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Enhanced oil recovery by spontaneous imbibition of nanofluid assisted low saline alkali polymer in sandstone reservoir

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Journal of Molecular Liquids 2025年 428卷

作者： Seetharaman, Gomathi Rajalakshmi Devakumar, N.P. Deshmukh, Minal Sangwai, Jitendra S. Enhanced Oil Recovery Laboratory Petroleum Engineering Programme Department of Ocean Engineering Indian Institute of Technology Madras Chennai600 036 India Department of Chemical Engineering Indian Institute of Technology Madras Chennai600 036 India Center of Excellence on Subsurface Mechanics and Geo-Energy Indian Institute of Technology Madras Chennai600 036 India Maharashtra Pune411038 India

Spontaneous imbibition plays a crucial role in enhanced oil recovery (EOR). In this work, the synergistic effect of low salinity water, alkali, polymer, and nanoparticles was explored as a potential oil recovery agent for low acid number crude oil in a sandstone reservoir. Silica nanoparticles (15 nm) at various concentrations (100–1000 ppm) were dispersed in low salinity water (lowsal) containing sodium carbonate (alkali) and polyacrylamide (PAM, polymer), referred to as low saline-alkali-polymer-nanofluid (LSAP-NFs). Interfacial tension (IFT) and contact angle measurements were performed at 50 °C to understand the impact of LSAP-NFs on EOR through spontaneous imbibition. The results showed that the larger molecular size of the polymer hindered the effect of alkali in reducing the IFT and altering the wettability. The imbibition efficiency of the LSAP-NFs was evaluated using an Amott cell at 50 °C with Berea sandstone core samples. The spontaneous imbibition results showed that the imbibition effectiveness of the LSAP-NFs was higher than that of simple alkali, LSAW, and LSAP flooding agents. The prominent mechanism of imbibition was studied by analyzing the solid–liquid interfacial force using F-D mode from Atomic Force Microscope (AFM) investigations. The interfacial mechanisms, including IFT, wettability, surface roughness, and solid–liquid interfacial forces, confirmed that the imbibition process is equally controlled by gravity and capillary forces. Further, the solid–liquid interfacial force exposed a fully hydrophilic surface with silica nanofluid, confirming that capillary force dominates imbibition. This work identifies the fundamental mechanism by which spontaneous imbibition impacts enhanced oil recovery. © 2025 Elsevier B.V.

关键词： Sandstone

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Statistical modeling and optimization of a multistage gas-solid fluidized bed for removing pollutants from flue gases

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Particuology 2015年第5期13卷 72-81页

作者： K.Mahalik Y.K.Mohanty K.C.Biswal G.K.Roy J.N.Sahu Department of Chemical Engineering Gandhi Institute of Engineering and Technology Department of Chemical Engineering National Institute of Technology Department of Chemical Engineering Faculty of EngineeringUniversity of Malaya Petroleum and Chemical Engineering Programme Area Faculty of EngineeringInstitut Teknologi Brunei(A Technology University)

The present paper describes the statistical modeling and optimization of a multistage gas-solid fluidized bed reactor for the control of hazardous pollutants in flue gas. In this work, we study the hydrodynamics of the pressure drop and minimum fluidization velocity. The hydrodynamics of a three-stage fluidized bed are then compared with those for a single-stage unit. It is observed that the total pressure drop over all stages of the three-stage fluidized bed is less than that of an identical single-stage system. However, the minimum fluidization velocity is higher in the single-stage unit. Under identical conditions, the minimum fluidization velocity is highest in the top bed, and lowest in the bottom bed. This signifies that the behavior of solids changes from a well-mixed flow to a plug-flow, with intermediate behavior in the middle bed.

关键词： Fluidized bed Multi-stage Pressure drop Minimum fluidization velocity Optimization

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Rapid adsorption of toxic Pb(Ⅱ) ions from aqueous solution using multiwall carbon nanotubes synthesized by microwave chemical vapor deposition technique

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Journal of Environmental Sciences 2016年第7期28卷 143-155页

作者： Nabisab Mujawar Mubarak Jaya Narayan Sahu Ezzat Chan Abdullah Natesan Subramanian Jayakumar Department of Chemical Engineering Faculty of Engineering and Science Curtin University Sarawak Department of Chemical Engineering Faculty of Engineering University of Malaya Petroleum and Chemical Engineering Programme Area Faculty of Engineering Institut Teknologi Brunei Malaysia–Japan International Institute of Technology Universiti Teknologi Malaysia Jalan Semarak

