2-D智能纳米黑卡在低渗透油藏中的驱油性能评价*

Evaluation of Oil Displacement Performance of Two-dimensional Smart Black Nano-card in Low Permeability Reservoir

杨景斌 侯吉瑞 屈 鸣 闻宇晨 梁 拓 吴伟鹏 赵梦丹 杨二龙

YANG Jingbin HOU Jirui QU Ming WEN Yuchen LIANG Tuo WU Weipeng ZHAO Mengdan YANG Erlong

针对低渗透油藏渗透性差、孔喉狭小和岩层致密等特点，研制了片状2-D智能纳米黑卡驱油体系。研究了 2-D智能纳米黑卡的微观结构、润湿性、界面性质、稳定性、乳化降黏性，通过一维岩心驱替实验考察了岩心渗透 率、纳米黑卡浓度以及原油黏度对2-D智能纳米黑卡溶液驱油效果的影响。研究结果表明，纳米黑卡尺寸约为 60 nm×80 nm×1.2 nm，其与油水界面形成“面-面”接触，界面作用极强。纳米黑卡比表面积大，能在水相中均匀 分散，可发挥润湿反转、乳化降黏、降低界面张力、降压增注等多重功效。岩心驱替实验结果表明，岩心渗透率、 纳米黑卡浓度和原油黏度对驱油效果均有影响。在岩心渗透率为25×10-3μm2、纳米黑卡加量为0.005%和原油黏 度为25 mPa·s时，2-D智能纳米黑卡溶液的驱油效果较好，原油采收率增幅为18.10%。片状2-D智能纳米黑卡 可充分发挥“智能找油”功能，适用于低渗透油藏提高驱油效率。图10表2参28

According to the characteristics of low permeability reservoir，such as poor permeability，narrow pore throat and tight rock formation，a flaky two-dimensional（2-D）smart black nano-card oil displacement system was developed. The microstructure， wettability，interfacial property，stability，emulsification and viscosity reduction of 2-D smart black nano-card were studied. The effects of core permeability，nano-black card concentration and crude oil viscosity on the oil displacement effect of 2-D smart black nano-card solution were investigated through one-dimensional core displacement experiments. The results showed that the size of 2-D smart black nano-card was about 60 nm × 80 nm × 1.2 nm. It formed a“surface-surface”contact with oil-water interface，and the interface interaction was very strong. 2-D smart black nano-card had a large specific surface area. It could be uniformly dispersed in the aqueous phase，and exert multiple functions such as wetting reversal，emulsifying and reducing viscosity，reducing interfacial tension，reducing pressure and increasing injection and so on. The experiment results of core displacement showed that core permeability，nano-card concentration and crude oil viscosity had influence on oil displacement effect. When the core permeability was 25 × 10-3 μm2，the amount of nano-card was 0.005% ，and the viscosity of crude oil was 25 mPa·s，the oil displacement effect of 2-D smart black nano-card solution was better，and the enhanced oil recovery rate was 18.10%. The flaky 2-D smart black nano-card could give full play to the function of“intelligent oil exploration”and was suitable for improving oil displacement efficiency in low permeability reservoir.

10.19346/j.cnki.1000-4092.2020.02.021