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One-Dimensional Study on Hydrate Formation from Migrating Dissolved Gas in Sandy Sediments

Author

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  • Nan Li

    (State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
    State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
    These authors contributed equally to this work.)

  • Rezeye Rehemituli

    (State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
    These authors contributed equally to this work.)

  • Jie Zhang

    (State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
    State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China)

  • Changyu Sun

    (State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China)

Abstract

Upward migration of gas-dissolved pore fluid is an important mechanism for many naturally occurring hydrate reservoirs. However, there is limited understanding in this scenario of hydrate formation in sediments. In this preliminary work, hydrate formation and accumulation from dissolved gas in sandy sediments along the migration direction of brine was investigated using a visual hydrate simulator. Visual observation was employed to capture the morphology of hydrates in pores through three sapphire tubes. Meanwhile, the resistivity evolution of sediments was detected to characterize hydrate distribution in sediments. It was observed that hydrates initially formed as a thin film or dispersed crystals and then became a turbid colloidal solution. With hydrate growth, the colloidal solution converted to massive solid hydrates. Electrical resistivity experienced a three-stage evolution process corresponding to the three observed hydrate morphologies. The results of resistivity analysis also indicated that the bottom–up direction of hydrate growth was consistent with the flow direction of brine, and two hydrate accumulation centers successively appeared in the sediments. Hydrates preferentially formed and accumulated in certain depths of the sediments, resulting in heterogeneous hydrate distribution. Even under low saturation, the occurrence of heterogeneous hydrates led to the sharp reduction of sediment permeability.

Suggested Citation

  • Nan Li & Rezeye Rehemituli & Jie Zhang & Changyu Sun, 2020. "One-Dimensional Study on Hydrate Formation from Migrating Dissolved Gas in Sandy Sediments," Energies, MDPI, vol. 13(7), pages 1-13, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:7:p:1570-:d:338662
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    References listed on IDEAS

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