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Kinetic study of methane hydrate formation in the presence of carbon nanostructures

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Petroleum Science 2019年第3期16卷 657-668页

作者： Saeid Abedi-Farizhendi Mina Iranshahi Abolfazl mohammadi Mehrdad Manteghian Amir h. mohammadi Faculty of Chemical Engineering Tarbiat Modares University Tehran Iran Department of Petroleum Engineering South Tehran Branch Islamic Azad University Tehran Iran Department of Chemical Engineering University of Bojnord Bojnord Iran Institut de Recherche en Genie Chimique et Petrolier (IRGCP) Paris Cedex France Discipline of Chemical Engineering School of Engineering University of KwaZulu-Natal Howard College Campus King George V Avenue Durban 4041 South Africa

The effect of synthesized nanostructures,including graphene oxide,chemically reduced graphene oxide with sodium dodecyl sulfate(SDS),chemically reduced graphene oxide with polyvinylpyrrolidone,and multi-walled carbon nanotubes,on the kinetics of methane hydrate formation was investigated in this *** experiments were carried out at a pressure of 4.5 MPa and a temperature of 0 ℃ in a batch *** adding nanostructures,the induction time decreases,and the shortest induction time appeares at certain concentrations of reduced graphene oxide with SDS and graphene oxide,that is,at a concentration of 360 ppm for reduced graphene oxide with SDS and 180 ppm for graphene oxide,with a 98% decrease in induction time compared to that in pure ***,utilization of carbon nanostructures increases the amount and the rate of methane consumed during the hydrate formation *** of multi-walled carbon nanotubes with a concentration of 90 ppm showes the highest amount of methane *** amount of methane consumption increases by 173% in comparison with that in pure *** addition of carbon nanostructures does not change the storage capacity of methane hydrate in the hydrate formation process,while the percentage of water conversion to hydrate in the presence of carbon nanotubes increases considerably,the greatest value of which occurres at a 90 ppm concentration of carbon nanotubes,that is,a 253% increase in the presence of carbon nanotubes compared to that of pure water.

关键词： Clathrate hydrate Kinetics Carbon nanostructures Graphene oxide SDS PVP

An experimental study of the synergistic effects of BMIM-BF_4,BMIM-DCA and TEACI aqueous solutions on methane hydrate formation

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Petroleum Science 2019年第2期16卷 409-416页

作者： Ali Rasoolzadeh Jafar Javanmardi Amir h.mohammadi Department of Chemical Engineering Shiraz University of Technology Institut de Recherche en Genie Chimique et Petrolier (IRGCP) Discipline of Chemical Engineering School of Engineering University of KwaZulu-Natal Howard College Campus

In this work, the effects of three ionic liquids(ILs), namely, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium dicyanamide and tetraethyl-ammonium chloride, on methane hydrate formation and dissociation kinetic parameters were studied. The kinetic parameters including the initial rate of hydrate formation, hydrate stability at atmospheric pressure and hydrate storage capacity were evaluated. The experimental measurements were performed in an initial pressure range of 3.5-7.1 MPa. It was found that both of ILs with imidazolium-based cation increase the initial methane hydrate formation rate while the IL with ammonium-based cation leads to a decrease in the initial methane hydrate formation rate. It was also interpreted from the results that all of the three studied ILs decrease methane hydrate stability at atmospheric pressure and increase methane hydrate storage capacity. Finally, both of ILs with imidazolium-based cations were found to have higher impacts on decreasing hydrate stability at atmospheric pressure and increasing the methane hydrate storage capacity than the applied IL with ammonium-based cation.

关键词： Storage capacity Gas hydrate Initial rate Ionic liquids Natural gas

Predicting Soil Moisture Characteristic Curves from Continuous Particle-Size Distribution Data

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Pedosphere 2013年第1期23卷 70-80页

作者： M.h.mohammadi F.MESKINI-VIShKAEE Department of Soil Science Faculty of Agriculture University of Zanjan

