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1. Modeling the characterization of the plus fractions for different petroleum fluids with an improved six-coefficient splitting method | |||
LI Changjun,PENG Yang | |||
Energy Science and Technology 23 May 2016 | |||
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Abstract:Petroleum fluids such as the gas condensate and crude oil system often contain large concentrations of high molecular constituents. When determining the physicochemical properties and phase behavior of petroleum fluids by equations of state, the hydrocarbon heavy fractions should be properly characterized. Although advanced gas chromatographs can be used to analyze the fluid composition, the simple structure molar distribution models are still convenient to characterize the heavy hydrocarbon fractions so that time and money will be saved. To accurately split the plus fraction into a series of single carbon numbers (SCN), generating the mole fraction and the respective molecular weight, an improved six-coefficient splitting model is presented in this study. The model is based on the relationships between the six-coefficient molar distribution function, experimental mole fraction, average molecular weight and SCN data acquired from the literature. The presented model was validated by using the experimental extended fluid component of 20 different petroleum fluids which cover gas condensates and crude oils. The comparison results of the model and four other splitting approaches as Katz method, Pedersen et al. method, Ahmed et al. method and Hosein et al. method, indicate that the improved method is more practical and appropriate for extending different types of petroleum fluids. | |||
TO cite this article:LI Changjun,PENG Yang. Modeling the characterization of the plus fractions for different petroleum fluids with an improved six-coefficient splitting method[OL].[23 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4690689 |
2. Predicting the compressibility factor for gas condensate samples using a thermodynamic model with a three-parameter cubic equation of state | |||
LI Changjun,PENG Yang | |||
Energy Science and Technology 23 May 2016 | |||
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Abstract:The gas compressibility factor as an essential thermodynamic parameter is often used to analyze PVT phase behavior in natural gas industry. To accurately predicate it for different gas condensate samples, a data base containing 916 data sets covering a wide range of experimental conditions is employed to establish and test the thermodynamic prediction model based on a three-parameter cubic equation of sate (EoS). The presented model which based on a modified PT EoS combines with Elliot-Daubert binary interaction coefficients correlation, two-parameter plus fraction splitting model and Hosseinifar-Jamshidi characterization method outperforms conventional empirical correlations with three mixing rules. Statistical error analysis shows that it is superior to ten empirical correlations with average absolute relative errors of 1.45% and coefficient of determination of 0.989. The proposed thermodymic model is efficient and practical for predicting the compressibility factor for various gas condensates. | |||
TO cite this article:LI Changjun,PENG Yang. Predicting the compressibility factor for gas condensate samples using a thermodynamic model with a three-parameter cubic equation of state[OL].[23 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4690165 |
3. Preparation of Coal Tar Pitch-based Mesoporous Activated Carbon and its Adsorption of Benzothiophene and Dibenzothiophene | |||
Jianghua Qiu,Guanghui Wang,Yuncheng Bao | |||
Energy Science and Technology 17 May 2016 | |||
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Abstract:Mesoporous activated carbons (MCs) were prepared from coal tar pitch using nanosized silica as the hard template. Effects of imprinting temperature, mixing ratio of pitch/silica and carbonization temperature on the textural structure and the adsorption of benzothiophene (BT) and dibenzothiophene (DBT) in the model fuel oil were studied. The pore structure and surface topography of the MC samples were characterized by N2 adsorption and SEM. The results show that the main pore size distribution of MCs is close to the size of the template used. With the decrease of mpitch/msilica ratio from 3:1 to 1:4, the specific surface area increased obviously, whereas the mesopore portion decreased. When the imprinting temperature is 320 ℃, mpitch/msilica ratio is 1:3 and carbonized temperature is 800 ℃, a best MC with the specific surface area of 262 m2/g and the mesoporous rate of 72.1% is produced. The mesoporous structure of the activated carbons is advantageous for the adsorption of BT and DBT, and the increase of the mesopore portion is more favorable for the adsorption of DBT. | |||
