氮气辅助蒸汽驱强化传热机理及成因探讨  

Heat Transfer Enhancement Mechanism and Genesis of Nitrogen-Assisted Steam-Flooding

作　　者：王一平[1] Wang Yiping(Sinopec Shengli Oilfield Branch Company, Dongying , Shandong 257015, China)

机构地区：[1]中国石化胜利油田分公司,山东东营257015

出　　处：《特种油气藏》2018年第2期134-137,共4页Special Oil & Gas Reservoirs

基　　金：中国石化科研项目"稠油高轮次吞吐后提高采收率技术"(P16010)

摘　　要：为探讨氮气辅助蒸汽驱强化传热机理及成因,开展了氮气强化蒸汽传热实验、氮气影响蒸汽冷凝实验。通过实验对比氮气与蒸汽注入方式的改变对岩心温度分布的影响,总结了氮气的强化传热机理;实验分析了氮气对蒸汽冷凝传热过程的影响,并在此基础上探讨了氮气强化传热的机理成因。研究表明:氮气与蒸汽混注时,氮气存在明显的强化传热机理,该机理可起到"缓释"蒸汽热量、扩大热波及以及提高远端地层温度的作用,其作用效果要强于氮气的隔热作用,且氮气含量的增加有助于强化传热效果的提升;氮气存在强化传热机理,主要是因为氮气能增加蒸汽冷凝过程中的传质传热阻力,降低蒸汽的冷凝传热系数,延缓蒸汽与岩石固体表面之间的热交换速度。实验结果为氮气辅助蒸汽驱开发方式的优化提供了参考。The heat transfer enhancement experiment of nitrogen-assisted steam flooding and steam condensation experiment with nitrogen are carried out to investigate the mechanism and genesis of nitrogen-assisted steam-flood- ing. The effbets of different injection patterns with nitrogen and steam on the core temperature distribution are com- pared to summarize the heat-transfer enhancement mechanism. The effects of nitrogen on the heat transfer process of steam condensation are experimentally analyzed to further discuss the heat transfer enhancement mechanism of nitro- gen. Research indicates that the heat transfer can be greatly enhanced by nitrogen in the mixed injection with nitro- gen and steam, which could release steam heat, expand steam swept volume and increase the temperature of distal formation. The heat transfbr enhancement performance exceeds the effects of nitrogen heat insulation and the heat transfer enhancement perfm＇mance increases with the increase of nitrogen content. The heat transfer enhancement mechanism of nitrogen includes increasing the mass-heat transfer resistance, reducing the steam condensing heat transfer coefficient and slowing the heat exchange rate between steam and rock surface. This experiment research could provider certain reference for the optimization of nitrogen-assisted steam-flooding development.

关 键 词：氮气 蒸汽驱 强化传热机理 机理成因 冷凝传热系数 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]