稠油油藏注蒸汽和烟道气数值模拟研究

Numerical simulation of steam plus flue gas injection in heavy oil reservoir

为提高克拉玛依油田九6区特稠油蒸汽吞吐后期及转蒸汽驱开发效果,进行了注蒸汽添加锅炉烟道气机理、地质参数敏感性、注采参数优化和经济评价等研究。研究结果表明:在适宜的油藏条件下,蒸汽加烟道气吞吐和蒸汽加烟道气驱比单纯的蒸汽吞吐和蒸汽驱效果都有明显的改善。蒸汽吞吐后期加锅炉烟道气可使该区吞吐周期延长2～4轮次,单井产量提高1459 l,采出程度提高7.02%;蒸汽驱过程中添加烟道气可使采出程度提高3.7%。

In order to improve development effect of cyclic steam stimulation in late period and steam drive for extra heavy oil in Jiu 6 block of Karamay oilfield, studies have been carried out for mechanism of steam plus flue gas injection, sensitivity of geological parameters, optimization of injection - production parameters, and economic evaluation. The results of these studies show that under suitable reservoir conditions , the effectiveness of cyclic steam plus flue gas stimulation and steam plus flue gas drive have shown distinct improvement than that of straight cyclic steam stimulation and steam drive. By adding flue gas in the late period of cyclic steam stimulation, the number of cycles may increase 24, single well production increase 1 459 t, and the recovery percent of reserves improve 7 .02 % ; if adding flue gas during steam drive, the recovery percent of reserves may increase 3.7%.