可动凝胶纵向非均质物理模拟研究

由于注入水的长期冲刷,储集层的孔隙结构及物理性质发生了变化,层间和层内的非均质性加剧,影响后期开发效果。可动凝胶能调整地层的非均质性,在纵向非均质摸型上进行可动凝胶油藏物理模拟实验,通过布置高精度的压差传感器,了解可动凝胶体系调整非均质地层渗透率和压力场动态分布的能力,对比水驱、聚合物驱和可动凝胶封堵对采收率的影响。结果表明,可动凝胶封堵比水驱提高采收率8.7％,比聚合物驱提高采收率1.6％。由压力场变化分析可知:聚合物驱确实能改变油藏内流体流动方向,提高波及范围,驱替出水驱不能波及到的低渗透油藏内的油;可动凝胶成胶后,封堵高渗区,可改变油藏内流体流动方向,进一步提高采收率。图9表1参5

Experimental investigation of CDG fluid in he-terogeneous physical model

Experimental investigation has been conducted on CDG (Colloidal Dispersion Gels) fluid in heterogeneous physical model,the effects of water flooding, polymer flooding and CDG flooding on FOR are systematically compared. Pressure transducers with high accuracy were installed in the model, and the fluid flow variation in the reservoir was observed. The tests show that polymer flooding enhanced oil recovery 8.7% more than water flooding, and 1.6% more than polymer flooding. According to pressure variation, it is clear that the fluid flow direction could be changed by polymer flooding, expanding sweep region and displacing oil from the low permeabil-ity regions. After CDG became colloid, the high permeability regionscould be plugged, the fluid flow direction changed and oil recoveryenhancement would be achieved.