Modeling of Permeability Characteristics under the Presence of Methane Hydrate and Simulation of a Laboratory Experiment on Hydrate Dissociation-Estimation of Permeability in Methane Hydrate Reservoir, Part4-

DOI Web Site 10 Citations 21 References
  • SAKAMOTO Yasuhide
    National Institute of Advanced Industrial Science and Technology(AIST), Methane Hydrate Research Laboratory
  • KOMAI Takeshi
    National Institute of Advanced Industrial Science and Technology (AIST), Institute for Geo-Resources and Environment, Geo-Environment Analysis and Evaluation Group
  • KAWAMURA Taro
    National Institute of Advanced Industrial Science and Technology(AIST), Methane Hydrate Research Laboratory
  • TENMA Norio
    National Institute of Advanced Industrial Science and Technology (AIST), Institute for Geo-Resources and Environment, Geo-Energy and Environment Research Group
  • YAMAGUCHI Tsutomu
    National Institute of Advanced Industrial Science and Technology (AIST), Methane Hydrate Research Laboratory

Bibliographic Information

Other Title
  • メタンハイドレート存在下での浸透率モデルの構築と室内分解実験のシミュレーション―メタンハイドレート貯留層の浸透率評価に関する研究（第４報）―
  • メタンハイドレート ソンザイ カ デ ノ シントウリツ モデル ノ コウチク ト シツナイ ブンカイ ジッケン ノ シミュレーション メタンハイドレート チョリュウソウ ノ シントウリツ ヒョウカ ニ カンスル ケンキュウ ダイ4ホウ
  • Estimation of Permeability in Methane Hydrate Reservoir, Part4
  • メタンハイドレート貯留層の浸透率評価に関する研究 (第4報)

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Abstract

Methane hydrate (MH) is one of the potential resources of natural gas in the near future, because it exists in marine sediments or in permafrost regions worldwide. To evaluate the productivity of methane gas from MH reservoirs, it is necessary to develop a gas production simulator for doing case studies.<BR>We have carried out an experimental research on MH dissociation process by hot-water injection as one of the thermal recovery methods, for clarifying the physical phenomena of gas-water multiphase flow in porous media and the properties of formation and dissociation of MH. In this study, we developed a new numerical theory for MH dissociation process in porous media, based on the phenomena experimentally observed. In the developed theory, MH phase is treated as two components system derived from irreducible and free water. As MH is not mobile due to its solid characteristics, we consider gas-water two-phase flow with MH formation. We also consider the change in reservoir temperature due to hear transfer, and formation and dissociation of MH. Absolute permeability and relative permeability of sand packs were measured under the presence of MH and models for the permeabilities were formulated as functions of MH saturation, etc. These models can estimate dramatic decrease in absolute permeability at high MH saturations, whereas relative permeability curves are shifted to lower water saturation at high MH saturations.<BR>Using the developed theory, we carried out numerical studies for a laboratory core experiment of MH dissociation by hot-water injection. Simulation results on temperature distribution and gas production behavior during MH dissociation sufficiently agreed with the experimental data. Furthermore, it was found that the simulation was able to reproduce experimental pressure behavior associated with permeability change due to MH formation and dissociation.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 122 (8), 396-405, 2006

    The Mining and Materials Processing Institute of Japan

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