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9 - Geopressure Detection and Prediction in Real Time
Nader C. Dutta, Ran Bachrach, Tapan Mukerji, Stanford University, California
Book:

Quantitative Analysis of Geopressure for Geoscientists and Engineers

Published online:

10 February 2021

Print publication:

11 March 2021, pp 348-367
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Summary

This chapter discusses several techniques for detection and analysis of geopressure in real time. This deals with real-time updates of a predrill pore pressure model during drilling. This is an important phase during which real-time data are acquired, processed, and integrated with the model so that an updated look-ahead and look-around (drill bit) image of geopressure is made.This way, as drilling continues, the cone of uncertainty will reduce. All real-time sensors such as the logging-while-drilling (LWD) tools are at least a hundred or more feet behind the bit. Therefore, calibration must be done in three steps - behind the bit (using all processed logs, including wireline), at the bit (mostly real-time logs), and look-ahead of and around the bit (mostly calibrated seismic model).