期刊：
Proceedings of the International Conference on Information ManagementProceedings of the International Conference on Information Management, Innovation Management and Industrial Engineering, ICIII 2008,2008年3:407-411
通讯作者：
Zhao Wanhua
作者机构：
[Zhao Wanhua] Wuhan Univ, Econ & Management Sch, Wuhan 430072, Peoples R China.;[Zhao Wanhua; Liu Ruiyu] Wuhan polytech Univ, Dept Civil Engn, Wuhan 430023, Peoples R China.
会议名称：
2008 International Conference of Management Science and Engineering(2008管理科学与工程国际学术会议)
会议时间：
2008-11-01
会议地点：
河南焦作
会议论文集名称：
2008 International Conference of Management Science and Engineering(2008管理科学与工程国际学术会议)论文集
关键词：
net present value;oilfield;economic index;well space density;economic benefit
摘要：
With the continuously deepen of internationalization degree of oil field exploitation project, economic evaluation plays a vital role during the oil field development. In the process of oil field evaluation, net present value (NPV) is an important index, which reflects the economic benefit as a whole. The paper represented the technical and economical characteristic of Oilfield development project and gave out the main economic index calculation method. By analyzing the oilfield investment project, it is suggested that the total net present value should be used to evaluate the economic benefit in oilfield investment project. From the example study, it is found that the results got by the total NPV method is much similar to the results which calculated by intersecting method. The total NPV method is simple compared with other method, and is easily to learn and use in oilfield investment project evaluation.
会议名称：
International Conference on Intelligent Computation Technology and Automation(2008 智能计算技术与自动化国际会议 ICICTA 2008)
会议时间：
2008-10-20
会议地点：
长沙
会议论文集名称：
International Conference on Intelligent Computation Technology and Automation(2008 智能计算技术与自动化国际会议 ICICTA 2008)论文集
摘要：
The artery control system is an important part of urban traffic control. Based on the analysis of the actuality of traffic, the optimization scheme of its artery control system on Jianshe Boulevard in Wuhan is put forward in this paper. First optimizing the signal timing of each single-point intersection, then we design the two-way green wave system. In the end the software Vissim is adopted to evaluate the scheme.
关键词：
Construction industry;Knowledge management;Innovation;Development
摘要：
Knowledge management is the recognition of the knowledge value in a totally new sense. It is a new management model based on the functional division of knowledge. Knowledge management is a new management model that appears in recent years, This paper analyzes the current situation of our country's construction industry, then this paper analyzes the origin, development, character and enforcement of the knowledge management, so it is very necessary to use knowledge management, then this paper puts forward the measures of using knowledge management to promote construction industry innovation and development, knowledge management will improve the innovation ability and core competition ability of construction industry. So knowledge management can make a greater contribution to the Chinese economic and social development.
摘要：
Hydraulic fracture technique, as a main measure, has been widely used for stimulation of oil and gas reservoirs by creating a propped conductive channel. However, the mechanism and propagation process of hydraulic fracture have not clearly known to us. According to fluid mechanics in porous media, rock mechanics, heat transferring theory and fracture mechanics, the authors removed many hypotheses in common 2 - dimensional model and deduced a three-dimensional model of hydraulic fracture. The injected fluid is assumed to be an incompressible power-law type non-Newtonian fluid and to be 2 - dimensional laminar flow in the fracture. The governing equation of the fracture flow is derived from its continuity, momentum and constitutive equations. The fracture criterion is based on a stress intensity factor approach. The finite element formulas are gained by employing the standard Galerkin approximation. Through numerical simulation, parametric sensitivity investigations are performed to illustrate the role of different variables on hydraulic fracture configuration evolution in oil formations.
期刊：
PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON RISK MANAGEMENT & ENGINEERING MANAGEMENT, VOLS 1 AND 2,2008年:514-516
作者机构：
[Liu Hanjun; He Xiaing] Wuhan Polytech Univ, Inst Poromech, Wuhan, Peoples R China.
