Abstract

              <jats:p>This research is focused on understanding the phase behavior of gas hydrate formation in the gas dominant multiphase pipelines containing mixed gas with high CO<jats:sub>2</jats:sub>, crude oil, and deionized water. The experimental conditions are in the pressure range of 3–7 MPa with water cut as 20% of the volume. Initially, the effect of high CO<jats:sub>2</jats:sub> content in natural gas on the phase boundary conditions of hydrates is studied through simulation (CSMGEM software) and experiments. Later, an additional phase of crude oil was introduced, with 15% of the volume to study the multiphase system. From the experimental analysis, thermodynamic equilibrium conditions were found, and the hydrate-liquid–vapor-equilibrium (HLVE) curves were drawn. The phase behavior is comprehended by comparing the HLVE curves of pure and multiphase systems. It is found that the high CO<jats:sub>2</jats:sub> content tends to promote the gas hydrate formation. Based on the results, temperature variance and enthalpy of formation were calculated for the multiphase system. With a difference of 1.32 average temperature variance, the multiphase system exhibits inhibition. A basic statistical regression model was made to predict the gas hydrate formation in multiphase transmission pipelines. This work helps in understanding the effect of a new phase on gas hydrate formation.

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The different versions of the original document can be found in:

https://doaj.org/toc/2045-2322 under the license cc-by
http://www.nature.com/articles/s41598-020-71509-6,
http://dx.doi.org/10.1038/s41598-020-71509-6
https://academic.microsoft.com/#/detail/3084027378 under the license https://creativecommons.org/licenses/by/4.0
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Published on 01/01/2020

Volume 2020, 2020
DOI: 10.1038/s41598-020-71509-6
Licence: Other

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