Is subcooling the right driving force for testing low-dosage hydrate inhibitors?

Arjmandi, Mosayyeb; Tohidi, Bahman; Danesh, Ali; Todd, Adrian Christopher

doi:10.1016/j.ces.2004.10.005

Cited by 157 publications

(102 citation statements)

References 14 publications

(18 reference statements)

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“…In general, thermodynamic inhibitors or low dosage hydrate inhibitors, such as kinetic inhibitors (KIs) and anti-agglomerants (AAs) [1][2][3][4], are injected to inhibit or control the formation of hydrates. On the other hand, hydrate slurry might become an alternative approach for oil and gas transportation, as large amounts of natural gas can be stored in the form of hydrates.…”

Section: Introductionmentioning

confidence: 99%

Hydrate Formation/Dissociation in (Natural Gas + Water + Diesel Oil) Emulsion Systems

et al. 2013

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Abstract:Hydrate formation/dissociation of natural gas in (diesel oil + water) emulsion systems containing 3 wt% anti-agglomerant were performed for five water cuts: 5, 10, 15, 20, and 25 vol%. The natural gas solubilities in the emulsion systems were also examined. The experimental results showed that the solubility of natural gas in emulsion systems increases almost linearly with the increase of pressure, and decreases with the increase of water cut. There exists an initial slow hydrate formation stage for systems with lower water cut, while rapid hydrate formation takes place and the process of the gas-liquid dissolution equilibrium at higher water cut does not appear in the pressure curve. The gas consumption amount due to hydrate formation at high water cut is significantly higher than that at low water cut. Fractional distillation for natural gas components also exists during the hydrate formation process. The experiments on hydrate dissociation showed that the dissociation rate and the amount of dissociated gas increase with the increase of water cut. The variations of temperature in the process of natural gas hydrate formation and dissociation in emulsion systems were also examined.

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Section: Introductionmentioning

confidence: 99%

Hydrate Formation/Dissociation in (Natural Gas + Water + Diesel Oil) Emulsion Systems

et al. 2013

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“…It has been accepted that hydrate formation is a kinetic process consisting of nucleation and growth (Kashchiev and Firoozabadi, 2002;Englezos et al, 1987aEnglezos et al, , 1987b. Induction time is usually measured and used as one of the two main criteria besides subcooling to evaluate the performance of kinetic hydrate inhibitors (Natarajan et al, 1994;Makogon and Holditch, 2001;Sloan et al, 1998;Arjmandi et al, 2005). A theoretical study on induction time of gas hydrate crystallization by Kashchiev and Firoozabadi (2003) suggested that, under a certain degree of subcooling, an ideal kinetic inhibitor should provide a long induction time by adsorbing on both nucleation sites and growth sites.…”

Section: Introductionmentioning

confidence: 99%

Characterization of inhibition mechanisms of kinetic hydrate inhibitors using ultrasonic test technique

Yang

Tohidi

2011

Chemical Engineering Science

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“…4). Arjmandi et al [30] observeded no significant effect of change of the system pressure on induction time at a constant degree of subcooling. Yousif [31] reported the results of the tests conducted on natural gas-water system.…”

Section: Measurement Of Induction Timementioning

confidence: 97%

“…Subcooling [30] is calculated as the difference between hydrate dissociation temperature (T diss ) and formation temperature (T) at system operating pressure.…”

Section: Measurement Of Induction Timementioning

confidence: 99%

Methane Hydrate Formation and Dissociation in the presence of Bentonite Clay Suspension

et al. 2013

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The present work reports the effect of bentonite clay on methane hydrate formation and dissociation in synthetic seawater of salinity 3.55 % of total dissolved salts. Extensive observations of pressure-temperature equilibrium during formation and decomposition of methane hydrate under different conditions have been made. It is observed that phase equilibrium conditions of hydrate are affected on changing the concentration of bentonite clay in synthetic seawater. Induction time for hydrate nucleation has been measured under different concentrations of clay and subcooling conditions. The presence of bentonite clay in synthetic seawater reduces the induction time of hydrate formation. Enthalpy of hydrate dissociation is calculated by Clausius-Clapeyron equation using measured phase equilibrium data. The amount of gas consumed during hydrate formation has been calculated using real gas equation. It is found that a larger amount of gas is consumed upon addition of bentonite clay in synthetic seawater.

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Is subcooling the right driving force for testing low-dosage hydrate inhibitors?

Cited by 157 publications

References 14 publications

Hydrate Formation/Dissociation in (Natural Gas + Water + Diesel Oil) Emulsion Systems

Hydrate Formation/Dissociation in (Natural Gas + Water + Diesel Oil) Emulsion Systems

Characterization of inhibition mechanisms of kinetic hydrate inhibitors using ultrasonic test technique

Methane Hydrate Formation and Dissociation in the presence of Bentonite Clay Suspension

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