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August 16, 2025

Modified Eaton’s Sonic Model for Improved Prediction of Pore Pressure in a Shaly Formation

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Modified model improves pore pressure predictions in shaly formations, suggesting increased drilling safety.

The modified model predicts pore pressure more accurately, achieving a 0.6432% error compared to the original Eaton model.
At depths of 20,000 ft, it predicted 15,293 psi versus RFT-measured 15,392 psi, indicating high reliability.
Observational analysis of shale transit times supported accurate estimations of porosity and bulk density, following expected compaction trends.
The model enhances drilling safety by refining casing depth and mud weight decisions within safe pressure limits.

Idudje et al. (2025) studied this question.

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