CT Imaging of Two Phase Flow in Fractured Porous Media PDF Download
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Languages : en
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This paper describes the design, construction, and preliminary results of an experiment that studies imbibition displacement in two fracture blocks. Three core configurations were constructed. The configurations are a compact core, a two-block system with a 1 mm spacer between the blocks, and a two-block system with no spacer. The blocks are sealed in epoxy so that saturation measurements can be made throughout the displacement experiments using a Computed Tomography (CT) scanner. Preliminary results are presented from a water/air experiment. These results suggest that it is incorrect to assume negligible capillary continuity between matrix blocks as is often done.
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Languages : en
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This paper describes the design, construction, and preliminary results of an experiment that studies imbibition displacement in two fracture blocks. Three core configurations were constructed. The configurations are a compact core, a two-block system with a 1 mm spacer between the blocks, and a two-block system with no spacer. The blocks are sealed in epoxy so that saturation measurements can be made throughout the displacement experiments using a Computed Tomography (CT) scanner. Preliminary results are presented from a water/air experiment. These results suggest that it is incorrect to assume negligible capillary continuity between matrix blocks as is often done.
![Design and Construction of an Experiment for Two-phase Flow in Fractured Porou [i.e. Porous] Media PDF](https://books.google.com/books/content/images/frontcover/8TibDo0v5BIC?fife=w80-h100)
Author: Rafael E. G. Ayala
Publisher:
ISBN:
Category : Porous materials
Languages : en
Pages : 130
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Languages : en
Pages : 67
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The simulation of flow in naturally fractured reservoirs commonly divides the reservoir into two continua - the matrix system and the fracture system. Flow equations are written presuming that the primary flow between grid blocks occurs through the fracture system and that the primary fluid storage is in the matrix system. The dual porosity formulation of the equations assumes that there is no flow between matrix blocks while the dual permeability formulation allows fluid movement between matrix blocks. Since most of the fluid storage is contained in the matrix, recovery is dominated by the transfer of fluid from the matrix to the high conductivity fractures. The physical mechanisms influencing this transfer have been evaluated primarily through numerical studies. Relatively few experimental studies have investigated the transfer mechanisms. Early studies focused on the prediction of reservoir recoveries from the results of scaled experiments on single reservoir blocks. Recent experiments have investigated some of the mechanisms that are dominant in gravity drainage situations and in small block imbibition displacements. The mechanisms active in multiphase flow in fractured media need to be further illuminated, since some of the experimental results appear to be contradictory. This report describes the design, construction, and preliminary results of an experiment that studies imbibition displacement in two fracture blocks. Multiphase (oil/water) displacements will be conducted at the same rate on three core configurations. The configurations are a compact core, a two-block system with a 1 mm spacer between the blocks, and a two-block system with no spacer. The blocks are sealed in epoxy so that saturation measurements can be made throughout the displacement experiments using a Computed Tomography (CT) scanner.
Author: Richard Gary Hughes
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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Author: Zhangxin Chen
Publisher: SIAM
ISBN: 0898716063
Category : Computers
Languages : en
Pages : 551
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This book offers a fundamental and practical introduction to the use of computational methods. A thorough discussion of practical aspects of the subject is presented in a consistent manner, and the level of treatment is rigorous without being unnecessarily abstract. Each chapter ends with bibliographic information and exercises.
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Languages : en
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The major goal of this research project was to improve the understanding of the gas-oil two-phase flow in fractured porous media. In addition, miscible displacement was studied to evaluate its promise for enhanced recovery.
Author: Richeng Liu
Publisher: MDPI
ISBN: 3039214233
Category : Technology & Engineering
Languages : en
Pages : 578
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Book Description
The fluid flow in fracture porous media plays a significant role in the assessment of deep underground reservoirs, such as through CO2 sequestration, enhanced oil recovery, and geothermal energy development. Many methods have been employed—from laboratory experimentation to theoretical analysis and numerical simulations—and allowed for many useful conclusions. This Special Issue aims to report on the current advances related to this topic. This collection of 58 papers represents a wide variety of topics, including on granite permeability investigation, grouting, coal mining, roadway, and concrete, to name but a few. We sincerely hope that the papers published in this Special Issue will be an invaluable resource for our readers.
Author: Mohammad J. Sabti
Publisher:
ISBN: 9780438385245
Category : Enhanced oil recovery
Languages : en
Pages : 152
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In this work, we used a high-resolution micro-CT scanner integrated with a three-phase core-flooding apparatus to perform two- and three-phase flow experiments on fractured sandstone and carbonate rock samples. The study aimed at investigating how the fluids in the matrix interact with those in the fracture conduit when oil spreadability plays a key role. In-situ fluid distribution maps are compared under spreading and nonspreading conditions during secondary and tertiary gas injection processes. In the case of spreading fluid system and secondary gas injection process, the oil phase in the matrix is not trapped. The injected gas invades large oil-filled pores in the matrix and displaces oil into the fracture while leaving relatively thick spreading layers of the defending fluid in the crevices. These layers play a pivotal role in maintaining the hydraulic connectivity of oil and ultimately lower remaining oil saturation significantly. In case where the initial oil saturation in the matrix is hydraulically trapped due to a preceding waterflood, gas first displaces brine before accessing oil. When gas reaches trapped oil globules, the oil spreads between brine in the corners and gas in the center of the elements and becomes reconnected. In both scenarios, the oil phase maintains its hydraulic conductivity through spreading layers and drains into the fracture. This phenomenon has a significant impact on oil production from matrix in fractured oil reservoirs. However, infrequent oil layers observed under nonspreading condition are not stable and collapse easily as gas/oil capillary pressure is increased during gas injection. This means that oil has poor connectivity that hinders its movement from the matrix to the fracture. In another group of experiments, the effect of wettability on matrix-fracture interactions is investigated by performing tertiary gas injection on an oil-wet fractured limestone sample. The distribution of the measured in-situ contact angles indicated that the wettability alteration in the matrix surrounding the fracture was relatively less uniform and lower than that in the intact matrix. This was attributed to the presence of fracture, which reduced the invasion of crude oil into the neighboring matrix during drainage. The insight developed in this work using different rock types, wettability conditions, and three-phase saturation histories may have direct implications for the design of EOR schemes involving gas injection.
Author: Dustin Crandall
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 384
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Author: Qingqing Gu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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