基于埃洛石纳米管/二氧化硅纳米复合材料的潜在纳米流体提高石油采收率

Tianhong Zhao, Ying Chen, W. Pu, B. Wei, Yi He, Yiwen Zhang
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引用次数: 5

摘要

纳米流体驱油技术是一种利用纳米材料或纳米复合流体提高采收率的技术。虽然目前已有多种纳米材料作为提高采收率剂,但仍存在毒性大、成本高、驱油效率低等缺陷,制约了纳米材料的进一步应用。考虑到上述问题,有必要寻找另一种廉价、环保、高效置换的纳米材料。本文主要研究了一种天然铝硅酸盐纳米材料高岭土纳米管。高岭土纳米管作为一种新型纳米材料,其提高采收率的效果尚未见报道,尚处于起步阶段。原生高岭土纳米管由于其固有的聚集性缺陷,存在堵塞岩石孔隙通道的风险,这可能是其原因所在。为了延长流体进入低渗透储层小孔隙时的悬浮时间,我们提出了HNTs/SiO2纳米复合材料。实验研究了HNTs/SiO2纳米复合材料对润湿性改变和驱油效率的影响。采用溶胶-凝胶法制备了HNTs/SiO2纳米复合材料,并用x射线衍射(XRD)、透射电镜(TEM)和热重分析(TGA)对其进行了表征。通过测量Zeta电位和动态激光散射,研究了化学改性对悬浮液稳定性的影响。结果表明:纳米纳米流体能显著改变油层的润湿性,使油层的润湿性由油湿型转变为水湿型,提高油层的采收率;HNTs/SiO2的最佳浓度为500 ppm,最高最终采收率为39%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhanced Oil Recovery Using a Potential Nanofluid Based on the Halloysite Nanotube/Silica Nanocomposites
Nanofluid flooding injection technique whereby nanomaterial or nanocomposite fluids for enhanced oil recovery (EOR) have garnered attention. Although a variety of nanomaterials have been used as EOR agents, there are still some defects such as toxicity, high cost and low-efficiency displacement, which restricted the further application of these nanoparticles. Considering these problems mentioned above, it is necessary to search for another nanomaterial which is inexpensive, environmentally friendly and results in high efficiency displacement. In this work, a natural aluminosilicate nanomaterial halloysite nanotubes (HNTs) was focused. As a new kind of nanomaterial, the effectiveness of halloysite nanotubes (HNTs) in enhancing oil recovery has not been reported yet and it is still in its infancy. The use of pristine halloysite nanotube is at risk of blocking the rock pore channel due to the intrinsic drawback of aggregation, which may be the reason. To prolong the suspension time of fluids during seeping into the small pores of low permeable reservoirs, we have proposed the HNTs/SiO2 nanocomposites. The effect of HNTs/SiO2 nanocomposites-based nanofluids on wettability alteration and oil displacement efficiency was experimentally studied. The HNTs/SiO2 nanocomposites have been prepared by sol-gel method and characterized with X-ray (XRD), Transmission Electron Microscopy (TEM) and Thermal Gravimetric Analysis (TGA). The effect of the chemical modification on the suspension stability was investigated by measuring Zeta potential and dynamic laser scattering. Results show that the HNTs/SiO2 nanofluid could significantly change the water wettability from oil-wet to water-wet condition and enhance oil production. The optimal concentration of HNTs/SiO2 was 500 ppm, which corresponded to the highest ultimate oil recovery of 39%.
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