【摘要】 腰英台油田为低孔特低渗透油藏,油井自然产能低,压裂后含水高,无效井和低效井比例大、采油速度低,地层压力下降快,采收率低,急需实施有效的提高采收率技术。CO₂驱油作为三次采油的重要手段,能够显著提高特低渗油藏采收率。从腰英台油田地质模型入手,建立储层三维地质模型,利用数值模拟方法,对腰英台油田CO₂驱油开发的关键参数进行优化。结果表明,合理的注入速度为40⁵0 t/d,最佳注入量为0.8 HCPV,最优生产井流压6⁷ MPa,系统注入压力20 MPa,且在条件允许的情况下,可以停产2月注气恢复压力,同时注入半年后视生产情况补孔采油。更多还原

【Abstract】 Yaoyingtai oilfield is a low porosity and ultra- low permeability reservoir with low natural productivity,high water cut after fractured,low producing wells or non-producing wells taking a high ratio,low recovery rate,formation pressure dropping quickly and low recovery factor,for which some efficient methods to raise recovery factor should be carried on. As an important EOR method,CO₂ flooding can increase recovery significantly. From geological model of Yaoyingtai oilfield,the three dimension geological model is built,and by using numerical simulation method,the key development parameters of CO₂ Flooding in Yaoyingtai are optimized. The results show that 40-50 t / d is the proper gas injection rate,0. 8 HPCV is the optimized cumulative volume,6- 7 MPa is the reasonable BHP,and injection pressure should be 20 MPa. Under specific condition,producers should be shut-in for 2 months during gas injection and after a half year of injection,perforations adding should be taken.更多还原