نوع مقاله : مقاله پژوهشی
نویسندگان
1 انستیتو مهندسی نفت- دانشگاه تهران
2 گروه مهندسی نفت پردیس کیش دانشگاه تهران
3 دانشکده مهندسی شیمی دانشگاه تهران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Achieving methane production from a gas hydrate-containing system under safe and economic conditions requires a fundamental understanding of the physical behavior involved in the dynamic process of methane hydrate formation and dissociation in sedimentary environments. In this study, by designing a laboratory apparatus, the kinetics of methane hydrate formation in a silica porous medium with an excess water approach was simulated. Also, using volume balance calculations, the amount of methane conversion fraction during different stages of hydrate formation, as well as the saturation level of phases in hydrate-containing sediments, has been obtained. The results of the temperature and pressure evolution diagrams during the methane hydrate formation process showed that the conditions for hydrate formation for the laboratory samples fully corresponded to the prevailing thermodynamic conditions. In proportion to the selected silica sand grain size, the average saturation of the hydrate phase was 32.5%, the saturation of the water phase was 63.9%, and the saturation of the gas phase was 3.6% for the laboratory samples. Also, the average fraction of methane conversion to hydrate for the test samples was 88.2%. The difference in the thermal responses of the system in some positions of the thermocouples was attributed to the non-uniform distribution and formation of methane hydrate in the porous medium. Also, our study showed that the amount of access of the gas and water phases and the type of distribution of the hydrate phase in the sedimentary environment are important factors controlling the fraction of methane conversion in the test samples. Finally, the simulation of the temperature and pressure conditions of the gas hydrate formed in this study was highly consistent with gas hydrate reservoirs in offshore fields.
کلیدواژهها [English]
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