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您的检索式：作者名="Mohammad Mahdi Shadman"
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| 1 | Performance of low-salinity water flooding for enhanced oil recovery improved by SiO_2 nanoparticles显示文摘Low-salinity water injection has been utilized as a promising method for oil recovery in recent years. Low-salinity water flooding changes the ion composition or brine salinity for improving oil recovery. Recently, the application of nanoparticles with low-salinity water flooding has shown remarkable results in enhanced oil recovery(EOR). Many studies have been performed on the effect of nanofluids on EOR mechanisms. Their results showed that nanofluids can improve oil recovery when used in low-salinity water flooding. In this work, the effects of injection of low-salinity water and low-salinity nanofluid(prepared by adding SiO_2 nanoparticles to low-salinity water) on oil recovery were investigated. At first, the effects of ions were investigated with equal concentrations in low-salinity water flooding. The experimental results showed that the monovalent ions had better performance than the divalent ions because of them having more negative zeta potential and less ionic strength. Also, low-salinity water flooding recovered 6.1% original oil in place(OOIP) more than the high-salinity flooding. Contact angle measurements demonstrated that low-salinity water could reduce the contact angle between oil and water. Then in the second stage, experiments were continued by adding SiO_2 nanoparticles to the K+ solution which had the highest oil recovery at the first stage. The experimental results illustrated that the addition of Si02 nanoparticles up to 0.05 wt% increased oil recovery by about 4% OOIP more than the low-salinity water flooding. | Tangestani Ebrahim Vafaie Sefti Mohsen Shadman Mohammad Mahdi Kazemi Tooseh Esmaeel Ahmadi Saeb | 2019 | Petroleum Science2019，16，2： | 5 |
| 2 | How much do you know about the methods for determining onset of asphaltene precipitation?显示文摘One of the major problems in all area of petroleum industry,including production,operation,storage and transportation,is formation of heavy organic compounds,e.g.,asphaltene and wax,and their consequent deposition in equipment and pipelines.Change in crude oil composition,temperature and pressure leads to asphaltene precipitation.Thus,it is of vital importance to determine onset of asphaltene precipitation during oil production.In this regard,various techniques have been suggested in literature,each with its own pros and cons.However,from practical point of view,one needs to decide which method serves to be proper one.To this end,present study gives a comprehensive critical review for different techniques serve to determine onset of asphaltene precipitation along with comparing their advantages and disadvantages.Since each method presents its own definition for onset,such as onset of precipitation,clustering and deposition;it is necessary to distinguish their difference based on underlying physical mechanisms.It was concluded that mechanism of asphaltene precipitation for determining onset of asphaltene precipitation plays a substantial role. | Mohammad Mahdi Shadman Amir Hossein Saeedi Dehaghani Mohammad Hasan Badizad | 2017 | Petroleum2017，3，3： | 1 |
| 3 | Procedure for determining the number of thermal diffusion columns in square cascade for separation of Ne stable isotopes显示文摘The thermal diffusion column represents one method of separating stable isotopes.This method is advantageous for smallscale operations because of the simplicity of the apparatus and small inventory,especially in gas-phase operations.Consequently,it has attracted attention for its applicability in tritium and noble gas separation systems.In this study,the R cascade was used to design and determine the number of columns.A square cascade was adopted for the final design because of its flexibility,and calculations were performed to separate 20Ne and 22Ne isotopes.All the R cascades that enriched the Ne isotopes by more than 99%were investigated,the number of columns was determined,and the square cascade parameters were optimized using the specified columns.Additionally,a calculation code“RSQ_CASCADE”was developed.A unit separation factor of three was considered,and the number of studied stages ranged from 10 to 20.The results showed that the column separation power,relative total flow rate,and required number of columns were linearly related to the number of stages.The separation power and relative total flow decreased and the number of columns increased as the stage number increased.Therefore,a cascade of 85 columns is recommended to separate the stable Ne isotopes.These calculations yielded a 17-stage square cascade with five columns in each stage.By changing the stage cut,feed point,and cascade feed flow rate,the best parameters for the square cascade were determined according to the cascade and column separation powers.As the column separation power had a maximum value in cascade feed 50,it was selected for separating Ne isotopes. | Fatemeh Mansourzadeh Mohammad Mahdi Shadman Javad Karimi Sabet Valiyollah Ghazanfari | 2023 | Nuclear Science and Techniques2023，34，5： | 0 |
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