【作者】 刘峰；

【导师】 朱庆杰；

【作者基本信息】 河北理工大学 ， 防灾减灾工程与防护工程， 2010， 硕士

【摘要】 多孔介质的流体流动问题广泛存在于许多工程问题中,如地面沉降、水库诱发地震、堤坝稳定性、煤层瓦斯渗流等,同样也广泛存在于石油工业中,如注采过程中的油藏渗流、井壁稳定、油井和套管的损坏、产层出砂、水力压裂、地层失稳等。在回顾多孔介质热流固耦合理论的基础上,分析了双向相互作用耦合计算方法、热流固耦合的两种有限元模型以及作用模式等内容,探讨了应用有限元分析软件ADINA进行多孔介质热流固耦合分析的建模过程与方法。以石油生产中的热力采油为例,应用有限元分析软件ADINA对多孔介质热流固耦合问题进行数值模拟。分析了在热力采油过程中由于注蒸汽以及流体流动等因素对储油层的影响。在利用ADINA进行三维有限元建模时,有结构模型和流体模型两种,在建立结构模型时,土体采用Parasolid的方法建立,中间地层采用多孔介质材料,其余两层采用各项同性线弹性材料,分别赋予砂岩、泥岩等几种岩石材料,荷载分别考虑重力荷载和外力荷载。在建立流体模型时,土体和流体同样也采用Parasolid的方法建立,与结构模型不同的是在中间地层四周和井口处有流体,荷载分别考虑流体压力荷载和温度荷载。通过对多孔介质的材料、流体压力、温度以及外力荷载等参数影响情况分析之后得出结论:外力荷载对多孔介质地层的影响是最大的,所以在进行石油开采选址时应尽量避开地质不稳定的区域;温度和多孔介质的渗透系数对流体的流量影响较大,可以通过调整温度和选择合适的开采区域来达到提高产量的目的,一味的提高流体压力的方法是不可取的。更多还原

【Abstract】 Porous media fluid flow problems exist in many engineering problems, such as ground subsidence, reservoir-induced earthquakes, dam stability, coal seam gas seepage, etc. They are also widely distributed in the oil industry, such as the injection and production in the process of reservoir flow, wall stability, oil wells and casing damage, producing layers of sand, hydraulic fracturing, formation instability, etc.Two-way interaction coupling calculation method, the two kinds of finite element models of thermal fluid-structural interaction and other content are analysised on the basis of recalling the theory of porous media on thermal fluid-structural interaction. The modeling process and methods of porous media on thermal fluid-structural interaction are discussed using finite element analysis software ADINA. The article uses finite element analysis software ADINA for porous media on thermal fluid-structural interaction to numerical simulation, and analyses the impact of the reservoir due to steam injection and fluid flow in the process of thermal oil. There exists structural model and fluid model, when we establish three-dimensional finite element model using ADINA. Soil is established by parasolid in structural model, intermediate formation uses porous, the remaining two use Isotropic linear elastic material that are sandstone, shale and other rock materials. The load should consider gravity load and external load. Soil and fluid models were also established by parasolid in fluid model. The difference between structural model and fluid model is fluid around the middle stratum and the well-head. The load should consider fluid pressure load and temperature load.Through analysis of porous material, fluid pressure, temperature and external load, it is concluded that, firstly, the influence of external load on the formation of porous media is the largest, therefore, the choosing of the oil exploration site should try to avoid areas of geological instability; secondly, temperature and permeability of porous has more influence on the flow of fluid, so we can achieve the purpose of increasing production through adjusting the temperature and selecting the appropriate exploitation of the region.更多还原