%0 Journal Article %T 致密碳酸盐岩油藏纳米微乳相渗调节作用机制 %T Relative permeability regulation mechanisms of nano-microemulsion in tight oil and gas reservoirs %A 齐宁,李振亮,翟恒来,梁冲,李艺恬,王一伟,潘林 %A QI,Ning %A LI,Zhenliang %A ZHAI,Henglai %A LIANG,Chong %A LI,Yitian %A WANG,Yiwei %A PAN,Lin %J 中国石油大学学报(英文版) %@ 1673-5005 %V %N 1 %D 2020 %P 89-95 %K 纳米SiO2; O/W纳米乳液; 结构表征; 相对渗透率; 调节机制 %K nano-SiO2; O/W nano-emulsion; structural characterization; relative permeability; adjustment mechanism %X 对致密油藏进行相渗调节,可有效启动基质,改善油水渗流状况。纳米材料由于具有比表面积大、尺寸小等优点,可作为相渗调节剂。以分散纳米SiO2的柴油为油相制备纳米级相渗调节剂,并对其进行性能评价。结果表明:纳米相渗调节剂为粒径中值4.351 nm的O/W型纳米微乳液,可稳定存在3个月;不同质量分数相渗调节剂粒径中值为3~7 nm;油水间界面张力为0.5~5 mN/m,在碳酸盐岩压片上的平均接触角为40°~75°;经纳米相渗调节剂处理后岩石表面均匀平滑,且被纳米吸附膜包覆;经纳米相渗调节剂处理后岩心油相相对渗透率下降幅度小于20%,水相相对渗透率下降幅度大于60%。 %X Application of relative permeability modifiers in tight oil reservoirs can effectively mobilize oil in rock matrix and improve the flow behavior of oil and water. Nano-fluid can be used to improve the oil and water relative permeability due to its large surface area, volume, quantum size effect. In this paper, nano-scale relative permeability modifiers formulated with diesel oil and dispersed nano-SiO2 particles were prepared, and their structure and properties were characterized and evaluated. The experimental results show that the nano-scale percolation agent can be stable for 3 months, which is of an O/W type nano-microemulsion with a particle size of 4.351 nm. The median particle size of different mass fraction relative permeability modifiers ranges from 3 to 7 nm. The interfacial tension of oil and water is between 0.5-5 mN/m, and the average contact angle on carbonate rock tablets is between 40° and 75°. SEM testing shows that the rock surface treated by the nano-scale relative permeability modifiers became uniform and smooth, and it can be coated by nano-adsorbent films. The decrease of oil relative permeability in carbonate core is below 20%, but the decrease of water relative permeability is over 60% after the treatment by the nano-scale relative permeability modifiers. %R 10.3969/j.issn.1673-5005.2020.01.010 %U http://zkjournal.upc.edu.cn/zgsydxxben/ch/reader/view_abstract.aspx %1 JIS Version 3.0.0