Preparation of Warm Brine in Situ Seafloor Based on the Hydrate Process for Marine Gas Hydrate Thermal Stimulation

An energy-efficient hydrate-based warm brine preparation method in situ seafloor was first proposed for marine natural gas hydrates (NGH) exploitation. The detailed preparation process and key technologies are discussed. The optimal hydrate-former, cyclopentane + CH4, is viable for preparing warm br...

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Bibliographic Details
Main Authors: Chen, Zhaoyang, Feng, Jingchun, Li, Xiaosen, Zhang, Yu, Li, Bo, Lv, Qiunan
Format: Article in Journal/Newspaper
Language:English
Published: 2014
Subjects:
Science & Technology
Technology
Engineering
METHANE-HYDRATE
PHASE-EQUILIBRIUM
CARBON-DIOXIDE
THERMODYNAMIC STABILITY
NUMERICAL-SIMULATION
POROUS-MEDIA
STATIC MIXER
DISSOCIATION
CYCLOPENTANE
INJECTION
Chemical
Methane hydrate
Online Access:http://ir.giec.ac.cn/handle/344007/10715
https://doi.org/10.1021/ie501181
Description
Summary:An energy-efficient hydrate-based warm brine preparation method in situ seafloor was first proposed for marine natural gas hydrates (NGH) exploitation. The detailed preparation process and key technologies are discussed. The optimal hydrate-former, cyclopentane + CH4, is viable for preparing warm brine under various seawater depths. The heating coefficient of the warm brine preparation reaches 3.0. The NGH production performance by depressurization in conjunction with the prepared warm brine stimulation was studied by numerical simulation. The warm brine stimulation accelerates gas production. The gas production behavior performs better with the higher salinity and temperature. However, these positive effects are limited by the direct seepage of the brine from the injection well to the production well. The massive water production from the overburden and underburden layers causes low RGW and energy efficiency. Compared to the conventional hot brine injection, the good performance of the warm brine injection confirms the feasibility of the new method.

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