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effective-fracture
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Experimental seismic investigation of Sefid-rud concrete buttress dam model on shaking table
, Article Earthquake Engineering and Structural Dynamics ; Volume 37, Issue 5 , 2008 , Pages 809-823 ; 00988847 (ISSN) ; Ghaemian, M ; Sharif University of Technology
John Wiley and Sons Ltd
2008
Abstract
Owing to the devastating M7.6 earthquake of 20 June 1990 that occurred in the northern province of Iran, Sefid-rud concrete buttress dam located near the epicenter was severely shaken. The crack penetrated throughout the dam thickness near slope discontinuity, causing severe leakage, but with no general failure. In this study, nonlinear seismic response of the highest monolith with empty reservoir is investigated experimentally through model testing. A geometric-scaled model of 1:30 was tested on a shaking table with high-frequency capability to study dynamic cracking of the model and serve as data for nonlinear computer model calibration. Three construction joints are set up in the model to...
Experimental study of polymer flooding in fractured systems using five-spot glass micromodel: The role of fracture geometrical properties
, Article Energy Exploration and Exploitation ; Volume 30, Issue 5 , 2012 , Pages 689-706 ; 01445987 (ISSN) ; Ghazanfari, M ; Kharrat, R ; Sharif University of Technology
SAGE
2012
Abstract
Water flooding is being widely used in the petroleum industry and has been considered as a simple inexpensive secondary recovery method. But in fractured formations, existence of fracture system in reservoir rock induces an adverse effect on oil recovery by water flooding. Polymer flooding has been successfully applied as an alternative enhanced oil recovery method in fractured formations. But, the role of fracture geometrical properties on macroscopic efficiency of polymer flooding is not yet well-understood, especially in fractured five-spot systems. In this work five-spot glass micromodel, because of micro-visibility, ease of multiple experimentations and also presence of the unexplored...
Investigation of the effect of geometrical properties of networked fractures on the efficiency of steam-assisted gravity drainage process
, Article Petroleum Science and Technology ; Volume 29, Issue 16 , Jul , 2011 , Pages 1625-1636 ; 10916466 (ISSN) ; Kharrat, R ; Vossoughi, S ; Sharif University of Technology
2011
Abstract
Various fracture geometrical properties such as orientation, extension, discontinuity, dispersion, location, and networking were investigated. Results indicate improved oil recovery and sweep efficiency in the presence of vertical fractures. Longer vertical fractures seemed to have even more beneficial effects. Horizontal fractures revealed detrimental effects on oil recovery and the performance became worse for longer horizontal fractures. Discontinuous horizontal fractures caused a better performance especially when combined with continuous vertical fractures (networking). Vertical fractures helped the growth of the steam chamber in the vertical direction, which resulted in higher oil...