Soil moisture characteristic curve （SMC） is a fundamental soil property and its direct measurement is tedious and time consuming. Therefore, various indirect methods have been developed to predict SMC from particle-size distribution （PSD）. however, the majority of these methods often yield intermittent SMC data because they involve estimating individual SMC points. The objectives of this study were 1） to develop a procedure to predict continuous SMC from a limited number of experimental PSD data points and 2） to evaluate model predictions through comparisons with measured values. In this study, an approach that allowed predicting SMC from the knowledge of PSD, parameterized by means of the closed-form van Genuchten model （VG）, was used. Through using mohammadi and Vanclooster （MV） model, the parameters obtained from fitting of VG to PSD data were applied to predict SMC curves. Since the residual water content （Or） could not be obtained through fitting of VG-MV integrated model to PSD data, we also examined and compared four different methods estimating 0r. Results showed that the proposed equation （MV-VG integrated model） provided an excellent fit to all the PSD data and the model could adequately predict SMC as measured in forty-two soils sampled from different regions of Iran. For all soils, the method in which Or Was obtained through parameter optimization procedure provided the best overall predictions of SMC. The two methods estimating Or with Campbell and Shiozawa （CS） model resulted in less accuracy than the optimization procedure. Furthermore, the proposed model underestimated the moisture content in the dry range of SMC when the value of 0r was assumed to equal zero. 0r could be attributed to the incomplete desorption of water coated on soil particles and the accurate estimation of 0r was critical in prediction of SMC, especially for fine-textured soils at high suction heads. It could be concluded that the advantages of our approach were the continuity, rob

关键词： fine-textured soils modeling residual water content soil hydraulic properties van Genuchten model

Modeling viscosity of methane,nitrogen,and hydrocarbon gas mixtures at ultra-high pressures and temperatures using group method of data handling and gene expression programming techniques

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Chinese Journal of Chemical Engineering 2021年第4期34卷 431-445页

作者： Farzaneh Rezaei Saeed Jafari Abdolhossein hemmati-Sarapardeh Amir h.mohammadi Department of Petroleum Engineering Shahid Bahonar University of KermanKermanIran Institute of Research and Development Duy Tan UniversityDa Nang 550000Vietnam Faculty of Environment and Chemical Engineering Duy Tan UniversityDa Nang 550000Vietnam Institut de Recherche en Genie Chimique et Petrolier(IRGCP) Paris CedexFrance Discipline of Chemical Engineering School of EngineeringUniversity of KwaZulu-NatalHoward College CampusKing George V AvenueDurban 4041South Africa

Accurate gas viscosity determination is an important issue in the oil and gas *** approaches for gas viscosity measurement are timeconsuming,expensive and hardly possible at high pressures and high temperatures(hPhT).In this study,a number of correlations were developed to estimate gas viscosity by the use of group method of data handling(GMDh)type neural network and gene expression programming(GEP)techniques using a large data set containing more than 3000 experimental data points for methane,nitrogen,and hydrocarbon gas *** is worth mentioning that unlike many of viscosity correlations,the proposed ones in this study could compute gas viscosity at pressures ranging between 34 and 172 MPa and temperatures between 310 and 1300 ***,a comparison was performed between the results of these established models and the results of ten wellknown models reported in the *** absolute relative errors of GMDh models were obtained 4.23%,0.64%,and 0.61%for hydrocarbon gas mixtures,methane,and nitrogen,*** addition,graphical analyses indicate that the GMDh can predict gas viscosity with higher accuracy than GEP at hPhT ***,using leverage technique,valid,suspected and outlier data points were ***,trends of gas viscosity models at different conditions were evaluated.

关键词： Gas Viscosity high pressure high temperature Group method of data handling Gene expression programming

Effect of a synthesized anionic fluorinated surfactant on wettability alteration for chemical treatment of near-wellbore zone in carbonate gas condensate reservoirs

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Petroleum Science 2020年第6期17卷 1655-1668页

作者： Iman Nowrouzi Amir h.mohammadi Abbas Khaksar Manshad Discipline of Chemical Engineering School of EngineeringUniversity of KwaZulu-NatalHoward College CampusKing George V AvenueDurban 4041South Africa Department of Petroleum Engineering Abadan Faculty of Petroleum EngineeringPetroleum University of Technology(PUT)AbadanIran Department of Petroleum Engineering Faculty of EngineeringSoran UniversitySoranKurdistan RegionIraq

