【摘要】 鄂尔多斯盆地油田是典型的低渗透油藏区，存在渗透率、孔隙度低、采收率低等特点，纳米驱油剂进行驱油解决了这类问题。文章在驱油剂的性能分析基础上，对自主开发的GX-S型纳米驱油剂的粒径改变、降低界面张力、改变岩石润湿性、吸附量以及降低毛细管力性能进行了分析评价，重点对其驱油效果进行了研究，结果表明，当矿化度30 000 mg/L、模拟地层温度60℃、驱油剂的质量浓度为0.3 wt%时，可以将界面张力降低至0.113 mN/m、接触角变为109.8°,达到使界面润湿性改变、降低界面张力以及毛细管力的效果；可在水驱油基础上提高采收率11.25%。研究结果对GX-S型纳米驱油剂在油田中进一步推广应用提供可靠的依据。更多还原

【Abstract】 The oil field in Ordos Basin is a typical low-permeability reservoir area, which is characterized by low permeability, low porosity and low recovery, and the nano oil repellents for oil repelling can solve such problems. Based on the performance analysis of oil repellents, the article analyzed and evaluated the performance of the self-developed GX-S nano oil repellents in terms of particle size change, reduction of interfacial tension, change of rock wettability, adsorption and reduction of capillary force, and focused on their oil repelling effects. The results show that when the salinity is 30 000 mg/L, simulated formation temperature is 60 ℃, and the mass concentration of oil repellant is 0.3 wt%, the interfacial tension can be reduced to 0.113 mN/m and the contact angle becomes 109.8°, which achieves the effect of changing the interfacial wettability, reducing the interfacial tension and capillary force; the recovery rate can be increased by 11.25% on the basis of water repellency. The research results provide a reliable basis for further application of GX-S nano oil repellents in oilfield.更多还原