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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

TEMPERATURE CHANGES FOR METHANE HYDRATE DISSOCIATION IN DIFFERENT CLASS DEPOSITS BY DEPRESSURIZATION

Get access (open in a dialog) DOI: 10.1615/IHTC16.nee.023237
pages 7477-7483

Аннотация

There are mainly four classes methane hydrates deposits in nature. Their differences are the distribution of methane hydrates, free gas and free water layers. The four class deposits have different temperature distribution during dissociation. And the temperature changes influenced the ice formation and the reformation of methane hydrates. The phenomenon was associated with wellbore plugging during real methane exploitation. Besides, the temperature changes influenced the gas production rate. So it was very important to know how the temperature changed and the effect of heat transfer for different type methane hydrates deposits during dissociation. A high-pressure reactor which had 17 thermocouple points were used and BZ01 glass beads were used to simulate porous media to show the methane hydrates formation and dissociation in the experiments. The experiments applied different sand-filling methods to simulate 3 class methane hydrates deposits. It was found that there was little influence of different class sample on temperature when the backpressure was 3.0 MPa. However, when the backpressure was 2.3 MPa and 2.6 MPa, Class 3 samples' temperature decreased by a maximum value and Class 2 samples' temperature decreased by a minimum value during depressurization. This study provided basic temperature changes data for different class deposits dissociation by depressurization.