Gas Hydrate Sloughing as Observed and Quantified from Multiphase Flow Conditions

Erlend O. Straume, Celina Kakitani, Luis A.Simões Salomão, Rigoberto E.M. Morales*, Amadeu K. Sum

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Sloughing of gas hydrates from deposits formed on the pipe wall is a phenomenon that can cause hydrate accumulation and blockage of the flow in oil/gas pipelines. While hydrate sloughing has been recognized as an important mechanism leading to hydrate blockage, its observation and measurements have not been reported. Experiments performed in a visual rocking cell to emulate multiphase flow conditions with a methane-ethane gas mixture, fresh water, and non-emulsifying oil or condensate as hydrocarbon liquid demonstrated that hydrate sloughing occurs at a wide range of subcooling and temperature gradient conditions. However, sloughing was not detected in a narrow operational window defined by both subcooling lower than 4 °C and temperature gradient in the cell lower than 1 °C. The potential existence of an operational window for conditions without sloughing might be valuable for the development of hydrate management strategies for blockage-free production.

Original languageEnglish
Pages (from-to)3399-3405
Number of pages7
JournalEnergy and Fuels
Volume32
Issue number3
DOIs
Publication statusPublished - 15 Mar 2018

Bibliographical note

Funding Information:
This research was funded by Repsol Sinopec Brasil supported by the National Agency of Petroleum, Natural Gas and Biofuels (ANP), Brazil. Amadeu K. Sum thanks Petrobras for sponsoring his sabbatical leave at Federal University of Technology of Paraná during part of the time that this study was performed. The authors also acknowledge the help and support from Giovanny Grasso, who originally built the rocking cell system at Colorado School of Mines.

Funding Information:
This research was funded by Repsol Sinopec Brasil supported by the National Agency of Petroleum, Natural Gas and Biofuels (ANP) Brazil. Amadeu K. Sum thanks Petrobras for sponsoring his sabbatical leave at Federal University of Technology of Parana during part of the time that this study was performed. The authors also acknowledge the help and support from Giovanny Grasso, who originally built the rocking cell system at Colorado School of Mines.

Publisher Copyright:
© 2018 American Chemical Society.

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