干旱区生态环境知识资源中心(Arid): Development and experimental evaluation of models for low capillary number two-phase flows in rough walled fractures relevant to natural gradient conditions

Arid

DOI	10.2172/534488
报告编号	SAND--96-2820
来源ID	OSTI_ID: 534488
	Development and experimental evaluation of models for low capillary number two-phase flows in rough walled fractures relevant to natural gradient conditions
	Glass, R.J.; Yarrington, L. [Sandia National Labs., Albuquerque, NM (United States)]; Nicholl, M.J. [Oklahoma State Univ., Stillwater, OK (United States)]
英文摘要	The major results from SNL`s Conceptual Model Development and Validation Task (WBS 1.2.5.4.6) as developed through exploration of small scale processes were synthesized in Glass et al. to give guidance to Performance Assessment on improving conceptual models for isothermal flow in unsaturated, fractured rock. There, pressure saturation and relative permeability curves for single fractures were proposed to be a function of both fracture orientation within the gravity field and initial conditions. We refer the reader to Glass et al. for a discussion of the implications of this behavior for Performance Assessment. The scientific research we report here substantiates this proposed behavior. We address the modeling of phase structure within fractures under natural gradient conditions relevant to unsaturated flow through fractures. This phase structure underlies the calculation of effective properties for individual fractures and hence fracture networks as required for Performance Assessment. Standard Percolation (SP) and Invasion Percolation (IP) approaches have been recently proposed to model the underlying phase saturation structures within the individual fractures during conditions of two-phase flow. Subsequent analysis of these structures yields effective two-phase pressure-saturation and relative permeability relations for the fracture. However, both of these approaches yield structures that are at odds with physical reality as we see in experiments and thus effective properties calculated from these structures are in error. Here we develop and evaluate a Modified Invasion Percolation (MIP) approach to better model quasi-static immiscible displacement in fractures. The effects of gravity, contact angle, local aperature field geometry, and local in-plane interfacial curvature between phases are included in the calculation of invasion pressure for individual sites in a discretized aperture field.
出版年	1997
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	05 NUCLEAR FUELS ; YUCCA MOUNTAIN ; SITE CHARACTERIZATION ; UNDERGROUND FACILITIES ; HYDROLOGY ; SPENT FUELS ; UNDERGROUND DISPOSAL ; HIGH-LEVEL RADIOACTIVE WASTES ; FLUID FLOW ; GEOLOGIC MODELS ; GEOLOGIC FRACTURES
URL	http://www.osti.gov/scitech/servlets/purl/534488
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/267260
推荐引用方式 GB/T 7714	Glass, R.J.,Yarrington, L. [Sandia National Labs., Albuquerque, NM ,Nicholl, M.J. [Oklahoma State Univ., Stillwater, OK . Development and experimental evaluation of models for low capillary number two-phase flows in rough walled fractures relevant to natural gradient conditions,1997.