Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
A REVIEW ON CONSTITUTIVE EQUATIONS FOR GELLED WAXY CRUDE OIL MODELING
Submission Author:
Fernando Kroetz , PR , Brazil
Co-Authors:
Fernando Kroetz, Tainan Gabardo, Cezar Otaviano Ribeiro Negrao
Presenter: Fernando Kroetz
doi://10.26678/ABCM.ENCIT2018.CIT18-0086
Abstract
Constitutive equations applied to gelled waxy crude oils must be able to predict the different characteristics this material exhibits, such as time-dependency, elasticity and yield stress. Even though several models have been developed over the years, no review has stated the particular characteristics of each model and how in general these equations have evolved to better represent the fluid. This paper aims to point out the main aspects of some constitutive equations developed and used for waxy crude oils. To do so, a chronological approach was used, showing how the oldest models have changed and gotten more complex as time passed by, also including different characteristics of the material. The main concern of the first papers was to model the yield stress and some sort of thixotropy, trying to evaluate a time-dependent yield stress as the gel breaks down. Newer models differ from that approach as other aspects are incorporated into the constitutive equations, such as non-ideal thixotropy, elasticity and plasticity theory concepts.
Keywords
Waxy Crude Oil, Constitutive equations, mathematical modeling