TO cite this article:Jianghua Qiu,Guanghui Wang,Yuncheng Bao. Preparation of Coal Tar Pitch-based Mesoporous Activated Carbon and its Adsorption of Benzothiophene and Dibenzothiophene[OL].[17 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4689951 |
4. Local Composition Model for the Phase Equilibrium, Phase Densities and Surface Tensions of Hydrocarbon-Hydrocarbon and Hydrocarbon-CO2 Mixtures | |||
ZHU Junyue,DUAN Yuanyuan,YANG Zhen | |||
Energy Science and Technology 21 October 2013 | |||
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Abstract:Phase equilibrium, phase densities and surface tensions of hydrcaorbon-hydrocarbon (HC-HC) and hydrocarbon-CO2 (HC-CO2) vapor-liquid system have great importance in separation, purification and dissolution processes. In this work, a local composition model was introduced into the volume translated Peng-Robinson(VTPR) equation of state(EOS) to calculate the phase equilibrium and phase densities. And then the local composition combined with VTPR EOS was used to predict the surface tensions based on the gradient theory. The results show that the introduction of the local composition model can achieve accurate calculation of phase equilibrium, phase densities and surface tensions for binary HC-HC and HC-CO2 mixtures. | |||
TO cite this article:ZHU Junyue,DUAN Yuanyuan,YANG Zhen. Local Composition Model for the Phase Equilibrium, Phase Densities and Surface Tensions of Hydrocarbon-Hydrocarbon and Hydrocarbon-CO2 Mixtures[OL].[21 October 2013] http://en.paper.edu.cn/en_releasepaper/content/4565233 |
5. Study on water saturation in oil-water fluid flow area | |||
Liu Zhibin,Liu Haohan | |||
Energy Science and Technology 01 December 2011 | |||
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Abstract:Studying on water saturation distribution in oil-water fluid flow area is meaningful to the high, stabilized production and improvement of ultimate recovery. In this paper, by introducing relational expression between relative permeability and water saturation to the fractional flow equation, we get an expression between water cut and water saturation; By combining differentiation of water cut to the expression, we get a three dimensional (3D) equation between water saturation, distance and time; After expanding it with Taylor expansion and solving it with Vieta's Theorem, we find the distribution of water saturation related to time and distance in oil-water fluid flow area; By applying this formula to certain sandstone reservoir in China, we get the water saturation distribution in 100 days and 200 days and drew corresponding figures. | |||
TO cite this article:Liu Zhibin,Liu Haohan. Study on water saturation in oil-water fluid flow area[OL].[ 1 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4452311 |
6. New Gas Drive Analysis Method | |||
Liu Haohan | |||
Energy Science and Technology 23 February 2011 | |||
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Abstract:For gas reservoir driving, the main gas driving force , the dynamic changes of gas reservoir and the interreaction between gas reservoir and its surrounding water area in each development phase should be considered. The dynamic change of gas reservoir means the changes of gas reservoir pressure and PORV of gas storage; By introducing the least-square method to the material balance equation of gas reservoir and considering the liquid expansion and decreased pore volume caused by the decreased pressure and combining the liquid state equation and the elastic medium state equation , a new method to analyze the gas reservoir driving has been established, and relative new calculating formula of degree of reserve recovery, effective compressibility, relative pressure coefficient, cumulative gas production and geologic reserve of gas reservoir have been produced; This new method lays a theoretical foundation for the traditional formation pressure method, the law of water cutting volume factor and the Havlena-Odeh method, and it can be applied to the driving analysis of normal gas reservoir, abnormally pressured gas reservoir and condensate gas reservoir; By putting this new method into the Anderson 'L' gas reservoir: An abnormally pressured gas reservoir in south Texas of America, we get good analyzing results. | |||
TO cite this article:Liu Haohan. New Gas Drive Analysis Method[OL].[23 February 2011] http://en.paper.edu.cn/en_releasepaper/content/4411942 |
7. One-layer-only molecular deposition filming self-assemblies: a breakthrough in enhanced oil recovery | |||
Gao Manglai,Gu Zheng | |||
Energy Science and Technology 29 December 2010 | |||
