A new approach of CO_(2)separation by applying rapid expansion of supercritical CO_(2)rich natural gas

The previous methods for CO_(2)separation from CO_(2)rich natural gas led to expensive production costs.This work was implemented to overcome the problems utilizing a new approach economically.The cooling and rapid expansion processes were integrated for the CO_(2)separation from CO_(2)rich natural gas on the supercritical condition.The experimental apparatus was newly constructed to perform the experiments,and the results were simulated using a various equation of state.The result reveals that the inlet temperature of supercritical expansion diminished the outlet temperature and the gas condensed easily.The simulation indicated that the 70%CO_(2)in natural gas was condensed easier than 45%CO_(2).We found that the outlet temperature of
42C and the vapor fraction of 0.69 was attained at the CO_(2)composition of 70%.Besides,the pressure drop change influences the vapor fraction at various CO_(2)compositions.The vapor fraction under supercritical diminished significantly compared with the nonsupercritical condition.The expansion coefficient determined utilizing the equation of state escalates by the enhancement of expansion inlet temperature based on CO_(2)composition in natural gas.The acid gas equation of state was the perfect equation to estimate the expansion coefficient with the absolute average error of 4.83%.This work suggests that the CO_(2)separation from CO_(2)rich natural gas with the cooling and rapid expansion method promotes the new approach to overcome the disadvantages of previous methods.

The effect of type waves on vibroseismic implementation of changes properties of rock, oil viscosity, oil compound composition, and enhanced oil recovery

Based on the results of laboratory studies,the frequency of 35 Hz in longitudinal waves and 20 Hz in circular waves is the optimum frequency that can increase the maximum oil recovery.Coreflooding test results before the vibration effect can increase oil production by 51.96%and reduce the residual oil saturation by 59.03%The surprising results when the vibration effect was applied to the coreflooding test method with P wave types continuously succeeded in increasing oil production by 60.54%,inter-mittent P waves by 63.53%and circular waves by 64.76%,while also reducing Sor by 48.49%in continuous P waves,intermittent P waves at 44.81%and C waves at 43.3%,The P wave type vibrational method has an increase in oil gain by 16%,intemittently by 22%,Sor reduction by 18%and 24%,in circular wave oil gain increases by 25%,and Sor decreases by 27%from before the vibration effect given.Besides vibration can change the physical properties of rocks,among others;permeability has increased by 7%using P waves continuously,intermittently by 31%and C waves by 4%;porosity of 5.88%with P waves contin-uously,intermittently of 6.46%and circular waves of 4.63%;grain size before vibration of 45.16 um after vibration using continuous P waves of 42.01μum,intermittently of 4798μum,and circular of 50.46μum;changes in oil composition to contain more alkanes,and lack of aromatic compounds;oil viscosity increased by 3%with continuous P waves,intermittent of 5%,and circular 61%.The new point from this paper is analyzing the vibroseismic effect by using SEM images in terms of the watershed segmentation of the Rabbani algorithm compared to lab results,which have an error rate of under 2%,and a review of oil composition by the GC-MS method.