摘要：
Mining activity causes a large quantity of solid waste on the surface of mining area. The pollution of groundwater, which is caused by coal gangue in the process of rainfall leaching, becomes more and more serious. The present study analyzed the main chemical components of coal gangue through laboratory experiment, and the microelement mathematical model was established based on the theory of porous medium fluid mechanics and solute transport kinetics, this model described the movement pattern of the microelements in the groundwater environment system. Taking element Pb as an example, its concentration distribution in groundwater is predicted for the next 20 years by numerical simulation with Finite Element Method., The results showed that, As the time passed, the microelements pollution range expanded. The microelements is strongly blocked by interception effect though the cohesive soil. This result have both theoretical and practical significance and for effectively resolving environmental problems caused by the coal gangue solid waste in the mining area.
摘要：
Casing damage during water injection pressure relief is difficult to resolve in oil field. The fluid pressure of inner casing wall undergoes a sudden decrease because of injecting water release. At the same time, the effective stress of soil around the well-bore increases quickly, and the extrusion pressure of casing bearing also increases. In order to study the mechanism of the problem, a fluid-solid coupled model was set up. According to comparison of the fundamental equation and boundary conditions, the ANSYS function of temperature field analysis is similar to that of seepage flow field. The coupled analysis of strata-casing-cement system was done. The simulation results show that during the pressure relief process, the geo-stress around well-bore changes, at the beginning time the extrusion pressure increase suddenly, and then with the time going on, the pressure will be the same to the pore pressure of reservoirs. The bigger the pressure difference between inner wall and ektexine, the bigger extrusion pressure of casing bearing during the pressure relief.
作者机构：
[何翔; 段翔; 黄小兰; 刘建军] Institute of Porous Media Mechanics, Wuhan Polytechnic University, Wuhan 430023, China;[陈剑文; 杨春和; 黄小兰] Wuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
通讯机构：
Institute of Porous Media Mechanics, Wuhan Polytechnic University, China
会议名称：
The 3rd International Symposium on Modern Mining & Safety Technology Proceedings(第三届现代采矿与安全技术国际学术会议)
会议时间：
2008-08-04
会议地点：
辽宁阜新
会议论文集名称：
The 3rd International Symposium on Modern Mining & Safety Technology Proceedings(第三届现代采矿与安全技术国际学术会议)论文集
关键词：
casing damage;stress;composite element model;numerical simulation
摘要：
Research on stress of oil-water well casing was the basic work for studying the mechanism of casing damage. Based on the geo-stress, the elastic-plastic model of composite element of casing-cement sheath-surrounding rock was built, and the elastic-plastic model of the casing composite element was numerical calculated. By uniaxial compression and shear numerical experimentation of the casing composite element, the value of elastic-plastic parameter of equivalent element was defined, and then calculated the equivalent element and defined the parameter value of shearing strength. The results showed that composite and equivalent elements have plastic deformation when maximum principal stress increased to 60 MPa, the stress distribution and plastic deformation of the equivalent element were basically correspondence with the composite one. It was significant for preventing casing damages, guaranteeing oil field safety in production through adjusting injection-production techniques.
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.
摘要：
In order to analyze mechanism of casing damage, the uniaxial compression experiment and creep experiment of interbedded mudstone samples from Sanan development area of Daqing Oilfield under different water contents were carried out. The changes of the mudstone’s mechanical parameters and creep characteristics with the increment of water saturation were studied. The results indicate that the rock strength and elastic modulus decrease rapidly with the increment of water content, at the same time, the creep strain and creep strain rate of steady state increase with the increment of water content, and also the steady state creep strain rate is enhanced with the increment of deviatoric stress. Through the creep characteristic curves, a non-linear creep constitutive equation of mudstone considering the change of water contents is established, which will be used in future numerical analysis.
作者机构：
[刁顺] Department of Science and Technology, CNPC, Beijing 100081, China;[刘建军] Institute of Poromechanics, Wuhan Polytechnic University, Wuhan 430023, China;[刘建军; 杨春和; 黄小兰] Institute of Rock and Soil Mechanics, Chinese Acad. of Sci., Wuhan 430071, China
通讯机构：
Department of Science and Technology, CNPC, China
作者机构：
[刘建军; 黄小兰; 熊俊; 周辉; 杨春和; 冒海军] Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;[刘建军] Institute of Porous Media Mechanics, Wuhan Polytechnic University, Wuhan 430023, China
通讯机构：
Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, China
