The Performance of Polymer Flooding in Heterogeneous Type II Reservoirs-An Experimental and Field Investigation
The Performance of Polymer Flooding in Heterogeneous Type II Reservoirs-An Experimental and Field Investigation
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DOI：
10.3390/en10040454
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发表时间：
2017-04
期刊：
影响因子：
3.2
通讯作者：
H. Zhong;Weidong Zhang;Jing Fu;Jun Lu;H. Yin
中科院分区：
文献类型：
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作者：
H. Zhong;Weidong Zhang;Jing Fu;Jun Lu;H. Yin
聚合物驱油工艺已应用于中国大庆油田的中渗透Ⅱ类油藏以提高采收率。然而，该工艺面临诸多挑战，例如驱油效率、高注入压力、地层堵塞和损害、吸液不均衡以及经济合理性等问题。在本研究中，进行了单相和两相流实验以研究聚合物注入对Ⅱ类油藏天然岩心的适应性。通过物理模拟实验研究了聚合物提高采收率（EOR）的效果，并给出了在实际油田应用的结果。结果表明，在聚合物驱中，流动特性和注入能力受油藏渗透率主导。此外，在Ⅱ类油藏中，反映地层损害的聚合物分子吸附和注入压力梯度受浓度的影响比受分子量的影响更为显著。利用匹配关系，注采过程稳定，在高含水饱和度的非均质Ⅱ类油藏中可获得10% - 15%的新增采收率。这项工作意义重大，因为它进一步加速了聚合物驱提高采收率技术在高含水饱和度的中渗透非均质油田中的应用。
The polymer flooding process has already been applied to the medium permeability type II reservoirs of the Daqing Oilfield (China) to enhance oil recovery. However, this process faces a number of challenges, such as the flooding efficiency, high injection pressure, formation blockage and damage, unbalanced absorption ratio, and economical justification. In this study, single-phase and two-phase flow experiments are performed to investigate polymer injection adaptability with natural cores of type II reservoirs. The enhanced oil recovery (EOR) effects of the polymer are studied by physical simulation experiments, and the results of application in an actual field are also presented. The results indicate that the flow characteristics and injection capability are dominated by the reservoir permeability in polymer flooding. Moreover, the adsorption of polymer molecules and the injection pressure gradient, which reflect formation damage, are affected more significantly by the concentration than by the molecular weight in type II reservoirs. Using the matching relationship, the injection-production process is stable, and additional oil recoveries of 10%–15% can be obtained in heterogeneous type II reservoirs with a high water saturation. This work is significant in that it further accelerates the application of polymer flooding EOR in medium permeability heterogeneous oilfields with high water saturation.