Date

2021-9-10

Author

Engüçlü, Hasan Hüseyin

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In this study, temperature, pressure and mole values of methane hydrate formation and dissociation are analyzed using different production methods under laboratory conditions. During the experiments, a cylindrical high-pressure hydrate cell in a constant temperature room was used. In order to provide the real field conditions of the hydrate reservoirs, methane gas was injected at high pressure into the cell filled with sand and water at low temperatures, and the hydrate reservoir was formed in a 21.2 *liter hydrate formation cell by providing necessary thermodynamic conditions. A ¼ inch production line was used for production of methane and water in 3 different experiments. Production phase of the first two experiments were not discussed due to discrepancies arising from the production data. Two different production stages were applied in the third experiment. The first stage was carried out by combination of pressure reduction and thermal recovery method by providing constant temperature water circulation through the spiral pipe inside the cell. The thermal recovery method’s effect decreased and disappeared in the second stage. It left its place only to the depressurization method. As a result of the endothermic dissociation process of the production stage, the heat taken from the environment caused pores to be clogged due to reformation of the hydrate. This slowed down the production and made it stop from time to time. Using the depressurization method with the thermal recovery method, hydrate production became more effective and the hydrate dissociation rate increased. Depressurization method alone became less effective and the rate of dissociation decreased.

Subject Keywords

Gas Hydrate Formation, Gas Hydrate Dissociation, Gas Hydrate Production Mechanisms, Depressurization, Thermal Recovery

URI

https://hdl.handle.net/11511/93202

Collections

Graduate School of Natural and Applied Sciences, Thesis