改善聚合物驱后续水驱开采效果分析——以孤岛油田中一区Ng3为例

Analysis of improving waterflooding effects after polymer flooding-taking Ng3 of central regionl of Gudao Oilfield as an example

为了确保聚合物驱后续水驱阶段的增油效果,针对其动态变化特点,提出了这一阶段的调整措施。研究结果表明,后续水驱应保持合理压力场;开展分层注水方式可以有效地控制含水上升速度;根据油井动态变化特点,采取油井分类管理方法,可延长降水增油效果;应结合矿场实际情况,适时开展后续水驱整体注采调整,探索提高采收率的新方法。在孤岛油田中一区Ng3聚合物驱的矿场实践中,取得了较好的开发效果。

In order to ensure the stimulation of waterflooding after polymer flooding,a serial of adjustment measures are presented according to the performance in sequent waterflooding. The results indicate that appropriate pressure field should be preserved in the process of sequent water flooding. The rising speed of water cut can be controlled effectively by the way of separated-zone water injection. Also, managing classified oil wells according to the characters of their dynamic variation can prolong the time of improvement. At the same time, the detailed circumstance of the blocks where sequent water flooding after polymer flooding has been considered, macroscopic injection and production relationship should be adjusted. Also,EOR methods for water flooding after polymer flooding should be actively explored. Good development result was achieved in field application of Ng3 of central regionl of Gudao Oilfield with these suggestions.