Characteristic Features of the Movement of Elastic-Visco-Plastic Liquid in Pipes and Layers
Mirza A.Dadash-Zade
Azerbaijan State Oil and Industry University
Ru Cao
Azerbaijan State Oil and Industry University
DOI: https://doi.org/10.59429/pest.v5i4.786
Keywords: Viscoplasticity; Elasticity; Velocity; Volume Flow
Abstract
Hydrocarbon properties, specifically paraffins, asphaltenes, and resins, greatly affect various field practices such as oil drilling, well operations, field development, and pipeline transportation. These compounds impart viscoelastic properties to oils, which means they exhibit both viscous and elastic behavior. Consequently, the internal structure of these oils changes at a slower rate compared to external conditions, leading to non-equilibrium effects. To understand the viscoplastic elastic properties, we propose a model that considers the relaxation properties of the system. This model reveals that over time, these properties result in reduced filtration processes and decreased well productivity for hydrocarbons in porous media. We develop a representation of porous media movement in pipes to better understand this behavior. During the filtration process, the liquid behaves as if it consists of suspended small particles with long relaxation times and viscoelasticity. These particles deform as they pass through the pipe and porous medium, effectively solidifying and becoming fixed. This understanding of viscoelastic properties can be effectively utilized during drilling operations. In specific scenarios, it may be advisable to drill intervals with abnormal oil when the dynamic water pressure in the well is significantly lower than the formation pressure. This recommendation takes advantage of the unique properties of viscoelastic oils.
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