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Feasibility Study of Secondary Polymer Flooding in Henan Oilfield, China

机译：河南油田二次聚合物驱的可行性研究

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After polymer flooding, it is necessary to find relay technology to retain oil yield. In this paper, laboratory experiments were conducted to investigate feasibility of secondary polymer flooding, in which injecting more polymer with higher concentration and relative molecular mass. It is necessary to determine enhanced recovery range and optimum concentration. With microscopic visible glass physical models, further start up of oil drops with secondary polymer can be observed distinctly. In the mean time, macroscopic heterogeneous core tests were carried out with permeability range of 2, 5 and 8. Polymer concentration effective and economical for flooding is optimized. Ii is shown that 3%~8% of further enhanced recovery and 20% decreased water cut can be obtained, and water profile can be improved to some extend after secondary polymer flooding. Thence, it is proved that secondary polymer injection after primary polymer can indeed further improve recovery and the technology of secondary flooding is feasible. Moreover, laboratory optimum concentration of 2200mg/L is determined. On the basis of laboratory results, from 2007 to 2008, filed trial with above optimum parameters were implemented. Up to 2008.12, water cut decreased from 92% to 83%, and cumulative increased crude oil of 5.71×104t.The success of secondary polymer flooding technology provides reference for the development of oil fields after primary polymer flooding in China and other regions in the whole world.
机译：聚合物驱后，有必要寻找中继技术来保持石油产量。在本文中，进行了实验室实验以研究二次聚合物驱的可行性，其中注入更多具有更高浓度和相对分子质量的聚合物。有必要确定提高的回收率范围和最佳浓度。使用微观的可见玻璃物理模型，可以清楚地观察到含第二种聚合物的油滴的进一步启动。同时，进行了渗透率范围分别为2、5和8的宏观非均质岩心测试。优化了驱油有效和经济的聚合物浓度。结果表明，在二次聚合物驱后，可获得3％〜8％的进一步提高的采收率和20％的降低的含水率，并且可以改善水的分布。因此，证明了在一次聚合物之后注入二次聚合物确实可以进一步提高采收率，并且二次驱技术是可行的。此外，确定的实验室最佳浓度为2200mg / L。根据实验室结果，从2007年至2008年，采用上述最佳参数进行了归档试验。截止2008.12年，含水率从92％下降到83％，原油累计增加5.71×104t。二次聚合物驱技术的成功经验为我国及其他地区一次聚合物驱后的油田开发提供参考。全世界。

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