关键词：
well space density;economic limit;oil field;development
摘要：
During oil development scheme design and well pattern infilling, which type well pattern should be selected, and how much the well space density is, and how to make the economic best arc the main problems which oil reservoir concerned. From the relationship between well pattern density and recovery ratio, combined with the economical evaluation and inject and production balance method, a new method to decide the reasonable well pattern density was given. It is significant for the well space density economic limit determination and reasonable investment.
会议名称：
International Conference on Intelligent Computation Technology and Automation(2008 智能计算技术与自动化国际会议 ICICTA 2008)
会议时间：
2008-10-20
会议地点：
长沙
会议论文集名称：
International Conference on Intelligent Computation Technology and Automation(2008 智能计算技术与自动化国际会议 ICICTA 2008)论文集
摘要：
The accounting matrix approach has been widely used in national accounting and development economics (social accounting matrix, SAM), it still never application of transportation. This paper introduced the characteristics of the communication and transportation industry, established the fundamental Traffic Accounting Matrix (TAM), extended traffic accounting matrix and model The development of traffic and traffic forecast were reflected by TAM. An example of the extended traffic accounting matrix (ETAM) is presented. The analysis results show that an ETAM can be a useful tool for traffic system analysis.
摘要：
The new approach for vendor selection problem was established under the stochastic environment. After establishing the traditional multi-objective programming model, through minimizing the optimistic value of the net cost of the total order quantity, rejected quantity and late delivered quantity, the multi-objective stochastic constrained integer programming model was established based on the stochastic chance constrained programming theory, then a hybrid intelligent algorithm was designed by integrating the stochastic simulation, neural networks and genetic algorithm. The numerical example confirms the model is rational and the algorithm is valid. The stochastic constrained programming approach is feasible. It can solve the vendor selection problem.
期刊：
PROCEEDINGS OF FIRST INTERNATIONAL CONFERENCE OF MODELLING AND SIMULATION, VOL VI: MODELLING AND SIMULATION IN ARCHITECTURE, CIVIL ENGINEERING AND MATERIALS,2008年:258-261
关键词：
well structure;stress of bent casing;thermal recovery;casing damage;numerical simulation
摘要：
Steam injection process has been widely applied to enhance oil rate in thermal heavy oil production. But the different well structures have large influence on casing stress distribution, especially on bent part, which can reduce casing service life. During steam injection, the casings with different well structure sustain different thermal stress, especially to bent casing, which can cause casing damage and severely affect oil production and economic benefit. The influence of well structure on stress distribution of bent casing in thermal production horizontal well was studied through numerical simulation. The results can provide theoretical guidance to analyze casing stress status and prevent casing damage.
摘要：
The construction of prestressed high-strength concrete pipe pile can be performed by static pressure and hammer striking. As a rapidly-developing way of construction pile foundation, liquid static pressure has the advantages of less noise pollution, no environmental pollution and thus meets the needs of environmental protection in modem cities. On the other hand, large liquid static pressure machinery demands greater bearing capacity and smoothness of the worksite due to its heavy weight. This paper mainly deals with how to reduce squeezing effect on the piling and its quality and the moving of large liquid static machinery on soft ground and therefore provides some references for the operation in similar cases.
摘要：
Each bank has taken many measures to retain existing customers, but as for the current financial market, the bank customer dropout of our commercial banks is a common phenomenon, the root of which rests on that many banks haven't correctly distinguish the main reasons and secondary reasons for the dropout of customers when establishing the measures, so those measures are lack of focus. This article analyzes the correlation degree for the bank customer dropout to each related factors and get the ordering of correlation degree for each factors to the customer dropout based on Fuzzy Clustering and Grey Theory so that our banks can find out the main factors of customer dropout right, take focused measures and eventually enhance the effectiveness of measures to avoid the customer dropout.
摘要：
The coupling model of water's flowing in pipes and migration in soil body was built on the theory of fluid mechanics in porous media and hydrodynamic theory. Navier-Stokes equation was used to control the flowing of water in percolation irrigation pipes, and Darcy's law was used to simulate the migration of water in soil body. COMSOL Multiphysics which is multi-physical analyzing software was adopted, and the set-up numerical model was simulated and analyzed. The results showed that it was suitable when pressure head was 2m and the distance between plastic pipe and crop roots was 30mm.
