Optimization of Injection Parameters of Adaptive Flooding System after Polymer Flooding

doi:10.3969/j.issn.1006-396X.2021.05.009

Abstract

Abstract:

In order to further improve the recovery of reservoir after polymer flooding, the concentrations of pre?crosslinked gel particles (PPG) and three component composite systems were optimized in the adaptive system after polymer flooding through the laboratory investigation. The experimental results show that, when PPG concentration and polymer concentration are 400 and 1 200 mg/L, and injection volume is 0.5 PV in the adaptive system, the self?adaptive flooding system after polymer flooding further enhanced the oil recovery by 18.25%, and the total oil recovery reached the best of 71.2%. Compared with polymer flooding stage, the cumulative imbibition ratio of high permeability layer decreased by 15.00%, the cumulative imbibition ratio of medium and low permeability layers increased by 6.50% and 8.97%, respectively. The recovery of medium and low permeability layers increased by 5.07% and 9.49% respectively, the recovery rate of high permeability layer only increases by 3.63%. It can be seen that the optimized system can play a better role in profile control.

Key words: After polymer flooding, Adaptive architecture, Injection parameters, Optimization parameters

摘要：

为了聚驱后进一步提高油藏采收率，通过室内实验方法，对聚驱后自适应体系中预交联凝胶颗粒（PPG）和三元复合体系的质量浓度进行了优化研究。结果表明，当自适应体系中PPG质量浓度为400 mg/L、聚合物质量浓度为1 200 mg/L、注入量为0.5 PV时，聚驱后自适应驱油体系进一步提高采收率18.25%，总采收率达到71.2%，效果最优；与聚驱阶段相比，高渗层的累积吸液比例降低15.00%，中、低渗层累积吸液比例分别增加6.50%、8.97%；中、低渗层采收率分别增加5.07%、9.49%，高渗层采收率增加3.63%。可见优选体系可以起到更好的调剖作用。

关键词: 聚驱后, 自适应驱油体系, 注入参数, 优化参数

CLC Number:

TE343

Li Liu, Yingxue Ma, Ruibo Cao, Shixin Zhou, Zhihao Li. Optimization of Injection Parameters of Adaptive Flooding System after Polymer Flooding[J]. Journal of Petrochemical Universities, 2021, 34(5): 56-61.

刘丽, 马映雪, 曹瑞波, 周士新, 李志浩. 聚驱后自适应驱油体系注入参数优化[J]. 石油化工高等学校学报, 2021, 34(5): 56-61.

Figures/Tables 8

Fig.1 Oil displacement mechanism of adaptive system

Fig.2 One dimensional long homogeneous core model

Fig.3 Three pipe parallel core model diagram

Fig.4 Variation curve of injection end pressure with multiple of injected pore volume

Fig.5 Relationship curve between EOR and polymer concentration and PPG concentration

Fig.6 Cumulative imbibition ratio of high, medium and low permeability layers under different PPG concentrations

Fig.7 Shunting rate curve and dynamic mining curve of the optimized self?adaptive system

Fig.8 Comparison of flow diversion rate and oil recovery of each layer after optimization of parameters

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