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海上部分注水开发油田的吸水指数随着含水率的增加呈递减趋势,注入能力的下降、注水井点及注水量的不足将直接影响油田未来的产液量。通过注采系统调整,优化油水井数比可以有效改善水驱效果。在考虑生产压差、安全注水压差及压力保持水平基础上建立了注采系统调整评价方法,定量评价了海上三大类注水开发油田未来注采系统调整潜力。结果表明,注采系统调整的重点在陆相稠油及陆相整装中低黏油田,年增油量可达到(50~260)×10~4m~3。
The water absorption index of offshore partial waterflooding oilfields decreases with the increase of water cut, and the decrease of injecting capacity, insufficient waterflooding well points and waterflooding quantity will directly affect the future production of oilfields. By adjusting the injection and production system, optimizing the ratio of oil and water wells can effectively improve the waterflooding effect. Based on the consideration of production pressure difference, safe water injection pressure difference and pressure maintenance level, a method for adjustment of injection and production system was established, and the potential of future injection and recovery systems for three major waterflooding oilfields at sea was quantitatively evaluated. The results show that the focus of injection and production system adjustment is on the heavy oil in the continental and the low viscosity oil field in the terrestrial packing. The annual oil yield can reach (50 ~ 260) × 10 ~ 4m ~ 3.