Hydrate formation studies to improve the reliability of natural gas production and transport under the conditions of cryolithozone
https://doi.org/10.31242/2618-9712-2021-26-1-5
Abstract
The results of assessing the possibility of hydrate formation in the bottomhole zone of gas wells and modeling of gas flow in wells taking into account the possible hydrate formation are presented. The obtained results are especially relevant for regions where gas production is complicated by the presence of permafrost, i.e. by low reservoir temperatures. Due to inevitable gas cooling during its production, the formation of gas hydrates is possible both in bottomhole zones and in wellbores. A reliable forecast of hydrate formation in the bottomhole zone is possible only within the framework of a non-isothermal model of real gas filtration. In the mathematical model of hydrate formation in pipes, account of the dependence of convective heat transfer coefficients and hydraulic resistance on the pipe flow area varying with time leads to an increase in the duration of complete blockage with hydrates. The influence of mineralization of various genetic types of stratum waters on the formation of natural gas hydrates in the volume and in a porous medium was studied. It was established that C2–C4 hydrocarbons get concentrated in the hydrate phase, which leads to an increase in the fat coefficient and the calorific value of initial gas. The thermodynamic conditions of hydrate formation in dispersed rocks are determined taking into account the salinity of stratum waters.
Keywords
gas hydrate,
natural gas,
stratum water,
fat coefficient and calorific value of gas,
gas production and transportation,
mathematical modeling,
laboratory experiment
Supporting agencies: The work was carried out under the State Assignment of the Ministry of Science and Higher Education of the Russian Federation No. АААА-А21-121011490056-4.
About the Authors
I. I. Rozhin
Institute of Oil and Gas Problems SB RAS
Russian Federation
Russian Federation
ROZHIN Igor Ivanovich, Dr. Sci. (Engineering), assistant professor, chief researcher
1 Oktyabrskaya st., Yakutsk 677980
Researcher ID F-1008-2014
L. P. Kalacheva
Institute of Oil and Gas Problems SB RAS
Russian Federation
Russian Federation
KALACHEVA Liudmila Petrovna, Cand. Sci (Chemistry), leading researcher
1 Oktyabrskaya st., Yakutsk 677980
Researcher ID I-8374-2018
I. K. Ivanova
Institute of Oil and Gas Problems SB RAS
Russian Federation
Russian Federation
IVANOVA Izabella Karlovna, Cand. Sci (Chemistry), assistant professor, leading researcher
1 Oktyabrskaya st., Yakutsk 677980
Researcher ID K-7120-2017
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Review
For citations:
Rozhin I.I., Kalacheva L.P., Ivanova I.K. Hydrate formation studies to improve the reliability of natural gas production and transport under the conditions of cryolithozone. Arctic and Subarctic Natural Resources. 2021;26(1):49-59. (In Russ.) https://doi.org/10.31242/2618-9712-2021-26-1-5
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