非均质油藏水驱后剩余油分布实验研究及潜力评价

发布时间：2018-04-22 15:30

本文选题：非均质油藏 + 水驱　；参考：《科学技术与工程》2017年15期

【摘要】：为更好揭示非均质油藏水驱后剩余油分布规律和动用条件,在冀东油田非均质性强的不同区块中,通过改进电阻率测试含油饱和度的方法,研究了影响电阻率与含油饱和度对应关系的主要因素,开展了在不同非均质性岩心中水驱后聚合物驱的不同位置含油饱和度对比实验。结果表明:渗流速度对饱和水的岩心电阻率曲线影响不大;地层水矿化度对水驱中岩心电阻率影响较大,矿化度从1 629 mg/L增加到3 847 mg/L时,岩心电阻率下降了10~10~2数量级;在矿化度一定条件下,渗透率越低,喉道间彼此连通的概率越小,宏观上的岩心电阻率越高;对于纵向非均质油藏,水驱后开采潜力区域为正韵律分布下中渗层的远井地带和低渗层;且随非均质程度的增强,水驱后该区域开采潜力越大;对于纵向非均质油藏水驱后聚合物驱,使高渗层的含油饱和度从0.55~0.58降低到0.28~0.38,使中渗层含油饱和度从0.87降低到0.58~0.63,降低幅度为33.33%~49.09%;使低渗层的含油饱和度从0.92~0.95降低到0.66~0.83,聚合物驱能很好的携带中高渗层的残余油滴,对低渗层远井地带动用效果较差。
[Abstract]:In order to better reveal the remaining oil distribution and production conditions after water flooding in heterogeneous reservoirs, in different blocks with strong heterogeneity in Jidong Oilfield, the method of oil saturation testing by improving resistivity is improved. The main factors that influence the relationship between resistivity and oil saturation are studied. The oil saturation in different locations of polymer flooding after water flooding in different heterogeneous cores is studied. The results show that the permeability velocity has little effect on the core resistivity curve of saturated water, and the formation water salinity has great influence on the core resistivity in water flooding. When the salinity increases from 1 629 mg/L to 3 847 mg/L, the core resistivity decreases by 10 ~ 10 ~ 2 orders of magnitude. Under certain salinity conditions, the lower the permeability, the smaller the probability of inter-throat connectivity, and the higher the core resistivity in macroscopically. The potential area of exploitation after water flooding is the far well zone and low permeability zone of middle permeability layer under positive rhythm distribution, and with the increase of heterogeneity, the greater the potential of exploitation is after water flooding. The oil saturation of the high permeability layer is reduced from 0.55 ~ 0.58 to 0.28 ~ 0.38, and the oil saturation of the middle permeability layer is reduced from 0.87 to 0.58 ~ 0.63, with a reduction range of 33.33 ~ 49.09, and the oil saturation of the low permeability layer is reduced from 0.92 ~ 0.95 to 0.660.83. The polymer flooding can carry the residual oil droplets of the medium and high permeability layers very well. The effect of remote well driving in low permeability zone is poor.
【作者单位】：中国石油集团长城钻探工程有限公司解释研究中心;
【基金】：国家科技重大专项(2011ZX05009-004)资助
【分类号】：TE327

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