两亲性纳米颗粒的制备及提高采收率性能

Preparation and Enhanced Oil Recovery Performance of Amphiphilic Nanoparticle

王 刚 毛鹏程 谭 华 朱佳平 孙 傲

WANG Gang MAO Pengcheng TAN Hua ZHU Jiaping SUN Ao

为满足哈得油田高温高盐储层条件下三次采油技术的要求，采用Pickering乳液模板法，用氨丙基三乙氧基 硅烷和全氟辛酸对SiO2纳米颗粒进行表面改性，制得同时具有亲水氨基和疏水氟碳链的两亲性纳米颗粒。研究 了Na+与Ca2+ 浓度、温度对两亲性纳米颗粒分散液与模拟油间界面张力的影响，考察了纳米颗粒在多孔介质中的 运移规律和提高采收率性能。结果表明，两亲性纳米颗粒具有良好的抗盐耐温性能，Na+与Ca2+ 浓度、温度对两亲 性纳米颗粒界面活性的影响较小。两亲性纳米颗粒分散液与模拟油间的界面张力维持在10-2 mN/m数量级。虽 然两亲性纳米颗粒会吸附在岩心孔隙表面，减缓了两亲性纳米颗粒分散液中一部分颗粒的运移速度，但最终可 通过布朗运动实现脱附并运移出岩心。两亲性纳米颗粒在多孔介质中的最终吸附量小于10%，抗吸附性能优 良。两亲性纳米颗粒在高温高盐条件下具有一定的提高采收率效果。在120 ℃、矿化度为215 g/L的储层条件 下，注入0.5 PV 0.6%两亲性纳米颗粒分散液，可在一次水驱基础上提高采收率10.1百分点。两亲性纳米颗粒结 合了分子表面活性剂和均质颗粒的优点，具有较好的界面活性和稳定性。

In order to meet the requirement of tertiary oil recovery technology under the condition of high temperature and high salt reservoir in Hade oilfield，Pickering emulsion template method was used to modify SiO2 nanoparticle with aminopropyl triethoxysilane and perfluorooctanoic acid，and amphiphilic nanoparticle with hydrophilic amino group and hydrophobic fluorocarbon chain was prepared. The effects of temperature and the concentration of Na+ and Ca2+ on the interfacial tension between amphiphilic nanoparticle dispersion fluid and simulated oil were studied. The migration law of nanoparticle in porous media and the performance of oil recovery were investigated. The results showed that the amphiphilic nanoparticle had good salt tolerance and temperature resistance. The dosage of Na + and Ca2 + and temperature had no significant effect on the interfacial activity of amphiphilic particle，and the interfacial tension between amphiphilic nanoparticle dispersion fluid and simulated oil maintained at the order of 10- 2 mN/m. Although the amphiphilic nanoparticles adsorbed on the pore surface of core，which slowed down the migration rate of some particles in amphiphilic nanoparticle dispersion fluid，desorption and migration of the core could be realized through Brownian motion. The final adsorption capacity of amphiphilic nanoparticle in porous media was less than 10%，showing excellent adsorption resistance. Amphiphilic nanoparticle could improve oil recovery under the condition of high temperature and high salt. Under the condition of 120 ℃ and salinity of 215 g/L，the recovery factor increased by 10.1 percentage points over water injection after 0.5 PV 0.6% amphiphilic nanoparticle dispersion solution was injected. Amphiphilic nanoparticle combined the advantage of molecular surfactant and homogeneous particle，and had good interfacial activity and stability.

10.19346/j.cnki.1000-4092.2021.02.019