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Abstract:In recent decades, the properties and applications of multilayer films have been widely studied. However there has been relatively little research or consideration of other forms of deposition films. This paper introduces a class of unique molecular deposition filming self-assemblies, which we call "one-layer-only" molecular deposition films in order to distinguish them from multilayer films and ordinary monolayers. These one-layer-only molecular deposition filming self-assemblies have distinctive qualities, which will be discussed in detail below, and are constructed with just a single-layer film each, via electrostatic attraction between quaternary ammonium salts and negatively charged substrates. The impressive effects of these one-layer-only molecular deposition filming self-assemblies have already been demonstrated in enhanced oil recovery in many oilfields across China. After describing the unique method of oil displacement and detailing various experiments using this method and their results, the paper will consider the alternative applications of the one-layer-only molecular deposition filming self-assemblies in the oilfield industry as well as the surface modification of clay. The significance of this new method is not just the efficiency with which it produces higher amounts of oil displacement and the economic benefits that result, but also its profound social significance and its potential to be applied to other subject areas. After exploring these possibilities, the paper concludes by examining the current limitations of the one-layer-only molecular deposition filming self-assemblies, the opportunities for their wider application and the great potential for their use and development in the future. | |||
TO cite this article:Gao Manglai,Gu Zheng. One-layer-only molecular deposition filming self-assemblies: a breakthrough in enhanced oil recovery[OL].[29 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4402095 |
8. Modeling Non-aqueous Phase Liquid Displacement Process | |||
YANG Zhen-qing,SHAO Chang-jin,QIU Chao | |||
Energy Science and Technology 22 January 2007 | |||
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Abstract:A pore-network model physically based on pore level multiphase flow is used to study the ware-NAPL displacement process , especially on the effects of the wettability,the water-NAPL interfacial tension, the fraction of NAPL-wet pores,and the initial water saturation for the diaplacement .The computed data show that, with the wettability of the mineralogy surface changes from strongly water-wet to NAPL-wet, the capillary pressure and the NAPL relative permeability gradually decrease,while the the water-NAPL interfacial tension has little effect on relative permeability to water ,but the initial water saturation has a profound effect on the water and NAPL relative permeability. The analysis result may help to understand the micro-structure displacement process of non-aqueous phase liquid and to provide the theoretical foundation for NAPL transfer controlling . | |||
TO cite this article:YANG Zhen-qing,SHAO Chang-jin,QIU Chao. Modeling Non-aqueous Phase Liquid Displacement Process[J].Petroleum Scinece,2007,4(3):40~46. |
9. Preparation and Research of EOR used Microgel with High Resistance to Temperature and Salinity | |||
Li Fangxing ,Sun Ruimin,Rui Jiaming,Chen Shengnan,Yang Xiaoying ,Jiang Ping,Liu Fuha,Liu Weidong | |||
Energy Science and Technology 13 April 2006 | |||
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Abstract:Polyacrylamide (PAM) microgel with low degree of cross-linking was synthesized in this study. Properties such as its water solution viscosity and EOR (enhanced oil recovery) were characterized. The influence of concentration and degree of cross-linking on EOR of the PAM microgel solution was studied. From these results, it is stated that this kind of microgel can improve the resistance to salinity and temperature, and can give an EOR much higher than partially hydrolyzed polyacrylamide (HPAM) solution. In the condition of a salinity of 80000mg/L (Ca2+, Mg2+, Na+), at 45℃ the microgel solution with a degree of cross-linking of 11.4% and a concentration of 1.5‰ have almost the same viscosity as compared with its fresh water solution at room temperature and gives a 25% improving sweep efficiency in laboratory core flooding test. This kind of microgel solution is very useful in chemical enhanced oil recovery process and has potential of industrial utilization. | |||
TO cite this article:Li Fangxing ,Sun Ruimin,Rui Jiaming, et al. Preparation and Research of EOR used Microgel with High Resistance to Temperature and Salinity[OL].[13 April 2006] http://en.paper.edu.cn/en_releasepaper/content/6204 |
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