Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
TEMPERATURE AND SALINITY INFLUENCE ON RHEOLOGICAL PROPERTIES OF AQUEOUS DIUTAN GUM SOLUTION
Submission Author:
Guilherme Pereira Mota , RJ
Co-Authors:
Guilherme Pereira Mota, Roberto Pereira, Eduardo Villela Machado dos Reis
Presenter: Guilherme Pereira Mota
doi://10.26678/ABCM.ENCIT2018.CIT18-0140
Abstract
Using biopolymers is getting more importance as a constituent part of drilling fluids in oil wells. These fluids must have specific characteristics, especially carrying the suspended solids generated by the drilling process. Water-based solutions are indispensable in this environment because, differently of oil-based solutions, they are not harmful to the environment. The present work analyzed the rheological behavior of diutan gum, one of the biopolymers used in the composition of the fluids due to its high viscosity and its emulsifying, and stabilizing characteristics. Diutan gum is a polymer of microbial origin, secreted by bacteria of the genus Sphingomonas, and it is used in other industrial sectors, especially in food industry. Stationary and dynamic tests were performed to observe the behavior of rheological parameters of the samples, such as Elastic, viscous and complex modulus, besides complex viscosity. The analysis of the influence of salt on the rheological properties of the material was also done. The tests were carried out at temperatures of 20ºC, 40ºC and 60ºC, in the proportion of 4300 ppm of diutan gum and 40000 ppm of sea salt. Results were obtained through flow curves and frequency ramps.
Keywords
biopolymer, diutan gum, rheological properties