Multiwall carbon nanotubes（MWCNTs） were synthesized using a tubular microwave chemical vapor deposition technique, using acetylene and hydrogen as the precursor gases and ferrocene as catalyst. The novel MWCNT samples were tested for their performance in terms of Pb（Ⅱ）binding. The synthesized MWCNT samples were characterized using Fourier Transform Infrared（FT-IR）, Brunauer, Emmett and Teller（BET）, Field Emission Scanning Electron Microscopy（FESEM） analysis, and the adsorption of Pb（Ⅱ） was studied as a function of p H,initial Pb（Ⅱ） concentration, MWCNT dosage, agitation speed, and adsorption time, and process parameters were optimized. The adsorption data followed both Freundlich and Langmuir isotherms. On the basis of the Langmuir model, Qmaxwas calculated to be 104.2 mg/g for the microwave-synthesized MWCNTs. In order to investigate the dynamic behavior of MWCNTs as an adsorbent, the kinetic data were modeled using pseudo first-order and pseudo second-order equations. Different thermodynamic parameters, viz., ΔH0, ΔS0and ΔG0were evaluated and it was found that the adsorption was feasible, spontaneous and endothermic in nature. The statistical analysis revealed that the optimum conditions for the highest removal（99.9%） of Pb（Ⅱ） are at p H 5, MWCNT dosage 0.1 g, agitation speed 160 r/min and time of 22.5 min with the initial concentration of 10 mg/L. Our results proved that microwave-synthesized MWCNTs can be used as an effective Pb（Ⅱ） adsorbent due to their high adsorption capacity as well as the short adsorption time needed to achieve equilibrium.

关键词： Microwave Heavy metal Wastewater treatment Adsorption MWCNTs Lead

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Removal of 2,6-dichlorophenol by adsorption with activated polypropylene nanofiber

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Journal of King Saud University - engineering Sciences 2024年第8期36卷 677-683页

作者： Krishnaiah, Duduku Baskaran, Arswitaa Anisuzzaman, S.M. Reddy Prasad, D.M. Chemical Engineering Programme School of Engineering and Information Technology Universiti Malaysia Sabah Sabah Kota Kinabalu88999 Malaysia Petroleum and Chemical Engineering Programme Area Faculty of Engineering Universiti Teknologi Brunei Tungku Highway GadongBE1410 Brunei

2,6-Dichlorophenol is an organochloride of phenol, and it is considered one of the emerging pollutants in wastewater due to its extreme corrosive nature and toxicity even at low concentrations. Melt-blown activated polypropylene (PP) nanofiber is a polymeric adsorbent and it is used to investigate the removal of 2,6-dichlorophenol. The high surface-to-volume ratio, high porosity, low surface energy, low density, and excellent mechanical characteristics of melt-blown PP nanofiber make it a suitable adsorbent. On the removal efficiency of 2,6-dichlorphenol, the influence of the initial concentration of 2,6-dichlorphenol, the weight of PP nanofiber utilized, temperature, and pH of the solution were examined. The Langmuir model, with a maximum adsorption capacity of 44.44 mg/g, was found to be the best match for the adsorption isotherm. Scanning Electron Microscopy (SEM) and Fourier-Transform Infrared Spectroscopy were used to examine melt-blown PP nanofiber before and after adsorption (FTIR). Through SEM images, it was proven that the average diameter of PP nanofiber after adsorption had increased up to 7.93 μm. Furthermore, the existence of phenolic chemicals on the surface of PP nanofiber is confirmed by FTIR analysis spectra. The pseudo-first-order model matched the kinetic data nicely. © 2021 The Authors

关键词： Scanning electron microscopy

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Experimental studies of sand production from unconsolidated sandstone Niger-Delta petroleum reservoir

Experimental studies of sand production from unconsolidated ...

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Society of petroleum Engineers Nigeria Annual International Conference and Exhibition 2011

作者： Adeyanju, O.A. Oyekunle, L.O. Chemical Engineering Department Petroleum and Gas Engineering Programme University of Lagos Nigeria

ISBN: (纸本)9781618390943

Sand production from Nigeria's Niger-Delta oil and gas reservoir has been simulated with a physical model. The model can accommodates both unconsolidated and consolidated sandstone cores. The objective was to determine the ability of using the flow rate to control the production of sand. Results show that the sand production is both affected by the flow rates, the confining pressure, the drawdown and the viscosity of the formation fluid. High sand-free flow rates can be achieved if the sand formation is mechanically confined (compacted). The grain size distribution of the produced sand in the laboratory is identical to that of the field sample. At high confining pressure only small sand sizes are produced from the porous medium. In case of water and light crude oil sand production can be controlled by managing the flow rate while it is impossible to control sand production from heavy crude oil formation by managing the flow rate alone. According to the confining pressure results, shallow formation results in larger sand production than those in deeper wells. Copyright 2011, Society of petroleum Engineers.

