中文摘要：

稠油底水油藏经过多轮次蒸汽吞吐所形成的加热范围为受热降黏后的原油提供了流动空间，但同时容易造成底水的快速锥进。基于氮气控制底水锥进以及提高原油采收率的机理分析，把注氮气压水锥的过程简化为气驱油和油驱水两个过程，利用物质平衡法对多轮次蒸汽吞吐后稠油底水油藏的氮气压水锥工艺进行了研究，得到了蒸汽吞吐加热范围内注氮气过程中油气界面、油水界面、注入氮气的启动油量以及原油富集带体积的计算方法。对胜利油田某底水稠油生产井的氮气压水锥过程进行了相应计算，由计算结果可知：以600、900和1200m^3／h（标准状况）的注氮速度分别注氮20、13和10d可以将水锥压回原始油水界面，富集油带厚度分别达到12.45、12．14和12．45m，实现抑制水锥再次锥进和增加原油产量的目的。

英文摘要：

Nitrogen anti-water-coning is simplified into two processes of gas driving oil and oil driving water based on the mechanisms of nitrogen repressing water coning and enhancing oil recovery. Material balance method is employed to study nitrogen anti-water-coning technology in heavy oil reservoirs with bottom water and multi-periodic steam huff and puff. The calculation methods of gas-oil contact, water-oil contact, the oil volume enabled by injected nitrogen and the formation volume of enriched oil zone are established. The methods are applied to a production well of heavy oil reservoir with bottom water in the Shengli Oilfield, showing that injecting nitrogen for 20 days, 13 days and 10 days can push water coning to the original water-oil contact at nitrogen injection rates of 600, 900 and 1 200 ms/h （standard conditions）, respectively. The technology can effectively control water coning and increase oil production during effective periods.