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目前高浓度聚驱技术已取得突破性成果,提高采收率幅度大幅度增加。高浓度聚驱虽然取得了较好的效果,但化学剂用量大,吨聚增油低,整体效益差。如何在提高采收率的同时提高经济效益,是目前聚驱面临的主要问题。据室内研究结果表明:采用交替注入,可以抑制剖面返转,增加低渗层吸液量,延长聚驱受效时间,从而提高采收率,降低化学剂用量,改善聚合物驱效果。为此开展研究交替注入降低化学剂用量的方法,探索聚驱降本增效和最佳经济效果的途径。
At present, high-concentration poly-flooding technology has achieved breakthrough results and greatly enhanced the recovery rate. Although the high concentration of poly flooding achieved good results, but the amount of chemicals, tons of oil by the low, the overall poor performance. How to improve the recovery rate while improving economic efficiency, is currently poly-drive the main problems facing. According to the indoor research results, it is shown that the alternate injection can inhibit the profile reversal, increase the liquid absorption in the low permeability layer, and prolong the effective time of the poly flooding, thereby enhancing the oil recovery rate, reducing the chemical dosage and improving the polymer flooding effect. To carry out research to reduce the amount of chemicals alternately injected into the method to explore ways to reduce costs and improve efficiency and the best economic results.