Method and system for pore pressure prediction

Abstract

A method for performing an oilfield operation at a wellsite having a drilling rig configured to advance a drilling tool into a subsurface formation. The method includes generating a borehole temperature model for an area of interest using water depth information and a vertical stress model, generating a formation temperature model using the borehole temperature model, generating a mud-weight pressure model using the formation temperature model and pressure coefficients, generating a formation pore pressure model using the mud-weight pressure model, and adjusting the oilfield operation based on the formation pore pressure model.

Description

[0001] Cross References to Related Applications [0002] This application claims U.S. Provisional Patent Application No. 60 / 836,099, entitled "Method, Apparatus, and System for Pore Pressure Prediction from Temperature and Vertical Stress," filed August 7, 2006 in the names of Colin Michael Sayers and Lennert David den Boer Priority of the application, the entire content of which is hereby incorporated by reference, and the claimed application entitled "Method and system for pore pressure prediction" filed on August 6, 2007 in the names of Colin Michael Sayers and Lennert David den Boer ” of U.S. Nonprovisional Patent Application No. 11 / 834,554. Background technique [0003] Accurate estimation of formation pore pressure is a critical requirement for safe and economical drilling in overpressured sediments. Traditional methods of predicting pre-drilling pore pressures are based on seismic wave velocities and velocity-to-pore-pressure conversions calibrated to compensate well d...

AI Technical Summary

Problems solved by technology

Inserting the casing string prematurely can delay oilfield operations and / or reduce the size of the wellbore and result in financial loss

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