Research of Formation and Decomposition Processes of Natural Gas Hydrates of Different Composition in Model Stratum Waters of a Bicarbonate-Sodium Type

Research of Formation and Decomposition Processes of Natural Gas Hydrates of Different Composition in Model Stratum Waters of a Bicarbonate-Sodium Type

Natural gas

Gas hydrates

Hydration

Gases

Natural gas fields

Gas condensates

Physicochemical properties

Carbonates

Sodium bicarbonate

The paper presents the results of an experimental study of the behaviour of formation and decomposition of natural gas hydrates of the Srednevilyuiskoe and Otradninskoe gas condensate fields depending on the concentration of sodium bicarbonate solution. Natural gases used in the hydrate formation process differ in their component composition and physicochemical properties. It was found that with increasing concentration of solutions, the gas pressure at which the hydrate formation process ends is increased. During hydrate formation, the initial dry natural gas of the Srednevilyuiskoe field turns into semi-wet gas, and that of the Otradninskoe field turns into wet gas. The decomposition of natural gas hydrates is described by sigmoid curves without an induction period. For the decomposition reaction of hydrates formed by natural gas of the Srednevilyuiskoe field, the reaction acceleration period is shorter than the deceleration period, while the opposite is observed for the Otradninskoe field. Therefore, in the first case, hydrates decompose faster than in the second. Thus, it was found that the hydrate formation process in model solutions of the sodium bicarbonate type and the decomposition reaction of the resulting hydrates depend on the composition of natural gas. 2020 Published under licence by IOP Publishing Ltd.

459

2019 International Science and Technology Conference on Earth Science, ISTCEarthScience 2019, December 10, 2019 - December 12, 2019

2020

Kalacheva, L.P.

Portnyagin, A.S.

Solovyeva, S.A.

conferencePaper

17551307

10.1088/1755-1315/459/5/052069