注水井暂堵酸化改善吸水剖面技术研究

Research of improving technology profile by water injection well temporary acidizing

针对注水井由于油层较厚非均质性严重,单层注水吸水剖面显示尖峰状吸水的问题;针对注水井存在两个以上射孔段,由于射孔段间油层物性存在渗透率差异,出现一层不吸水或吸水较差,同时由于射孔段间距过小,无法进行分注或封隔器分隔酸化的问题,建立了注水井暂堵酸化工艺技术,在酸化前先注入暂堵剂,暂堵高渗层或高渗带,使后续酸液有效作用于不吸水的低渗层段或吸水较差的低渗带,达到改善吸水剖面的目的。通过该技术的实施,对于开发非均质低渗透油田,提高油田的最终采收率,具有极为重要的现实意义。

Based on injection Wells, thicker layers due to the problem of serious heterogeneity, single water injection profile shows peak shape of water; There are two more for injection Wells, due to the gun perforation position gun perforation position between petrophysical property, there appeared a layer of permeability of absorbing water, or worse, because small spacing gun perforation position, unable to separate injection or seals disjunctive acidification, established the injectors temporary plugging technology in acidification process before acidification into temporary plugging agent, temporary plugging hypertonic or higher, make the subsequent acid was not bibulous the low permeable layer or low bibulous with low permeability, improve injection profile purposes. Through the implementation of technology to develop heterogeneity low permeable oilfield, improve oilfield, the ultimate recovery has very important practical significance.