Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Revisited Model for Inward and Outward Growth of Gas Hydrate Particles in Water-in-Oil Emulsions
Submission Author:
Carlos Lange Bassani , Bayern
Co-Authors:
Carlos Lange Bassani, Ana Cameirão, Jean-Michel HERRI, Amadeu Sum, Rigoberto Morales
Presenter: Carlos Lange Bassani
doi://10.26678/ABCM.ENCIT2018.CIT18-0491
Abstract
The correct prediction of gas hydrate formation is important to estimate pipeline blockage (plugging) in oil and gas production operations. This study presents a revisited model for growth of gas hydrates in water-in-oil emulsions. Literature points out that hydrates form as shells around the water droplets. The water core shrinkage rate (inward growth) is related to gas diffusion through the hydrate shell, while water permeation through the hydrate shell is the limiting phenomenon for outward growth. The models of literature are herein corrected (consideration of gas solubility in the hydrate shell, consideration of gas concentration along the shell coupled with gas consumption in the outer surface, correct coupling between gas absorption by the bulk and gas consumption due to hydrate formation, consideration of the entire particle population for hydrate formation rate, plus minor modeling corrections) and extended for considering the crystal integration process in the outer particle surface and the mass transfer between the particle and the bulk. The model is compared to experimental data and the trend of the gas consumption due to hydrate formation is validated, though model closure is still an open question.
Keywords
Flow assurance, Gas Hydrates, particle growth, Mass transfer
