耐温抗盐驱油用纳米分散体系的研制与性能评价*

Development and Performance Evaluation of Nano-dispersion System for Oil Displacement with Temperature Resistance and Salt Tolerance

王凯璐 杨 欢 高 洁 李俊成 原 堃 于小荣 苏高申

WANG Kailu YANG Huan GAO Jie LI Juncheng YUAN Kun YU Xiaorong SU Gaoshen

为了改善聚合物驱油体系在高温高盐油藏中高温断裂、抗盐性和长期稳定性差的问题，研制了一种由油酸 改性纳米SiO2（O-SiO2）和疏水缔合聚合物KAPAM组成的纳米分散体系，评价了纳米分散体系的增黏性、耐温 性、抗盐性、抗剪切性、长期稳定性和驱油效果。结果表明，与单一KAPAM溶液相比，纳米分散体系的三维网格 结构提升了体系的结构稳定性及结构恢复能力，从而提高了体系的各项性能。O-SiO2可使KAPAM溶液黏度增 加，组成为0.15% KAPAM+0.3% O-SiO2的纳米分散体系的黏度最大，增黏率为25.73%。纳米分散体系在90 ℃ 下的黏度保留率为 89.41%；当体系中的 NaCl、CaCl2的质量浓度为 60、7 g/L 时，黏度保留率分别为 72.13%、 65.74%；纳米分散体系在90 ℃下可稳定分散约20 d；在90 ℃、矿化度为3.3×104 mg/L的条件下，向填砂管中注入 0.5 PV纳米分散体系可在水驱基础上提高采收率23.5%，表现出较好的耐温抗盐性、长期稳定性及驱油能力。

In order to improve the problems of high temperature fracture，poor salt resistance and long-term stability of polymer flooding system in high temperature and high salt reservoirs，a new nano-dispersion system composed of oleic acid modified nano-SiO2（O-SiO2）and hydrophobically associating polymer KAPAM was developed. The viscosity，temperature resistance，salt tolerance，shear resistance，long-term stability and oil displacement effect of the nano-dispersion system were evaluated. The results showed that compared with single KAPAM solution，the three-dimensional grid structure of nano-dispersion system increased structural stability and structural resilience of the system，which improved the properties of the system. O-SiO2 could increase the viscosity of KAPAM solution. The viscosity of nano-dispersion system composed of 0.15% KAPAM and 0.3% O-SiO2 was the highest，and the viscosity increasing rate was 25.73%. The viscosity retention of nano-dispersion system at 90 ℃ was 89.41%. When the mass concentration of NaCl and CaCl2 in the system was 60 g/L and 7 g/L，the viscosity retention was 72.13% and 65.74%， respectively. The nano-dispersion system could be stably dispersed for about 20 days at 90 ℃. Under the condition of 90 ℃ and salinity of 3.3×104 mg/L，injecting 0.5 PV nano-dispersion system into sand filling pipe could improve oil recovery by 23.5% on the basis of water flooding，which showed good temperature resistance and salt tolerance，long-term stability and oil displacement ability.

10.19346/j.cnki.1000-4092.2021.04.018