摘要
分别从地质和工艺方面分析了聚合物驱过程中发生窜流的原因,通过室内物理模拟实验考察了相关因素对聚合物驱窜流的影响,并提出了防窜对策。研究结果表明,渗透率级差越小,注聚后低渗透层的采收率越高,随着渗透率级差的增大,高渗透层的窜聚现象更严重,在聚合物驱层系组合时,应尽量降低层系内的渗透率级差;注聚过程中存在最佳的聚合物溶液浓度范围,在此浓度范围内聚合物驱的采收率最高,驱油效果最好;采用合理的注聚速率,不仅可以延长开发时间,较大幅度地提高采收率,而且可以推迟见聚时间。
The causes for the occurrence of crossflow during polymer flooding were analyzed from geological and technological view points,the effects of relevant factors on the crossflow of polymer flooding agent were studied via laboratory physical simulation experiment,and the measures of preventing crossflow were presented. The results of study have shown that the smaller the permeability contrast is,the higher the recovery efficiency from the low permeability layer to which polymer is injected. As the permeability contrast increases,the crossflow in the high permeability layer becomes worse,and therefore the permeability contrast in the polymer flooding layer series shall be minimized when determining polymer flooding layer series combination. An optimum polymer solution concentration range exists during polymer injection,in which the recovery efficiency is the highest and the effect of oil displacement is the best when polymer flooding is used.The oil recovery period can be extended,the recovery efficiency can be increased substantially,and the polymer breakthrough time can be postponed when reasonable polymer injection rate is adopted.
出处
《精细石油化工进展》
CAS
2016年第1期28-30,34,共4页
Advances in Fine Petrochemicals
关键词
聚合物驱
窜聚
地质因素
聚合物浓度
注聚速率
polymer flooding
crossflow
geofactor
polymer concentration
polymer injection rate
