A new method of Arps decline research - nonlinear fitting

Abstract

Arps decline is widely used in the research and prediction of production decline law. At present, linear graphical is the conventional method of Arps decline research, which first determines the decline type and then determines the decline index. The judgment of decline type is subjective, and the determination accuracy of decline index is low, which affects the understanding of production decline law to a certain extent. Therefore, this paper proposes a nonlinear fitting for Arps decline research. The method determines the decline index first, and then determines the decline type. The accuracy of the decline index is high, and the judgment of decline type is more objective, which is conducive to the correct understanding of the production decline law. Taking Zizhou gas field as an example, the effect of two methods of Arps decline research is compared and analyzed, and the effectiveness of nonlinear fitting is verified, and good application results are obtained.