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底水油藏在国内外油藏中普遍存在。应用人工夹层、采水消锥等技术都有一定的局限性[1],而泡沫具有遇油消泡,遇水稳定的性能,具有很高的研究推广价值,因此本文针对底水碎屑岩油藏,在中高含水期,以国内某区块为例,进行了氮气泡沫驱的数值模拟研究,利用正交设计方法设计了25套采油方案,通过经济评价优选出其中净现值最大的方案,在此方案的基础上进一步进行了注入周期的优选,得出最佳方案为:对T908H南支,T908H北支,T906H同时注氮气泡沫,以7.2×104 m3/d的注气速度和180 m3/d的注液速度注入100万方氮气,注入泡沫浓度1%,每2年一个周期进行生产。
Bottom water reservoirs are widespread in domestic and overseas reservoirs. The application of artificial sandwich, water coning cone and other technologies have some limitations [1], and foam with oil anti-foaming, water stable performance, with a high research and promotion value, so this article for bottom water clastic rock In the middle and high water-cut period, taking a certain block in China as an example, numerical simulation of nitrogen foam flooding was carried out. Orthogonal design method was used to design 25 sets of oil recovery schemes. Through economic evaluation, the best net present value Based on this scheme, the optimal injection cycle was further optimized. The best solution was as follows: Nitrogen bubble was injected into the T908H South Branch, T908H North Branch and T906H simultaneously with the injection rate of 7.2 × 104 m3 / d and 180 m3 / d injection rate of 1,000,000 injection of nitrogen into the foam concentration of 1%, every two years to produce a cycle.