确定油藏油水渗流特征的新方法

在马克西莫夫-童宪章水驱特征曲线的基础上,将微分和物质平衡方程、Welge方程相结合,可得到马克西莫夫-童宪章水驱特征曲线对应的微观油水渗流特征方程,为利用油藏生产数据确定油水渗流特征提供新的方法。利用物性好的大庆油田南二三开发区葡Ⅰ组油藏生产数据,给出详细计算流程,其计算结果与水驱油实验结果基本一致,表明新方法可行。利用三塘湖油田牛圈湖特低渗油藏马62井区油水渗流特征进行验证,发现马62井区体积压裂后所表现出的油水渗流特征与相邻井区室内实验确定的结果相差较大,表明室内实验得到的油水渗流特征只反映了基岩的油水渗流特征,未能反映多孔介质油藏注水开发过程中的水驱油特征。

A New Method to Determine Oil-Water Seepage Characteristics in Oil Reservoirs

The microscopic oil-water seepage characteristic equation corresponding to the Maksimov-Tong water drive characteristic curve can be obtained by combining differential and material balance equation with Welge equation on the basis of the Maksimov-Tong water drive characteristic curve. It is a new method for determining oil-water seepage characteristics by using production data. Taking the PuⅠ oil reservoirs with good physical properties in Block Nan-2 and Nan-3 of Daqing oilfield as a case, we established the detailed calculation process based on production data, and found the calculated results were almost consistent with water flooding experimental results, indicating that the new method is feasible. Furthermore, the method was applied in the Niujuanhu oil reservoir with extra-low permeability in Wellblock Ma-62 of Santanghu oilfield. But the oil-water seepage characteristics in Wellblock Ma-62 after volume fracturing were very different from the laboratory experimental results obtained from its adjacent wellblocks, indicating that the oil-water seepage characteristics determined in laboratory experiments can only reflect the oil-water seepage characteristics of the basement instead of the porous reservoir during water flooding development.