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Seismic Guided Drilling Pore-Pressure Prediction Ahead of the Bit
Seismic Guided Drilling (SGD*) predicts formation pressures hundreds of meters ahead of the bit while drilling. The SGD service uses both surface seismic and logging-while-drilling (LWD) data to provide a 3D look-ahead velocity model with reduced uncertainty. This model leads to better geological and geomechanical description enabling proactive drilling decisions, particularly in deepwater exploration. Velocities ahead of the bit are re-calculated from seismic reflections by using LWD velocities behind the bit as a constraint. Compared with pre-drill predictions, this provides much more accurate results, which can be used in velocity-to-pressure transforms to give more reliable formation pressures.
*Mark of Schlumberger