The crude oil in O72&O73 reservoirs of Plutonio oil field has good properties and low volatility. The saturation pressure of reservoirs is very near to the initial formation pressure. Injecting fluid to maintain the formation pressure is an effective way to enhance the recovery of this kind of reservoir. Analyzing the balance between injecting and producing and flooding effects of different injecting fluids will be helpful for adjusting injection volume timely and enhancing the development performance. Studies on the ratio of injection-production show that there is fluid communication between two reservoirs. Research on relative permeability curves and the simulation model show that the water-flooding has higher oil displacement efficiency and the gas-flooding sweeps larger area. Both water and gas are injected to maintain the reservoir pressure since the very beginning of the development in field. It turns out that, after 3 years production, the recovery degree of two reservoirs is up to 18.5% and 10.9% respectively, with the average production rale of 3.3% and 5. 5%.%Plutonio油田为原油性质较好、地饱压差较小的弱挥发性黑油油藏,人工注入流体、保持地层压力开采是此类油藏提高采收率的重要手段.正确分析油藏注采平衡状况,认识不同注入流体的驱油效果,有利于及时调整注入量,达到提高开发效果和采收率的目的.通过注采比及地层能量分析,认为该油田O72油藏和O73油藏之间有流体交流及能量补充；相对渗透率曲线及数值模拟研究表明,该油田水驱油效率比气驱油效率高15％ -23.1％；剩余油研究也表明,水驱油效率高于气驱,但气驱波及范围大于水驱.实际生产中采取同时注水、注气的开采方式,投产3a,2个油藏的采出程度分别达到18.5％和10.9％,采油速度达到3.3％ ～5.5％,获得了较好的开采效果.
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