Modeling of caprock discontinuous fracturing during CO2 injection into a deep brine aquifer

doi:10.1016/j.ijggc.2013.10.016

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 期刊论文

	Modeling of caprock discontinuous fracturing during CO2 injection into a deep brine aquifer
	Feng, Xia-Ting1 ; Pan, Peng-Zhi 1,2; Rutqvist, Jonny 2; Yan, Fei 1
刊名	INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
	2013
卷号	19 页码:559-575
关键词	Rock discontinuous cellular automaton TOUGH2 CO2 injection Fracture propagation Hydraulic fracturing
ISSN号	1750-5836
DOI	10.1016/j.ijggc.2013.10.016
英文摘要	In this paper, we present a discontinuous method for simulating coupled multiphase fluid flow and hydraulic fracturing, and apply this method to deep underground CO2 injection. In this modeling approach, the individual physical processes involved in hydraulic fracturing are identified and addressed as separate modules: (1) a rock-discontinuous-cellular-automaton method for continuous-discontinuous geomechanical fracturing analysis, and (2) an integrated finite volume method for representing non-isothermal, multiphase fluid-flow processes. With this approach, the real fracture propagation path (straight or curved) induced by CO2 injection can be modeled without the need for remeshing. We verify the method and the numerical model against analytical solutions for fracture opening and propagation. We then simulate CO2 injection-induced fracturing within a brine aquifer, demonstrating the capability and applicability of our coupled numerical method for simulating fracturing processes driven by multiphase fluid flow. Our study focuses on the role of initial caprock damage in geologic carbon sequestration, and how natural fractures could impact caprock sealing integrity. We find that, given initial damage or fracturing in the lower part of the caprock, injection-induced pressure can diffuse into the fracture and potentially propagate upwards across the caprock, creating a new flow path by which CO2 could migrate out of the intended storage aquifer. However, our modeling also shows that an injection pressure limited by minimum principal compressive stress (which might be estimated from leak-off or mini-frac tests) would be appropriate for safe injection with respect to maintaining caprock sealing integrity. Finally, our modeling also highlights the importance and usefulness of pressure and deformation monitoring potentially effective techniques for early detection of deep fracture propagation breaking through a caprock layer. (C) 2013 Elsevier Ltd. All rights reserved.
WOS研究方向	Science & Technology - Other Topics ; Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000330491400053
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/3528]
专题	岩土力学所知识全产出_期刊论文岩土力学所知识全产出国家重点实验室知识产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 2.Univ Calif Berkeley, Lawrence Berkeley Natl Lab
推荐引用方式 GB/T 7714	Feng, Xia-Ting,Pan, Peng-Zhi,Rutqvist, Jonny,et al. Modeling of caprock discontinuous fracturing during CO2 injection into a deep brine aquifer[J]. INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL,2013,19:559-575.
APA	Feng, Xia-Ting,Pan, Peng-Zhi,Rutqvist, Jonny,&Yan, Fei.(2013).Modeling of caprock discontinuous fracturing during CO2 injection into a deep brine aquifer.INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL,19,559-575.
MLA	Feng, Xia-Ting,et al."Modeling of caprock discontinuous fracturing during CO2 injection into a deep brine aquifer".INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL 19(2013):559-575.