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Experimental study on asphaltene precipitation induced by CO_2 flooding

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Petroleum Science 2014年第1期11卷 174-180页

作者： DONG Zhao-xia WANG Jun LIU Gang LIN Mei-qin LI Ming-yuan Enhanced Oil Recovery Research Institute China University of Petroleum Beijing Key Laboratory for Greenhouse Gas Storage and Enhanced Oil Recovery Key Laboratory of Enhanced Oil Recovery CNPC

The effects of CO2 pressure,temperature and concentration on asphaltene precipitation induced by CO2 were studied using a high-pressure vessel,interfacial tensiometer,Fourier transform infrared （FTIR） and drill core displacement experimental *** results indicated that the content of asphaltene in crude oil decreased,and the interfacial tension between a model oil and distilled water increased,with an increase of CO2 pressure,decrease of temperature and increase of molar ratio of CO2 to crude oil when CO2 contacted crude oil in the high pressure *** content of asphaltene in sweepout oil and the permeability of test cores both also decreased with an increase of CO2 flooding *** main reason for changes in content of asphaltene in crude oil,in interfacial tension between model oil and distilled water and in the permeability of the test core is the precipitation of asphaltene which is an interfacially active substance in crude *** of asphaltene also blocks pores in the drill core which decreases the permeability.

关键词： CO2 flooding asphaltene precipitation oil-water interfacial tension core permeability

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

Prediction of asphaltene precipitation using support vector regression tuned with genetic algorithms

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Petroleum 2016年第3期2卷 301-306页

作者： Mohammad Ghorbani Ghasem Zargar Hooshang Jazayeri-Rad Department of Petroleum Engineering Petroleum University of Technology(PUT)AhwazIran Department of Instrumentation and Automation Petroleum University of Technology(PUT)AhwazIran

Due to the severe and costly problems caused by asphaltene precipitation in petroleum industry,developing a quick and accurate model,to predict the asphaltene precipitation under different conditions,seems *** this study,a new model,namely genetic algorithm e support vector regression(GA-SVR)is proposed,which is applied to predict the amount of asphaltene *** is used to select the best optimal values of SVR parameters and kernel parameter,simultaneously,to increase the generalization performance of the *** GA-SVR model is trained and tested on the experimental data sets reported in *** performance of the GASVR model is compared with two scaling equation models,using statistical error measures and graphical *** results show that the prediction performance of the proposed model,is highly reliable and satisfactory.

关键词： asphaltene precipitation Prediction Support Vector Regression(SVR) Genetic Algorithm(GA) Parameter optimization

Effects of experimental conditions on the molecular composition of maltenes and asphaltenes derived from oilsands bitumen: Characterized by negative-ion ESI FT-ICR MS

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Science China Chemistry 2013年第7期56卷 863-873页

作者： WANG LiTao HE Chen LIU Yang ZHAO SuoQi ZHANG YaHe XU ChunMing CHUNG Keng H. SHI Quan State Key Laboratory of Heavy Oil Processing China University of Petroleum Well Resources Inc.

A vacuum topped Canadian oilsands bitumen （VTB） was subjected to solvent precipitation and subsequently characterized by elemental analysis, gel permeation chromatograph （GPC）, IH-NMR spectroscopy and negative-ion electrospray ionization （ESI） Fourier transform ion cyclotron resonance mass spectrometry （FT-ICR MS）. Effects of experimental conditions such as solvent types （n-Cs, n-C6, and n-C7）, solvent purity, and solvent washing time on asphaltenes yields, bulk composition, and molecular composition of detectable heteroatom compounds in ESI source were determined. Elemental nitrogen and sulfur were enriched in asphaltenes while elemental oxygen had comparable content in maltenes and asphaltenes. Molecular compo- sition of asphaltenes varies with separation conditions. The N1 and O1 species identified by ESI FT-ICR MS were enriched in maltenes. The 02 species exhibited two different double bond equivalents （DBE） distributions and solubility in normal paraffin solvents, indicating two types of molecular structures. Multi oxygen atom containing compounds mainly detected in asphal- tenes. Compound class distributions are similar for maltenes derived from n-Cs, n-C6, and n-C7 , as well as for asphaltenes. The cyclic paraffin impurities in normal paraffin solvents had a significant influence on asphaltenes yields and heteroatom molecu- lar composition. A portion of neutral N1 species and acidic 02 species adsorbed on asphaltenes could be dissolved by increas- ing washing time. Cautions should be exercised when interpreting the properties and composition of asphaltenes obtained with different experimental conditions.

关键词： asphaltene precipitation experimental conditions bulk properties molecular composition ESI FT-ICR MS