The pressure drop during production in the near-wellbore zone of gas condensate reservoirs causes condensate formation in this *** blockage in this area causes an additional pressure drop that weakens the effective parameters of production,such as *** rock wettability alteration to gas-wet through chemical treatment is one of the solutions to produce these condensates and eliminate condensate blockage in the *** this study,an anionic fluorinated surfactant was synthesized and used for chemical treatment and carbonate rock wettability *** synthesized surfactant was characterized by Fourier transform infrared spectroscopy and thermogravimetric ***,using surface tension tests,its critical micelle concentration(CMC)was *** angle experiments on chemically treated sections with surfactant solutions and spontaneous imbibition were performed to investigate the wettability *** adsorption on porous media was calculated using ***,the surfactant foamability was investigated using a Ross-Miles foam *** to the results,the synthesized surfactant has suitable thermal stability for use in gas condensate reservoirs.A CMC of 3500 ppm was obtained for the surfactant based on the surface tension *** angle experiments show the ability of the surfactant to chemical treatment and wettability alteration of carbonate rocks to gas-wet so that at the constant concentration of CMC and at 373 K,the contact angles at treatment times of 30,60,120 and 240 min were obtained 87.94°,93.50°,99.79°and 106.03°,***,this ability varies at different surfactant concentrations and *** foamability test also shows the suitable stability of the foam generated by the surfactant,and a foam half-life time of 13 min was obtained for the surfactant at CMC.

关键词： Condensate blockage Chemical treatment Wettability alteration Gas-wetting Fluorinated surfactant Surface tension

Insights into kinetic inhibition effects of MEG,PVP,and L-tyrosine aqueous solutions on natural gas hydrate formation

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Petroleum Science 2021年第2期18卷 495-508页

作者： Amir Saberi Abdolmohammad Alamdari Ali Rasoolzadeh Amir h.mohammadi Department of Natural Gas Engineering School of Chemical and Petroleum EngineeringShiraz UniversityShiraz71345Iran Department of Process Engineering National Iranian Gas Company(NIGC)South Pars Gas Complex(SPGC)Phases 4&5Bushehr75391/311Iran Discipline of Chemical Engineering School of EngineeringUniversity of KwaZulu-NatalHoward College CampusKing George V AvenueDurban4041South Africa

It is necessary to understand all the prerequisites, which result in gas hydrate formation for safe design and control of a variety of processes in petroleum industry. Thermodynamic hydrate inhibitors (ThIs) are normally used to preclude gas hydrate formation by shifting hydrate stability region to lower temperatures and higher pressures. Sometimes, it is difficult to avoid hydrate formation and hydrates will form anyway. In this situation, kinetic hydrate inhibitors (KhIs) can be used to postpone formation of gas hydrates by retarding hydrate nucleation and growth rate. In this study, two kinetic parameters including natural gas hydrate formation induction time and the rate of gas consumption were experimentally investigated in the presence of monoethylene glycol (MEG), L-tyrosine, and polyvinylpyrrolidone (PVP) at various concentrations in aqueous solutions. Since hydrate formation is a stochastic phenomenon, the repeatability of each kinetic parameter was evaluated several times and the average values for the hydrate formation induction times and the rates of gas consumption are reported. The results indicate that from the view point of hydrate formation induction time, 2 wt% PVP and 20 wt% MEG aqueous solutions have the highest values and are the best choices. It is also interpreted from the results that from the view point of the rate of gas consumption, 20 wt% MEG aqueous solution yields the lowest value and is the best choice. Finally, it is concluded that the combination of PVP and MEG in an aqueous solution has a simultaneous synergistic impact on natural gas hydrate formation induction time and the rate of gas consumption. Furthermore, a semi-empirical model based on chemical kinetic theory is applied to evaluate the hydrate formation induction time data. A good agreement between the experimental and calculated hydrate formation induction time data is observed.

关键词： Gas hydrate Clathrate hydrate Natural gas Kinetic hydrate inhibitor(KhI) Induction time Kinetics

Techno-economic review on storage of petroleum products in abandoned underground salt mines:A case study on underground salt mines of Sardareh region,Garmsar,Iran

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International Journal of Mining Science and Technology 2013年第6期23卷 931-936页

作者： h.mohammadi M.Noroozi M.Eftekhari Department of Mining Engineering Shahrood BranchIslamic Azad University Faculty of Mining Engineering.Petroleum and Geophysics Shahrood University of Technology Department of Mining Engineering.South Tehran Branch Islamic Azad University

During the past few decades,along with creation of new needs,large spaces of underground mines(especially abandoned mines)have found new applications,e.g.,storage of petroleum *** of empty spaces of these mines as hydrocarbons storage facilities decreases the costs of construction of underground spaces,which can be very expensive and *** the other hand,crude oil and other hydrocarbons nowadays are one of the most important factors affecting political and a major part of the domestic economy is achieved through ***,in this paper,a feasibility study has been performed on the application of underground salt mines near the city of Garmsar on the southern edge of Alborz mountains and on the north of the central desert of *** studies of documentaries,field observations and considering technical,geometrical and defensive criterion,the most suitable abandoned underground mine for reutilization as a storage facility is selected and presented.

