Comprehensive modeling of surge and swab pressures in eccentric annuli: a mathematical and computational approach

Date

2023-9-06

Author

Erge, Öner

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Estimating swab and surge pressures accurately is critical in the drilling industry, particularly in narrow pore and fracture pressure margins. This study presents an improved numerical model for predicting surge and swab pressures in eccentric annuli, incorporating yield pseudoplastic fluids and temperature effects on rheological parameters. The model utilizes a finite difference scheme and a modified eccentric annulus representation, composed of an infinite number of concentric annuli with varying outer radii. Computational fluid dynamics (CFD) analysis is performed to validate the numerical model, which is further verified using experiments, and literature models with differences in the range of 1-15% are found. Two surrogate models, Artificial Neural Network (ANN) and Random Forest (RF), are developed based on the proposed numerical model to provide accurate and computationally efficient alternatives for real-time applications. The study outlines the derivation and validation of the numerical model, followed by the development and evaluation of the ANN and RF surrogate models. Overall, the proposed approach offers an improved method for predicting swab and surge pressures in eccentric annuli, contributing to safer and more efficient drilling operations.

Subject Keywords

Surge and swab pressures, Numerical modeling, Surrogate modeling, CFD, Eccentric annulus

URI

https://hdl.handle.net/11511/105529

Collections

Graduate School of Natural and Applied Sciences, Thesis