MEG Optimizing Strategy Using under-Inhibition to Prevent Hydrate Blockage in Offshore Long Distance Tie-Backs

摘要

Hydrate fraction was investigated at different MEG concentration bymeasuring hydrate onset time and gas consumption rate during hydrateformation. It is confirmed that the hydrate onset time becomes longerand hydrate fraction is reduced significantly at the MEG concentrationof 30.0 wt% MEG. The hydrate fraction in 30.0 wt% MEG solutionwas 0.08, which is less than the hydrate fraction of 0.38 when forminghydrates in pure water. ~(13)C NMR spectra of hydrates formed in thepresence of MEG indicate structure II is formed from pure water andMEG solution.