Micromechanical cohesion force measurements to determine cyclopentane hydrate interfacial properties

[Display omitted] ► Direct measurements of hydrate cohesion shown in water, hydrocarbon and gas phases. ► Unconverted water on the hydrate surface increases cohesive forces through a capillary bridge. ► Hydrate adhesive force on stainless steel reduced by 96% through a wax coating on the surface. Hy...

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Veröffentlicht in:Journal of colloid and interface science 2012-06, Vol.376 (1), p.283-288
Hauptverfasser: Aman, Zachary M., Joshi, Sanjeev E., Sloan, E. Dendy, Sum, Amadeu K., Koh, Carolyn A.
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Sprache:eng
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Zusammenfassung:[Display omitted] ► Direct measurements of hydrate cohesion shown in water, hydrocarbon and gas phases. ► Unconverted water on the hydrate surface increases cohesive forces through a capillary bridge. ► Hydrate adhesive force on stainless steel reduced by 96% through a wax coating on the surface. Hydrate aggregation and deposition are critical factors in determining where and when hydrates may plug a deepwater flowline. We present the first direct measurement of structure II (cyclopentane) hydrate cohesive forces in the water, liquid hydrocarbon and gas bulk phases. For fully annealed hydrate particles, gas phase cohesive forces were approximately twice that obtained in a liquid hydrocarbon phase, and approximately six times that obtained in the water phase. Direct measurements show that hydrate cohesion force in a water-continuous bulk may be only the product of solid–solid cohesion. When excess water was present on the hydrate surface, gas phase cohesive forces increased by a factor of three, suggesting the importance of the liquid or quasi-liquid layer (QLL) in determining cohesive force. Hydrate-steel adhesion force measurements show that, when the steel surface is coated with hydrophobic wax, forces decrease up to 96%. As the micromechanical force technique is uniquely capable of measuring hydrate-surface forces with variable contact time, the present work contains significant implications for hydrate applications in flow assurance.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2012.03.019