摘要
对于存在大型窜流通道的强非均质性油藏,单独实施聚驱易造成聚合物的无效驱替,因此需要在聚驱前实施调剖。文章利用三层非均质岩心模拟具有大型窜流通道的强非均质油藏,采用改性淀粉强胶开展聚驱前调剖的室内实验研究,结果表明,通过调剖,后续聚驱阶段比单独聚驱采收率增幅更大,而总采收率可以增加30%以上;调剖剂段塞越接近油水前缘,后续流体波及体积越大,而段塞超过油水前缘以后,后续驱替液的波及范围基本相同,因此将调剖剂段塞"定位"在油水前缘,就可以实现最佳的封堵效果;调剖时机不同,油水前缘的位置不同,可以通过调整后续顶替段塞的大小来实现调剖剂段塞的准确定位。
In strong heterogeneous reservoir with big channeling path, single polymer flooding often brings ineffective displacement of polymer, so the profile control is need before polymer flooding. In this paper, nonhomogeneous core models with three layers were employed to simulate the strong heterogeneous reservoir with channeling path, in which the laboratory experimental research on the profile control before polymer flooding was carried out using the modified starch robust gel. The results showed that: by means of profile control, the incremental recovery rate of follow-up polymer flooding was larger than that of the single polymer displacement, and the total recovery ratio could increase about 30%; the closer the plugging agent slug was away from the water/oil front, the bigger the follow-up fluid could sweep, but when the plugging agent slug exceeded the water/oil front, the sweeping range of follow-up fluid was almost identical, so if the plugging agent slug could be 'fixed' in the water/oil front, the optimum blocking effect could be gained. If the time for profile control is different, the water/oil front locates in different position, and the exact position fixing can be achieved by adjusting the size of follow-up displacement slug.
出处
《钻采工艺》
CAS
北大核心
2013年第1期81-84,13,共4页
Drilling & Production Technology
基金
国家科技部重大专项"低渗透油田开采后期提高采收率新技术"(项目编号2011ZX05009-004)
关键词
聚合物驱
定位调剖
段塞
含水率
采收率
polymer flooding, fixed position profile control, slug, water content ratio, recovery ratio
