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针对复合韵律性油藏特高含水期剩余油分布的复杂情况,以国内某区块为例,进行了氮气泡沫驱的数值模拟研究。氮气泡沫和水的注入方式分两种:交替注入(类别A)和同时注入(类别B)。对预测的生产指标进行分析,找出影响因素中单井注气量、氮气和泡沫交替半周期、交替轮次是敏感因素,以此进行方案优化,最终得出最适合该区的方案为单井注气量为12000m3/d、氮气泡沫和水交替半周期为30d、交替轮次为2次、起泡剂质量百分数为1%,比水驱方案提高采收率5.72%。
Aiming at the complicated situation of residual oil distribution in compound rhythmic reservoirs during the ultra-high water-cut stage, a case study of a certain block in China was conducted to study the numerical simulation of nitrogen foam flooding. Nitrogen foam and water are injected in two ways: alternating (Category A) and simultaneous (Category B). The predicted production index is analyzed to find the single well gas injection rate, alternate half cycle of nitrogen and foam, and alternate rounds are the sensitive factors, so as to optimize the scheme and finally find the most suitable solution for this area is single well Gas injection volume of 12000m3 / d, nitrogen foam and water alternating half-cycle of 30d, alternate rounds of 2 times, the mass percentage of the foaming agent is 1%, compared with the water recovery program to improve recovery 5.72%.