Prevention of methane hydrate re-formation in transport pipeline using thermodynamic and kinetic hydrate inhibitors

Kim, Jakyung; Kim, Hyunho; Sohn, Young Hoon; Chang, Daejun; Seo, Yutaek; Kang, Seong-Pil

doi:10.1016/j.petrol.2017.04.011

Cited by 51 publications

(25 citation statements)

References 25 publications

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“…However, under a high degree of supercooling, large amount of THI becomes non‐viable. Addition of low dosage of kinetic hydrate inhibitors (e. g., polymer‐based inhibitor or more recently, ionic liquids and amino acids have been proposed,) can slow down the hydrate nucleation rate long enough to overpass the residence time of methane and water mixture in the transport pipelines …”

Section: Properties Of Methane Hydratementioning

confidence: 99%

Methane Hydrate in Confined Spaces: An Alternative Storage System

2018

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Methane hydrate inheres the great potential to be a nature-inspired alternative for chemical energy storage, as it allows to store large amounts of methane in a dense solid phase. The embedment of methane hydrate in the confined environment of porous materials can be capitalized for potential applications as its physicochemical properties, such as the formation kinetics or pressure and temperature stability, are significantly changed compared to the bulk system. We review this topic from a materials scientific perspective by considering porous carbons, silica, clays, zeolites, and polymers as host structures for methane hydrate formation. We discuss the contribution of advanced characterization techniques and theoretical simulations towards the elucidation of the methane hydrate formation and dissociation process within the confined space. We outline the scientific challenges this system is currently facing and look on possible future applications for this technology.

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Section: Properties Of Methane Hydratementioning

confidence: 99%

Methane Hydrate in Confined Spaces: An Alternative Storage System

2018

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“…When mixing KHIs with MEG, the observed synergistic effect with reduced MEG dosage and maintained inhibition power could be seen as a joint effort from both sides. As a typical THI, MEG would lower the fugacity coefficient of water 29 and change the hydrate phase boundary via hydrogen bonding with water. 48 In both systems, we observed that the inhibitive effect of mixed KHI−MEG formulations was increased with the increased concentration of MEG when the amount of KHI remained constant.…”

Section: Meg When Used Alonementioning

confidence: 99%

“…Therefore, the synergistic effect from the MEG side mostly related to the shifted equilibrium boundary was undeniable. 29 Therefore, we suggest that sufficient MEG should be injected into the pipeline during transportation, either used alone or in conjunctive use with KHI polymers for favorable synergism. 3.2.5.…”

Section: Meg When Used Alonementioning

confidence: 99%

“…In industry, mixing varied petrochemicals can be useful to generate more effective formulations for different applications or circumstances. , In the aspect of avoiding hydrate formation and growth, many researchers mixed THIs with KHIs to reduce the amount of THIs used in operation; meanwhile, keeping an acceptable inhibitive effect. ,, Glycol ether compounds are one of the most studied types of synergists of KHIs . Kim et al found that the mixture of PVCap and MEG could reduce the concentration of MEG required for preventing hydrate formation with simulation and experiments.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Evaluation of Kinetic Hydrate Inhibitors and Mixed Formulations with Monoethylene Glycol for Hydrate Prevention in Pure Water and Brine–Oil Systems

Yang¹,

Zhao³

et al. 2020

Energy Fuels

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Thermodynamic hydrate inhibitors (THIs) and kinetic hydrate inhibitors (KHIs) are widely studied and used in the oil & gas industry for hydrate prevention. In this experimental study, we applied an isothermal procedure and tested four different KHIspoly(vinylpyrrolidone) (PVP), Inhibex 501, Luvicap EG, and VC-713KHI−KHI mixtures, and KHI−MEG (monoethylene glycol) mixtures to evaluate their inhibitive performance on structure II methane−propane hydrate formation in stirred reactors. Two liquid systems (pure water and brine−oil−water), two cooling rates (6 and 4.5 K/h), and two subcooling levels (12.8 and 7.8 K) were examined. The results showed that, with single KHI dosing, Inhibex 501 has the best inhibitive effect in the pure water system, while Luvicap EG and VC-713 performed better in the brine−oil−water system. The performance of KHI−KHI mixtures was found to be similar to that of the single KHI composition of lower molecular weight. In experiments with KHI−MEG mixtures, MEG contributed to the combined inhibitive effect mostly for its thermodynamic effect on the system equilibrium; on the other hand, low concentration KHIs in the mixed formulations showed a synergistic effect that could not only reduce the dosage of MEG but also maintain the overall inhibitive effect on hydrate formation. The addition of NaCl and mineral oil may also prevent hydrate growth owing to water−salt ion interactions and interfacial barrier effects of the mineral oil.

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“…Thus, chemical hydrate inhibitors are commonly utilized in the industry for hydrate inhibition and prevention of methane hydrate reformation. − They are classified as low-dosage hydrate inhibitors (LDHIs) and thermodynamic hydrate inhibitors (THIs) . THIs work by moving the hydrate phase boundary toward lower temperatures and higher pressures, thus increasing the hydrate-safe region .…”

Section: Introductionmentioning

confidence: 99%

Hydrate Phase Equilibria for Methyldiethanolamine and Empirical Modeling for Prediction

et al. 2018

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The issue of gas hydrates in gas pipelines is commonly addressed by injecting hydrate inhibitors at the well heads. Alongside these inhibitors, other chemical additives are also injected to address various concerns such as to reduce the risk of corrosion and scaling. However, it is not clear how the combined chemical cocktail affects gas hydrate formation over a wide pressure range. Monoethylene glycol (MEG) and methyldiethanolamine (MDEA) are common chemicals that are usually used as part of hydrate inhibition and corrosion control programs respectively. Thus, in this study, the methane hydrate inhibition performance of MDEA in the presence and absence of MEG was assessed. The study produced new hydrate phase equilibria data at a high pressure range, suggesting MDEA performs as a thermodynamic hydrate inhibitor and thus enhances the hydrate inhibitory performance of MEG. Furthermore, because there does not appear to be any flow assurance prediction software that has the capability to simulate the effect of MDEA on hydrate formation, an algorithm that can accurately predict the equilibrium temperature of aqueous MDEA solutions with and without MEG was developed. The algorithm is based on the empirical modeling of the experimental data obtained in this study. This work will thus aid in the industrial application of hydrate inhibitors and improve gas hydrate prevention in production pipelines.

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Prevention of methane hydrate re-formation in transport pipeline using thermodynamic and kinetic hydrate inhibitors

Cited by 51 publications

References 25 publications

Methane Hydrate in Confined Spaces: An Alternative Storage System

Methane Hydrate in Confined Spaces: An Alternative Storage System

Experimental Evaluation of Kinetic Hydrate Inhibitors and Mixed Formulations with Monoethylene Glycol for Hydrate Prevention in Pure Water and Brine–Oil Systems

Hydrate Phase Equilibria for Methyldiethanolamine and Empirical Modeling for Prediction

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