低频谐振波复合空气泡沫调驱技术实验研究及应用

Experimental Study and Application of Low-frequency Vibration-profile Control by Air Foam

针对延长油田裂缝性特低渗油藏空气泡沫调驱过程中泡沫在地层中的起泡速度慢、半衰期长及起泡剂利用率低的问题,以甘谷驿油藏唐157井区为试验对象,开展了低频谐振波复合空气泡沫调驱的室内实验,研究了低频振动提高采收率的机制。实验结果表明,低频振动作用后岩心的渗透率增大,水驱油见水时间推迟,无水采收期延长,残余油饱和度降低,可以提高采收率3.4%-14.7%。低频谐振波复合空气泡沫调驱技术采收率增幅明显,相比单纯空气泡沫驱增加3.3%-8.0%。现场试验表明,该技术提高采收率效果明显,为延长油田裂缝性特低渗油藏的开发提供了一种新的技术思路和方法。

Based on the target of Tang 57 Well area of Ganguyi reservoir, the indoor experiment on low-frequency vibra- tion-profile control by air foam was conducted for the purposes to solve a series of issues, such as the slow foaming speed of air foam in the profile controlling process of the fractured super low-permeability oil reservoirs of Yangehang Oilfield, the long semi-declining period and the low application efficiency of foam agent. The study was focused on the mechanism for enhanced oil recovery on the basis of low-frequency vibration. The experimental results indicated that the core permeability was improved after low-frequency vibration. The water-cut time of water-flooded oil was delayed while the water-free re- covery period was prolonged. The saturation of residual oil was reduced and the production factor was increased by 3.4 per- cent to 14. 7 percent. The production factor was remarkably improved by means of low-frequency vibration-profile control by air foam. The production factor was increased by 3.3 percent to 8.0 percent as compared to pure air foal flooded stimu- lation. The field experiment indicated that this technology had a remarkable effect on EOR. It provided a new technology and method for development of the fractured super low-permeability oil reservoirs like Yangehang Oilfield.