Amin Daryasafar - M.S. Student, Department of Petroleum Engineering, Ahwaz Faculty of Petroleum, Petroleum University of Technology, Ahwaz, Iran
Mohammad FathiNasab - M.S., Student, Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
Giovanni Da Prat - Professor, Da Prat & Associates (Consulting Company), Buenos Aires, C۱۴۲۰, Argentina
Riyaz Kharrat - Professor, Department of Petroleum Engineering, Montanuniversität Leoben, Austria

In this paper, decline curve analysis is used for estimating different parameters of bounded naturally fractured reservoirs. This analysis technique is based on rate transient technique, and it is shown that if production rate is plotted against time on a semi-log graph, straight lines are obtained that can be used to determine important parameters of the closed fractured reservoirs. The equations are based on Warren and Root model. The comparison between the results of this technique and those of the conventional methods confirms its high proficiency in transient well testing. It should be noted that in conventional decline curve methods, parameters such as interporosity flow parameter and storage capacity ratio must be first obtained by previous methods like the build-up analysis, but in the proposed method all the main reservoir parameters can be calculated directly, which is one of the advantages of this method. This paper focuses on the interpretation of rate tests, and the starting points and slopes of straight lines are utilized with proper equations to solve directly for various properties. The main important aspect of the presented method is its accuracy since analytical solutions are used for calculating reservoir parameters.

decline curve analysis, Naturally Fractured Reservoirs, Pseudo-steady, Rate Transient, reservoir properties, State Condition