Experimental study of hydrogen sulfide hydrate formation: Induction time in the presence and absence of kinetic inhibitor

Salamat, Yousef; Moghadassi, Abdolreza; Illbeigi, Mohammad; Eslamimanesh, Ali; Mohammadi, Amir H.

doi:10.1016/s2095-4956(13)60015-7

Cited by 30 publications

(27 citation statements)

References 15 publications

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“…The error range of the induction time and the supercooling degree is within AE0.1 h and AE0.3 C, respectively. According to the conclusions of Villano et al 27 and Salamat et al, 28 large volume reactor can reduce the stochasticity of the induction time, probably due to existence of more locations for hydrate nucleation. Therefore, the repeatability of our experimental results is likely due to the large volume (250 L) of our ow loop.…”

Section: Resultsmentioning

confidence: 95%

Study of hydrate formation in gas-emulsion multiphase flow systems

et al. 2017

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Section: Resultsmentioning

confidence: 95%

Study of hydrate formation in gas-emulsion multiphase flow systems

et al. 2017

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“…They increase hydrate formation induction time and decrease hydrate nucleation and crystal growth rates. The well-known KHIs are polyvinylpyrrolidone (PVP) and polyvinylcaprolactam (PVCap) (Sloan and Koh 2008;Daraboina et al 2011Daraboina et al , 2013Kelland 2006;Salamat et al 2013;Villano et al 2009;Rasoolzadeh et al 2016;Cha et al 2013;Kakati et al 2016). THIs are normally used in large quantities even up to 50 wt% but in some specific cases, injecting THIs in large quantities has an insufficient impact on gas hydrate formation because the conditions are very convenient for gas hydrates to form.…”

Section: Introductionmentioning

confidence: 99%

“…In these cases, KHIs can be used to delay formation of gas hydrates, as mentioned earlier (Sloan and Koh 2008). One can define the induction time as an interval between reaching hydrate formation conditions and occurring hydrate formation (Sloan and Koh 2008;Daraboina et al 2011;Daraboina et al 2013;Kelland 2006;Salamat et al 2013;Villano et al 2009;Rasoolzadeh et al 2016;Cha et al 2013;Kakati et al 2016). In the past decade, the focus of scientific investigations was on the new group of inhibitors like some kinds of ionic liquids (ILs) that not only shift hydrate phase equilibrium curve to lower temperature/higher pressure regions but also increase hydrate formation induction time.…”

Section: Introductionmentioning

confidence: 99%

Insights into kinetic inhibition effects of MEG, PVP, and L-tyrosine aqueous solutions on natural gas hydrate formation

et al. 2020

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It is necessary to understand all the prerequisites, which result in gas hydrate formation for safe design and control of a variety of processes in petroleum industry. Thermodynamic hydrate inhibitors (THIs) are normally used to preclude gas hydrate formation by shifting hydrate stability region to lower temperatures and higher pressures. Sometimes, it is difficult to avoid hydrate formation and hydrates will form anyway. In this situation, kinetic hydrate inhibitors (KHIs) can be used to postpone formation of gas hydrates by retarding hydrate nucleation and growth rate. In this study, two kinetic parameters including natural gas hydrate formation induction time and the rate of gas consumption were experimentally investigated in the presence of monoethylene glycol (MEG), L-tyrosine, and polyvinylpyrrolidone (PVP) at various concentrations in aqueous solutions. Since hydrate formation is a stochastic phenomenon, the repeatability of each kinetic parameter was evaluated several times and the average values for the hydrate formation induction times and the rates of gas consumption are reported. The results indicate that from the view point of hydrate formation induction time, 2 wt% PVP and 20 wt% MEG aqueous solutions have the highest values and are the best choices. It is also interpreted from the results that from the view point of the rate of gas consumption, 20 wt% MEG aqueous solution yields the lowest value and is the best choice. Finally, it is concluded that the combination of PVP and MEG in an aqueous solution has a simultaneous synergistic impact on natural gas hydrate formation induction time and the rate of gas consumption. Furthermore, a semi-empirical model based on chemical kinetic theory is applied to evaluate the hydrate formation induction time data. A good agreement between the experimental and calculated hydrate formation induction time data is observed.

