Experimental evaluation of ASP flooding to improve oil recovery in heterogeneous reservoirs by layered injection approach
Experimental evaluation of ASP flooding to improve oil recovery in heterogeneous reservoirs by layered injection approach
复制标题
非均质油藏分层注入三元复合驱提高采收率实验评价
DOI：
10.1002/ese3.735
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发表时间：
2020-05-25
影响因子：
3.8
通讯作者：
Wang, Li
中科院分区：
文献类型：
--
作者：
Huang, Bin;Hu, Xinyu;Wang, Li
为提高三元复合体系（ASP）溶液在非均质油藏中的驱油效果，在大庆油田首次提出了分层注入技术。该技术在高渗透油层采用分压工具控制三元复合溶液注入量，在低渗透油层采用分质工具。为研究分层注入技术的实验效果，首先建立了不同渗透率、分子量、浓度的三元复合溶液与阻力系数、残余阻力系数之间的关系，然后建立分层注入实验模型，进行了注入能力和驱油能力的实验研究。实验结果表明，岩心渗透率变化范围越小，ASP溶液的分子量和浓度越大，ASP溶液的注入能力越差。分压工具和分质工具作用后，三元溶液的注入能力得到不同程度的提高，低渗透率岩心的驱油效果明显改善，总采收率提高，不同条件下非均质岩心的总采收率提高1.4%-4.05%。该实验对提高非均质油藏采收率的研究具有重要意义。
To improve the oil displacement effect of ASP (alkali/surfactant/polymer) solution in heterogeneous oil reservoirs, layered injection technology is proposed for the first time for Daqing Oilfield. The technology uses partial pressure tools to control the injection amount of ASP solution in high-permeability oil layers and uses a partial quality tool in low-permeability oil layers. To study the experimental effect of this layered injection technology, the relationships between the different permeability, molecular weight, and concentration of the ASP solution, as well as the resistance coefficient and residual resistance coefficient, are first established, and then, a layered injection experimental model is established to carry out experimental research on injection capacity and oil displacement capacity. The experimental results show that the smaller the range of the core permeability is, the larger the molecular weight and concentration of the ASP solution are, and the poorer the injection capacity of the ASP solution is. After the action of a partial pressure tool and a partial quality tool, the injection capacity of ASP solution is improved to different degrees, and the oil displacement effect of low-permeability cores is significantly improved, while the total oil recovery is increased, and the total oil recovery of heterogeneous cores under different conditions is increased by 1.4%-4.05%. This experiment is of great significance to the study of improving the oil recovery of heterogeneous reservoirs.