The Daqing Oilfield Sazhong Development Zone with the Gas-oil Ratio

Abstract In the late stage of super high water cut development in Sazhong Development Zone, oilfield rules have changed, showing a significant increase production gas-oil ratio. To study factors and laws ratio change, laboratory research on oil/gas/water high-pressures physical properties, field test for single layer development, theoretical calculation modified oil-gas were carried out. The results show that partially dissolved gas can be obtained from saturated crude oil by injecting or polymer solution. ultra-high period, especially when rises to 95%, will rise sharply due influence water. At same time, ground saturation pressure difference is also an important factor affecting recovery factor. Therefore, process analyzing ratio, it necessary gas-water chemical flooding stage.