A Numerical Study on Flow Assurance of Methane Hydrate Production Systems

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  • SHIMIZU Yoshiyuki
    School of Marine Science & Technology, Tokai University
  • MORIKAWA Takahito
    Graduate Schools, Course of Marine Science, Tokai University
  • KIYONO Fumio
    Hydro-environmental Technology Research Group, Advanced Industrial Science and Technology
  • NARITA Hideo
    Methane Hydrate Research Center, Advanced Industrial Science and Technology

Bibliographic Information

Other Title
  • メタンハイドレート資源開発における坑井内流動障害に関する数値計算
  • メタンハイドレート資源開発における坑井内流動障害に関する数値計算 : 相変化を考慮した個別要素法による粗流体格子粒子-熱流体連成モデルの開発
  • メタンハイドレート シゲン カイハツ ニ オケル コウセイ ナイ リュウドウ ショウガイ ニ カンスル スウチ ケイサン : ソウヘンカ オ コウリョ シタ コベツ ヨウソホウ ニ ヨル ソリュウタイ ゴウシ リュウシ-ネツ リュウタイレンセイモデル ノ カイハツ
  • Coarse Grid Thermal-Fluid Coupling Scheme in Discrete Element Method with Phase Change Algorithm
  • 相変化を考慮した個別要素法による粗流体格子粒子－熱流体連成モデルの開発

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Abstract

A new algorithm is implemented to represent formation and decomposition of methane hydrate particles during operation of the production system in the Discrete Element Method with the Coarse Grid Thermal-Fluid Coupling Scheme, which is developed by one of the authors. The phase of discrete particles changes at interface between the particles and continuous phase. The phase-change rate depends on the fugacity from the Pressure-Temperature diagram around the circumstance. The scheme is also enable one to simulate the process of agglomeration from hydrate particles and bonding to equipments of the production system by devising a bonding model. Several simulations were conducted to verify the scheme on the momentum and the thermal energy exchange between particles and continuous phase. Also parametric studies are conducted to examine the algorithm of phase-change by changing phase-change rate constant and the Pressure-Temperature diagram. Further, particles agglomeration in a duct is expressed using the bonding model. It was verified that the momentum and the thermal energy between particles and continuous phase are exchanged correctly with phase-change. Also the scheme was able to represent phase-change of methane hydrate and particle agglomeration. As a result, it was found that the scheme is able to be a useful tool to examine the flow assurance without blockage by methane hydrate in the production system if the parameters used in simulations are tuned up.

Journal

  • Journal of MMIJ

    Journal of MMIJ 129 (1), 11-20, 2013

    The Mining and Materials Processing Institute of Japan

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