Publications

Pore Pressure Prediction is crucial to prepare a safe drilling program especially if the well will potentially intersect shallow gas zones. It influences the casing design, drilling mud weight and mitigation of overpressure as a drilling hazard. In the Bentu PSC and Korinci Baru PSC, several wells have experienced blow-outs: Baru-1 (1951), Baru- 2(1967), Korinci-1 (1983) and Segat-1 (1965). These blow-outs led us to conduct a pore pressure study ahead of future drilling. This paper describes the technique used to create 3D pore pressure models. The study used wireline logs, pressure tests, 2D Seismic and drilling data as inputs. The Eaton method is an empirical method to estimate pore pressures from sonic, resistivity and density logs which are calibrated to measured pore pressures from RFT and DST. In the Bentu PSC, the resistivity data did not reliably characterize pore pressure, and density data was incomplete, so the sonic log proved to be the most appropriate source data. Reliable 3D pore pressure distribution required an empirical relationship between pore pressure and velocity. The Bentu PSC 3D model created in this study allowed us to predict pore pressure throughout the block, and was used to design a drilling program especially for delineation wells, including casing design, drilling mud weight, and overpressure prediction to prevent drilling hazards. * EMP Bentu Keyword : Pore pressure Prediction, 3D Model.