电热油藏采油物理模拟的相似准则及其应用

电热油藏采油是一项开采稠油的新技术。根据电热油藏采油的机理，建立了电热油藏采油过程中电流场、渗流场、温度场的数学模型；采用方程分析法和量纲分析法推导出了电热油藏采油物理模拟的相似准则数群；结合电热油藏采油的工程判断，给出了一套适用于电热油藏采油物理模拟研究的主要相似准则。应用这一套相似准则，建立了电热油藏采油的低压三维物理模型实验系统，通过物理模拟实验研究了加热电功率和油层电导率对原油采收率的影响。结果表明：原油采收率随加热电功率的增加而提高，但电功率并不是越大越好，电功率增加到50kW以上时，采收率提高幅度很小；油层电导率低，输入电能有效利用率高，采收率高。

Theory and Application of the Scaling Laws for Physical Modeling on Oil Recovery from Reservoirs with Electrical Resistance Heating

Electrical resistance heating(ERH) is a new thermal stimulation technique for recovering heavy oil reservoirs.The mathematical model for analyzing ERH patterns was developed on the basis of the mechanism of oil recovery from reservoirs with electrical resistance heating.The scaling groups for physical modeling studies on oil recovery with ERH technique are derived with equational analysis and dimensional analysis on this mathematical model,and a set of main scaling parameters was inferred based on the engineering judgment.A 3dimensinal physical model in low-pressure situation was built with the set of main scaling parameters.The effects of the electric power heating reservoirs and the electric conductivity of oil rock on the oil recovery with ERH technique were studied by using the physical modeling experiments.The experimental results show: the higher the heating electric power is,the higher the value of oil recovery factor is.Whereas the electric power has little effects on the oil recovery,it is above 50 kW.When the electric conductivity of reservoir is low,the power supplied to the reservoir is utilized efficiently,and the value of oil recovery factor from the reservoirs with electrical heating is also high.