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mixed-wettability
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Simulation of Spontaneous Capilary Imbibition and Gravity Effects on Oil Recovery in Naturally Fractured Reservoirs
,
M.Sc. Thesis
Sharif University of Technology
;
Jamshidi, Saeed
(Supervisor)
;
Bozorgmehri, Ramin
(Supervisor)
Abstract
Oil reservoirs, have integrated identity; that is they consist of different parameters such as wettablity, initial water saturation, capillary and gravity forces, etc. which are related to each other and affect ultimate recovery simultaneously. In fractured reservoirs, other parameters such as fractures and complex geological structures are also considered among important parameters which affect ultimate recovery. Due to large amount of reserves, fractured reservoirs are subject to different studies and simulations. In this research, different parameters which affect ultimate recovery in fractured reservoirs, are studied and simulated. Different studies ...
Pore-scale Simulation of the Effect of Pore Geometry and Surface Heterogeneity on Oil Recovery by Low-salinity Water Flooding
, M.Sc. Thesis Sharif University of Technology ; Mahani, Hassan (Supervisor) ; Ayatollahi, Shahabodin (Supervisor)
Abstract
Low-salinity waterflooding (LSWF) is a promising EOR approach that decreases the oil-wetness of reservoir rocks, hence increasing the recovery factor. Despite the importance of the pore-geometry on the performance of LSWF, especially in 3D simulations being affected by corner-flow and roughness, it is not yet investigated, thus in this thesis we aim at studying the aforementioned effects on LSWF. According to the preceding studies, during the drainage phase, the brines in the corners of pores cannot be displaced by oil because of requiring very high capillary pressure; thereby rendering a mixed-wet system. Hence considering this type of wettability is necessary for two-phase flow...
Relative permeabilities hysteresis for oil/water, gas/water and gas/oil systems in mixed-wet rocks
, Article Journal of Petroleum Science and Engineering ; Volume 161 , February , 2018 , Pages 559-581 ; 09204105 (ISSN) ; Sohrabi, M ; Sharif University of Technology
Elsevier B.V
2018
Abstract
Accurate determination of relative permeability (kr) curves and their hysteresis is needed for reliable prediction of the performance of oil and gas reservoirs. A few options (e.g., Carlson, Killough and Jargon models) are available in commercial reservoir simulators to account for hysteresis in kr curves under two-phase flow. Two-phase kr curves are also needed for estimating kr hysteresis under three-phase flow during water-alternating-gas (WAG) injection. Although, most oil reservoirs are mixed-wet, the existing hysteresis predictive approaches have been developed based on water-wet conditions. Experimentally measured data are needed to assess the performance of these methodologies under...
Assessment of two-phase relative permeability hysteresis models for oil/water, gas/water and gas/oil systems in mixed-wet porous media
, Article Fuel ; Volume 309 , 2022 ; 00162361 (ISSN) ; Gharavi, A ; Fatemi, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Accurate determination of relative permeability curves and their hysteresis is vital for reliable prediction of the performance of oil and gas reservoirs under enhanced recovery processes. Two out of the three available approaches to simulate three-phase relative permeability hysteresis are based on two-phase hysteresis. A few options (e.g., Carlson, Killough and Jargon models) are available in commercial reservoir simulators to account for hysteresis in relative permeability curves under two-phase flow. These models are based on the assumptions of water-wet state of the rocks, while most of the reservoir rocks are mixed-wet. As a result the aim of the present work is to evaluate the...