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A Long Gravity-Piston Corer Developed for Seafloor Gas Hydrate Coring Utilizing an In Situ Pressure-Retained Method

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  • Jia-Wang Chen

    (Ocean College, Zhejiang University, Hangzhou 310058, China
    Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, HI 96822, USA)

  • Wei Fan

    (Department of Ocean Engineering, Hangzhou Dianzi University, Hangzhou 310018, China)

  • Brian Bingham

    (Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, HI 96822, USA)

  • Ying Chen

    (Ocean College, Zhejiang University, Hangzhou 310058, China
    State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China)

  • Lin-Yi Gu

    (State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China)

  • Shi-Lun Li

    (State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China)

Abstract

A corer, which can obtain long in situ pressure-retained sediments of up to 30 m core containing gas hydrates, has been applied in the South China Sea (SCS) dozens of times. The corer presented in this paper is a convenient, efficient and economical long in situ pressure-retained coring and research tool for submarine sediments, that can applied to completely cope with all sediments close to the seafloor ranging from shallow waters to the deep sea depths of 6000 m. This article mainly presents the overall structure, working principles, key pressure-retained components, coring mechanism, sea trials and outlook of the corer. The analyses found that the coring ability was affected by formation characteristics, the outer diameter of the core barrels and inner diameter of the core liners, the shapes of the cutter and the dead weight of the corer. This study can provide the practical basis for the structural optimization of this type of corer and designs for corers with greater penetrability. Sea trials showed that the developed corer presented in this paper can support the in situ pressure of the seafloor sediment core, which is an improvement over the conventional piston corer.

Suggested Citation

  • Jia-Wang Chen & Wei Fan & Brian Bingham & Ying Chen & Lin-Yi Gu & Shi-Lun Li, 2013. "A Long Gravity-Piston Corer Developed for Seafloor Gas Hydrate Coring Utilizing an In Situ Pressure-Retained Method," Energies, MDPI, vol. 6(7), pages 1-20, July.
    • Handle: RePEc:gam:jeners:v:6:y:2013:i:7:p:3353-3372:d:27036
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    References listed on IDEAS

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    1. Gerald R. Dickens & Charles K. Paull & Paul Wallace, 1997. "Direct measurement of in situ methane quantities in a large gas-hydrate reservoir," Nature, Nature, vol. 385(6615), pages 426-428, January.
    2. Zhao, Jiafei & Yu, Tao & Song, Yongchen & Liu, Di & Liu, Weiguo & Liu, Yu & Yang, Mingjun & Ruan, Xuke & Li, Yanghui, 2013. "Numerical simulation of gas production from hydrate deposits using a single vertical well by depressurization in the Qilian Mountain permafrost, Qinghai-Tibet Plateau, China," Energy, Elsevier, vol. 52(C), pages 308-319.
    3. Jiafei Zhao & Chuanxiao Cheng & Yongchen Song & Weiguo Liu & Yu Liu & Kaihua Xue & Zihao Zhu & Zhi Yang & Dayong Wang & Mingjun Yang, 2012. "Heat Transfer Analysis of Methane Hydrate Sediment Dissociation in a Closed Reactor by a Thermal Method," Energies, MDPI, vol. 5(5), pages 1-17, May.
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