摘要
针对红河油田长8超低渗透油藏驱替压力大、注水难以见效的问题，结合纳米材料及表面活性剂两种体系在降压增注和提高采收率方面的优良特性，开展了纳米乳液降压增注技术的研究。以油水界面张力为指标，优选出适合长8油藏的纳米乳液体系中表面活性剂的组成为：阴离子表面活性剂NHBH-1、甜菜碱表面活性剂TCJ-1、非离子表面活性剂X60、低碳醇比例为1：4．25：0-3：0．5。室内评价结果表明，纳米增注体系平均粒径为24．7nm，在0．1％～0．3％浓度范围内与长8原油的界面张力能达到10～mN／m的超低界面张力数量级，能将岩心由亲水性往中性润湿方向改善。驱替实验结果表明，纳米增注体系具有较好的降低注水压力和提高采收率的性能，相比较水驱，注水压力下降18％，采收率提高15％。
According to high pressure and hard injection of water of Chang- 8 ultra low permeability reservoir in Honghe oilfield, and combined with the superiority of nanomaterials and surfactants in decompression, injection stimulation and enhanced recovery, the study of decompression and injection stimulation of nanometer emulsion is conducted. Based on the index of oil and water interfacial tension, the component of surfactant in nanometer emulsion suited for Chang-8 reservoir is selected out, which involves an- ionic surfactant NHBH-1, betaine type amphoterie surfactant TCJ-1, nonionic surfactant X60 and lower alcohol with the proportion of 1：4.25：0.3：0.5. Indoor evaluation results show that, average particle diameter of nanometer augmented injection is 24.7 nm, and in the concentration of 0.1% - 0.3 %, the interfacial tension of Chang-8 reservoir reaches to 10-2 mN/m tension magnitude order, making core changing from water affinity to intermediate wettability. Displacement experiment shows that nanometer augmented injection system has good performance of water injection pressure reduction and recovery improvement, furthermore, compared with water flooding, water injection pressure reduces 18 % and recovery improves 15 %.
出处
《油气藏评价与开发》
CSCD
2016年第6期61-66,共6页
Petroleum Reservoir Evaluation and Development
基金
中国石化科技项目"致密砂岩油藏有效开采关键技术应用研究"(P14076)
关键词
红河油田
超低渗油藏
纳米乳液
降压增注
Honghe oilfield, ultra low permeability reservoir, nanometer emulsion, decompression and injection stimulation
作者简介
周勤（1972-），女，工程师，从事油田化学、采油采气技术研究工作。
