کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
764288 1462906 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A three-dimensional study on the formation and dissociation of methane hydrate in porous sediment by depressurization
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
پیش نمایش صفحه اول مقاله
A three-dimensional study on the formation and dissociation of methane hydrate in porous sediment by depressurization
چکیده انگلیسی

A middle-scale reactor equipped with 16 thermocouples was used to investigate the formation and dissociation of methane hydrate in sediment in three dimensions. A method was proposed to form hydrate homogeneously distributed in sediment, i.e., using frozen sand instead of wet sand with pore water. With the formed hydrate sample, hydrate dissociation experiment by depressurization was carried out at a constant pressure of 1.0 MPa. It was found that gas hydrate dissociation occurs throughout the hydrate zone, which controlled by both mass transfer and heat transfer throughout the stages. The sharp-interface is hardly found during the hydrate dissociation. The thermal buffering was observed at the temperature of (271.5–272.2) K during the hydrate dissociation process. The ice arisen from hydrate dissociation slows the hydrate dissociation rate below the ice point, which will affect gas production rate. It may be more reasonable that the depressurization method is used in the initial stage and the thermal stimulation method is used in the later stage in the process of gas recovery from hydrate reservoir.


► A method to synthesize typical hydrate-bearing samples is proposed.
► Hydrate dissociation in three-dimensional cell occurs throughout the hydrate zone.
► The sharp interface is hardly found during hydrate depressurization dissociation.
► Hydrate dissociation rates at different locations are not uniform.
► Thermal buffering and heat transfer influence on gas production rate of hydrate.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy Conversion and Management - Volume 56, April 2012, Pages 1–7
نویسندگان
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