Preparation of nano-oil-displacing agent with on-site water and its oil displacement mechanism [现场水配制纳米驱油剂及其驱油机理]

作者：Wang X.; Lei Q.^*; Xiao P.; Wang P.; Yang Z.; Han X.; Luo J.; Ye Y.

来源：Acta Petrolei Sinica, 2021, 42(3): 350-357.

DOI：10.7623/syxb202103008

• Enhancing oil recovery
• Enlarging swept volume of water flooding
• Nano flooding
• Network structure of water molecules
• Water flooding

Using 17O nuclear magnetic resonance ( 17O-NMR)technology, this paper studies the feasibility of preparing nano-oil-displacing agent with iNanoW1.0 nano particles and on-site water from the Changqing Jiyuan oilfield. The experimental results show that iNanoW1.0 nano particles can weaken the hydrogen-bonding interaction between on-site water molecules with high salinity. For the on-site water of the Changqing Jiyuan oilfield, the nano-oil-displacing agent with the mass fraction of 0.1% is the optimal working concentration. The low-field nuclear magnetic resonance (LF-NMR)core displacement experiment is used to study the displacement effect of nano-oil-displacing agent on low-ultra-low permeability cores. The experimental results show that the nano-oil-displacing agent prepared with on-site water can effectively reduce the starting pressure of fluid in the low-ultra-low permeability core, especially for the small pore part of the core, swept volume enlargement is obvious, which can realize the enhanced oil recovery (EOR)of 10.29%-11.44%.

• 单位
  中国科学院大学