关键词： Sand

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Thermodynamics prediction of wax precipitation using the Patel-Teja equation of state

Thermodynamics prediction of wax precipitation using the Pat...

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作者： Farayola, K.K. Adeboye, Y.B. Adekomaya, O.A. Olatunde, A.O. Petroleum and Gas Engineering Programme Department of Chemical Engineering University of Lagos Nigeria Department of Chemical Engineering University of Lagos Nigeria

ISBN: (纸本)9781617388835

Flow assurance is a problem which plagues the petroleum industry. The purpose of this study is to predict wax precipitation in crude oil pipelines. The industry spends millions of dollars to remediate this problem. As a result, ways are being sought to reduce the occurrence of the phenomenon by predicting as accurately as possible, the wax appearance temperature, which is a very important parameter when analysing the problem of wax precipitation. Experimental methods have been employed in times past, but in recent times, thermodynamic modeling of wax formation allows better prediction of wax deposition in pipelines. A three parameter equation of state, the Patel-Teja EOS is used to describe the non-ideality of the liquid phase (oil) while the UNIQUAC model is used to describe the solid phase (wax). Solid precipitation is measured as temperature drops below the wax appearance temperature. The introduction of the third parameter increases the accuracy of results. The results from this study are in agreement with observations made by Pedersen et al. (1995) and Lira Galeana et al. (1996). This study has shown that the Patel-Teja EOS gives better predictions of wax precipitation when compared with the Peng Robinson EOS. This paper is based on theoretical data only. Accurate prediction of wax precipitation reduces loss time, maintenance cost and production loss due to shut-in. Although a kinetic model is required to estimate the wax deposition rate, accurate thermodynamics model is a key requirement for both wax deposition and precipitation calculations as the kinetics is being controlled by the thermodynamics driving force. The thermodynamic model proves successful and compares favourably with results obtained from the experimental data. © 2010, Society of petroleum Engineers.

关键词： Forecasting

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Distributions of ostracod (Crustacea) biofacies on the continental shelf off south-east Trinidad, western central Atlantic Ocean, suggest the location of an offshore river-induced front within the Orinoco Plume

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Senckenbergiana Lethaea 2008年第2期88卷 199-211页

作者： Wilson, Brent Petroleum Geoscience Programme Department of Chemical Engineering University of the West Indies St. Augustine Trinidad and Tobago

Thirty two seafloor samples were taken over an area of 3600 km2 off south-east Trinidad (water depths 38-102 m), north-east of the Orinoco Delta. A total of 7097 ostracod carapaces and valves from 37 species were pick... 详细信息

Thirty two seafloor samples were taken over an area of 3600 km² off south-east Trinidad (water depths 38-102 m), north-east of the Orinoco Delta. A total of 7097 ostracod carapaces and valves from 37 species were picked from them. Total recovery was co-dominated by Bairdoppilata dorsoangulata and Bradleya ex gr. dictyon, with lesser Radimella ovata, Loxoconcha sp. 2 sensu BREMAN, 1982 and Costa variabilicostata recticostata. Cluster analysis revealed four biofacies approximately perpendicular to the bathymetric contours. This arrangement is contrary to the usual pattern, in which biofacies parallel contours, and is suggested to reflect the occurrence of a shelfal, river-induced front entrained within the hypopycnal Orinoco Plume. The front marks where outflow from the Essequibo and Orinoco rivers abuts against surface water rich in outflow from the Amazon. The biofacies immediately under the front yielded particularly high proportions of B. ex. gr. dictyon and B. dorsoangulata, but relatively few Loxoconcha sp. 2. Application of SHE Analysis for Biozone Identification (SHEBI) indicated that within the biofacies there occur abundance biozone boundaries at -55m, 75 m and 100 m that separate areas with differing population structures. SHE Analysis for Community Structure Investigation (SHESCI) indicated that, although the species proportions within most abundance biozones have a logarithmic series distribution, the rate of increase in species richness as specimens were accumulated was lowest in an abundance biozone below the front. © E. Schweizerbart'sche Verlagsbuchhandlung (Nägele u. Obermiller) 2008.

