Influence of external factors on the process of hydrates development in laboratory conditions

Nashwan Abdullah, Bohdan Kutnyi

Abstract


The object of research is the influence of various factors on the process of synthesis of propane hydrate in laboratory conditions. It is known that a synthesized gas hydrate can contain a significant amount of ice, which reduces its gas content. The quality of the hydrate is affected by: gas pressure, water temperature, time of the experiment and the concentration of surfactants.

To study the complex effect of these factors on the quality of the hydrate obtained, an experimental setup is developed. After synthesis of the gas hydrate, its gas content is determined using a specially designed stand. In the course of the research, various measuring instruments were used: manometers, thermometers, measuring utensils, electronic scales, etc., which made it possible to obtain reliable information on the thermophysical characteristics of the synthesis and dissociation of gas hydrate.

As a result of the multivariate experiment, an array of data for analysis by mathematical statistics methods is obtained. Correlation coefficients are determined and found that the dominant factors are the gas pressure and concentration of surfactants. The water temperature should be within the operating range of 1–5 °C. The formation time of the hydrate in the bubbling regime within 0.5–5 h also does not significantly affect the quality of the obtained hydrate. For all factors, regression dependencies and graphs are constructed. It is established that for standard regression dependencies (linear, exponential, logarithmic and polynomial), the coefficients of multiple correlation are in the range 0.19–0.46. This means that the standard regression relationships do not allow to take into account all the features of the obtained results. Therefore, the selection of the optimal dependence is carried out by the method of variation of the coefficients and types of functional dependencies and an approximate formula is obtained for determining the predicted gas content of the hydrate.

The research results show that due to the complex consideration of various factors, it is possible to determine the range of optimum values of pressure, temperature and concentration of surfactants, which makes it possible to quickly produce a high-quality hydrate.


Keywords


gas hydrates; gas content of hydrate; external factors; statistical analysis

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References


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GOST Style Citations


Review of unconventional hydrocarbon resources in major energy consuming countries and efforts in realizing natural gas hydrates as a future source of energy / Vedachalam N. et. al. // Journal of Natural Gas Science and Engineering. 2015. Vol. 26. P. 163–175. doi: https://doi.org/10.1016/j.jngse.2015.06.008 

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Trofimchuk A. A., Cherskiy N. V., Carev V. P. Gidraty – noviy istochnik uglevodorodov // Priroda. 1979. Issue 1. P. 83–88.

Methane Production from Gas Hydrate Deposits through Injection of Supercritical CO2 / Deusner C. et. al. // Energies. 2012. Vol. 5, Issue 7. P. 2112–2140. doi: https://doi.org/10.3390/en5072112 

Oveckiy S., Savchuk V. A Method Developed to Increase Technological and Ecological Efficiency of Gas Production from Hydrate Deposits // Eastern-European Journal of Enterprise Technologies. 2016. Vol. 3, Issue 10 (81). P. 41–47. doi: https://doi.org/10.15587/1729-4061.2016.72545 

Energy-efficient methods for production methane from natural gas hydrates / Chen J. et. al. // Journal of Energy Chemistry. 2015. Vol. 24, Issue 5. P. 552–558. doi: https://doi.org/10.1016/j.jechem.2015.08.014 

Shiryaev E. V. Metody bor'by s gidratoobrazovaniem i vybor ingibitora gidratoobrazovaniya pri obustroystve gazovogo mestorozhdeniya «Kamennomysskoe more» // Molodoy ucheniy. 2015. Issue 17. P. 323–326.

Pavlenko А., Kutnyi B., Holik Y. Study of the effect of thermobaric conditions on the process of formation of propane hydrate // Eastern-European Journal of Enterprise Technologies. 2017. Vol. 5, Issue 5 (89). P. 43–50. doi: https://doi.org/10.15587/1729-4061.2017.111409 

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Baba Babanli M., Shumska L., Leshchenko M. Heat Treatment Technology of Porous Building Materials with Predictability of Thermophysical Properties // International Journal of Engineering & Technology. 2018. Vol. 7, Issue 3.2. P. 501–509. doi: https://doi.org/10.14419/ijet.v7i3.2.14579 





DOI: https://doi.org/10.15587/2312-8372.2018.141302



Copyright (c) 2018 Nashwan Abdullah, Bohdan Kutnyi

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ISSN (print) 2226-3780, ISSN (on-line) 2312-8372