致密碳酸盐岩油藏纳米微乳相渗调节作用机制  

Relative permeability regulation mechanisms of nano-microemulsion in tight oil and gas reservoirs

作　　者：齐宁[1] 李振亮 翟恒来 梁冲[2] 李艺恬 王一伟 潘林 QI Ning;LI Zhenliang;ZHAI Henglai;LIANG Chong;LI Yitian;WANG Yiwei;PAN Lin(School of Petroleum Engineering in China University of Petroleum(East China),Qingdao 266580,China;Langfang Branch of Research Institute of Petroleum Exploration and Development,PetroChina,Langfang 065007,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《中国石油大学学报（自然科学版）》2020年第1期89-95,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：“十三五”国家科技重大专项(2017ZX005030005)。

摘　　要：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%。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.

关 键 词：纳米SIO2 O/W纳米乳液 结构表征 相对渗透率 调节机制 

分 类 号：TE344[石油与天然气工程—油气田开发工程]