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Efficient computation of the compositional model for gas condensate reservoirs

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Communications in Nonlinear Science and Numerical Simulation 2000年第4期5卷 141-146页

作者： Jifu ZHOU, Jiachun LI and Jigen YE (Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China The Research Institute of Petroleum Exploration and Development, Beijing 100083, China) (Received December 2, 2000) Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China Res. Inst. Petrol. Explor./Devmt. Beijing 100083 China

In this paper, a direct method, unsymmetric-pattern multifrontal factorization, for a large sparse system of linear equations is applied in the compositional reservoir model. The good performances of this approach are shown by solving the Poisson equation. And then the numerical module is embedded in the compositional model for simulating X15(3) gas condensate reservoir in KeKeYa gas field, Northwest China. The results of oil/gas reserves, variations of stratum pressure and oil/gas production, etc. are compared with the observation Good agreement comparable to COMP4 model is achieved, suggesting that the present model is both efficient and powerful in compositional reservoir simulations.

关键词： gas condensate reservoir compositional model sparse matrix

Alkyldibenzothiophenes:molecular tracers for filling pathway in oil reservoirs

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Chinese Science Bulletin 2004年第22期49卷 2399-2404页

作者： WANGTieguan HEFaqi LIMeijun HOUYong GUOShuqi KeyLaboratoryofPetroleumAccumulationMechanismoftheMinistryofEducation UniversityofPetroleumBeijing102249China Exploration&ProductionDepartment SINOPECBeijing100029China

Based on the thermodynamic stability and hy- drogen bond mechanisms, alkyldibenzothiophene molecular ratios, 4-/1-MDBT, 2,4-/1,4- and 4,6-/1,4-DMDBT, are used to characterize organic maturity and oil migration, which can act as molecular tracers for the filling orientation and path- way in oil reservoir. The application of aforesaid molecular parameters, in a Neogene sandstone reservoir of the XJ24-3 Oilfield, Zhujiangkou Basin and in an Ordovician carbonate reservoir of Karst pore-fissure-network type in the Tahe Oil- field, Tarim Basin, manifests that those ratios are reliable tracers compared with other molecular ratios, and thus, al- kyldibezothiophene parameters may be used in a wide range of maturity, especially for high- to post-mature oil and se- verely biodegraded oil, both of which are short of effective molecular parameters.

关键词：油罐填充路径烷基联苯基噻吩分子示踪剂热力学稳定性油气储存

Study on design pressure of in-service welding pipes

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Science China(Technological Sciences) 2006年第4期49卷 434-444页

作者： XUE Xiaolong1, ZHU Jiagui2 & SANG Zhifu1 1. College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China 2. Nanjing Yangzi Petrochemical Maintenance and Installation Co. Ltd., Nanjing 210048, China College of Mechanical and Power Engineering Nanjing University of Technology Nanjing Yangzi Petrochemical Maintenance and Installation Co. Ltd.

A method of predicting design pressure and burn-through of in-service welding pipes was established. Temperature distributions of in-service welding under variable parameters were simulated by FEM. The effect of flowing of internal media was regarded as forced convection. Based on the numerical results, design pressure of the pipe can be obtained and burn-through can be predicted. It can be concluded that the design pressure decreases with the increasing of heat input. RSF and design pressure of the pipe increase with the increasing of flow rate. There is a range in which the increase changes greatly. For in-service welding, the range should be considered adequately to determine operating condition optimally. RSF increases with the increasing of pipe wall thickness. While the thickness increases to an extent, RSF shows little increase. Accord- ing to the curves of design pressure versus different parameters, safe working pressure can be achieved.

关键词： in-service welding, heat input, flow rate, pipe wall thickness, design pressure.

Pretreatment of Crude Oil by Ultrasonic-electric United Desalting and Dewatering

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Chinese Journal of Chemical Engineering 2008年第4期16卷 564-569页

作者：叶国祥吕效平彭飞韩萍芳 Institute of Sonochemical Engineering Nanjing University of Technology Nanjing 210009 China

A technology of ultrasonic-electric united desalting and dewatering of crude oil is studied. The ultrasonic setup is designed to form a standing-wave field, which is more efficient for agglomeration of water particles. The desalting and dewatering results of the ultrasonic-electric united process are compared with those of the electric process. For high salt-contenting crude oil （40-70 mg·L ^-1）, the salt content is still above 10.0 mg·L^-1 after crude oil has been treated by two-stage electric desalting process in refinery, which cannot meet the need of refinery. Ultrasonic-electric united process is a novel technology for treating the high salt-contenting oil. On the optimal operating conditions of the ultrasonic-electric united process, the salt content of crude oil can be reduced from 67 5 mg·L^-1 to 3.97 mg·L ^-1 by one-stage ultrasonic-electric united process, and the water content falls below 0.3% （by volume）. The results show that the ultrasonic-electric united process is more effective than the electric process in high salt-contenting oil desalting. This technology should be useful in the refinery process.

关键词： crude oil ultrasonic-electric united process desalting dewatering

Wigner-Ville distribution and its application in seismic attenuation estimation

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Applied Geophysics 2007年第4期4卷 245-254页

作者：李艳东郑晓东中国石油勘探开发研究院物探技术所北京100083

The attenuation of seismic signals is often characterized in the frequency domain using statistical measures of the power spectrum. However, the conventional Fourier transform-based power spectrum estimation methods suffer from time-frequency resolution problems. Wigner-Ville distribution, which is a member of Cohen class time-frequency distributions, possesses many appealing properties, such as time-frequency marginal distribution, time-frequency localization, etc. Therefore, Wigner-Ville distribution offers a new way for estimating the attenuation of seismic signals. This paper initially gives a brief introduction to Wigner-Ville distribution and the smoothed Wigner-Ville distribution that is effective in reducing the cross-term effect, and then presents a method for seismic attenuation estimation based on the instantaneous energy spectrum of the Wigner-Ville distribution. A real data example from central Tarim Basin in western China is presented to illustrate the effectiveness of the proposed method. The results show that the Wigner-Ville distribution-based seismic attenuation estimation method can effectively detect the difference between reef, shoal and lagoon facies by their attenuation properties, indicating that the estimated seismic attenuation can be used for reef and shoal carbonate reservoir characterization.

关键词： Wigner-Ville distribution time-frequency analysis seismic attenuation reservoir characterization