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Normal-stress dependence of fracture hydraulic properties including two-phase flow properties

Content Provider	Springer Nature Link
Author	Liu, Hui Hai Wei, Ming Yao Rutqvist, Jonny
Copyright Year	2012
Abstract	A systematic approach has been developed for determining relationships between normal stress and fracture hydraulic properties, including two-phase flow properties. The development of a relationship between stress and fracture permeability (or fracture aperture and fracture closure) is based on a two-part Hooke’s model (TPHM) that captures heterogeneous elastic-deformation processes at a macroscopic scale by conceptualizing the rock mass (or a fracture) into two parts with different mechanical properties. The developed relationship was verified using a number of datasets in the literature for fracture closure versus stress, and satisfactory agreements were obtained. TPHM was previously shown to be able to accurately represent testing data for porous media as well. Based on the consideration that fracture–aperture distributions under different normal stresses can be represented by truncated-Gaussian distributions, closed-form constitutive relationships were developed between capillary pressure, relative permeability and saturation, for deformable horizontal fractures. The usefulness of these relationships was demonstrated by their consistency with a laboratory dataset.Une approche systématique a été développée pour déterminer les relations entre des tensions normales et les propriétés de la fracturation hydraulique, incluant les propriétés d’un flux diphasique. Le développement d’une relation entre tension et perméabilité de fracture (ou ouverture de fracture et fermeture de fracture) est basé sur le modèle diphasique de Hooke (TPHM) qui exprime les processus de déformation élastique hétérogènes à échelle microscopique, en considérant deux parties la masse rocheuse (ou une fracture) présentant des propriétés mécaniques différentes. La relation développée a été vérifiée en utilisant des ensembles de données de la littérature relatives à la fermeture d’une fracture en fonction de la contrainte, et des accords satisfaisants ont été obtenus. Par ailleurs, on avait précédemment montré la capacité de TPLM de représenter de façon précise des données de tests sur des milieux poreux. Considérant que la distributions ouvertures-fractures sous différents tensions normales peut être représentée par une distribution gaussienne tronquée, on a développé des relations constitutives de forme condensée entre pression capillaire, perméabilité relative et saturation pour des fractures horizontales déformables. L’utilité de ces relations a été démontrée par leur concordance avec un ensemble de données de laboratoire.Se desarrolló una aproximación sistemática para determinar las relaciones entre el esfuerzo normal y las propiedades hidráulicas de fracturas, incluyendo las propiedades de dos fases de flujo. El desarrollo de una relación entre esfuerzo y permeabilidad de una fractura (o apertura y cierre de la fractura) está basado sobre dos partes del modelo de Hooke (TPHM) el cual captura procesos de deformación elástica heterogénea en la escala macroscópica, por la conceptualización de una masa de roca (o una fractura) en dos partes con diferentes propiedades mecánicas. La relación desarrollada fue verificada usando un número de conjunto de datos de la literatura para el cierre de una fractura versus el esfuerzo, y se obtuvieron acuerdos satisfactorios. Previamente se demostró que TPHM es capaz de representar con precisión los datos de ensayos para medios porosos. Basado en la consideración que las distribuciones de las aperturas de fracturas bajo diferentes esfuerzos normales pueden ser representadas por distribuciones Gausianas truncadas, la forma cerrada de las relaciones constitutivas fueron desarrolladas entre presión capilar, permeabilidad relativa y saturación para fracturas horizontales deformables. Se demostró la utilidad de estas relaciones por su consistencia con un conjunto de datos de laboratorio.本文研究出一套决定正压力及包含两相流属性的水压致裂特征关系的系统性方法。压力与裂隙渗透性(裂隙孔径及闭合度)的关系是基于双组份Hooke模型(TPHM)开发的。TPHM模型通过将岩体(或裂隙)概念化为具有不同力学属性的两部分而在宏观尺度上捕获各向异性弹性变形过程。通过裂隙闭合度和压力关系文献中的一系列数据集对这发展关系进行验证,得到满意的一致性。先前TPHM模型也可用于正确地代表孔隙介质的测试数据。不同正压力下裂隙孔径分布可由截面高斯分布代表,基于此,通过毛细压力、相对渗透性和饱和度建立可变水平裂隙闭合体组成关系。通过与实验室数据集的一致性证明了这些关系的有用性。Foi desenvolvida uma abordagem sistemática para a determinação das relações entre a tensão normal e as propriedades hidráulicas de fraturas, incluindo as propriedades de fluxo bifásico. O desenvolvimento da relação entre tensão e permeabilidade da fratura (ou abertura e fecho da fratura) baseia-se na aplicação de um modelo Hooke de duas partes (TPHM) que captura os processos de deformação elástica heterogénea a uma escala macroscópica, através da concetualização do maciço rochoso (ou da fratura) em duas partes com propriedades mecânicas diferentes. A relação desenvolvida foi verificada usando um conjunto de dados de base da literatura para o fecho de fraturas em função da tensão, tendo sido obtidos acordos satisfatórios. O TPHM mostrou previamente ser também capaz de representar com precisão os dados de ensaios em meios porosos. Com base na consideração de que as distribuições da abertura de fraturas sob diferentes estados de tensão normal podem ser representadas por distribuições gaussianas truncadas, foram desenvolvidas relações constitutivas fechadas entre pressão capilar, permeabilidade relativa e saturação para fraturas deformáveis horizontais. A utilidade destas relações foi demonstrada pela sua consistência face a resultados de ensaios de laboratório.
Starting Page	371
Ending Page	382
Page Count	12
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	21
Issue Number	2
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2012-11-10
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fractured rocks Hydraulic properties Multiphase flow Hydro-mechanical processes Fracture apertures Hydrogeology Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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