摘要
在凝胶处理后 ,油 /水相相对渗透率均大幅度下降 ,可动饱和度范围明显缩小 ,弱凝胶的易屈服性导致渗透率随流速增加而上升。凝胶处理使油 /水相渗透率产生不均衡减少是由于油在通过凝胶时部分残余油占据的孔隙形成了新的流动通道 ;但水驱时 ,由于油 /水界面张力较高 ,残余油形成的大部分通道关闭。所以 ,在同样的驱动力下油 /水通过凝胶处理后的含油地层时 。
The oil/water relative permeability (K ro /K rw ) decreases significantly and the range of movable saturation becomes narrow after the gel treatment in oil_bearing porous medium.The permeability of each phase rises with the increase of flow rate because the weak gel is easy to yield and deform.One of the mechanisms for disproportionate permeability reduction (DPR) is that a new flow path will be produced with the residual oil when oil flows through oil_bearing porous medium treated by the gel.But in water flooding,most paths formed by residual oil will be in shutdown due to high interfacial tension between oil/water phase.Therefore,K ro is higher than K rw when fluids flow through at the same pressure.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2002年第3期69-72,共4页
Acta Petrolei Sinica
基金
中国石油化工集团公司重点科技攻关项目 (P990 31 )
