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Solving asphaltene precipitation issue in vertical wells via redesigning of production facilities

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Petroleum 2015年第2期1卷 139-145页

作者： Mahdi Zeinali Hasanvand Mohammad Ali Ahmadi reza mosayebi behbahani Research Institute of Petroleum Industry(RIPI) TehranIran Department of Petroleum Engineering Ahwaz Faculty of Petroleum EngineeringPetroleum University of TechnologyAhwazIran Department of Gas Engineering Ahwaz Faculty of Petroleum EngineeringPetroleum University of TechnologyAhwazIran

Precipitation of heavy hydrocarbon components such as Wax and Asphaltenes are one of the most challenging issues in oil production *** associated complications extend from the reservoir to refineries and petrochemical *** is most destructive when the affected areas are hard to reach,for example the wellbore of producing *** work demonstrates the effect of adjusting choke valve sizes on thermodynamic parameters of fluid flowing in a vertical *** simulation results revealed optimum choke valve sizes that could keep producing vertical wells away from Asphaltene *** results of this study were implemented on a well in Darquin Reservoir that had been experiencing asphaltene *** analysis of reservoir fluid,Asphaltene tests and thermodynamic simulations of well column were carried out and the most appropriate size of choke valve was *** replacing the well's original choke valve with the suggested choke valve,the Asphaltene precipitation problem diminished.

关键词： Asphaltene precipitation Vertical well Choke valve Thermodynamic parameters Well column

Developing grey-box model to diagnose asphaltene stability in crude oils: Application of refractive index

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Petroleum 2016年第4期2卷 369-380页

作者： Mahdi Zeinali Hasanvand Mohammad Ali Ahmadi reza mosayebi behbahani Farzaneh Feyzi Department of Chemical Engineering Ahwaz Faculty of Petroleum EngineeringPetroleum University of TechnologyAhwazIran Department of Petroleum Engineering Ahwaz Faculty of Petroleum EngineeringPetroleum University of TechnologyAhwazIran Department of Chemical Engineering Iran University of Science and TechnologyTehranIran

Asphaltene precipitation can cause serious problems in petroleum industry while diagnosing the asphaltene stability conditions in crude oil system is still a challenge and has been subject of many *** monitor and diagnose asphaltene stability,high performance intelligent approaches based bio-inspired science like artificial neural network which have been optimized by various optimization techniques have been carried *** main purpose of the implemented optimization algorithms is to decide high accurate interconnected weights of proposed neural network *** proposed intelligent approaches are examined by using extensive experimental data reported in open ***,to highlight robustness and precision of the addressed approaches,two different regression models have been developed and results obtained from the aforementioned intelligent models and regression approaches are compared with the corresponding refractive index data measured in *** on the results,hybrid of genetic algorithm and particle swarm optimization have high performance and average relative absolute deviation between the model outputs and the relevant experimental data was found to be less than 0.2%.Routs from this work indicate that implication of HGAPSO-ANN in monitoring refractive index can lead to more reliable estimation of addressed issue which can lead to design of more reliable phase behavior simulation and further plans of oil production.

关键词： Asphaltene Refractive index Stability Evolutionary algorithm Neural network

Effect of synthesis solution pH of Co/γ-Al_2O_3 catalyst on its catalytic properties for methane conversion to syngas

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燃料化学学报 2018年第3期46卷 311-318页

作者： Amir mosayebi reza Abedini Department of Chemical Engineering Tafresh University Faculty of Chemical Engineering Babol Noshirvani University of Technology

The cobalt nanoparticles over γ-Al_2O_3 support were prepared via chemical reduction of CoCl_2·6H_2O using NaBH_4 with various values of pH in the range of 11. 92-13. 80. Synthesized catalysts were studied through X-ray diffraction( XRD),N_2 adsorption/desorption( BET),H_2-temperature programmed reduction( H_2-TPR),H_2-chemisorption,O_2 pulse titration and temperature programmed oxidation( TPO) methods. Obtained results exhibited the synthesis solution pH showed a significant influence on the activity and selectivity in partial oxidation of methane reaction. The methane conversion,CO selectivity and H_2 yield were enhanced by increasing of the synthesis solution pH. Compared to other catalysts,the catalyst that synthesized at pH of 13.80,showed a superior ability in syngas production with a H_2/CO ratio of near 2 and also a proper stability against deactivation during the partial oxidation of methane.