关键词： Amazon Essequibo Orinoco Ostracoda SHE analysis

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Ocean-based sorbents for decontamination of metal-bearing wastewaters: a review

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Environmental Technology Reviews 2018年第1期7卷 139-155页

作者： Senthilkumar, R. Reddy Prasad, D.M. Lakshmanarao, Govindarajan Krishnan, Saravanakumar Naveen Prasad, B.S. Department of Engineering College of Applied Sciences Sohar Oman Petroleum and Chemical Engineering Programme area Faculty of Engineering Universiti Teknologi Brunei Gadong Brunei Sathyabama Institute of Science and Technology Chennai India

Remediation of heavy metal contaminated aqueous streams is of utmost importance due to recalcitrant and persistent behaviour of heavy metals in environment. Traditional removal techniques used for the remediation of toxic heavy metals are either costly or inefficient as well as produce enormous quantity of toxic chemical sludge. On the other hand, biosorption is evolving as an alternative treatment method to the traditional methods for remediation as well as selective recovery of metal ions from contaminated waters. Biosorption presents several inherent merits over other conventional as well as biological methods such as cost-effectiveness, high sorptional uptake, biological or chemical sludge minimization, regeneration/reuse of biosorbents, operation over wide range of physico-chemical conditions as well as possibility of metal recovery. Of the various biosorbents, ocean-based sorbent materials are copious and economical biosorbents for metal-bearing wastewaters. Seaweeds, crab shell, sea grass, seashell and fish scales are studied as ocean-based sorbents for various metal ions. The inherent chemical composition as well as the presence of various functional groups (carboxyl, amine, phosphonate, etc.) enabled the ocean-based sorbents to perform well in metal biosorption. The scope of this present review paper is to collate scattered existing information/results on different ocean-based waste materials utilized as sorbent for various metal ions. In addition, the application of ocean-based sorbents to real metal-bearing wastewaters was also evaluated. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Heavy metals

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Hydrocarbon flow simulations in porous and permeable media using finite element analyses and discrete fracture network

Hydrocarbon flow simulations in porous and permeable media u...

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Society of petroleum Engineers Nigeria Annual International Conference and Exhibition 2011

作者： Farayola, K.K. Oluokun, M.T. Adeniyi, V.O. Fakinlede, O.A. Petroleum and Gas Engineering Programme Department of Chemical Engineering University of Lagos Nigeria Department of Chemical Engineering University of Lagos Nigeria Department of Systems Engineering University of Lagos Nigeria

ISBN: (纸本)9781618390943

Naturally fractured reservoirs, NFR are distinguished from the conventional reservoirs by the discontinuities in porous media. Prediction of non-Newtonian fluid flow behaviour in NFR is a challenging work in petroleum engineering. Large quantities of hydrocarbons are present in NFR in different regions of the world. The discontinuities in porous media have complicated the description of the petrophysical structures and the fluid flow in fractured porous and permeable media. This study uses discrete fracture network, DFN to explicitly model the flow of fluids through the fractures. In this study, hydrocarbons are treated as non-Newtonian which is the case with waxy or heavy crude oils. Multiphase fluid flow models in porous media are frequently used in many important applications of Earth Sciences, such as in ground water contamination, subsurface remediation and reservoir modeling, Diaz-Vera et al. (2008). The same is true for single-phase flow in porous media. This simulation is carried out using Carreau viscosity model and power law model to describe the relationship between viscosity and shear rate. The simulation is implemented with finite element analysis software, the COMSOL Multiphysics. The results obtained are compared with reference results of Newtonian flow. The influence of viscosity function on the shear rate is weaker in power-law than in Carreau model. Some other characteristic results along with appropriate analysis are presented. Copyright 2011, Society of petroleum Engineers.

关键词： Hydrocarbons

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Recent advances in chemical modifications of graphene

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Nano Research 2015年第4期8卷 1039-1074页

作者： Sunil P. Lonkar Yogesh S. Deshmukh Ahmed A. Abdala Department of Chemical Engineering The Petroleum Institute PO Box 2533 Abu Dhabi UAE Faculty of Humanities and Sciences Maastricht Science Programme Maastricht University Minderbroedersberg 4-6 6211LK Maastricht the Netherlands

Graphene has attracted the interest of chemists, physicists, and materials scientists due to its extraordinary structural, mechanical, and electronic properties. While pristine graphene is desirable for applications that require a high electrical conductivity, many other applications require modified or functionalized forms of graphene, such as graphene oxide, reduced graphene, or other functionalized forms. Structurally modifying graphene through chemical functionalization reveals the numerous possibilities for tuning its structure; several chemical and physical functionalization methods have been explored to improve the stabilization and modification of graphene. In this review, we report recent progress towards the chemical modification of graphene, including both covalent and noncovalent methods, for use in various applications.

关键词： graphene graphene oxide functionalization covalent non-covalent applications

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