A New Double-Porosity Reservoir Model for Oil/Water Flow Problems

Dutra, T. V.; Aziz, Khalid

doi:10.2118/21248-pa

Cited by 24 publications

(17 citation statements)

References 16 publications

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“…Some solutions were later proposed: the development of parallelepiped unit blocks (Barker 1985) and the model of two separate sets of matrix properties (Abdssah & Ershaghi 1986). As the double porosity approach continued to be used (Almeida & Oliveira 1990;Dutra & Aziz 1992;Lough et al 1997) and more recent works also discussed the flow through the matrix-fracture interface (Zhang ef ai 2006;Weatherill et al 2008), the coupling of the unit block data with a double porosity model is here suggested as a possible way to integrate the structural data into a numerical model of fractured aquifers 2 .…”

Section: Fig 24mentioning

confidence: 99%

Structural hydrogeology in the Kenogami uplands, Quebec, Canada /

Silva¹

2012

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Characterizing the joint system is a very significant component of investigations on fractured rock aquifers, as the secondary porosity controls the groundwater flow. It is also important to analyze the types of interactions between the joints, e.g., the types of termination and the dominancy of a certain joint set, since such information helps to understand the tectonic events that were responsible for the generation of the joint systems in the aquifer. Moreover, the current stress field is usually the most significant in controlling joint aperture, which plays a major role in groundwater flow.The main objective of this work is to characterize an aquifer in fractured crystalline rocks with a fairly homogeneous lithology, defining a hydrogeological model of the study area, through structural surveys at different scales and hydrogeologic data analyses. This study was carried out in the Kenogami uplands, within the Saguenay graben, Quebec. It aimed to answer the following questions: (1) is there a structured joint system in the bedrock, that is, is it possible to identify preferential joint orientations and structural domains? (2) Can joint systems be defined at different scales, e.g. regional and local scales? If yes, are there any relationships between the systems observed at different scales? (3) Can any correlation between the joint system(s) and the past and present stress fields be identified? (4) Is there a relationship between the hydrogeological properties obtained from boreholes and the joint system(s)?The structural survey involved three main phases. First, a characterization at the regional scale of the joint system is derived from air photo interpretation, lineament analysis, and a general field survey at selected sites. The latter involves the investigation IV of the spatial distribution of the main joint sets, and the study of the relative ages of joint sets and past stress field components conducted on horizontal outcrops. Second, a detailed structural survey of selected road cuts was carried out to define and characterize the main joint sets that compose the joint system in the study area. Third, the realization of geophysical borehole logging provided valuable information at depth, especially regarding subhorizontal joint sets. These steps allowed to answer the questions proposed in the beginning of this research.This project allowed the characterization of an aquifer in fractured crystalline rocks, regarding the following aspects: joint systems at different scales, past stress fields, hydraulic properties and the possible relationships between these parameters. The methodology adopted may be applied to other studies on fractured rock aquifers.Finally, a conceptual model was developed for the fractured rock aquifer in the Kenogami uplands, using the unit block approach. This model may be extrapolated to a regional scale, and it reflects the predominance of the subvertical joints in the study area.Other contributions from this work include the introduction of procedures for applying Terzag...

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Section: Fig 24mentioning

confidence: 99%

Structural hydrogeology in the Kenogami uplands, Quebec, Canada /

Silva¹

2012

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“…12 as a constant diffusion coefficient. Description of the diffusion coefficient D would allow to define a dimensionless time due to the following relationship (Chen et al 1995b;Dutra and Aziz 1991): Chen et al (1995a) used the following definition of the dimensionless time: Reis and Cil (1993) defined the following scaling group as similar to Eq. 14:…”

Section: Matrix-fracture Transfer Functions For Counter-current Intermentioning

confidence: 99%

Evaluation of Matrix-Fracture Transfer Functions for Counter-Current Capillary Imbibition

2009

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Different functions describing matrix-fracture transfer were tested for countercurrent capillary imbibition interaction. The recovery curves obtained from capillary imbibition experiments were used to fit the transfer functions. The exponential coefficients yielding the best fit to the experimental data were obtained and correlated to the effective parameters such as viscosity, IFT, matrix length and diameter, matrix permeability and porosity, and wettability using multivariable regression analysis. In order to obtain the recovery curves, experiments were conducted on Berea sandstone and Indiana limestone samples. Cylindrical samples with different shape factors were obtained by cutting the plugs 1, 2.5, and 5 cm in diameter and 2.5, 5, and 10 cm in length. All sides were coated with epoxy except one end. More than fifty static imbibition experiments were carried out on vertically and horizontally situated samples where the imbibition took place upward and lateral directions, respectively. Brine-air, brine-kerosene, brine-mineral oil, and surfactant solution-mineral oil pairs were used as fluids. For many matrix shape factors (especially longer and small diameter ones), dividing the recovery curve into three parts were needed as the early, intermediate, and late times, which are typically distinguished by the time required for the imbibition front to reach the closed boundary at the end of the core. Correlations among the exponential coefficients and rock/fluid properties were developed. It was observed that different rock/fluid properties and transfer mechanisms (capillary imbibition and gravity drainage) govern the process for each part. Hence, the analyses done in this study were useful not only for developing explicit transfer functions but also identifying the physics of the counter-current imbibition recovery.

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“…(13) in Eq. (11) and rescaling the ensuing equation, we obtain the following dimensionless equation. Note that all the independent variables in this and coming equations are dimensionless and the subscript D is dropped for the reason of clear notation:…”

Section: Homogenization Procedures In Stepsmentioning

confidence: 99%

“…Also, more intuitive approaches can be found in the literature. Dutra and Aziz [11] presented a model that takes into account the transient nature of the imbibition process and the effect of variation in fracture saturation. Sarma and Aziz [21] proposed a general numerical technique to calculate the shape factor for any arbitrary shape of the matrix block, i.e.…”

Section: Introductionmentioning

confidence: 99%

Upscaling in Fractured Reservoirs Using Homogenization

2007

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fax 01-972-952-9435. AbstractHomogenization is a powerful upscaling technique, which has been successfully applied to a variety of problems of interest, such as reactive contaminant transport and two phase flow in layered and fractured media. It has several advantages over other upscaling techniques, such as REV averaging. It does not use intuitive closure equations and it explicitly shows the dependence of the upscaled equations on the characteristic dimensionless numbers of interest. It is based on a well defined procedure, which precludes ad hoc assumptions. A disadvantage is that the underlying assumptions of this procedure have not received sufficient attention in the existing literature.This paper examines the existing homogenization models for two phase flow in fractured media with the purpose to clarify the underlying physical assumptions. We give the derivation for a specific case for which we discuss the validity of the assumptions. Finally, we discuss an example to show the applicability of the ensuing model equations.

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A New Double-Porosity Reservoir Model for Oil/Water Flow Problems

Cited by 24 publications

References 16 publications

Structural hydrogeology in the Kenogami uplands, Quebec, Canada /

Structural hydrogeology in the Kenogami uplands, Quebec, Canada /

Evaluation of Matrix-Fracture Transfer Functions for Counter-Current Capillary Imbibition

Upscaling in Fractured Reservoirs Using Homogenization

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