泡沫驱注入量对不同非均质储层驱油效果的影响

Effect of Foam Injection on Oil Recovery of Different Heterogeneous Reservoir

刘 露 李华斌 郎丽媛 朱 芮 李飞洋

LIU Lu LI Huabin LANG Liyuan ZHU Rui LI Feiyang

揭示空气泡沫驱对储层的适应性，研究了不同非均质变异系数条件下，泡沫注入量对驱油效果及含水率的影响。结果表明：当注入量为0～0.3 PV时，对于任何非均质性的储层，随着注入量的增加，采收率增幅及含水率降幅均增大，且非均质性中等和非均质性强的储层的变化较大；当注入量为0.35～0.5 PV时，注入量的增加对于非均质性弱和非均质性强的储层的采收率增幅和含水率降幅基本无影响，而对于非均质性中等的储层影响较大；当注入量为0.5～0.6 PV时，注入量增加对于任何非均质性储层的采收率增幅和含水率降幅均无影响。非均质性弱、中等和强的储层的最优注入量分别为0.3、0.4和0.35 PV；泡沫驱采收率增幅最大值分别为13%OOIP、23%OOIP和25%OOIP，含水率最大降幅分别为16.7%、29.7%和33.1%。泡沫驱适用于非均质性中等和非均质性强的储层。图4表2参16

In order to reveal the adaptability of air foam flooding to the reservoir, the influence of foam injection on oil displacement and water cut in the conditions of different permeability variation coefficient was studied. The results showed that when the injection rate changed between 0 to 0.3 PV, enhanced oil recovery rate and declined water cut increased with the increase of injection volume for any heterogeneity reservoir, and it had great influence on the change of reservoirs with medium and strong heterogeneity. When the injection rate changed between 0.35 to 0.5 PV, increasing the amount of injection almost had no effect on the enhanced oil recovery rate and declined water cut of reservoirs with weak and strong heterogeneity, while had great effect on that of strong heterogeneity reservoir. The enhanced oil recovery rate and declined water cut of reservoirs with any heterogeneity was poor with the increase of injection rate when the injection rate was between 0.5 to 0.6 PV. At the same time, the best foam injection of reservoir with weak, medium and strong heterogeneity was 0.3, 0.4 and 0.35 PV respectively, the maximum of enhanced oil recovery rate was 13%OOIP, 23%OOIP and 25%OOIP, the maximum of declined water cut was 16.7%, 29.7% and 33.1%. Foam flooding was suitable for the reservoirs with medium and strong heterogeneity.