Effect of alcohols and diols on PVCap-induced hydrate crystal growth patterns in methane systems

Mozaffar, Houra; Anderson, Ross; Tohidi, Bahman

doi:10.1016/j.fluid.2016.05.005

Cited by 54 publications

(62 citation statements)

References 8 publications

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“…This specific behaviour can be observed in Figure for inhibitor C (green markers) on the subcooling range of 0.5‐2.5 K. In this range, the observed growth rates of the inhibited systems are greater or equal than those of the uninhibited system (orange markers). This inhibitor contains methanol (Table ) which has been observed to reduce the subcoolings at which complete crystal growth inhibition occurs in PVCap inhibited systems . Nonetheless, it is unclear if this behaviour can be attributed to the presence of methanol since the exact nature of the polymers present in inhibitor C is unknown.…”

Section: Resultsmentioning

confidence: 99%

Assessment of commercial hydrate inhibitors using the 3‐in‐1 method

et al. 2019

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Phase equilibria, kinetics, and morphology studies of gas hydrates require separate pieces of equipment and experimentation times in the order of days. Recently, we designed a reactor that allows for tight control of the crystallization temperature. Coupled with a novel method, this reactor can screen the crystal morphology, phase equilibria, and apparent kinetics of gas hydrates. Compared to traditional multi‐trial methods, the main advantage of this method is that only a single experiment, completed in the order of hours, is required to assess: (a) the change in hydrate growth velocity with respect to temperature, (b) the HLV equilibrium temperature at the experimental pressure, and (c) the change in crystal morphology with respect to driving force. Using this 3‐in‐1 method, methane hydrate growth and dissociation was studied in the presence of four commercial inhibitors. Phase equilibria, kinetics, and morphology were obtained for all hydrate systems with inhibitors. The standard uncertainty for the HLV equilibrium temperature was 0.05 K and for pressure 0.005 MPa. The apparent rates of growth were measured for all systems (standard uncertainty was 0.008 mm · s−1) and the difference between the inhibited systems and the pure system was very clear. Crystal habits varied considerably among inhibitors and radically with respect to the uninhibited system. Overall, we present an innovative technology to assess the morphology, kinetics, and thermodynamics of hydrate forming systems with a single apparatus. Furthermore, with little time investment, small sample sizes can be used to obtain replicates with minimum temperature and pressure uncertainties.

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Section: Resultsmentioning

confidence: 99%

Assessment of commercial hydrate inhibitors using the 3‐in‐1 method

et al. 2019

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“…Closely related to induction time data and complementary to this, CGI regions are readily measureable using conventional hydrate laboratory equipment, with subcooling extents − which it is speculated are polymer surface absorption related phenomena − providing a means to assess KHIs more rapidly and robustly, while giving increased confidence in performance under worst case scenario (hydrate present) field conditions. This CGI method is now being increasingly used for field evaluation studies by major operators [Glénat et al, 2011;Glénat et al, 2013;Luna-Ortiz et al, 2014] and can aid in developing new inhibition strategies such as KHI-MEG combinations [Mozaffar et al, 2016].…”

Section: Khi Backgroundmentioning

confidence: 99%

“…This could adversely affect the economics of field development and/or reduce the ultimate recovery factor. In such scenarios, the combination of TI + KHI could be a very attractive option which can reduce the amount of TI by 20-40 wt% based on case studies conducted by Hydrafact and experimental work at Heriot-Watt University [Mozaffar et al, 2016].…”

Section: Khi Fouling Problemsmentioning

confidence: 99%

“…Initial tests on other KHI polymers/formulations have shown some success, however so far it has been found to be most effective with PVCap-type chemistry. Given that MEG and PVCap show excellent synergism with respect to kinetic hydrate inhibition, with small fractions of PVCap (0.5 to 1.0 wt%) offering the equivalent inhibition of 10's of wt% MEG Mozaffar et al, 2016], the method opens up particular opportunities in this area.…”

Section: Khi Removal Studiesmentioning

confidence: 99%

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Kinetic hydrate inhibitor removal from produced waters by solvent extraction

Anderson

Tohidi

Mozaffar

et al. 2016

Journal of Petroleum Science and Engineering

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“…Some surfactants are used to slow or prevent hydrate formation in oilfields. On the other hand, some surfactants are used to http://echemcom.com Original Research Article promote hydrate formation in most hydrate-based technologies [14][15][16]. In this work the interfacial tension between carbon dioxide hydrate and water in presence of SDS and TBAB has been determined through measuring the induction time in carbon dioxide hydrate crystallization.…”

Section: Introductionmentioning

confidence: 99%

Effect of TBAB and SDS surfactants on the interfacial tension of CO2 Hydrate in water

2020

Eurasian Chem. Commun.

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The interfacial tension rate is an important factor in the kinetic study of gas hydrate formation. In this study, the interfacial tension between CO2 hydrate and water was calculated at various temperatures, pressures and solution concentrations through measuring the induction time according to the Classical Nucleation Theory (CNT). Since the nucleation of hydrate is in part an interfacial phenomenon, interfacial properties such as the interfacial tension between gas and water may have a great influence upon the hydrate formation rate. Experimental data for pure water showed that, at constant temperature, with increasing pressure, the interfacial tension decreases from 2.92 to 1.67 mN/m, and at constant pressure with increasing temperature, interfacial tension increases from 3.92 to 4.7 mN/m. At constant temperature, with increasing TBAB concentration from 1% to 3% by weight, the induction time decreases from 60 to 36 seconds. At higher temperatures, addition of SDS 500 ppm decreased the induction time and interfacial tension from 4.61 to 2.32 m N/m. Finally, the relationship of nucleation intensity with the super saturation was obtained by fitting the experimental data. According to equations and graphs, the nucleation intensity is a function of temperature.

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Effect of alcohols and diols on PVCap-induced hydrate crystal growth patterns in methane systems

Cited by 54 publications

References 8 publications

Assessment of commercial hydrate inhibitors using the 3‐in‐1 method

Assessment of commercial hydrate inhibitors using the 3‐in‐1 method

Kinetic hydrate inhibitor removal from produced waters by solvent extraction

Effect of TBAB and SDS surfactants on the interfacial tension of CO2 Hydrate in water

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