重复调剖效果室内实验研究

The Experimental Study on the Effect of Repeated Profile

针对水驱非均质油藏,利用平行管模型开展重复调剖室内实验研究。对于水驱非均质油藏,注入水主要进入高渗透层,低渗层相对吸水量非常低,造成高渗层见水早,含水增加速度比较快。一次调剖后,原油综合采收率比水驱提高10.67%,综合含水降低13.33%。低、中渗透层吸水量增加,高渗层吸水量降低,但高渗层相对吸水量仍是最多,低渗层最低。随着调剖次数的增加,高渗层相对吸水量逐渐降低,低、中渗层吸水量逐渐增加,但采收率增加及含水率降低幅度逐渐减小,调剖效果逐渐变差。因此,对于非均质地层,调剖次数不宜过多,二次调剖以后应采取调驱等其它措施。

For water flooding in heterogeneous reservoir,the parallel tube model can be used to study repeated profile of indoor experiment.For water flooding in heterogeneous reservoir,water mainly inject into the high permeability layer,and relative water quantity of low permeability layer is very low,so water break through earlier in high permeability reservoir,and the increase of containing water is faster.After one profile control,oil comprehensive recovery increases more 10.67% than water flooding,but comprehensive containing water decreases 13.33%.Low permeability layer and middle permeability layer increase the absorption of water,the water absorption of high permeability layer decrease,but the relative water intake capacity of high permeability layer is still most,low permeability layer least.Along with the increase in the number of profile control,relative water absorption in high permeability layer decrease gradually,the relative water intake capacity of low permeability layer and middle permeability layer gradually increase,but the increase of recovery and the decrease of containing water decrease gradually,then the effect of profile control becomes worse.Therefore,for the heterogeneous reservoir,profile control should not be too much frequency,and after twice profile control,other measures such as the flooding should be taken.