Tridimensional (3D) modeling of pore pressure gradient is usually based on seismic data and calibrated with well data. Tridimensional models based exclusively in well data are not common in the oil industry. However, well data are regulary used to derive unidimensional models of the pore pressure gradient. The current work presents 3D models of pore pressure gradient using the Eaton method and Bowers method, derived from 14 wells data in a Brazilian field. The methodology used was based in the software Drillowrks 3D, from Knowledge Systems. The undercompaction mechanism was considered as the overpressure generator. Although the seismic data are the most commonly used in oil and gas industry for 3D pore pressure modeling, a case study presented herein shows that using wells data for 3D pore pressure modeling is satisfactory, with errors less than 1ppg in both methods in respect to direct measurements of pore pressure.