气候变化领域集成服务门户(CCPortal): In Situ Synchrotron X-Ray Microtomography Observations of Fracture Network Evolution of Coal Due to Waterflooding

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DOI	10.1029/2020GL087375
	In Situ Synchrotron X-Ray Microtomography Observations of Fracture Network Evolution of Coal Due to Waterflooding
	Zhang G.; Ranjith P.G.; Li D.; Wanniarachchi W.A.M.; Zhang B.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:10
英文摘要	Water adsorption on coal plays a significant role in the process of CO2 sequestration and enhanced coalbed methane recovery. Direct evidence of how coal adsorbs water and swells, affecting permeability, is still limited. Here, we studied the impact of waterflooding on fracture networks in coal by means of in situ synchrotron X-ray microtomography combined with permeability measurements. We demonstrated that swelling-induced fracture closure was responsible for an order of magnitude permeability reduction after waterflooding for over 4 days. Permeability loss was found to be time dependent, following a logistic function, and about 80% permeability reduction happened in the first 24 hr. There were probably three driven forces for water uptake, including hydrodynamic forces in fractures and macropores, capillary forces in micropores, and diffusion from micropores into deeper coal matrix. Swelling of coal matrix narrowed down and even closed the fractures and as a result weakened fracture connectivity. Residual fractures were mainly mineral-supported fractures, which have strong resistance to swelling-induced stresses. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Coal; Coal deposits; Metal recovery; Methane; Microporosity; Tomography; X rays; CO2 sequestration; Enhanced coalbed methane recoveries; Fracture connectivity; Hydrodynamic forces; In-situ synchrotrons; Logistic functions; Permeability measurements; Permeability reduction; Fracture; coalbed methane; detection method; flooding; fracture network; hydrodynamics; magnetohydrodynamics; observational method; permeability
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170367
作者单位	Deep Earth Energy Laboratory, Department of Civil Engineering, Monash University, Melbourne, VIC, Australia; School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan, China; Huaneng Coal Technology Research Co. Ltd, China Huaneng, Beijing, China
推荐引用方式 GB/T 7714	Zhang G.,Ranjith P.G.,Li D.,et al. In Situ Synchrotron X-Ray Microtomography Observations of Fracture Network Evolution of Coal Due to Waterflooding[J],2020,47(10).
APA	Zhang G.,Ranjith P.G.,Li D.,Wanniarachchi W.A.M.,&Zhang B..(2020).In Situ Synchrotron X-Ray Microtomography Observations of Fracture Network Evolution of Coal Due to Waterflooding.Geophysical Research Letters,47(10).
MLA	Zhang G.,et al."In Situ Synchrotron X-Ray Microtomography Observations of Fracture Network Evolution of Coal Due to Waterflooding".Geophysical Research Letters 47.10(2020).