杜84块兴Ⅵ组SAGD先导试验区经过8年开发,水平生产井水平段上覆储量采出程度已达70%,进入SAGD开发后期,存在问题较多,主要表现为蒸汽腔压力高、蒸汽用量大,蒸汽腔热损失大、热能利用率低,蒸汽腔进入下降阶段、泄油效率低,且油汽比降至0.15,继续采用SAGD开发已不经济。为改善兴Ⅵ组SAGD先导试验区效果,探索利用SAGP(Steam And Gas Push)方式,向蒸汽腔注入氮气,利用氮气填充蒸汽腔,从而减少蒸汽注入量、降低热损失、提高泄油效率,改善油汽比。根据兴Ⅵ组SAGD先导试验区实际情况,对蒸汽及氮气注入量等参数设计优化,最大限度减少蒸汽用量,提高油汽比,方案设计油汽比由0.15提高至0.30。经过半年的现场实施,试验区各项开发指标明显改善,油汽比达到0.33;监测资料显示汽腔顶部形成低温氮气层,有效降低了热损失;措施实施后已累计创效1402万元。SAGP的成功实施为后SAGD阶段探索出可行的接替技术。 Du 84 Block Hing Group SAGD pilot test area after eight years of development, the level of horizontal production wells overlying reserves of the level of mining has reached 70%, into the late SAGD development, there are more problems, mainly for the steam chamber pressure is high, steam Large amount of steam heat loss, heat utilization is low, the steam chamber into the descending stage, low drainage efficiency, and the oil vapor ratio dropped to 0.15, continue to use SAGD development has been uneconomical. In order to improve the effect of SAGD pilot zone in Xing Ⅵ group, the paper explores the use of SAGP (Steam And Gas Push) to inject nitrogen into the steam chamber and fill the steam chamber with nitrogen to reduce the steam injection amount, reduce the heat loss, improve the drainage efficiency and improve Oil steam ratio. According to the actual conditions of Xing pilot group SAGD, the parameters of steam and nitrogen injection were designed and optimized to minimize the steam consumption and increase the oil-steam ratio. The ratio of oil-steam ratio was increased from 0.15 to 0.30. After six months of on-site implementation, the development indicators of the pilot area have been significantly improved with an oil-vapor ratio of 0.33. Monitoring data show that the formation of a low-temperature nitrogen layer at the top of the steam chamber effectively reduces the heat loss. After the implementation of the measures, a cumulative effect of 14.02 million yuan has been achieved. The successful implementation of SAGP explored viable alternative technologies for the post-SAGD phase.