Prediction of gas hydrate formation in the presence of methanol, ethanol, (ethylene, diethylene and triethylene) glycol thermodynamic inhibitors

Vatani, Zoha; Amini, Ghazale; Samadi, Mitra; Fuladgar, Amir Masoud

doi:10.1080/10916466.2018.1465960

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…The effects of injecting pure methanol and mono ethylene glycol on hydrate formation were studied and their best performance was rated for gas flow rates of 500 and 1000 MMscfd with setbacks on operational reasons and cost of these compounds [14]. Machine learning techniques, a new approach as demonstrated by [15], have been employed to predict hydrate dissociation temperatures based on precursor compounds and inhibitors. Most work done on hydrate formation prevention did not explore the optimum dosage to prevent hydrate formation.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Optimum Hydrate Inhibitors Mass Percent for Hydrate Formation Prevention

Kinate,

Igwe,

Elikee

2023

Journal of Earth Energy Science, Engineering, and Technology

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The production tubing and pipeline have the critical task of transporting economically significant fluids. As a result, they must be meticulously designed to manage potential issues like gas hydrate formation that can lead to blockage of the pipeline. In this study, the OLGA dynamic multiphase simulator and Multiflash were employed to determine the optimum mass percentages of thermodynamic inhibitors- namely, methanol, monoethylene glycol (MEG), diethylene glycol (DEG) and triethylene glycol (TEG) that are necessary to prevent hydrate formation within the pipeline. The pipeline model was developed using OLGA and Multiflash to characterised the fluid properties and generate the requisite input files (hydrate and PVT table files) for dynamic multiphase simulation with OLGA. Sensitivity analyses were performed to determine the optimum mass percent of methanol, MEG, DEG, and TEG required to suppress hydrate formation in the pipeline. Different mass percent of 10%, 20% 30%, 40%, 50%, 60%, 70%, 80% and 90% of the four inhibitors were introduced into the pipeline to evaluate their impact on hydrate volume fractions and locations along the pipeline at where hydrate attains thermodynamic stability. Addition of the inhibitors was stopped when the system exhibited conditions of no hydrate volume fraction. Result shows that the optimum mass percent for complete hydrate inhibition was 60% for methanol, 45% for MEG, and 70% for TEG inhibitors in the pipeline. DEG showed reduced hydrate fraction but did not inhibit formation effectively even at 90%. It was observed that as the inhibitor mass percent increases, the hydrate dissociation temperature (the temperature below which the hydrate will form) is reduced for a given pressure. Consequently, Monoethylene glycol (MEG) with an optimal mass percentage of 45% was the most efficient inhibitor for curbing hydrate formation within the given pipeline, surpassing the performance of other inhibitors and offering potential cost saving.

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Section: Introductionmentioning

confidence: 99%

Prediction of Optimum Hydrate Inhibitors Mass Percent for Hydrate Formation Prevention

Kinate,

Igwe,

Elikee

2023

Journal of Earth Energy Science, Engineering, and Technology

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“…In those systems, the occurrence of hydrates can lead to blockages along the flow line. Among the conventional methods for hydrate inhibition, there is the prevention of the occurrence of blockages by altering the thermodynamic equilibrium condition through the addition of thermodynamic inhibitors . Thermodynamic inhibitors of hydrates are usually organic chemical additives, mainly alcohols and glycols.…”

Section: Introductionmentioning

confidence: 99%

“…Among the conventional methods for hydrate inhibition, there is the prevention of the occurrence of blockages by altering the thermodynamic equilibrium condition through the addition of thermodynamic inhibitors. 2 Thermodynamic inhibitors of hydrates are usually organic chemical additives, mainly alcohols and glycols. The presence of inhibitors usually reduces the activity of water in the aqueous phase, which shifts hydrate phase boundaries to higher pressures and lower temperatures without inclusion in the hydrate crystalline strucutre.…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibria Data and Thermodynamic Analysis for Liquid–Hydrate–Vapor (LHV) with High Ethanol Concentrations

et al. 2019

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Significant portions of the oil reserves in Brazil are located in deep or ultradeep waters. Oil production from these reservoirs implies a constant awareness of gas hydrate formation. The petroleum industry uses thermodynamic inhibitors to reduce the temperature and increase the pressure of hydrate formation in order to ensure hydrate-free production. Because ethanol is abundant in Brazil and it also works as a hydrate thermodynamic inhibitor, its use is more common. However, experimental data of hydrate phase equilibria (HPE) at high ethanol concentrations are scarce, and there is a limited characterization of the existing data. This study reports LHV equilibrium data for C2H6 and a mixture of CH4/C2H6 at high ethanol concentrations and compiles the equilibrium data with ethanol from the literature to evaluate their consistency as hydrate-inhibited systems as well as to present a comparison between predictive approaches for hydrates with ethanol. We apply a consistency test with three criteria to characterize all HPE data with ethanol in the literature data. The experimental data were measured for up to 45 wt % of ethanol. The CH4, CO2, and C2H6 hydrate data deviated from the average behavior established by the criteria for 5 and 15, 2 and 5, and 5 wt %, respectively. The C3H8 hydrate data from the literature obeys the average behavior of the test criteria as well as the C2H6 and CH4/C2H6 data measured. All predictions were in general agreement with the experimental data for ethanol concentrations of up to 15 wt %.

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Analysis of processed natural gas injection on hydrate formation in high pressure refrigerated condensate lines

Ahmed,

Abbas,

Jamal

et al. 2024

Heliyon

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Prediction of gas hydrate formation in the presence of methanol, ethanol, (ethylene, diethylene and triethylene) glycol thermodynamic inhibitors

Cited by 6 publications

References 6 publications

Prediction of Optimum Hydrate Inhibitors Mass Percent for Hydrate Formation Prevention

Prediction of Optimum Hydrate Inhibitors Mass Percent for Hydrate Formation Prevention

Phase Equilibria Data and Thermodynamic Analysis for Liquid–Hydrate–Vapor (LHV) with High Ethanol Concentrations

Analysis of processed natural gas injection on hydrate formation in high pressure refrigerated condensate lines

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