气水交替复合驱在高含水油田应用——以QK17-2油田为例

The WAG-surfactant flooding applied in the high-water-cut oil field:taking QK17-2 oilfield as an example

针对油田开发面临高含水、高采出程度及动用程度差问题,为进一步提高类似油藏的采收率,验证气水交替复合驱技术的适用性,在岐口17-2油田开展气水交替复合驱先导试验。根据油藏情况开展气水交替复合驱室内实验研究,室内实验结果表明通过注入聚合物段塞,可以防止气窜,能更好地起到封堵和调驱的作用。实践证实,现场试验井组增油7 000 m3。在非均质油藏油田开发中后期,气水交替复合驱不仅封堵优势渗流通道,而且可以优化注水、恢复地层能量,从而提高油田采收率,为今后海上油田提高采收率事业提供新的技术和发展方向。

Considering the problems existed in oilfield development, such as high water cut,high recovery degree and low producing degree,in order to further improve the recovery rate ol similar reservoirs,verify the applicability of water and gas alternating flooding technology,carry out the gas and water alternate composite flooding pilot test in Qikou 17-2 oilfield. According to the reservoir conditions,the experimental study of indoor gas and water alterna-ting flooding experiment shows that by injecting polymer slug it can prevent gas channeling,playing a better role of plugging and flooding. Practice shows that the field test wells group has increased 7 000 m3 oil. The WAG-surfactant flooding not only plugs preferred path of seepage channel,but also optimizes water injection and recovers the produ-cing energy when the heterogeneous reservoir development is in its middle or late stage, so as to increase oil field recovery and provide new technology and development direction for off-shore oil field from now on.