Kiani Sajad, Jones Daniel R, Alexander Shirin, Barron Andrew R
Energy Safety Research Institute (ESRI), Swansea University, Bay Campus, Swansea SA1 8EN, UK.
Energy Safety Research Institute (ESRI), Swansea University, Bay Campus, Swansea SA1 8EN, UK.
J Colloid Interface Sci. 2020 Jul 1;571:307-317. doi: 10.1016/j.jcis.2020.03.018. Epub 2020 Mar 6.
The hyperbranched chains on the tail of low surface energy surfactants (LSES) causes lowering of surface free energy and rock wettability alteration, offering significant improvement in oil recovery in asphaltene oil reservoirs.
Oil sweep efficiency was determined by fluid displacement in pure brine and LSES-brine solutions in a microfluidic pattern that was representative of a sandstone cross-section. Interfacial tension (IFT), wettability alteration, Raman and X-ray photoelectron spectroscopy (XPS) were used to measure the changes of asphaltene interactions with oil-aged substrate after surface treating with brine and surfactant-brine solutions.
The hyperbranched LSES yielded a significant increase in the original-oil-in-place (OOIP) recovery (58%) relative to brine flooding (25%), even in the presence of asphaltene. Raman spectra showed the LSES-brine solutions to be capable of causing change to the asphaltene aggregate size after centrifugation treatment.
低表面能表面活性剂（LSES）尾部的超支化链会导致表面自由能降低和岩石润湿性改变，从而显著提高沥青质油藏的原油采收率。
通过在代表砂岩横截面的微流控模式下，在纯盐水和LSES-盐水溶液中进行流体驱替来确定油驱替效率。使用界面张力（IFT）、润湿性改变、拉曼光谱和X射线光电子能谱（XPS）来测量在用盐水和表面活性剂-盐水溶液进行表面处理后，沥青质与油老化基质相互作用的变化。
即使存在沥青质，超支化LSES相对于水驱（25%）仍使原地原油（OOIP）采收率显著提高（58%）。拉曼光谱表明，LSES-盐水溶液在离心处理后能够使沥青质聚集体尺寸发生变化。
