孤岛中二区非离子/阴离子复配降黏剂体系吸附损耗研究

Adsorption Loss of Nonionic /Anionic Viscosity-reducing Agent System Used in the Zhong-2 section of the Gudao Oilfield

曲彩霞 李美蓉 赵红雨 郝清滟

QU Cai-Xia LI Mei-Rong ZHAO Hong-Yu HAO Qing-Yan

针对表面活性剂在地层的吸附损耗影响降黏剂的驱油效果，本文建立了非离子/阴离子降黏剂体系浓度测定方法并用于测定降黏剂体系的吸附损耗。结果表明：对筛选适用于孤岛中二区的阴离子表面活性剂XJ-1+非离子表面活性剂OP-10复配降黏剂体系，分别采用两相滴定法和硫氰酸钴盐比色法测定XJ-1和OP-10的浓度；复合降黏剂油砂饱和吸附量为16.28 mg/g；在油砂吸附前后，质量分数0.15% XJ-1+0.15% OP-10~ 0.3% XJ-1+0.3% OP-10的降黏剂体系与原油间的界面张力变化不明显，0.3%XJ-1+0.2%OP-10降黏剂体系驱油比单一水驱油提高采收率15.6%。

The adsorption loss of surfactant on the sandstone has an influence on oil displacement efficiency of viscosity-reducing agent. In the paper, the method was established to determinate the concentration of nonionic /anionic viscosity-reducing agent system and was used to measure the adsorption loss. The results indicated that the complex viscosity-reducing system composed of anionic surfactant XJ-1+ nonionic surfactant OP-10 was suitable for the Zhong-2 section of the Gudao oilfield. In the complex system, the concentration of XJ-1 was determined by two-phase titration method, and the concentration of OP-10 was determined by cobalt thiocyanate colorimetry. The adsorption of the complex viscosity-reducing system on the surface of the oily sand reached saturation value of 16.28 mg/g. Interfacial tension between viscosity-reducing agent system, 0.15%XJ-1+0.15%OP-10~ 0.3%XJ-1+0.3%OP-10, with the crude oil before and after adsorption change little, and the oil recovery efficiency of viscosity-reducing agent system was more 15.6% than that of water flooding.