七棵树油田低渗透储层改善注水效果分析

七棵树油田注水开发主要存在以下问题:总体注水时机晚,边部常压下难注入水、累积地下亏空大,中部注水纵向上单层突进现象严重、平面上注入水呈指状突进、储量动用不均匀、油井产量递减大。通过对该区地质条件和油井动态资料分析,采用了完善注采井网、超前注水、周期增注、分层注水等措施,生产实践证明,这些措施有效地降低了该区产量递减幅度,改善了水驱效果。

Analysis of improving water injection effect of low permeability reservoir in Qikeshu oilfield

There exists many problems in Qikeshu oilfield,namely too late water injection timing,difficult injection on the edge under normal pressure,serious breakthrough along monolayer in the middle part in vertical direction,fingering dash on the plane,uneven producing reserve degree and quick oil well production decline.Through the analysis on the geological conditions and well data,different measures have been adopted,namely perfected injection-production well pattern,advanced water injection,increased injection cycles and stratified water injection.The production practice has proved that these measures can effectively reduce the production decline rate and improve the water injection effect.