期刊：
NEW TRENDS IN FLUID MECHANICS RESEARCH: PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON FLUID MECHANICS,2007年:601-601
通讯作者：
Pei, G. H.
作者机构：
[Liu, X. G.] Chinese Acad Sci, Inst Porous Flow & Fluid Mech, Langfang 065007, Peoples R China.;[Pei, G. H.] Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Hubei, Peoples R China.
通讯机构：
[Pei, G. H.] W;Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Hubei, Peoples R China.
摘要：
Precise numerical simulation to seepage zone is a significant part of water power project. The accuracy of numerical analysis to seepage zone depends on both the simulation extent of the numerical model and parameter determination. At the present, the mathematical seepage model is, to a large degree, perfect, but the parameter determining; especially the permeability coefficient is far from perfect. Indoor experiments measuring permeability coefficient is easily influenced by the sample uncertainty and scale effect. Permeability coefficient got from field test is relatively accurate, but the precision of result depend on the number and distribution of test points. By increasing the number of test points, the precision is improved. Correspondingly, the cost rises. It is a new manner to inverse the rock permeability coefficient through numerical model. The basic idea is set a numerical model of seepage field, by fitting the dynamic information (such as head, flux) of the movement of ground water to inverse the permeability coefficient of rock mass. Parameter got through inversion can reflect the seepage characteristics of the rock mass of target zone. But inversion methods exist two difficulties: result indeterminacy and heavy load of calculation. Genetic algorithm developed from simulating life evolution system is a searching algorithm. Its applications in rock project and geophysics suggest that it can overcome indeterminacy of inverse problem. The biggest difficulty of genetic algorithm when used to parameter inversion is that its searching space is huge and the convergence speed is slow, which will result in too much calculation in the process of inversion. In order to overcome this defect, a mixed algorithm is established through the combination of genetic algorithm and optimistic method. As an improvement, this paper based on genetic algorithm is about permeability coefficient inversion, a global optimism of inversion result is assured. At the same time, in the process of inversion, some characteristics of seepage are considered, and a local searching process is added to establish a mixed algorithm to reduce searching space and increase convergence speed. The application of the algorithm in the permeability coefficient inversion of a gravity dam site indicates that the optimism of inversion result is efficiently assured and, hence, the uniqueness of solution, but also quicken convergence and reduce calculation burden.
摘要：
The resource constrained project scheduling problem (RCPSP) is extended to flexible resource constrained project scheduling problem (FRCPSP) in this paper. Resources are assumed to have certain capabilities demanded by project activities, but not necessarily all of them. Resource capability matrix (RCM) is proposed to represent flexible resources. A multi-agent system composed of resource agent, activity agent, and service agent is put forward as an information infrastructure to support flexible resource constrained project management in a highly distributed environment. The definitions of component agents and the strategies of flexible resource allocation are discussed.
摘要：
A spare optimization model for systems with components in series where the failure time of components follow any general distribution is presented. The availability of the system at any time is obtained through renewal process theory. The objective of the optimization problem is to maximize the availability of the system satisfying constraints on cost and volume. Genetic algorithms are used to find the optimal amount of spares for each component. Finally, an illustrative example is given.
摘要：
At the present time, the mechanics of seepage in fracture-cavity carbonate reservoir is not very clear. Fracture-cavity carbonate reservoir was simplified as regular fracture-cavity net model and rules of seepage in it were studied by numerical simulation based on Navier-Stokes equation (N-S equation). Results showed that flux exponentially Increased along with the Increase of fracture width but flux and diameter of cavity had linear relationship; the seepage in fracture-cavity also obeyed the Dairy's law, bnt the permeability was bigger than the fracture model's, which represented different performance of flow; fracture width had more impact to seepage than diameter of cavity.
期刊：
PROCEEDINGS OF THE 2007 INTERNATIONAL CONFERENCE ON AGRICULTURE ENGINEERING,2007年:142-145
作者机构：
[Chao, Meng; Liu Jianjun] Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Peoples R China.
