Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Studies of hydrate accumulation under multiphase flow conditions
Submission Author:
Erlend Oddvin Straume , PR
Co-Authors:
Rigoberto Morales, Xianwei Zhang, Giovanny Grasso, Amadeu Sum, Erlend Oddvin Straume
Presenter: Erlend Oddvin Straume
doi://10.26678/ABCM.COBEM2017.COB17-1187
Abstract
To further obtain insight into the different processes leading to hydrate deposition and blockage formation in different multiphase systems involving gas, oil and water, multiphase flow experiments with hydrate formation were performed in a custom flow loop, focusing on deposition. The experiments were performed for gas + mineral oil + water systems with 50 to 100% liquid loading, liquid and gas velocities that resulted in various flow regimes included stratified flow, stratified-wavy flow, bubble flow and slug flow, and water-cut up to 30%. The hydrate deposition rate at the upper wall depended on direct contact with liquid phases. Experiments that started with no hydrates in the system before cooling resulted in accumulation and bedding of hydrate-covered water droplets shortly after hydrate onset. The bedded hydrates transformed to hydrate deposit during the experiment. The hydrates deposited gradually at both the upper and lower wall of the testing section in the experiments with circulation of hydrate particles before cooling of the testing section. Greater deposition was observed in tests with higher temperature difference between pre-cooling and testing section than with lower temperature difference. Experiments for under-inhibited water with MEG resulted in less deposition than experiments with fresh water at the same water-cut.
Keywords
Flow assurance, Gas Hydrates, Hydrate depostion, Hydrate management
