Numerical simulation of the improved gas production from low permeability hydrate reservoirs by using an enlarged highly permeable well wall

Gas production from low-permeability hydrate reservoirs is characterized by very low efficiency. In this work, the enlarged well wall with good permeability was first proposed to improve the gas production performance from low-permeability hydrate reservoir in Liwan 3 area of the South China Sea. Th...

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Bibliographic Details
Published in:Journal of Petroleum Science and Engineering
Main Authors: Zhang, Jinming, Li, Xiaosen, Chen, Zhaoyang, Li, Qingping, Li, Gang, Lv, Tao
Format: Report
Language:English
Published: ELSEVIER 2019
Subjects:
Methane hydrates
Depressurization
Low permeability
Enlarged permeable well wall
Liwan 3 area
EASTERN NANKAI TROUGH
SOUTH CHINA SEA
METHANE-HYDRATE
SHENHU AREA
PRODUCTION BEHAVIOR
ENERGY RECOVERY
ULLEUNG BASIN
POROUS-MEDIA
PUFF METHOD
Energy & Fuels
Engineering
Petroleum
Methane hydrate
Online Access:http://ir.giec.ac.cn/handle/344007/26111
http://ir.giec.ac.cn/handle/344007/26112
https://doi.org/10.1016/j.petrol.2019.106404
Description
Summary:Gas production from low-permeability hydrate reservoirs is characterized by very low efficiency. In this work, the enlarged well wall with good permeability was first proposed to improve the gas production performance from low-permeability hydrate reservoir in Liwan 3 area of the South China Sea. The gas-water production behaviors, the spatial distributions and evolutions of hydrate reservoir parameters and gas-water flow characteristics, induced by constant-depressurization, were investigated and evaluated by numerical simulations under different radius of permeable well wall. Results show that the enlarged well wall provides a high-permeability channel around the production interval and increases the contact area between the production interval and hydrate layer, so the pressure drop propagation speed and distance, i.e. the depressurization efficiency in the hydrate-bearing sediments is increased. Both gas and water production performances are significantly improved, and the gas and water production rates, cumulates and gas to water ratio increase with the increase in permeable well wall radius. The cumulative CH4 and water produced increase by ca. 4 and 3 times, respectively, when the permeable well wall radius increases from 0 to 5 m. However, the heat supply by heat convection of geothermal water is still limited.

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