摘要
根据低渗油藏的渗流特点,以及渗透率随压力变化的敏感性特征,建立了圆形封闭油藏渗流试井解释模型。对模型进行无因次化,并用数值法求解,绘制了无因次压力图版曲线。通过参数敏感性分析,发现启动压力梯度和压力敏感系数都使曲线后期出现上翘特征,并且随着参数值的增大,曲线的上翘程度也随之增大。
In the production of low permeability reservoir,as the formation pressure dropping,skeleton of reservoir are caused deformation,leaving the porosity and permeability reduction.This phenomenon is called pressure-sensitive effects,having this characteristic of the reservoir known as the deformable medium reservoir.Generally in low permeability reservoirs and deep pressure-sensitive effects of high pressure oil reservoir are more obvious.Based on the flow characteristics of low permeability reservoir,and sensitivity of characteristics of the permeability change with pressure,established a percolation model of closed circle for well test interpretation.The model is dimensionless and use numerical method for solution,and the curve of dimensionless pressure are drawn.Parameter sensitivity are analysed,it shown that pressure gradient and pressure sensitive coefficient make the curve of the late appearing upturned features,and with the increase of their parameters,the degree bend of curve also increased.
出处
《油气井测试》
2013年第2期1-3,75,共3页
Well Testing
基金
国家油气重大专项(2008ZX05013)资助
关键词
低渗油藏
压力敏感系数
启动压力梯度
数学模型
数值模型
low permeability reservoir,pressure-sensitive effects,pressure gradient,mathematical model,numerical model
