The Influence of the Injected Water on the Underground Coalbed Methane Extraction

被引:4
|
作者
Liu, Yanbao [1 ,2 ]
Zhang, Zhigang [1 ,2 ]
Xiong, Wei [1 ,2 ]
Shen, Kai [1 ,2 ]
Ba, Quanbin [1 ,2 ]
机构
[1] Chongqing Res Inst, China Coal Technol & Engn Grp Crop, Gas Res Branch, Chongqing 400037, Peoples R China
[2] Natl Key Lab Gas Disaster Detecting Preventing &, Chongqing 400037, Peoples R China
关键词
hydraulic fracturing; methane adsorption; permeability evolution; water saturation; relative permeability; intrinsic permeability; 2-PHASE FLOW; GAS; ADSORPTION; MODEL; PERMEABILITY; DESORPTION; MECHANISM; IMPACT;
D O I
10.3390/en13051151
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The increasing demand on coal production has led to the gradually increase of mining depth and more high methane mines, which bring difficulties in terms of coalbed methane (CBM) extraction. Hydraulic fracturing is widely applied to improve the production of CBM, control mine gas, and prevent gas outbursts. It improves coal bed permeability and accelerate desorption and migration of CBM. Even though the impacts of hydraulic fracturing treatment on the coal reservoirs are rare, negative effects could not be totally ignored. To defend this defect, the presented work aims to study the influence of water filtration on coal body deformation and permeability evolution. For this purpose, a simulation based finite element method was developed to build a solid-fluid coupled two-phase flow model using commercial software (COMSOL Multiphysics 5.4). The model was verified using production data from a long strike borehole from Wangpo coal mine in Shanxi Province, China. Several simulation scenarios were designed to investigate the adverse impacts of hydraulic fracturing on gas flow behaviors. The mechanisms of both relative and intrinsic permeability evolutions were analyzed, and simulation results were presented. Results show that the intrinsic permeability of the fracture system increases in the water injection process. The impacts of water imitation were addressed that a critical time was observed beyond which water cannot go further and also a critical pressure exists above which the hydraulic pressure would impair the gas flow. Sensitivity analysis also showed that a suitable time and pressure combination could be observed to maximize gas extraction. This work provides an efficient approach to guide the coal bed methane exploitation and other unconventional gas reservoirs.
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页数:16
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