关键词：部分氧化 Co/-Al 2 O 3 nanoparticles 选择 pH 价值

Energy spectrum of multi-radiation of X-rays in a low energy Mather-type plasma focus device

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Chinese Physics B 2014年第6期23卷 375-380页

作者： Farzin M.Aghamir reza A.behbahani Department of Physics University of Tehran

The multi-radiation of X-rays was investigated with special attention to their energy spectrum in a Mather-type plasma focus device （operated with argon gas）. The analysis is based on the effect of anomalous resistances. To study the energy spectrum, a four-channel diode X-ray spectrometer was used along with a special set of filters. The filters were suitable for detection of medium range X-rays as well as hard X-rays with energy exceeding 30 keV. The results indicate that the anomalous resistivity effect during the post pinch phase may cause multi-radiation of X-rays with a total duration of 300 ± 50 ns. The significant contribution of Cu-Kα was due to the medium range X-rays, nonetheless, hard X-rays with energies greater than 15 keV also participate in the process. The total emitted X-ray energy in the forms of Cu-K and Cu-K/3 was around 0.14 ± 0.02 （J/Sr） and 0.04 ±0.01 （J/Sr）, respectively. The total energy of the emitted hard X-ray （〉 15 keV） was around 0.12± 0.02 （J/Sr）.

关键词： Mather-type plasma focus device hard X-rays multi-radiation tube multiple voltage peaks,anomalous resistances

Effect of TiO2 loading on the morphology and CO2/CH4 separation performance of PEBAX-based membranes

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Frontiers of Chemical Science and Engineering 2019年第3期13卷 517-530页

作者： Navid Azizi Mojgan Isanejad Toraj Mohammadi reza M. behbahani Research and Technology Center of Membrane Processes Chemical Engineering DepartmentIran University o f Science and Technology (IUST)NarmakTehranIran Gas Engineering Department Petroleum University of TechnologyAhwazIran

Membranes have attracted much attention as economical methods for industrial chemical processes. The effects of the titanium dioxide nanoparticle load on the morphology and CO2/CH4 separation performance of poly (ether-block-amide)(PEBAX-1657) mixed matrix membranes (MMMs) were investigated from pressures of 3-12 bar and temperatures of 30℃-60℃. The PEBAX membranes were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, thermal gravimetric analysis, atomic force microscopy and tensile strength analysis. The incorporation of TiO2 nanoparticles into the polymeric MMMs improved the CO2/CH4 gas separation performance (both the permeability and selectivity) of the membranes. The CO2 permeability and ideal CO2/CH4 selectivity values of the nanocomposite membrane loaded with 8 wt-% TiO2 were 172.32 Barrer and 24.79, respectively whereas those of the neat membrane were 129.87 Barrer and 21.39, respectively.

关键词： mixed matrix membrane TiO2 nanoparticles PEBAX-1657 C02/CH4 separation

Sand mining disturbances and their effects on the diversity of arbuscular mycorrhizal fungi in a riparian forest of Iran

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Journal of Arid Land 2017年第6期9卷 837-849页

作者： Sareh MORADI behbahani Mostafa MORADI reza BASIRI Javad MIRZAEI Department of Forestry Faculty of Natural Resources and Environment B ehbahan Khatam A1-Anbia University of Technology Behbahan *** Iran Department of Forest Science Faculty of Agriculture Ilam University Ilam 69315516 Iran

The major objective of this study was to evaluate the effects of sand mining disturbances on the diversity of arbuscular mycorrhizal fungi（AMF）. In addition, the proportional changes in the diversity of AMF to the distances from riverbanks were assessed. For this purpose, the riparian forest of the Maroon River, Iran was divided into three locations with a 200-meter wide zone in between. Thus, the locations studied were named Distance I（riverbank）, Distance II（intermediate）, and Distance III（farthest from riverbank）. In each of these distances, 10 Tamarix arceuthoides and Populus euphratica of each species were randomly selected. At the same time, soil and root samples were collected from the rhizosphere of the tree species studied. Results indicated that totally 13 AMF species were observed in T. arceuthoides and 19 AMF species were recorded in P. euphratica rhizosphere belonging to 6 genera and 6 families. In these AMF species, Glomus segmentatum, G. geosporum, G. rubiforme, G. nanolumen, G. spinuliferum, Claroideoglomus drummondii, Gigaspora gigantea and Acaulospora paulinae appeared only in P. euphratica rhizosphere, while G. multiforum and Claroideoglomus claroideum were observed only in T. arceuthoides rhizosphere. Moreover, Distance II had the least AMF species both in T. arceuthoides and in P. euphratica rhizospheres, and also the least spore density and root colonization rate. Our results are important in that they provide a list of resistant AMF species that could be used in the conservation of biodiversity.

关键词： arbuscular mycorrhizal disturbance riparian forest sand mining Maroon River

Calibration and validation of a new time-based surrogate safety measure using fuzzy inference system

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Journal of Traffic and Transportation Engineering(English Edition) 2016年第1期3卷 51-58页

作者： Navid Nadimi Hamid behbahani Hamid reza Shahbazi School of Civil Engineering Iran University of Science and TechnologyTehranIran Power Electrical Faculty Shahid Rajaee Teacher Training UniuersityTehranIran

Surrogate safety measures （SSM） are suitable tools to detect dangerous situations. These indicators can be applied as a warning strategy in collision avoidance systems （CAS）. Timeto-collision （TTC） and post-encroachment time （PET） are two important time-based SSM that identify the probability of a rear-end collision. TIC refers to the imminent danger, and PET implies the potential danger. However, sometimes the results from each indicator are inconsistent. An appropriate warning strategy for CAS can be developed using a new index that combines the properties of both TTC and PET. For this purpose, a new mixed index （MI） is proposed. In order to develop this MI, three main microscopic parameters, clearance, speed and the relative speed, are simultaneously applied to the leading vehicle. To cali- brate MI, based on a fuzzy inference system （FIS）, a value would be determined by a combination of TTC and PET at each instant and then by regression analysis the model parameters would be determined. Finally, MI, TIC and PET values for real car-following scenarios on the 1-80 freeway are determined and compared. The results show that MI may be more suitable in detecting the rear-end collision risk within the proper time and with less errors.

