Numerical Investigation of the Production Behavior of Methane Hydrates under Depressurization Conditions Combined with Well-Wall Heating

In this study, a 2D hydrate dissociation simulator has been improved and verified to be valid in numerical simulations of the gas production behavior using depressurization combined with a well-wall heating method. A series of numerical simulations were performed and the results showed that well-wal...

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Bibliographic Details
Published in:Energies
Main Authors: Ruan, Xuke, Li, Xiao-Sen, Xu, Chun-Gang
Format: Article in Journal/Newspaper
Language:English
Published: 2017
Subjects:
Methane Hydrate
Gas Production
Depressurization
Well-wall Heating
Numerical Simulation
Science & Technology
Technology
Energy & Fuels
GAS-PRODUCTION BEHAVIOR
STRATIGRAPHIC TEST WELL
EASTERN NANKAI TROUGH
ALASKA NORTH SLOPE
POROUS-MEDIA
UNCONSOLIDATED SEDIMENT
THERMAL-STIMULATION
SIMULATION
DISSOCIATION
RESERVOIRS
Alaska North Slope
Methane hydrate
north slope
Alaska
Online Access:http://ir.giec.ac.cn/handle/344007/14082
https://doi.org/10.3390/en10020161
Description
Summary:In this study, a 2D hydrate dissociation simulator has been improved and verified to be valid in numerical simulations of the gas production behavior using depressurization combined with a well-wall heating method. A series of numerical simulations were performed and the results showed that well-wall heating had an influence enhancing the depressurization-induced gas production, but the influence was limited, and it was even gradually weakened with the increase of well-wall heating temperature. Meanwhile, the results of the sensitivity analysis demonstrated the gas production depended on the initial hydrate saturation, initial pressure and the thermal boundary conditions. The supply of heat for hydrate dissociation mainly originates from the thermal boundaries, which control the hydrate dissociation and gas production by depressurization combined with well-wall heating. However, the effect of initial temperature on the gas production could be nearly negligible under depressurization conditions combined with well-wall heating.

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