聚合物驱剖面返转规律及驱油效果实验研究

聚合物驱油过程中的注入剖面变化是在注聚初期,其吸水剖面与水驱基本相同,聚合物溶液还是主要进入高渗透层,随着高渗透层渗流阻力的增加,聚合物溶液开始进入低渗透层,注入剖面得到改善。随着低渗透层聚合物溶液的不断进入,其渗流阻力增加,导致其吸水逐渐下降,吸水剖面出现返转。本文通过大量的物理模拟实验和理论分析,研究了聚合物驱油过程中的吸水剖面返转规律,说明了剖面返转是一种聚合物驱油过程中的必然规律,渗透率级差、聚合物分子量和浓度都是影响剖面返转规律的重要因素,研究了渗透率级差、聚合物分子量和浓度对提高采收率的影响规律。

Experimental research on changing laws of the profile reversal and oil-displacement efficiency of polymer flooding

At the Beginning of the changing in the injection profile during the period of polymer flooding, the changing rule is similar to the ones occurred in water flooding.That is to say,the polymer solution be pushed into the higher permeability layers first then to the lower ones as the flow resistance increasing in the higher permeability layers and results the improvement of the injection profile.As the more polymer solution be entered to the lower permeability layers,the much resistance to be gotten.Consequently,the proportion of water intake be declined and the peak value of the profile begin to reverse.According to the results the research in the laboratory and theory analyse.the changing rule during the period of polymer flooding are researched,and cocluded to the result that the profile chang is inevitably rule.