Enhancement of the performance of kinetic inhibitors in the presence of polyethylene oxide and polypropylene oxide for binary mixtures during gas hydrate formation in a flow mini‐loop apparatus

Abstract

The objective of this work is to demonstrate the impact of the polyethylene oxide (PEO) and polypropylene oxide (PPO) on the performance of gas hydrate kinetic inhibitors for binary mixtures during gas hydrate formation in a flow mini-loop apparatus. PEO and PPO are commercially available polymers that they have been considered to be unable to exhibit kinetic hydrate inhibition (KHI) by their self. Prevention of gas hydrate formation experiments in the presence of the KHIs solutions were conducted in a flow mini-loop apparatus manner under suitable pressures and temperature conditions for binary gaseous mixtures including 70% CH 4 /30% C 3 H 8 , 30% CH 4 /70% C 3 H 8 , 70% CH 4 /30% i-C 4 H 10 , and 30% CH 4 /70% i-C 4 H 10 . In the experiments, induction time for crystallisation of gas hydrate formation and gas consumption rate are investigated in systems without KHI, containing KHI only (such as polyvinylpyrrolidone (PVP) and L-tyrosine) and PEO or PPO together with KHI. Pressure is maintained at a constant value during experimental runs by means of required gas make-up. The addition of a KHI into system delayed the onset of hydrate crystal nucleation. Furthermore, addition of the PEO or PPO to a KHI solution was found to enhance the performance of KHI. In addition, under the same pressure temperature hydrate formation conditions the induction time is longer when the PPO is present. Thus, inclusion of PPO into a KHI solution shows a higher enhancement in its inhibiting performance compare to PEO. L'objectif de ce travail est de démontrer l'impact de l'oxyde de polyéthylène (PEO) et l'oxyde de propylène poly (PPO) sur la performance des hydrates de gaz inhibiteurs cinétiques pour des mélanges binaires lors de la formation des hydrates de gaz dans un appareil de débit mini-boucle. PEO et PPO sont les polymères commercialement disponibles qu'ils ontété considérés comme incapables d'exposer cinétique d'inhibition de l'hydrate (KHI) par leur auto les expériences. De Prévention des formation des hydrates de gaz en présence des solutions KHIs ontété menées dans un appareils de débit mini-boucle sous la pression appropriée et des conditions de température pour les mélanges binaires de gaz dont 70% de CH4 / 30% C3H8, 30% de CH4 / 70% C3H8, 70% de CH4 / 30% i-C4H10, et 30% de CH4 i / 70%-C4H10. Dans les expériences, le temps d'induction pour la cristallisation de la formation des hydrates de gaz et le taux de consommation de gaz sontétudiés dans les systèmes sans KHI, contenant KHI seulement (comme PVP et L-tyrosine) et PEO ou PPO avec KHI. La pression est maintenueà une valeur constante au cours de cycles expérimentaux au moyen d'injecter de gaz nécessaire. L'ajout d'un KHI dans le système, retardé le début de la nucléation des cristaux d'hydrate. En outre, plus de la PEO ou PPOà une solution KHI aété trouvé pour améliorer la performance de KHI. En outre, lorsque le PPO est présent dans les mêmes conditions de temperature, de pression de formation d'hydrates le temps d'induction est plus longue. Ainsi, l'inclusion de la...

Synergism of thermodynamic hydrate inhibitors on the performance of poly (vinyl pyrrolidone) in deepwater drilling fluid

“…Yang and Tohidi (Yang and Tohidi, 2011) reported that glycol ether compounds noticeably prolong the nucleation time of PVCap and extend the delay of catastrophic growth by several times. Talaghat (Talaghat, 2012(Talaghat, , 2014 reported that PEO and PPO (polypropylene oxide) showed enhancement on the performance of PVP, L-tyrosine and modified starch toward binary hydrate formation in a flow mini-loop apparatus. Chua and Kelland (Chua and Kelland, 2012) reported that TBAB (tetrabutylammonium bromide) gave synergistic effect on the performance of PVCap, and kelland et al (Kelland et al, 2013a) found that the best tris (dialkylamino) cyclopropenium chloride salts performed better as synergists than TBAB.…”

Investigation of Kinetic Hydrate Inhibition Using a High Pressure Micro Differential Scanning Calorimeter

“…Several laboratory methods have been developed to analyze the kinetic inhibition of hydrate formation. These include stirred autoclave, rocking cells, flow loop, NMR, and magnetic resonance imaging. − ,− In recent years, high pressure differential scanning calorimetry has become an important tool for investigating the hydrate formation and decomposition (melting) process. , It has proven quite reliable for measuring the dissociation temperature and other time independent properties of hydrates such as the enthalpy of dissociation. Recently, researchers explored that HP-μDSC evoVII can provide statistically reliable time dependent information on hydrate formation and decomposition using temperature ramping and isothermal methods. − In the current study, we used a HP-μDSC evo VII (Setaram, Inc.) and applied straightforward technique based on previous work to investigate kinetic inhibition.…”

Synergism of Ethers on the Kinetic Inhibition Performance of Poly(N-vinyl pyrrolidone) on Methane Hydrate in a Pilot-Scale Flow Loop

“…20 Talaghat confirmed that the kinetic inhibition effects of PVP, L- tyrosine, and modified starch on both of simple and binary gas hydrates could be enhanced by both of PEO and polypropylene oxide in a flow loop. 21,22 The synergy between tetrabutylammonium bromide and PVCap was reported by Chua and Kelland. 23 Kang et al found that ionic liquids could increase the inhibition effects of PVCap on methane hydrate.…”