Numerical prediction of seabed subsidence with gas production from offshore methane hydrates by hot-water injection method

Hiroki Matsuda, Takafumi Yamakawa, Kyuro Sasaki, Yuichi Sugai

Research output: Contribution to journalArticle

Abstract

Seabed subsidence is studied by comparing experimental data with the results of a numerical model for gas production from an offshore methane hydrate (MH) reservoir using the hot-water injection method. To predict seafloor displacement, geo-mechanical reservoir models, such as the consolidation– permeability compound model, are required to simulate MH dissociation and consolidation by depressurization in the MH reservoir. In this study, we constructed a field-scale model of gas production from a MH reservoir induced by hot-water injection using dual horizontal wells. Compared with the depressurization method, this method required less depressurization to produce the same amount of gas with pressure drawdown up to 10MPa. This causes less seabed subsidence; therefore, the hot-water injection method is a more environmentally friendly gas-production method for offshore MH reservoirs.
Original languageEnglish
Pages (from-to)18
Number of pages31
JournalInternational Journal of Petroleum and Petrochemical Engineering
Volume4
Issue number1
DOIs
Publication statusPublished - Jan 2018

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Water injection
Subsidence
Hydrates
gas production
Methane
subsidence
methane
prediction
Gases
Consolidation
consolidation
Horizontal wells
drawdown
Numerical models
seafloor
hot water
method
permeability
well
gas

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology

Cite this

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abstract = "Seabed subsidence is studied by comparing experimental data with the results of a numerical model for gas production from an offshore methane hydrate (MH) reservoir using the hot-water injection method. To predict seafloor displacement, geo-mechanical reservoir models, such as the consolidation– permeability compound model, are required to simulate MH dissociation and consolidation by depressurization in the MH reservoir. In this study, we constructed a field-scale model of gas production from a MH reservoir induced by hot-water injection using dual horizontal wells. Compared with the depressurization method, this method required less depressurization to produce the same amount of gas with pressure drawdown up to 10MPa. This causes less seabed subsidence; therefore, the hot-water injection method is a more environmentally friendly gas-production method for offshore MH reservoirs.",
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AU - Sugai, Yuichi

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AB - Seabed subsidence is studied by comparing experimental data with the results of a numerical model for gas production from an offshore methane hydrate (MH) reservoir using the hot-water injection method. To predict seafloor displacement, geo-mechanical reservoir models, such as the consolidation– permeability compound model, are required to simulate MH dissociation and consolidation by depressurization in the MH reservoir. In this study, we constructed a field-scale model of gas production from a MH reservoir induced by hot-water injection using dual horizontal wells. Compared with the depressurization method, this method required less depressurization to produce the same amount of gas with pressure drawdown up to 10MPa. This causes less seabed subsidence; therefore, the hot-water injection method is a more environmentally friendly gas-production method for offshore MH reservoirs.

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JO - International Journal of Petroleum and Petrochemical Engineering

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