¡n this study, it is aimed to compare the efficiency of ultrasonic wave technology on asphaitene flocculati on inhibition of crude oils with different American Petroleum Institute (API) gravities. A set of confocal microscopy test is performed and a series of statistical analysis is done. According to the results of this study, there is an optimum radiation time for both crudes at which the viscosity and the flocculation rate of asphaltenic crude oils reduces to its minimum. This optimum appears at later times of radiation for e.xtra heavy oil. Also, it is shown that the rate of changes in the properties measured in this study is sharper for extra heavy crude oil. It could be concluded that the alternations caused by this technology is more significant for Kouh-e-Mond, which is heavier oil than Sarvak crude oil. Derjaguin-Ladau-Verwey-Overbeek (DLVO) kinetic model was also studied and it was understood that this model cannot be a validate model for radiated samples.
This work concerns with experimentally and analytically investigation of free gravity drainage process in porous media under the influence of ultrasonic wave radiation. Glass beads ranges from 70 to 100 mesh sizes were packed and used in the tests. The working fluids consist of distilled water, kerosene and Doroud and Paidar crude oils as wetting and air as non-wetting phase. The measured oil recovery data along with Hagoort (1984) backward methodology were used to determine and to compare the relative permeability of wetting phases in presence and absence of ultrasonic radiation. In addition the relative permeability of non-wetting phases for both cases were calculated from inverse modeling of provided data. The results showed that wave enhanced the relative permeability of phases, except than for the case of Paidar crude oil, which is asphaltenic and the oil recovery decreased by sonication. The momentum conservation equation, as well as Darcy's and Stokes’ laws were combined and a new model for predicting absolute permeability of porous media radiated by ultrasonic waves is developed. The surprising result of developed model is that the permeability of porous medium is independent to the wave parameters. Investigating the influence of ultrasonic wave radiation on viscosity of the fluids and capillary pressure, showed that the radiation acts in opposition to capillary pressure effect, meaning while there is a period of radiation time at which the oil viscosity is decreasing, and after which it is increasing. Finally, the obtained flow parametrers under the influence of wave radiation applied in conventional model of gravity drainage. Well mached observed between predictions of model modified by this method and measured recovery data confirmed the applicability of flow parameters modification method for predicting the gravity drainage behavior under the influence of ultrasonic wave.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.