas well can be estimated more reliably with the analytical method. The approach was used to estimate the 20-year EUR (EUR20a) of five shale gas wells in Block Changning, and the difference between the predicted and actual cumulative gas production in the 4th year is less than 5.2%. The field application results confirmed the high reliability and practicality of the method, which provides a new and efficient solution for shale gas production prediction and EUR estimation.