加拿大油砂非凝析气体辅助SAGD开采特征及影响因素研究  

Research on development characteristics and influencing factors of non-condensable gas assisted SAGD for Canadian oil sand

作　　者：张艳玉[1] 王欣 孙晓飞[1] 王成胜[2] 孙君 任树亮[2] ZHANG Yanyu;WANG Xin;SUN Xiaofei;WANG Chengsheng;SUN Jun;REN Shuliang(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266500,Shandong,China;Drilling&Production En-gineering Institute,China National Offshore Oil Corporation,Tianjin 300452,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266500 [2]中海油能源发展股份有限公司钻采工程研究院,天津300452

出　　处：《河南理工大学学报（自然科学版）》2023年第3期10-17,共8页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家科技重大专项项目(2016ZX05031-002)。

摘　　要：常规SAGD开采蒸汽超覆现象严重、蒸汽腔发育不均匀、后期开发效果差,非凝析气体辅助SAGD开采即SAGP(steam and gas push)可有效改善SAGD开发效果,但SAGP开采机理、开发特征和影响因素仍未完全明确。采用室内实验和数值模拟相结合方法,揭示SAGP开采机理,明确蒸汽腔发育、剩余油分布等开发特征,探讨非凝析气体类型、注入方式、注入时机等因素的影响规律。结果表明:非凝析气体可降低稠油黏度和储层顶部热量损失速率,从而提高稠油可流动性和蒸汽热利用效率;SAGP过程中利用二氧化碳的辅助效果优于甲烷和氮气,尽早注入非凝析气体可形成“椭圆形”蒸汽腔;非凝析气体注入速率为4000 m^(3)/d时效果最好,超过该值非凝析气体会抑制蒸汽腔发育;采用段塞式注入非凝析气体效果优于连续式注入方式,最优段塞长度为2个月。研究结果对于加拿大油砂SAGP高效开发具有重要意义。Conventional SAGD steam overlap phenomenon is serious,steam chamber development is uneven,and development effect is poor.Non-condensable gas assisted SAGD(steam and gas push,SAGP)technology can effectively improve the SAGD development effect.However,SAGP technical mechanism,development characteristics and influencing factors are still not completely clear.A combination of laboratory experi-ments and numerical simulations was used to reveal the SAGP technical mechanism,to clarify development characteristics such as steam chamber development and remaining oil distribution,and to clarify the influ-ence of non-condensable gas types,injection methods,injection timing and other factors.The results showed that non-condensable gas could reduce the viscosity of heavy oil and the heat loss rate at the top of the res-ervoir,thereby improving the flow ability of heavy oil and the efficiency of steam heat utilization.The auxil-iary effect of using carbon dioxide in the SAGP process was better than that of methane and nitrogen.Inject-ing non-condensable gas as soon as possible could form an elliptical steam chamber to avoid steam overlap.When the injection rate of non-condensable gas was 4000 m^(3)/d,the effect was best,exceeding this value would inhibit the development of the steam chamber;The effect of slug injection of non-condensate gas was better than continuous injection,and the optimal slug length was 2 months.The research results were of great sig-nificance for the efficient SAGP development of in Canadian oil sand.

关 键 词：加拿大油砂 蒸汽辅助重力泄油 非凝析气体 数值模拟 技术机理 开发特征 

分 类 号：TE345[石油与天然气工程—油气田开发工程]