Abstract
Due to the importance of formation pore pressure detection, different methods have been established for its estimation. One of these methods is the d-exponent method which is used widely in petroleum industry due to its rapidity and cheapness. In this study we firstly estimate formation pore pressure using the d-exp method by the traditional formula based procedure, then an adaptive network has been applied based on fuzzy interface system (ANFIS) to predict the d-exponent amounts and formation pore pressure in an Iranian oil field. Finally the reliability of resulted network values has been checked by comparing to the traditional methods values. In this network the variables include N (rpm), Average ROP and Bit diameter as the chosen inputs.
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