چكيده به لاتين
One of the important features of heavy oil tanks is its high viscosity, and that's why it reduces the recovery factor of oil in these tanks. Thermal methods were traditionally used to viscosity reduction in enhanced recovery process (EOR). But this method is not justifiable due to the high cost of steam energy production and also the production of coke in the process steam injection process and environmental problems. The viscosity can be dramatically reduced with the help of nanoparticles, without using heat or using limited and controlled heat. In this study, ZnO / CNT nanocomposites, which have been hydrophilic with surface modification operations, have been used as aqueous-based nanofluids in the enhanced recovery process. The sample tested was heavy oil of Soroush field with a viscosity of 402 centipoise at 80 ° C. The results showed that the viscosity reduction of heavy oil from 402 centipoise at temperatures of 80 ° C to the 93.4 centipoise and 61.2 ° C, is possible only using reference nanoparticles at various concentrations of ZnO and CNT. In the next step, the effect of four parameters of concentration, salinity, pH and mixing intensity were investigated on the heavy oil viscosity to evaluate the performance of the nanocomposite. The amine-surface-modified nanocomposite sample, when distilled water was used for fluidization; and the fatty acid-surface-modified sample when seawater was used for fluidization, have better responses and viscosity decreased to 26.08. The effect of pH on viscosity was negligible, which is a positive feature of this nanocomposite. But the effect of mixing on viscosity is very important so that in the absence of mixing, viscosity reduction was very low and when the mixing intensity was appropriate, the viscosity decreased by an average of 41 centipoise. The main objective of this study is to reduce the heavy oil viscosity using the nanocomposites soluble in aqueous-base fluid without using conventional polar solvents in the petroleum industry such as toluene, xylene, heptane and hexane.
Keywords: enhance oil recovery, nanocomposite, fluidization, ZnO/CNT, viscosity reduction, heavy oil
