Journal
FUEL
Volume 185, Issue -, Pages 323-338Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2016.07.113
Keywords
Natural gas hydrates; Hydrates slurry; Viscosity; Einstein effective medium theory; Anti-agglomerants
Categories
Funding
- National Natural Science Foundation of China [51306208, 51534007, 51274218, 51134006]
- National Science & Technology Major Project [2016ZX05028004-001]
- Science Foundation of China University of Petroleum-Beijing [2462014YJRC006, 2462015YQ0404]
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The viscosity of natural gas hydrates slurry in high-pressure hydrates slurry rheological measurement system is investigated, which is meaningful for hydrates risk management to solve flow assurance issues in deep-water offshore field. Based on an appropriate stirring speed and time, a relatively uniform and stable hydrates slurry were formed from a water-in-oil emulsion to study the hydrates formation and slurry viscosity under different water cuts, bath temperatures and AAs concentrations. The influence of water cut on hydrates formation and hydrates slurry viscosity is much more significant than that of bath temperature and AAs concentration. Results indicate that the hydrates volume fraction, the continuous liquid phase viscosity and the dispersion degree of hydrates particles in the slurry are the critical factors to affect the viscosity of natural gas hydrates slurry. Considering both of aggregation and breakage of hydrates particles, a natural gas hydrates slurry viscosity semi-empirical model is developed based on the Einstein effective medium theory. The key parameter non-Newtonian coefficient K of this model is determined by several empirical correlations according to the experimental conditions and fluid properties. The consistence of predicted and experimental data demonstrates the feasibility of this model. (C) 2016 Elsevier Ltd. All rights reserved.
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