Research Of Technical Index Of Waterflooded Adjustment With Extra-high Water Cut In Lamadian Oilfield

Lamadian oilfield located on northern part of Daqing placanticline,it is a continental sandstone brachyanticline reservior controlled by tectonism,including some major oil layers such as Sartu,Putaohua,Gaotaizi layer and fault development.Ineffective circling of oil extraction is a fatal problem for the oilfield,the distribution of residual oil is scattered and discontinuous after entering the ultra high moisture content period and it also enhance the difficulty of development adjustment.In order to meet the needs of development adjustment,we consummate the water flooding of ultra high moisture content period combine with practical oilfield development.We use permeability difference,variable coefficient and the thickness of hydrophilic sandstone to construct different layer's boundary of water injection adjustment.We also use numerical modeling to analyze the relationship between recovery percent and injection production strength to ensure new boundary of liquid production rate and improve standards of plane adjustment.We consider about the ratio of injection-production,reasonable reservoir pressure level,moisture content,water consumption rate and pressure recovery rate of oilfield to ascertain reasonable injection production rate and point out some adjustment of down hole process.We find out reasonable reservoir's pressure level,injection production ratio,the boundary of pressure system and the pressure system in optimum recovery efficiency.