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“…Moreover, the design of a new field development with LDHI technology can provide large cost savings. 1,[6][7][8][9][10] KHIs are water-soluble polymers that can delay either hydrate nucleation or hydrate growth. 11 The interference slows down the kinetics and then extends the induction time for hydrate formation.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the performance of low-dosage hydrate inhibitors combined with wax inhibitors for a mixed CH₄-CO₂ gas hydrate formation

Lang

et al. 2015

Can. J. Chem.

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Within the oil and gas industry, low-dosage hydrate inhibitors (LDHIs) are a proven technology to control hydrates. Besides hydrate inhibitors, wax inhibitors (WIs) are frequently injected to prevent wax buildup in the crude oil pipeline. However, little attention has been focused on the effect of wax inhibitors on the performance of LDHIs. In this study, performance tests of 3 LDHIs in the presence of wax inhibitors were carried out for a 67% CH 4 /33% CO 2 gas hydrate formation. Using the isothermal cooling method at pressures of 9 MPa and temperatures of 4°C (subcooling is 9°C), the results showed that the induction time of CH 4 -CO 2 gas hydrate formation with LDHI/WI was shorter than the system with only LDHI. During the growth period, when the concentration of the WIs was 1 mass%, the growth time of the system with LDHI/WI was prolonged. Taking the induction time and the growth time into consideration, it was found that WIs had a more negative impact on the kinetic hydrate inhibitor performance at low dosage. The effect of WIs at high concentration could be negligible.Résumé : Au sein de l'industrie pétrolière, l'utilisation d'inhibiteurs d'hydrates à faible dose est un moyen reconnu pour maîtriser la formation d'hydrates. Outre les inhibiteurs d'hydrates, des inhibiteurs de cire sont couramment injectés pour prévenir la formation de cire durant le transport du pétrole brut dans les pipelines. Toutefois, les effets des inhibiteurs de cire sur le rendement des inhibiteurs d'hydrates à faible dose ont peu été étudiés. Dans la présente étude, à l'aide d'une méthode de refroidissement isotherme, à une pression de 9 MPa et une température de 4°C (température de sous-refroidissement de 9°C), nous avons évalué le rendement de trois inhibiteurs d'hydrates à faible dose en présence d'inhibiteurs de cire dans des essais portant sur la formation d'hydrates de gaz composés à 67 % de méthane (CH 4 ) et 33 % de dioxyde de carbone (CO 2 ). Les résultats ont révélé que la période d'induction de la formation des hydrates de CH 4 et CO 2 en présence des deux types d'inhibiteurs était plus courte que dans le système comportant seulement un inhibiteur d'hydrates à faible dose. Au cours de la période de croissance, lorsque la concentration de l'inhibiteur de cire représentait 1 % p/p, la période de croissance dans le système en présence des deux types d'inhibiteurs était prolongée. En prenant en compte les périodes d'induction et de croissance, nous avons constaté que les inhibiteurs de cire avaient des effets plus délétères sur le rendement des inhibiteurs cinétiques lorsque ceux-ci étaient utilisés à faible dose, alors qu'à concentration élevée, l'effet des inhibiteurs de cire pourrait être négligeable. [Traduit par la Rédaction]Mots-clés : hydrate de gaz, inhibiteur d'hydrates à faible dose, inhibiteur de cire, gaz enrichi en CO 2 , période d'induction.

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Experimental study of hydrogen sulfide hydrate formation: Induction time in the presence and absence of kinetic inhibitor

Cited by 30 publications

References 15 publications

Study of hydrate formation in gas-emulsion multiphase flow systems

Study of hydrate formation in gas-emulsion multiphase flow systems

Insights into kinetic inhibition effects of MEG, PVP, and L-tyrosine aqueous solutions on natural gas hydrate formation

Investigation of the performance of low-dosage hydrate inhibitors combined with wax inhibitors for a mixed CH₄-CO₂ gas hydrate formation

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Experimental study of hydrogen sulfide hydrate formation: Induction time in the presence and absence of kinetic inhibitor

Cited by 30 publications

References 15 publications

Study of hydrate formation in gas-emulsion multiphase flow systems

Study of hydrate formation in gas-emulsion multiphase flow systems

Insights into kinetic inhibition effects of MEG, PVP, and L-tyrosine aqueous solutions on natural gas hydrate formation

Investigation of the performance of low-dosage hydrate inhibitors combined with wax inhibitors for a mixed CH4-CO2 gas hydrate formation

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Investigation of the performance of low-dosage hydrate inhibitors combined with wax inhibitors for a mixed CH₄-CO₂ gas hydrate formation