A numerical framework for two-phase flow of CO2 injection into fractured water-saturated reservoirs

doi:10.1016/j.advwatres.2019.06.008

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	A numerical framework for two-phase flow of CO2 injection into fractured water-saturated reservoirs
	Ahmed, Raheel ; Li, Jun
刊名	ADVANCES IN WATER RESOURCES
	2019
卷号	130 期号:-页码:283-299
关键词	Finite-volume CVD-MPFA Compositional Two-phase Unstructured grid CO2
ISSN号	0309-1708
DOI	10.1016/j.advwatres.2019.06.008
英文摘要	A novel numerical framework is presented for simulation of compositional compressible gas-water phase flow in fractured porous media based on a fully-implicit cell-centred finite-volume method on unstructured grids. We employ a discrete-fracture model where fractures are modelled lower-dimensionally, within a rock matrix. A mass balance equation is solved over the rock-matrix while a lower-dimensional flow equation is solved over the lower-dimensional fractures, with coupling terms to account for the flux transfer from the surrounding rock-matrix. The discretisation of the Darcy-fluxes is based on the control-volume distributed multi-point flux approximation (CVD-MPFA) coupled with a lower-dimensional fracture model. We solve a non-linear system for the primary variables that are the phase pressure and the component molar densities while the secondary variables are updated depending on the updated values of the primary variables at each iteration of the non-linear solver. We use the cubic type equation-of-state (EOS) to model the physical properties of gas components, e.g. CO2. The water phase is multi-component as we allow solubility of gas components in the water phase. Solubility of H2O in the gaseous phase is also included in the developed method. We compare compositional simulation results, using unstructured grids, obtained via the lower-dimensional fracture model and the results obtained by the equidimensional fracture model for a case of CO2 injection into a water saturated reservoir with intersecting fractures. The results show good agreement between the two models while the lower-dimensional fracture model is also computationally cost effective. Results are also presented for the evolution of injected CO2 under gravity through a water saturated reservoir with and without fractures that demonstrate the profound effects of discrete-fractures that can lead to CO2 leakage. The presented method is also applied to a 3D simulation of injection of a multicomponent gas with CO2 and CH4 into a saline water saturated reservoir with a surface 2D fracture network.
WOS研究方向	Water Resources
语种	英语
WOS记录号	WOS:000475554300021
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/14932]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Dimue Technol Co Ltd, Wuhan 430000, Hubei, Peoples R China; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Ahmed, Raheel,Li, Jun. A numerical framework for two-phase flow of CO2 injection into fractured water-saturated reservoirs[J]. ADVANCES IN WATER RESOURCES,2019,130(-):283-299.
APA	Ahmed, Raheel,&Li, Jun.(2019).A numerical framework for two-phase flow of CO2 injection into fractured water-saturated reservoirs.ADVANCES IN WATER RESOURCES,130(-),283-299.
MLA	Ahmed, Raheel,et al."A numerical framework for two-phase flow of CO2 injection into fractured water-saturated reservoirs".ADVANCES IN WATER RESOURCES 130.-(2019):283-299.