As one of the important economic indicators for the development of shale/tight reservoirs

the production performance and EUR calculation of shale/tight wells is an important subject in unconventional reservoir engineering. This has been challenging for the reservoir engineers from both China and other country for a dozen of years. Based on the understanding of the unique geological characteristics of shale/tight reservoirs

this paper describes in detail the production performance of those wells producing extremely tight reservoirs

from which the inapplicability of using traditional methods has been explained. Further

a new methodology and the workflow has been presented from SPEE recommendations

and one practical example has also been illustrated of implementing the workflow.