Experimental study on the effect of PVP, NaCl and EG on the methane hydrates formation and dissociation kinetics

The problem of hydrate plug, low efficiency of hydrate dissociation and short production time in hydrate exploitation processes have significantly hindered the commercial viability of gas hydrate extraction. This study investigated the inhibitory effects of ethylene glycol (EG), EG + polyvinyl pyrro...

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Bibliographic Details
Published in:Scientific reports 2024-07, Vol.14 (1), p.16579-16, Article 16579
Main Authors: Shen, Kaixiang, Zhao, Jin, Zhou, Jiawei, Wang, Zonghang, Wang, Yingsheng
Format: Article
Language:English
Subjects:
639/4077/4057
639/4077/4082/4090
639/638/224/685
639/638/675
639/766/94
Efficiency
Ethylene glycol
Humanities and Social Sciences
Hydrate dissociation
Hydrate inhibition
Hydrates
Inhibitors
Kinetic inhibitors
Low temperature
Methane
multidisciplinary
Natural gas hydrate
Polyvinylpyrrolidone
Production stimulation
Science
Science (multidisciplinary)
Sodium chloride
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Summary:The problem of hydrate plug, low efficiency of hydrate dissociation and short production time in hydrate exploitation processes have significantly hindered the commercial viability of gas hydrate extraction. This study investigated the inhibitory effects of ethylene glycol (EG), EG + polyvinyl pyrrolidone (PVP), and EG + PVP + sodium chloride (NaCl) on methane hydrate formation through experiment. The hydrate inhibitory performance is evaluated by using differential of pressure curve, the amount of hydrate, and pressure drop values, and the effects of different temperatures, pressures, inhibitors, and injection time on hydrate dissociation are further studied. The experiment results indicate that the rank of inhibitors combination in terms of effectiveness is 5%EG + 0.5 wt%PVP + 3 wt%Nacl > 10%EG + 1 wt%PVP > 30% EG. At low-temperature conditions, 30% EG exhibits good inhibition of hydrate synthesis but poor dissociation efficiency. As temperature increases, the hydrates dissociation rate with 30% EG also increases. For the combination inhibitor system of EG, PVP, and NaCl, PVP will reduce the dissociation efficiency of hydrates, while EG and Nacl will improve the hydrate dissociation performance. For low production pressure, it is found that 10% EG + 10% NaCl have a good promotion effect on hydrate dissociation, whereas under high production pressure, 20% EG + 10% NaCl is more effective. Furthermore, injecting the inhibitors earlier enhances the dissociation of hydrates more effectively.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-024-67485-w