聚硅纳米材料增注效果研究

聚硅纳米材料用于低渗油藏增注是油田开发中的一项前沿技术，本研究分析了聚硅纳米材料的增注机理，室内考察了多批聚硅纳米材料的增注效果，并研究了影响聚硅纳米材料润湿性的主要因素。结果表明，聚硅纳米材料对提高岩心渗透率具有明显效果，首批样品提高水相渗透率达25％-66％；聚硅纳米材料能有效改变岩心的润湿性，使其从亲水变为亲油，从而降低水相流动阻力，起到降压增注作用；聚硅纳米材料适宜注入量为3．0PV，建议现场关井时间大于40h；聚硅纳米材料处理后转注石油磺酸盐表面活性剂，可进一步改善地层渗流能力，其渗透率提高幅度为11％。

Study on Augmented Injection Effect of Nanometer Polysilicon Material

Augmented injection of low permeability reservoir by using nanometer polysilicon materials is an original technology in oil field development. The augmented injection mechanism of nanometer polysilicon materials was analyzed. The augmented injection effects of several batchs of nanometer polysilicon materials were investigated in laboratory. The major factors of influence on wettability of nanometer polysilicon materials were studied also. The results showed that nanometer polysilicon materials increased core obviously and the first batch of specimen increased water phase permeability about 25 % permeability - 66%. The nanometer polysilicon materials changed core wettability effectively and changed core wettability from hydrophilicity to hydrophobicity, the water phase flow resistance was reduced so injection pressure was reduced also and injection effect was increased. The reasonable injection volumn of nanometer polysilicon materials was 3.0 PV and shutin time suggested was longer than 40 h. Injecting petroleum sulfonate surfactant after nanometer polysilicon materials treatment improved strata seepage flow capacity further and the strata permeability was increased about 11%.