关键词: 泡沫调驱, 非均质地层, 渗透率级差, 注入方式

Abstract: The influence of certain parameters on foam flooding in heterogeneous formations was researched using paralleled core experiment.The results show that the lowpermeability 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.

Key words: Foam flooding,     , Anisotropic layer,     , Permeability max-min ratio,   , Injection method