纳米SiO2在注水-驱油-油水分离中的界面调控研究进展

Research progress on interface regulation of nano-SiO2 applied in water flooding, EOR, and oil/water separation

表面与界面行为在石油注水开发中广泛存在.功能性纳米二氧化硅具有在油水岩石三相界面吸附/聚集/解吸附的独特效应,有望在经济、高效和绿色环保的石油开发技术中得到应用.本文针对注水、注化学剂驱油及采出液的油水分离三个应用方向,以改变注入液原油岩石三相之间的界面作用为切入点,介绍了纳米二氧化硅的表面功能化及其在调控油/水/岩石三相界面中的研究进展,总结了其界面调控作用机制.最后,结合课题组研究工作,指出了功能性纳米二氧化硅表面结构调控与应用的研究方向.

Surface and interface behaviors are widespread in water flooding stage of oil development.Functional nano-silica is expected to become an economic,efficient and green petroleum development technology duo to its unique effect of adsorption/aggregation/desorption on oil/water/rock three-phase interface.In this paper,we focused on the three application directions as water injection,EOR and oil/water separation,and the changing of interface effect among injection liquid,oil and rock was selected as the breakthrough point.The research statement of decompression and augmented injection by altering wettability from water-wet to oil-wet by hydrophobic nano-silica was summarized.Silica nanoparticles which were used in nanofluids,surfactants,polymers as oil displacement agents were discussed with interface behavior.Moreover,silica nanoparticles applied in oil/water separation were expounded their functional as adsorption and surface structure modification materials.And their interfacial behavior mechanism was also systematically summarized.Finally,combining with our researches,the development tends of adjusting surface structure and macro-preparation of functional nano-silica were prospected.