Abstract
This study aims to determine any synergistic effect on hydrate dispersion stability by combining under-inhibited monoethylene glycol (MEG) with synthetic surfactants such as anti-agglomerants (AA). Hydrate dispersion stability describes the tendency of hydrate particles to remain dispersed without agglomerating in an oil-dominated system. The usage of under-inhibited MEG may result in hydrate agglomeration due to self-inhibited MEG that generates unconverted water during hydrate formation stage, contrary to the usage of AA which could improve stability of hydrate dispersion. Differential scanning calorimeter (DSC) was used to measure hydrate dispersion stability via integrated area of hydrate dissociation curves that reduces gradually during repeated hydrate formation-dissociation cycles. Unforseen improvement was recorded at MEG 1–3 wt% and synergistic improvement observed at AA 1 wt% with no further improvement at higher concentration. This reflects the presence of surfactants from natural and/or synthetic may prevent water droplets from coalescing and hydrate particles from aggregating.
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