"Simplified soil-based approach for maximum pressure prediction in hori" by India Clark

Author

India Clark

Date of Award

2025

Document Type

Thesis

Degree Name

Master of Science in Engineering (MSE)

Department

Civil Engineering

Committee Chair

Ashraf Al-Hamdan

Committee Member

Michael Anderson

Committee Member

Abdullahi Salman

Research Advisor

Ashraf Al-Hamdan

Subject(s)

Directional drilling, Soils--Mechanical properties, Pressure--Measurement--Mathematical models

Abstract

Horizontal Directional Drilling (HDD) is a trenchless pipeline installation method used in areas where traditional trenching is not feasible due to environmental concerns, existing infrastructure, or other constraints. However, HDD presents significant engineering challenges, with design failures often resulting from excessive installation stresses and Hydro Fracture. Hydro Fracture occurs when the pressure of drilling fluid exceeds the soil’s bearing capacity, leading to unintended subsurface fractures. To mitigate this risk, researchers have relied on the Delft Equation to estimate the maximum allowable mud pressure for borehole stability. However, this equation does have notable limitations and assumptions, which may not accurately reflect real-world conditions. This research will analyze real field data from HDD projects and compare observed results with a simplified equation. The study aims to identify discrepancies, refine predictive models, and propose improvements to enhance borehole stability assessments and reduce the risk of Hydro Fracture in future HDD applications.

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