摘要
选用大庆油田一类、二类储层天然岩心的平行样,水测渗透率约1.0,0.6和0.2μm2,通过大量的恒速非稳态法实验,分别测定了水驱至含水率fw为90%,94%和98%时转注聚合物溶液及后续水驱全过程的相对渗透率曲线,分析了不同渗透率、不同转注聚时机对相对渗透曲线的影响.实验结果表明:同等渗透率级别时,越早转注聚其相对渗透曲线两相区跨度越大,残余油饱和度越低;转注聚时机相同时,岩心渗透率越高,油相相对渗透率下降越缓慢,两相区跨度越宽,残余油饱和度降低.
Considering the actual situation which polymer is injected when the water-cut of water flooding is up to a certain degree during the development of oilfields,select three kinds of representative parallel natural core samples from first and second degree reservoirs in Daqing Oilfield,which water permeability are about 200,600,1 000 millidarcy,and through large of the unsteady-state method of constant injection rate;measure the relative permeability curves of the whole process of water flooding up to water-cut 90%,94%,98%,then polymer flooding,sequent water flooding;analyze the effect of permeability and transfer time of polymer flooding to the relative permeability curves.The results show that with the same permeability level,the earlier transferred to polymer flooding,lead to the larger of the span of two-phase region in relative permeability curves,the lower of the residual oil saturation;with the same transfer time,the higher the core permeability is,the slower the oil-phase relative permeability decreases,the broader of two-phase region,the lower of the residual oil saturation.
出处
《东北师大学报（自然科学版）》
CAS
CSCD
北大核心
2010年第4期87-91,共5页
Journal of Northeast Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(50634020)
黑龙江省杰出青年基金资助项目
关键词
室内实验
相对渗透曲线
非稳态法
影响因素
聚合物驱
全过程
渗透率
转注聚时机
laboratory experiment
relative permeability curve
unsteady-state method
affecting factor
polymer flooding
full term
permeability
transfer time of polymer flooding
