Pressure transient analysis for multi-fractured horizontal well in shale gas reservoirs

摘要

This paper presents the Pressure Transient Analysis (PTA) of the multi-fractured horizontal well with the consideration of adsorption and desorption characteristics of shale gas reservoirs, which were rarely incorporated into previous PTA models. Point-source solutions are derived in Laplace transform domain by using the source function idea and solution of the mathematical model is obtained by the discrete and Gauss elimination methods. Pseudo-pressure and Pseudo-pressure derivative type curves are plotted in order to identify different flow regimes by using the Stehfest algorithm. And the effects of influence factors and flux distribution on discrete elements are also analyzed. The results obtained in this paper have important significance to understand the pressure characteristics and provide the theoretical basis and technical support for exploiting this reservoir efficiently.