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.