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Search Results: 1 - 10 of 50914 matches for " Jianguang WEI "
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Evaluation of the Gel Profile Control Agent Polyacrylamide in Enhanced Oil Recovery
WEI Jianguang
Advances in Petroleum Exploration and Development , 2013, DOI: 10.3968/j.aped.1925543820130501.1102
Abstract: Based on the system of anionic delayed cross-link polymer gel type deep profile control agent, experiments are conducted to evaluate the performance of long-term thermal stability, shearing resistance, and compatibility with natural debris of profile control agent and compatibility with ASP compound system. Besides, experiments are completed to simulate core displacement profile controlling and evaluate effect of oil displacement. Formula of anionic delayed cross-link polymer gel profile control agent with ideal long-term stability is confirmed. Profile control effect referred to core with diverse permeability and influence law of different injection time and injection rate on effect of oil displacement. Following conclusions are made according to the research. Long-term thermal stability, shearing resistance, and compatibility with natural debris of profile control agent and compatibility of ASP compound system of anionic delayed cross-link polymer gel profile control agent all have good performance, as well as core plugging effect and resistance to erosion. Displacing effect varies with the profile control agent injecting time, which shows, injection before polymer displacing proves the best, injection during polymer displacing the second, and injection after polymer displacing the worst. At the same time, the value of enhanced oil recovery increases with the injection rate of profile control agent increasing, however, when the rate comes to the point of 0.1 pv, the increasing extent begins to slow down. Key Words: Profile control agent; Anionic; Delayed cross-link
Associations between Interleukin-1 Gene Polymorphisms and Coronary Heart Disease Risk: A Meta-Analysis
Liang Zhou, Jianguang Cai, Gang Liu, Yuan Wei, Hui Tang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0045641
Abstract: Objective A great number of studies regarding the associations between IL-1B-511, IL-1B+3954 and IL-1RN VNTR polymorphisms within the IL-1gene cluster and coronary heart disease (CHD) have been published. However, results have been inconsistent. In this study, a meta-analysis was performed to investigate the associations. Methods Published literature from PubMed and Embase databases were searched for eligible publications. Pooled odds ratios (ORs) with 95% confidence intervals (CIs) were calculated using random- or fixed- effect model. Results Thirteen studies (3,219 cases/2,445 controls) for IL-1B-511 polymorphism, nine studies (1,828 cases/1,818 controls) for IL-1B+3954 polymorphism and twelve studies (2,987 cases/ 2,208 controls) for IL-1RN VNTR polymorphism were included in this meta analysis. The results indicated that both IL-1B-511 and IL-1B+3954 polymorphisms were not associated with CHD risk (IL-1B-511 T vs. C: OR = 0.98, 95%CI 0.87–1.09; IL-1B+3954 T vs. C: OR = 1.06, 95%CI 0.95–1.19). Similarly, there was no association between IL-1RN VNTR polymorphism and CHD risk (*2 vs. L: OR = 1.00, 95%CI 0.85–1.17). Conclusions This meta-analysis suggested that there were no associations between IL-1 gene cluster polymorphisms and CHD.
A Study on Alkali Consumption Regularity in Minerals of Reservoirs During Alkali(NaoH)/Surfactant/Polymer Flooding in Daqing Oilfield
Zhenhai JIANG,Qingjie ZHANG,Jianguang WEI,Yunsong GAO
Advances in Petroleum Exploration and Development , 2012, DOI: 10.3968/2404
Abstract: In the process of oil displacement of ASP (Alkali/ Surfactant/Polymer) flooding , when Alkali interacts with the fluid and minerals of the reservoir, the alkali is subject to be consumed. The consumption regularity is the key factor affecting ASP ingredient, injection plan, scaling regularity for production wells and oil displacement effectiveness. Therefore to study the alkali consumption is of great significance in guiding ASP ingredient, injection project design, and the analysis for oil displacement mechanism. In this paper, aiming at the main components of minerals in the reservoir in Daqing Oilfield, the laboratory study on static alkali consumption for five kinds of minerals (kaolinite, grundite, chlorite, feldspar and quartz) in ASP system and single component NaOH solution are done respectively. The alkali consumption regularities for five kinds of minerals in ASP and single component NaOH solution are concluded. The research indicates that the amount of alkali consumption for kaolinite, grundite, chlorite, feldspar and quartz is changing from larger to less accordingly, but is mainly caused by clay minerals; the average alkali consumption is 18.3% higher than that by matrix minerals. In single component NaOH solution, the alkali consumption styles of clay minerals and the matrix minerals take the chemical reaction as the lead, and the physical adsorption as the second. In ASP system solution, the alkali consumption style of clay minerals, takes the physical adsorption as the lead, and of matrix minerals takes the chemical reaction as the lead. In ASP solution, compared with single component solution, polymer and surfactant have the functions of restraint to alkali consumption in minerals of the reservoir, and the amount of alkali consumption decreases evidently. Key words: Alkali; Surfactan; Polymer; ASPl; Oil displacement
