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    Wyświetlanie 1-6 z 6
    Tytuł:
    Review on Oxide Formation and Aluminum Recovery Mechanism during Secondary Smelting
    Autorzy:
    Osoba, L.O.
    Owolabi, O.B.
    Talabi, S.I.
    Adeosun, S.O.
    Powiązania:
    https://bibliotekanauki.pl/articles/106915.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Al dross
    Al recovery
    hydrometallurgy
    oxidation
    oxide film
    Opis:
    The remelting, refining, and casting process of aluminum alloys often generate aluminum dross containing primarily oxides and nitrides of aluminum and entrapped metallic aluminum at the surface of the molten metal as a result of reactions within the furnace atmosphere at elevated temperatures. The handling of dross is an expensive but necessary activity during aluminum smelting. Furthermore, the amorphous Al2O3 oxide film formed on the pure molten aluminum surface due to the liquid metal randomly distributed atoms is impermeable to the diffusion of aluminum metal and oxygen. In amorphous materials, there is a low mobility of the charge carriers and an absence of preferred diffusion paths. This film can transform to crystalline Al2O3 by nucleation and grows with time and opportunity. This review discusses the mechanism of oxide formation and the aluminum metal recovery processes.
    Źródło:
    Journal of Casting & Materials Engineering; 2018, 2, 2; 45-51
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and Simulation of Reservoir Pressure Associated with Emulsions Transport Near Wellbore for Enhanced Oil Recovery
    Autorzy:
    Adeosun, T. A.
    Adabanija, M. A.
    Akinpelu, F. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030653.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    MATLAB language
    Modeling
    Simulation
    drilling
    emulsion
    oil
    wellbores
    Opis:
    The most important area of a producing reservoir is the near wellbore which is within 5fts into the formation. All fluids have to flow through it, usually at high flow rates. Problems associated with formation damage near wellbore occur frequently, resulting in permeability impairments and increased pressure losses. During drilling, emulsion formation affects reservoir deliverability and ultimate recovery. Most of the existing methods to aid mitigation near oil well damages involve the use of empirical models. Conducting experiments, frequent shut down of wells for proper well test analysis and pressure maintenance are highly expensive and time consuming. Therefore, this paper aimed at optimizing reservoir pressure using cross section comparisons of mathematical tools and experimental for improved emulsion transport near wellbore. Formation damage mechanisms are highlighted for the purpose of reservoir engineers. The engineers must be vigilant about the potential formation damages near wellbore and then can mitigate the impact of damages by understanding its mechanisms how various types of damages might impact production, Assessment, control and remediation. The transient hydraulic diffusivity partial differential equations (THDPDE) models developed. The model equations were resolved using finite difference method and implemented by writing codes in MATLAB language. The solutions obtained were validated using field data and experimental work. The results indicated pressure depletion over time without injection but increases under the influence of increased injection rates enhancing the oil recovery. Experiments were also carried out to evaluate the effectiveness of the emulsions as displacing fluid for enhanced oil reservoir. In this paper, a new modeling scheme is proposed and is based entirely on cross section comparisons involving modification of Darcy’s equation with experimental work in an attempt to optimize reservoir pressure and improved oil-in-water emulsions near wellbore. The knowledge that oil-in-water emulsion type exists and that a new scheme to uniquely characterize the near wellbore damage is developed. The present authors suggest cross section comparisons of both modeling and experimental section for predictions of the data in the study area. Numerical simulation has proved to be effective in simulating emulsions near wellbore. The formulated models indicate pressure depletion over time, but increased thereafter, resulting to increased oil recovery and significant improvement in emulsions transport near wellbore.
    Źródło:
    World Scientific News; 2020, 144; 427-449
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Simulation of Reservoir Formation Damage Due to Mud Filtrate Invasions
    Autorzy:
    Adeosun, T. A.
    Akinpelu, F. O.
    Adabanija, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031288.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    drilling fluids
    formation damage
    mud filtrate
    mudcake
    simulation
    thikness
    Opis:
    This paper examined the numerical simulation of mud filtrate invasion process quantitatively with finite difference scheme that includes the effects of mudcake growth in oil well damage. Most of the existing models are empirical, experimental or rather complex. Efforts have been made to develop the linear flow model involving the modification of Darcy’s equation for determination of mudcake porosity-permeability and thickness through formation pressure near wellbore. The results show the effects of pressure transient on cake buildup over a considerable time intervals. Results also characterized cake parameters and time into low and high permeability zones that are strictly linear with pressure change and supercharging observed during the sensitive formation testing.
    Źródło:
    World News of Natural Sciences; 2021, 34; 98-112
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An oscillatory radiating hydromagnetic internal heat generating fluid flow through a vertcal porous channel with slip and temperature jump
    Autorzy:
    Titiloye, E. O.
    Gbadeyan, J. A.
    Adeosun, A. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/265718.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    skok temperatury
    prędkość poślizgu
    materiał porowaty
    temperature jump
    velocity slip
    hydromagnetic
    oscillatory and porous channel
    Opis:
    The present study concerns the natural convective heat generating/absorbing, radiative magnetohydrodynamic, oscillatory fluid flow through a vertical porous channel with slip and temperature jump. The effect of Joule dissipation is taken into consideration while it is assumed that the flow is fully developed. The differential transforms method(DTM) is employed to solve the system of non-linear ordinary differential equations that is obtained from the non-linear partial differential equations governing the flow. Semi analytical solutions of the steady and unsteady part of the flow in the slip flow regime through a vertical porous channel are obtained. The effects of various flow parameters on the velocity and temperature profiles as well as Nusselt and skin friction are presented graphically and discussed. An excellent agreement between the results of this article and those available in the literature validated the presented approach.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 503-519
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization and Beneficiation of Clays from Ewekoro for use as Drilling Mud
    Autorzy:
    Olatunde, Abayomi O.
    Olafadehan, Olaosebikan A.
    Usman, Mohammed A.
    Adeosun, Tunde A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193491.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Beneficiation
    Bentonite
    Chemical analysis
    Mineralogical analysis
    Montmorillonite
    Opis:
    The proven bentonite reserve in Nigeria has been modestly estimated at more than 700 million tonnes, however her bentonite does not meet the API regulation standard. Hence this work was done with the aim of characterizing and beneficiating Nigeria bentonite clay to meet the required standard. Bentonite clay was gotten from Ewekoro in Ogun state of Nigeria, it was characterized using X-Ray Diffraction (XRD) to identify the structural layers which indicates the arrangement of the atoms in clay samples and X-Ray Fluorescence Spectrophotometer (XRF) which was used in the quantitative analysis of the elements in the sample. The XRD confirmed the presence of montmorillonite meaning the sample contained bentonite, while the XRF confirmed that the sample is Ca-based rather than the standard Na-based, hence the need for beneficiation. Beneficiation of the bentonite was done by ion exchange with Na2CO3 followed by addition with different compositions of viscosifiers namely: carboxymethyl cellulose (CMC), drispac and guar gum. The rheological properties together with the swelling ratio and filter loss of the clay were determined. Although some of the bentonite compositions met the required standard, but the bentonite formulation with the combination of 20.125 g bentonite + 2.875 g guar gum + 0.6 g drispac gave the best result.
    Źródło:
    World Scientific News; 2021, 159; 45-58
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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