会议名称：
2007 International Conference on Agriculture Engineering(2007年农业工程国际会议)
会议时间：
2007-10-20
会议地点：
河北保定
会议论文集名称：
2007 International Conference on Agriculture Engineering(2007年农业工程国际会议)论文集
关键词：
single well;perforated;seepage;numerical simulation;flow conductivity;water output
摘要：
Perforation in the wall of well is a new approach to raise the water output from the single well, and it can improve the flow Conductivity. The numerical model of seepage in the aquifer was built based on the theory of seepage mechanics, and numerical simulation by COMSOL Multiphyics was done to analyze seepage law in perforated well. It provides the theory for raising the water output from a single well.
摘要：
Based on the S-N relationship and statistical property of concrete static strength, a function of fatigue life of concrete, 1//(a-blogN), is found to follow the normal distribution. Thus a new probabilistic model of fatigue life distribution of concrete is presented in this paper. The model connects statistical properties of static strength and fatigue life of concrete together in theory, so it is of clear physical meaning, An experiment was conducted. The experiment was a part of the project of The State Natural Science Foundation-Failure Criterion of Plain Concrete Under Multiaxial Fatigue Loading, Χ<sup>2</sup>-test and Kolmogorov-Smirnov test are employed to test the proposed model. Fuzzy optimization is used to compare the model with lognormal distribution. Χ<sup>2</sup>-test, Kolmogorov-Smirnov test and fuzzy optimization are also conducted for test data from references. The results show that the new model is more flexible to fit test data.
期刊：
NEW TRENDS IN FLUID MECHANICS RESEARCH: PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON FLUID MECHANICS,2007年:592-592
通讯作者：
Liu, J. J.
作者机构：
[He, X.; Liu, J. J.; Pei, G. H.] Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Hubei, Peoples R China.;[Liu, X. G.] Chinese Acad Sci, Inst Porous Flow & Fluid Mech, Langfang 065007, Peoples R China.
通讯机构：
[Liu, J. J.] W;Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Hubei, Peoples R China.
摘要：
Casing damage has become a very serious concern in China since 1970s. Along with adoption of high-pressure water injection and high pressure hydraulic fracturing in oil fields, casing damage become a challenging technical difficulty in the Chinese and international petroleum industry. Many researchers have been devoted to solve the problems and had identified important factors affecting casing damage. such as geologic structure, development operation and drilling program. Although stress concentration around well bore is the direct reason of casing damage, it is the flow field change that induced geostress redistribution. Therefore, it is necessary to study the fluid-solid coupling during oil development to identify casing damage mechanisms. According to the casing damage characters, casing damages induced by seepage can be classified into three kinds: shear-sliding damage, tension damage, and squeeze damage. Shear damage is induced by geologic fault slippage because water or oil flow into fault, and intenerates the mechanical parameters. When porous pressure increases to critical value, fault will slippage, and cause casing collapse. Tensile damage is induced by vertical strata displacement. When large volume water is injected into reservoir. porous pressure rises, and leads to strata elevated. If the exceeds the casing’s tensile strength, casing pipe will be destabilized. Extrusion casing damage is induced by large pressure gradient around the well bore as a pressure releasing effect in the water injection wells. Based on fluid-solid coupling theory, the authors analyzed the mechanism of the 3 kinds casing damage and presented mathematical models. Using 3-D finite element method, the authors simulated the rock deformation patters causing casing damages in Daqing oil field, China, during water-flooding operations. According to the simulation results, some technical measures and critical injection pressure to prevent casing damage are given in the end for Daqing oil field.
摘要：
According to seepage Darcy's law and Burkley-Leverret equations, mathematical model to simulate saturated-unsaturated seepage was deduced. Based on immune evolution algorithm, the authors simulated typical side slope seepage in Longtan hydropower station. Simulation results show that fractures and grading angle are seepage pressure concentration regions, where seepage pressure gradient is larger than other region and is much more easily to destabilize.