Study on Matching Ability Between Cement Particle Size and Permeability in the Process of Oil Reservoir Plugging
Qingjie ZHANG,Jianguang WEI,Guojun SUN,Liyang JIN
Advances in Petroleum Exploration and Development , 2012, DOI: 10.3968/j.aped.1925543820120301.161
Abstract: In order to satisfy the plugging demands of injecting the cement plugging agent into reservoirs with different radial depths, the technical studies of cement particle size optimization should be conducted. Through indoor experiment, the relationship between cement particle size and permeability was investigated by both macroscopic and microcosmic analysis. It is observed that the reservoirs which permeabilities are within 50~200mD are matching well with the cement agents which particle sizes are less than 5μm. And the permeabilities within 200~400mD are matching well with the cement agents which particle sizes are within 5~10μm, the permeabilities within 400~700mD are matching well with the cement agents which particle sizes are within 10~20μm, the permeabilities are above 700mD are matching well with the cement agents which particle sizes are more than 20μm. The plugging success rates of all the matching experiments are exceeding 90%. This research result is important to direct the plugging operation in the field. Key words: Plugging off and channeling prevention; Cement particle size; Permeability; Matching relationship; Experimental study
The Performance of Polymer Solution Added with Viscosity Stabilizer and the Evaluation of Its Oil Displacement Efficiency in Daqing Oilfield
Jianguang WEI,Qingjie ZHANG,Zhenhai JIANG,Haijun ZHANG
Advances in Petroleum Exploration and Development , 2012, DOI: 10.3968/2401
Abstract: Aiming at the low viscosity of polymer solution, which is compounded with fresh water but diluted with produced water, and at the problems concerning oil displacement efficiency, an onsite test on polymer solution with viscosity stabilizer (PSVS) is carried out. As a result, it has great and guiding significance to the application and popularization of viscosity stabilizer by studying the performance of polymer solution with viscosity stabilizer and its influence on oil displacement efficiency. In this paper, aiming at two different kinds of polymer solutions among which one is compounded with fresh water but diluted with fresh produced water and the other with aerated produced water, two laboratory evaluative tests concerning viscosity stabilization, anti-shear stability, fluidity, and absorbability of polymer solution as well as its oil displacement efficiency are done. The results of onsite application of PSVS are traced and analyzed. The viscosity stabilization of the polymer solution adding with viscosity stabilizer becomes much better than that of the normal polymer solution. The resistance and the residual resistance factors, the static oil sand adsorption rate and the dynamic core adsorption rate of the solution are all increased markedly. The working viscosity and oil displacement efficiency are improved markedly as well. In comparison with the polymer solution diluted with fresh produced water, the polymer solution diluted with aerated produced water is much better in terms of viscosity stabilization. Comparing with the normal polymer solution with viscosity stabilizer before sheared, the polymer solution which is sheared before adding with viscosity stabilizer performs obviously better in terms of viscosity stability. In contrast to the adjacent block injected with normal polymer solution, the block under onsite flooding test with injection of PSVS features that the average injection pressure increases slightly but keeps steady, the recovery speed of the average monthly water cut of production wells slows down, the thickness of the absorptive layers increases, and the periodic recovery rate improves as well. Key words: Polymer solution; Viscosity stabilizer; Daqing oilfield
A Semi-Implicit Scheme of Lattice Boltzmann Method for Two Dimensional Cavity Flow Simulation  [PDF]
Lei Zhang, Jun Yao, Hai Sun, Jianguang Zhang
Open Journal of Fluid Dynamics (OJFD) , 2015, DOI: 10.4236/ojfd.2015.51002
Abstract: The calculation sequence of collision, propagation and macroscopic variables is not very clear in lattice Boltzmann method (LBM) code implementation. According to the definition, three steps should be computed on all nodes respectively, which mean three loops are needed. While the “pull” scheme makes the only one loop possible for coding, this is called semi-implicit scheme in this study. The accuracy and efficiency of semi-implicit scheme are discussed in detail through the simulation of lid-driven cavity flow. Non-equilibrium extrapolation scheme is adopted on the boundary of simulation area. The results are compared with two classic articles, which show that semi-implicit scheme has good agreement with the classic scheme. When Re is less than 3000, the iterations steps of semi-scheme can be decreased by about 30% though comparing the semi-implicit scheme with standard scheme containing three loops. As the Re increases into more than 3400, the standard scheme is not converged. On the contrary, the iterations of semi-implicit scheme are approximately linear to Re.
The Price Forecasting of Military Aircraft Based on SVR  [PDF]
Jifeng Tong, Jiaxing Du, Ping Chen, Jianguang Yuan, Zhan Huan
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.35030

