渤海湾裂缝性稠油油藏合理开发方式

渤海湾潜山裂缝性稠油油藏为具有储集层裂缝发育、流体黏度大、埋藏较深等特点的海上油藏。如果常规热采开发,注入蒸汽的热损失大;如果冷采开发,较大的原油黏度会导致驱油效率和波及效率较低,合理开发难度很大。针对此类油藏特点,采用室内物理实验和油藏工程相结合的方法,应用大尺度物理模型,对目标油田冷水驱、热水驱以及热水加表面活性剂驱等开发方式的开发机理和适应性进行研究,并应用实际地质模型对合理开发方式进行验证。结果表明,采用热水加表面活性剂的开发方式,开发效果最好,其余依次为热水驱、冷水驱、蒸汽驱和蒸汽吞吐。综合对比开发效果和经济效益,最终推荐目标区采用热水驱开发方式。

Development mode of fractured heavy oil reservoirs in Bohai Bay

The development difficulties of buried-hill fractured heavy oil reservoirs in Bohai Bay are mainly caused by fracture,heavy oil,deeply buried and offshore reservoir,etc.For normal development,because the reservoir is buried deeply,the heat loss of steam is very large.If we use the development of cold production,great crude oil viscosity will lead to lower oil recovery efficiency and sweep efficiency,which will cause great development difficulty.In view of the characteristics of the reservoirs,the adaptability of water flooding,hot water and hot water plus surfactant flooding were studied using the method of physical simulation,reservoir engineering and numerical simulation.The results show that the development of hot water plus surfactant has the best development effect,followed by hot water flooding,cold water flooding,steam flooding and steam stimulation.Comprehensive comparison of the development effect and economy,hot water flooding is recommended to develop such reservoirs finally.