高含水油田微观水驱油机理实验研究

采用高含水油田储层岩样分析的孔隙结构特征,制作相对均质和条带非均质仿真微观模型,设计不同的注采系统,进行水驱油实验研究。实验表明模型的孔隙结构的分布特征和注采系统是影响油水运动规律的主要因素。高含水期水驱油微观驱油机理是:两端被水淹的孔道中的连续油在喉道处被卡断形成油滴被流动的注入水携带驱出;改变压力场的压力分布,使在水淹区内某些孔隙或孔隙群中的驱替压力差足以使其中的不动剩余油变成可动油被驱替采出。

Study on the microscopic water displacing oil mechanism experiment of high water-cut oil field

Using the pore structure characteristics analyzed from rock samples of high watercut oil field,making relative homogeneous and banded heterogeneous simulation microscopic model,designing different injection-production system,this paper has done a study on water flooding experiment.The results indicated that the pore structures distribution and injection-production system are the main effect on oil and water movement.The microscopic water displacing oil mechanism at high water cut stage is:continuous oil in the two ends flooded channel is interrupted and forms emulsified oil,which is carried out by the injected water; by changing the pressure distribution in water flooded area,pressure difference could make the fixed remaining oil produced as movable oil in some of the pore and pore group.