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致密碳酸盐岩油藏纳米微乳相渗调节作用机制
齐宁1,李振亮1,翟恒来1,梁冲2,李艺恬1,王一伟1,潘林1
(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)
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%。
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
DOI:10.3969/j.issn.1673-5005.2020.01.010
分类号::TE 344
文献标识码:A
基金项目:“十三五”国家科技重大专项(2017ZX005030005)
Relative permeability regulation mechanisms of nano-microemulsion in tight oil and gas reservoirs
QI Ning1, LI Zhenliang1, ZHAI Henglai1, LIANG Chong2, LI Yitian1, WANG Yiwei1, PAN Lin1
(1.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China;2.Langfang Branch of Research Institute of Petroleum Exploration and Development,PetroChina, Langfang 065007, China)
Abstract:
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.
Key words:  nano-SiO2  O/W nano-emulsion  structural characterization  relative permeability  adjustment mechanism
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