长期水驱后强非均质性油藏动态相渗曲线计算方法研究

A study on the calculation of dynamic relative permeability curve in strong heterogeneity reservoir after long time water driving

国内大部分油田相渗资料多为油藏初始状态时岩心测量获得,随着油田不断开发,长期冲刷的岩石孔吼结构发生变化,油水相对运动关系也必然出现不同程度改变,但油田开发中后期重新取样测试相渗的甚少。本文基于强非均质性油藏某生产井中后期实际生产动态数据,根据相对渗透率函数表达式进行推导,而后利用二元拟合最终计算得到长期水驱后的动态相渗曲线。将本文所提方法应用于某一海相底水驱砂岩油藏生产井,得出结果符合油田实际,并指出该方法适用性和局限性。本文提出的方法应用于实际油田不仅节约油田开发成本,还能有效反映储层动态变化规律,为油田的开发设计、开发调整及开发分析提供重要依据。

The relative permeability curves data is measured at the original stage by experi- mental method in most of domestic oilfield.However,with the development of oilfield, the for- mation rock is scoured in a long time leading to the change of pore structure and relative flow capability between oil and water.But the re-measurement for relative permeability curves by re-coring in oilfield is rare.Based on the practical dynamic data of oil well after high water cut stage in strong heterogeneity reservoir, the dynamic relative permeability curve after long time water driving could, ultimately,be obtained by means o f binary fitting after the derivation for relative permeability function expression in this paper.It turns out to be reasonable after applying to the oil well in one bottom water- driving sandstone reservoir and the applicability and limitations of this method are pointed out ultimately. If applying the new method proposed to oilfield, it can not only reduce the development cost of oilfield, but also reflex the oil field dynamic variance law which is of great significance to development design and adjustment as well as development analysis.