非均质地层泡沫调驱提高采收率实验

Experimental on Foam Flooding for Enhancing Oil Recovery in Anisotropic Layer

利用并联岩心驱替实验,研究了不同参数对非均质地层泡沫调驱提高采收率效果的影响。结果表明,泡沫调驱过程中采收率增加值主要来自于低渗层,高渗层采收率增加较少;从提高采收率和经济角度考虑,泡沫调驱注入量应在0.3PV～0.5PV;泡沫调驱适用的渗透率级差范围应小于15,当级差为10时,采收率提高幅度最大;随着含水率的提高,采收率提高值呈现先上升后降低的趋势,含水率为80%～90%时注入泡沫提高采收率效果最好。注入泡沫过程中,连续注入的方式要优于段塞注入和气液交替注入。

The influence of certain parameters on foam flooding in heterogeneous formations was researched using paralleled core experiment. The results show that the low permeability formations attribute more to the increment of oil recovery in foam flooding, while the increment of oil recovery of high permeability formations is small; Considering the oil recovery and economic benefit, the injection volume of foam is supposed to be 0.3PV-0.5PV; the permeability max--min ratio should be smaller than 15 in foam flooding, and when the permeability max min ratio was 10, the increase amplitude of oil recovery reaches maximum. The increase amplitude raises first and then declines along with the increase of water cut, when the water cut was 80% - 90%, the oil recovery reaches maximum. The continuous injection exhibits better performance than the slugging injection and the method of alternative injection of gas and liquid between foam injecting.