The difficulty of the prediction of military aircraft purchase price lies in the small sample data, and the sample data have the complicated non-linear characteristics. By analyzing the influence of parameters of aircraft purchase price, SVR is proposed to predict the aircraft purchasing price model, and uses the model to predict the aircraft purchase price. The calculation results show that the prediction of the purchase price to establish military aircraft model has higher prediction accuracy.

Psychological Endurance Hypothesis for Uncertain Decision and Its Application in Supply Chain Information Sharing  [PDF]
Xirong Gao, Ying Shi, Jianguang Zhang, Yang Luo
Journal of Financial Risk Management (JFRM) , 2017, DOI: 10.4236/jfrm.2017.62016
Abstract: This paper aims to present a new hypothesis to understand better decisions with uncertainties, and to explore as well its application in improving supply chain information sharing. From the observation that real investment decision behaviors generally imply that investors’ mental states tend to experience subtle changes with increasing the amount of investments, the psychological endurance hypothesis and the corresponding utility function are constructed. The hypothesis embraces the income-cost ratio into the set of constraints of the value of an investment, which emphasizes the decisive role of investment return rate or profit rate, and then innovatively introduces the concept of critical point of psychological endurance from which it is found that the investment behaviors demonstrate completely different characteristics on the left and right side of this critical point, and that investors’ investing willingness could be raised through exercising their psychological endurance to move outward the locations of their critical points of psychological endurance. Making further use of the hypothesis produces the shorter-board optimization model of supply chain information sharing with decision variable of the value index of information sharing. This model reveals that enterprise’s value index of information sharing has a positive relationship with the success rate of information sharing, but a negative one with the information-sharing cost elasticity of psychological vulnerability, the social risk level, and the cost of information sharing. And the model also suggests that the overall information sharing of a supply chain could be eventually achieved by ever increasing the shorter-board enterprise’s value index of information-sharing.
Magnetism and Stability of Diluted Magnetic Semiconductor (Ga1-xFe x )As

Wei Shuyi,Yan Yuli,Wang Tianxing,Xia Congxin,Wang Jianguang,

半导体学报 , 2004,
Abstract: Magnetism and the stability of (Ga 1-xFe x)As are investigated using the first principles LMTO-ASA band calculation by assuming supercell structures.Four concentrations of the 3d impurities are studied (x=1,1/2,1/4,and 1/8).The results show the effect of varying Fe concentration on the magnetic and stable properties.
The Transformation and Expression of HBsAg Gene in Arachis hypogaea

Jianguang Zhu,Yahui Wei,Zhiguang Guo,Yizhou Wu,Haoyong Hao,Jie Sun,

植物学报 , 2006,
Abstract: 构建了乙肝表面抗原主蛋白基因(SHBs)的植物表达载体, 通过农杆菌介导转化花生(Arachis hypogaea)并利用潮霉素筛选出抗性苗, 经PCR和Southern杂交鉴定转基因植株; 取植株的蛋白粗提液进行ELISA检测, 结果表明, SHBs能在花生中表达, 且具有免疫原性, 其在新鲜叶片中的表达量约为2.41 mg.g-1鲜重, 占总可溶性蛋白的0.033%。
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