Browsing by Author "Soleimani, Rasa"

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    Analysis of horizontal well productivity in tight gas formations and its sensitivity to reservoir properties
    (2018-09-07) Soleimani, Rasa; Jahanpeyma, Yaser; Salehian, Mohammad
    Abstract Horizontal wells are frequently used in gas reservoirs to enhance the production performance by increasing the contact surface of the well with the formation. Although some methods have been presented to evaluate vertical well productivity in tight gas reservoirs, the detailed information regarding horizontal wells has not yet been deeply addressed. This study uses a modified backpressure test method based on the isochronal test to determine the correct value of the productivity of horizontal wells in a pressure-dependent viscosity anisotropic tight gas formation. To use the isochronal test calculations in the modified backpressure test, the “process conversion-flowing pressure correction” approach was used to convert the modified backpressure test process into the isochronal test. The comparison between productivity values before and after correction with the simulation results validates that how this method can successfully estimate the productivity in horizontal wells. We perform a sensitivity analysis on the error between the pseudo-pressure before and after correction and show its variation with porosity, permeability, skin, formation thickness, and temperature. This can be helpful to understand the importance of correcting pseudo-pressure under different conditions. Results validate that the proposed method of productivity analysis is needed for horizontal wells and should be applied especially in low permeable and thin (tight gas) formations to acquire the precise value of productivity.
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    Heat Transfer and Hydrodynamics of Miscible/Immiscible Systems in Microchannel Devices
    (2022-09) Soleimani, Rasa; Azaiez, Jalel; Gates, Ian D.; Chen, Zhangxing (John); Zargartalebi, Mohammad
    Electronic devices have been and still are inseparable parts of our lives, such as computers, TVs, air conditioners and gaming consoles. It is expected that in the near future, the heat flux dissipated from integrated circuits and other electronic devices increase significantly. Hence, efficient solutions need to be proposed to prevent the abovementioned problems and provide efficient cooling. Regarding the geometrical design of the cooling system, amongst various methods to improve the rate of heat transfer, the use of microchannel devices has proven to be the most effective way. On the other hand, and especially with the advent of new technologies and the requirement for big-data analysis and parallel computing, high-computational-power-demanding devices such as GPU (Graphical Processing Unit)-based computers require proper coolants with high thermal conductivities. Furthermore, while it has been proven that multiphase flows can lead to better heat transfer enhancement, most studies in the literature on flow in microchannels are on single-phase flows. In this research, and with a focus on the microchannel devices, the heat transfer enhancement and the associated hydrodynamics for both the single-phase/miscible and multiphase/immiscible systems have been studied. This work starts with the effect of the nanoparticles (NPs) on heat transfer enhancement in microchannel devices. The NPs non-homogeneous distribution and their impact on the heat removal and the friction factor has been studied and analyzed. Furthermore, and with focusing on immiscible systems, the heat transfer and hydrodynamics of the non-isothermal immiscible Rayleigh-Taylor instability (RTI), and immiscible slug flow based microchannels have been investigated in two sub-sections. In the first sub-section, it has been shown that thermocapillary effect can have a significant effect on the evolution of the instability, and results in its suppression. In the second sub-section, the results show that the immiscible slug flow-based systems systematically have higher heat removal performance compared to the similar single-phase/miscible systems. The effect of a modified flow configuration, namely the alternating slug injection on heat transfer enhancement has been studied and analyzed in this sub-section.