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吉林油田CO2驱油藏物性差,渗透率差异较大,裂缝相对发育,注入CO2过程中出现气窜,严重影响气驱效果。为此开展CO2泡沫体系研究,扩大气驱波及体积,提高气驱开发效果。室内建立了泡沫体系的性能评价手段,优选了一种由阴离子表面活性剂与非离子表面活性剂复配而成的CYL泡沫体系,确定了现场CYL泡沫体系的最佳加量为0.3%、气液比为1∶1。物模试验结果表明:裂缝性低渗透岩心中CO2泡沫驱采收率最高53.67%,CO2气驱采收率次之(35.74%),水驱采收率最低(23.42%)。CO2泡沫驱的效果明显好于水驱、CO2驱,现场开展CO2泡沫驱试验,注气压力由措施前的6.0 MPa上升到措施后的8.1 MPa,井组日产油由措施前的7.7 m3增至措施后的10.8m3,措施效果明显,气驱开发效果有效提高。
The CO2 flooding reservoir in Jilin Oilfield has poor reservoir permeability, large difference in permeability, relatively developed fractures, and gas channeling during CO2 injection, which seriously affects the gas flooding effect. To carry out CO2 foam system for this study, expanding the volume of air swept and improve the development of gas flooding results. Indoor established a foam system performance evaluation means, preferably by a combination of anionic surfactant and non-ionic surfactant CYL foam system, determined the best addition to the field CYL foam system is 0.3%, gas The liquid ratio is 1: 1. The results of model tests show that the recovery rate of CO2 foam flooding in fractured low permeability cores is 53.67%, that of CO2 flooding is 35.74%, and that of water flooding is the lowest (23.42%). CO2 foam flooding was significantly better than that of water flooding and CO2 flooding. The CO2 foam flooding test was conducted on site. The gas injection pressure increased from 6.0 MPa before the measure to 8.1 MPa after the measure. The well group daily output increased from 7.7 m3 before the measure After the measure of 10.8m3, the effect of the measure is obvious, effectively improve the effect of gas drive development.