Hu Jie, Li Aifen
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.
ACS Omega. 2021 Apr 1;6(14):9362-9367. doi: 10.1021/acsomega.0c05089. eCollection 2021 Apr 13.
Both polymer injection time and injection rate play an important role in the development of an offshore reservoir with a limited service life of the platform. To quantitatively and qualitatively investigate the influence of the formation packing sequence, injection rate, polymer injection timing, and their interaction on the performance of polymer flooding, a numerical reservoir model is simulated in this study based on the properties of offshore reservoir LD in China. Also, the polymer flooding experimental scheme is designed according to the response surface method and single-factor analysis method. Based on numerical simulation and statistical analysis, a regression model is established to predict the incremental oil recovery factor of polymer flooding. The analysis of variance (ANOVA) shows that the regression model fits well with the experimental data. The three factors' influence capacities on the increased oil recovery factor from large to small are the injection rate, formation rhythm, and injection timing. From the analysis, it is also found that the improved polymer flooding performance can be achieved under an injection rate of 0.07-0.09 PV/a and an injection timing of 30% water cut for positive rhythm formation.
聚合物注入时间和注入速率对平台使用寿命有限的海上油藏开发都起着重要作用。为了定量和定性地研究地层充填顺序、注入速率、聚合物注入时机及其相互作用对聚合物驱油性能的影响，本研究基于中国海上油藏LD的特性模拟了一个油藏数值模型。此外，根据响应面法和单因素分析法设计了聚合物驱油实验方案。基于数值模拟和统计分析，建立了一个回归模型来预测聚合物驱油的增油采收率。方差分析（ANOVA）表明回归模型与实验数据拟合良好。这三个因素对提高采收率的影响能力从大到小依次为注入速率、地层韵律和注入时机。分析还发现，对于正韵律地层，在注入速率为0.07 - 0.09 PV/a和含水率为30%时注入聚合物，可实现更好的聚合物驱油性能。