关键词： Abandoned mines Salt Storage hydrocarbons Garmsar

Numerical approach for enhanced oil recovery with surfactant flooding

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Petroleum 2016年第1期2卷 98-107页

作者： Sadegh Keshtkar Morteza Sabeti Amir h.mohammadi Department of Petroleum Engineering Faculty of Petroleum EngineeringPetroleum University of TechnologyAhwazIran Department of Chemical Engineering Isfahan University of TechnologyIsfahanIran Institut de Recherche en Genie Chimique et Petrolier(IRGCP) Paris CedexFrance Thermodynamics Research Unit School of EngineeringUniversity of KwaZulu-NatalHoward College CampusKing George V AvenueDurban 4041South Africa Departement de Genie des Mines de la Metallurgie et des MateriauxFaculte des Sciences et de GenieUniversite LavalQuebec(QC)G1V 0A6Canada

The remained oil in the reservoir after conventional water-flooding processes,forms a dispersed phase in the form of oil drops which is trapped by capillary forces and is almost about 70%of the original oil in the place(OOIP).To reduce oil residual saturation in laboratory experiments and field projects,surfactant flooding is effective via decreasing the interfacial tension mobility ratio between oil and water *** of the role of design variables,like chemical concentrations,partition coefficient and injection rate in different performance quantities,considering a heterogeneous and multiphase oil reservoir is a critical stage for optimal *** demand for oil production from water-flooded reservoirs has caused an increasing interest in surfactant-polymer(SP)and alkali-surfactant-polymer(ASP).Modeling minimizes the risk of high cost of chemicals by improving our insight of *** the present paper,a surfactant compositional flood model for a three-component(water,petroleum and surfactant),two phase(aqueous and oleic)system is studied.A homogeneous,two-dimensional,isothermal reservoir with no free gas or alkali is *** governing equations are in three categories:the continuity equations for the transport of each component,Darcy's equation for the transport of each phase and other auxiliary *** equations are solved by finite-differences using a procedure implicit in pressure and explicit in *** validation of the model is achieved through comparing the modeling results with CMG simulators and BuckleyeLeverett *** results of modeling showed good agreement with CMG results,and the comparison with BuckleyeLeverett theory is explained according to different *** validation of the model,in order to investigate sensitivity analysis,the effects of system variables(partition coefficient,surface tension,oil viscosity and surface injection concentration)and performance variable(cumulative oil recovery)are

关键词： Surfactant flooding Numerical simulation Finite difference Two phases-three component system Partition coefficient

A dynamic method for experimental assessment of scale inhibitor efficiency in oil recovery process by water flooding

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Petroleum 2019年第3期5卷 303-314页

作者： Jaber Azizi Seyed Reza Shadizadeh Abbas Khaksar Manshad Amir h.mohammadi Department of Petroleum Engineering Abadan Faculty of Petroleum EngineeringPetroleum University of Technology(PUT)Iran Institut de Recherche en Genie Chimique et Petrolier(IRGCP) France Discipline of Chemical Engineering School of EngineeringUniversity of KwaZulu-NatalHoward College Campus4041South Africa

Scale formation due to the mixing of injection water with formation water causes formation damage and reduction in petroleum *** using scale inhibitors,scale formation/scaling could be *** this work,static experiments were performed with rapid controlled precipitation tests,which were undertaken using three different scale inhibitors namely Falat scale inhibitor,Scahib 760 scale inhibitor and Scahib 780 scale *** show that parameters such as temperature and ph have significant effects on scale inhibitor *** this study,at ph of 7.8e9 it was found that an increase in ph can lead to a decrease in SI *** addition,acquired data shows that Falat scale inhibitor is more efficient at 45C but scale inhibitors(Scahib 760,780)have better efficiencies at 25*** tests were performed to find structure deformation and morphology of precipitation crystals,which indicated that scale inhibitor can have various effects on crystal's ***,dynamic tests were performed with coreflood equipment that indicated higher recovery by using the scale *** dynamic tests results show that the recovery factor in the presence of Scahib 760 scale inhibitor is about 58%and breakthrough time is 2099(sec).In the absence of scale inhibitor,the recovery factor is about 52%and breakthrough time is 2720(sec).

关键词： Scale inhibitor Formation damage Scaling index Static test Dynamic test SEM test