泡沫在不同渗透率级差填砂管中的调驱特性研究

为了解决胜利油田稠油油藏开采时蒸汽波及效率低的问题,利用泡沫作为蒸汽流度调剖剂,在温度为90℃的条件下通过物理模拟实验测算了泡沫在不同渗透率级差的两并联岩心管中的阻力因子、高低渗管中产液速度变化特征及泡沫驱油时的采出程度与注入压差的变化特征。实验结果表明：起泡剂FCY产生的泡沫阻力因子随渗透率级差的增大而先增大后减小;泡沫能使高渗管的产液速度减小,而使低渗管的产液速度增大;并联岩心管饱和油后采用泡沫驱,注入0.85PV泡沫时,才能形成有效封堵,而且渗透率级差越大,最终注入压差越低;泡沫驱能同时提高高渗管和低渗管的原油采出程度,但随着渗透率级差的增大,高渗管采出程度略有增加,而低渗管采出程度略有降低。

Characteristics of foam driving and profile controlling in heterogeneous sand pack tube

In order to solve the problem of low steam sweep efficiency of heavy oil reservoir in Shengli Oilfield, foam is used as profile control agent during steam flooding. The resistance factors in heterogeneous rock （two sand pack tube in parallel having different permeability） saturated with water, the flow rate change with injection time, and the oil recovery factors by foam flooding in these rocks were measured under 90 ~C. The results show that, the foam resistance factor of foaming agent FCY increases with the permeability at the beginning and then decreases. Due to the high flowing resistance in high permeable rock, the flow rate in high permeable rock is greater then that in low permeable rock. In the condition that foam driving oil in this anisotropic rocks, the resistance in high permeable tube increases after total foam injection mount is greater than 0.85 PV, and injection pressure decreases with the permeability ratio increases. The recovery factors of high permeable tube and low permeable tube increase at the same time. But with the permeability ratio increases, the final recovery factors in high permeable tube increase and in low permeable tube decrease slowly.