夹层影响下等效渗透率的表征

Characteristics of equivalent permeability affected by interlayer

夹层是影响流体流动的主要因素,虽然地质模型能够很好刻画夹层分布,但在导入油藏数值模拟软件时,受模拟效率以及网格规模限制,夹层往往被粗化掉,导致数值模拟与实际开发存在差异。为了等效表征夹层影响下的渗流特点,引入Begg和King等人提出的流线法用来计算夹层影响下的渗透率等效值,并与实际油藏数值模拟器中流线法模拟结果进行了比较。考虑了夹层的个数变化、夹层的长度变化及夹层的分布方式变化等不同情况,分别利用流线法计算理论渗透率;同时在黑油模拟器中搭建了一样的网格模型,得到了不同情况下的压力值,将压力值与理论渗透率的值进行了拟合,拟合效果较好。该研究为精细地质模型准确粗化提供了手段,能够服务于油田开发。

Interlayer is the main factor that influences the fluid flow,although the geological model can depict the distribution of interlayer,the interlayer are often upscaled and the results of simulation are often limited by simulation efficiency and grid scale. In order to represent the flow characteristics under the influence of interlayer,bringing in the streamline method and comparing the results from streamline method from actual reservoir numerical simulator. Taking into account the number,length and distribution of interlayer,and calculate the permeability using streamline method and build the same grid model in black oil simulator output result of the value of pressure,and match the pressure values with theoretical permeability with a good result. The study can provide means to accurately upscale the fine geological model and can serve to the development of oilfield.