关键词： Surrogate safety measureTime-to-collisionPost-encroachment timeFuzzy inference system

Effects of root,shoot,leaf and seed extracts of seven Artemisia species on HIV-1 replication and CD4 expression

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Journal of Coastal Life Medicine 2015年第12期 996-999页

作者： Hassan Mohabatkar Mandana behbahani Mohammad reza Rahimi Nejad Department of Biotechnology Faculty of Advanced Sciences and TechnologiesUniversity of IsfahanIsfahan 81746-73441Iran Faculty of Science University of IsfahanIsfahan 81746-73441Iran

Objective:To investigate the effects of flower,leaf,shoot and root extracts of seven Artemisia species on peripheral blood mononuclear cells(PBMCs)toxicity and HIV-1 ***:The studied Artemisia species were Artemisia absinthium,Artemisia khorasanica,Artemisia deserti,Artemisia fragrans,Artemisia aucheri,Artemisia sieberi and Artemisia *** activity of these plant extracts on HIV-1 replication and CD4 expression was performed by HIV-1 p24 antigen kit and flow cytometry ***:The results demonstrated that flower extracts of all species increased PBMCs number more than shoot,leaf and root ***,the frequency of CD4 expression in PBMC was not increased in the presence of all flower *** flower extracts of all species had inhibitory effect on HIV-1 ***:In conclusion,the results demonstrated that flower extracts of Artemisia species are good candidates for further studies as anticancer agents.

关键词： Artemisia HIV-1 CD4 PBMC Antiviral activity

Clinical, virologic and phylogenetic features of hepatitis B infection in Iranian patients

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World Journal of Gastroenterology 2008年第35期14卷 5448-5453页

作者： Golnaz Bahramali Majid Sadeghizadeh Samad Amini-Bavil-Olyaee Seyed-Moayed Alavian Abbas Behzad-behbahani Ahmad Adeli Mohammad-reza Aghasadeghi Safieh Amini Fereidoun Mahboudi Department of Genetics Faculty of Basic SciencesTarbiat Modares UniversityTehran 14115-175Iran Biotechnology Department Pasteur Institute of IranTehran 13164IranMohammad-Reza AghasadeghiSafieh AminiHepatitis and HIV DepartmentPasteur Institute of IranTehran 13164Iran Baqiyatallah Research Center for Gastroenterology and Liver Diseases Tehran Hepatitis CenterTehran 14155-3651Iran Medical Technology Research Center School of Paramedical SciencesShiraz University of Medical SciencesShiraz ***Iran Biotechnology Department Pasteur Institute of IranTehran 13164Iran Hepatitis and HIV Department Pasteur Institute of IranTehran 13164Iran

AIM： To characterize the clinical, serologic and virologic features of hepatitis B virus （HBV） infection in Iranian patients with different stages of liver disease.METHODS： Sixty two patients comprising of 12 inactive carriers, 30 chronic hepatitis patients, 13 patients with liver cirrhosis and 7 patients with hepatocellular carcinoma （HCC） were enrolled in the study. The HBV S, C and basal core promoter （BCP） regions were amplified and sequenced, and the clinical, serologic, phylogenetic and virologic characteristics were investigated.RESULTS： The study group consisted of 16 HBeAgpositive and 46 HBeAg-negative patients. Anti-HBepositive patients were older and had higher levels of ALT, ASL and bilirubin compared to HBeAg-positive patients. Phylogenetic analysis revealed that all patients were infected with genotype D （mostly ayw2）. The G1896A precore （PC） mutant was detected in 58.1% patients. HBeAg-negative patients showed a higher rate of PC mutant compared to HBeAg-positive patients （2,2 = 9.682, P = 0.003）. The majority of patients with HCC were HBeAg-negative and were infected with PC mutant variants. There was no significant difference in the occurrence of BCP mutation between the two groups, while the rate of BCP plus PC mutants was higher in HBeAg-negative patients （2,2 = 4.308, P = 0.04）. In the HBV S region, the genetic variability was low, and the marked substitution was P120T/S, with a rate of 9.7% （n = 6）.CONCLUSION： In conclusion, HBV/D is the predominant genotype in Iran, and the nucleotide variability in the BCP and PC regions may play a role in HBV disease outcome in HBeAg-negative patients.

关键词： Hepatitis B virus Clinical and virologic features Genetic variability Phylogenetic analysis