河道砂油藏注水初期“间注间开”技术应用

Intermittent water flooding and oil production applied in channel sandstone reservoirs during early water flooding

刘洪发 王凤英 张伟 张淑会 何雪芹

Liu Hongfa Wang Fengying Zhang Wei Zhang Shuhui He Xueqin

中国石化西北油田分公司采油一厂, 新疆轮台 841600

No.1 Oil Production Plant, SINOPEC Northwest Company, Luntai, Xingjiang 841600, China

河道砂岩油藏纵向及平面非均质性均较强。局部发育边水,规模小,主要以弹性驱动为主,开采后期地层亏空严重,能量供应不足,注水补充能量是必然趋势。注水初期,注水方式的选择对注水开发起着举足轻重的作用。常规连续注水初期有效但容易发生水窜,后期改为周期注水效果差。对河道砂油藏初期注水提出了试验"间注间开"注水技术,即在注水井注水过程中油井停止生产,待能量补充到位后确定开井时机,将注水井停注,恢复油井生产。

Channel sandstone reservoirs are small reservoirs with edge water, and have a strong heterogeneity both vertically and horizontally. Elastic drive is a common way in production. Water flooding is necessary during late production period because that formation pressure is insufficient. Conventional continuous flooding works well during early period; however, water breakthrough often takes place. The effect of cyclic water flooding during late period is poor. We propose a new method named "intermittent water flooding and oil production". When water is injected, oil wells stop producing until formation pressure is high enough. And then, water injection stops, and oil production goes on.

https://doi.org/10.11781/sysydz2015S1082