改性纳米硅颗粒强化高温泡沫的性能及机理研究

Study on Performance and Mechanism of High-temperature Foam Stabilized by Modified Silicon Nanoparticles

高温环境下常规两相泡沫的泡沫稳定性很差,不能满足高温油藏生产需求。本工作以改性纳米硅颗粒(NP)强化α-烯烃磺酸钠(AOS)的泡沫性能,通过Waring Blender法对NP强化泡沫体系的泡沫性能进行评价,研究了NP稳定AOS泡沫的机理和NP强化泡沫高温下的封堵能力。结果表明,2.0%NP强化的0.5%AOS泡沫具有十分稳定的泡沫性能,高温热老化处理后泡沫性能稳定;其稳泡机理在于NP能在气液界面上形成不可逆吸附,同时NP能与AOS分子发生吸附,有效提高起泡溶液的黏度、表面扩张弹性模量和储能模量,增强液膜强度,延缓泡沫的排液、歧化和聚并;NP强化泡沫在1000 mD和3000 mD渗透率时均具有优秀的封堵性能,其阻力因子远大于AOS泡沫,具有高温调驱应用潜力。

Conventional two-phase foams have poor foam stability under high temperature environments and cannot meet the production requirements of high temperature reservoirs.In this work,modified silicon nanoparticles(NP)were used to strengthen the foam performance of sodiumα-olefin sulfonate.The Waring Blender method was used to evaluate the foam performance of NP strengthened foam,the mechanism of NP enhance foam stability and the sealing ability of foam at high temperature were studied.The results show that the 0.5%AOS foam reinforced with 2.0%NP has very stable foam performance,and the foam performance is stable after high temperature heat aging treatment.Its foam stabilization mechanism is that NP can form irreversible adsorption at gas-liquid interface.Meantime,in the adsorption between NP and AOS molecules,which has a small effect on the surface tension,and effectively increases the viscosity,surface expansion elastic modulus and storage modulus of the AOS solution to delay the drainage,disproportionation and coalescence of foam.The foam has excellent plugging performance at both 1000 mD and 3000 mD permeability,and its resistance factor is much larger than that of AOS foam,which has the potential for high-temperature control and flooding applications.