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This research aims to understand how pressure, temperature, and aging influence the flow behavior and yield stress of waxy crude oils.

June 20, 2026Results in EngineeringOpen Access

Pressure-Induced Structuring and Yield Stress of Waxy Crude Oils

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Randomized trial investigates pressure effects on yield stress in waxy crude oils, indicating significant implications for pipeline flow assurance.

This research aims to understand how pressure, temperature, and aging influence the flow behavior and yield stress of waxy crude oils.
Investigated three waxy crude oils with varying wax content and WAT values under controlled thermal and pressure conditions up to 300 bar.
Utilized differential scanning calorimetry and high-pressure rheometry to assess the flow behavior.
Examined the effects of different pressurizing mediums on gel structure.
Viscosity demonstrated an exponential relationship with pressure, with piezoviscous coefficients ranging from 18-20 GPa⁻¹ at 60°C and 26-32 GPa⁻¹ at 4°C.
Pressure affected the WAT, increasing it by approximately 0.25°C MPa⁻¹ and enhancing gel strength when applied during cooling.
After one hour of aging, yield stress increased by about 0.3% per bar of pressure applied.

Martín-Alfonso et al. (2026) studied this question.

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June 20, 2026Results in EngineeringOpen Access

View Full Paper

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Authors

Randomized trial investigates pressure effects on yield stress in waxy crude oils, indicating significant implications for pipeline flow assurance.

This research aims to understand how pressure, temperature, and aging influence the flow behavior and yield stress of waxy crude oils.
Investigated three waxy crude oils with varying wax content and WAT values under controlled thermal and pressure conditions up to 300 bar.
Utilized differential scanning calorimetry and high-pressure rheometry to assess the flow behavior.
Examined the effects of different pressurizing mediums on gel structure.
Viscosity demonstrated an exponential relationship with pressure, with piezoviscous coefficients ranging from 18-20 GPa⁻¹ at 60°C and 26-32 GPa⁻¹ at 4°C.
Pressure affected the WAT, increasing it by approximately 0.25°C MPa⁻¹ and enhancing gel strength when applied during cooling.
After one hour of aging, yield stress increased by about 0.3% per bar of pressure applied.

Martín-Alfonso et al. (2026) studied this question.

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