Gas Hydrate Formation Probability Distributions: The Effect of Shear and Comparisons with Nucleation Theory

Langmuir : the ACS Journal of Surfaces and Colloids
Eric F MayZachary M Aman

Abstract

Gas hydrate formation is a stochastic phenomenon of considerable significance for any risk-based approach to flow assurance in the oil and gas industry. In principle, well-established results from nucleation theory offer the prospect of predictive models for hydrate formation probability in industrial production systems. In practice, however, heuristics are relied on when estimating formation risk for a given flowline subcooling or when quantifying kinetic hydrate inhibitor (KHI) performance. Here, we present statistically significant measurements of formation probability distributions for natural gas hydrate systems under shear, which are quantitatively compared with theoretical predictions. Distributions with over 100 points were generated using low-mass, Peltier-cooled pressure cells, cycled in temperature between 40 and -5 °C at up to 2 K·min-1 and analyzed with robust algorithms that automatically identify hydrate formation and initial growth rates from dynamic pressure data. The application of shear had a significant influence on the measured distributions: at 700 rpm mass-transfer limitations were minimal, as demonstrated by the kinetic growth rates observed. The formation probability distributions measured at this shear...Continue Reading

References

Jul 6, 2014·The Review of Scientific Instruments·Nobuo Maeda
Oct 28, 2015·The Journal of Physical Chemistry. a·Barbara Sowa, Nobuo Maeda

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Citations

Sep 26, 2019·Physical Chemistry Chemical Physics : PCCP·Kwanghee JeongEric F May
Apr 2, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·In Gyu BakJae-Suk Lee

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