Flow behavior of N2 huff and puff process for enhanced oil recovery in tight oil reservoirs
In the present work, the potential of N2 huff and puff process to enhance the recovery of tight oil reservoir was evaluated. N2 huff and puff experiments were performed in micromodels and cores to investigate the flow behaviors of different cycles. The results showed that, in the first cycle, N2 was dispersed in the oil, forming the foamy oil flow. In the second cycle, the dispersed gas bubbles gradually coalesced into the continuous gas phase. In the third cycle, N2 was produced in the form of continuous gas phase. The results from the coreflood tests showed that, the primary recovery was only 5.32%, while the recoveries for the three N2 huff and puff cycles were 15.1%, 8.53% and 3.22%, respectively.The recovery and the pressure gradient in the first cycle were high. With the increase of huff and puff cycles, and the oil recovery and the pressure gradient rapidly decreased. The oil recovery of N2 huff and puff has been found to increase as the N2 injection pressure and the soaking time increased. These results showed that, the properly designed and controlled N2 huff and puff process can lead to enhanced recovery of tight oil reservoirs.
Application of microfluidic pore models for flow, transport, and reaction in geological porous media: from a single test bed to multifunction real-time analysis tool
Recent advances in microfluidics technology can significantly benefit engineering and science research. Through integration with current optical tools like the optical/confocal microscope, the 3D printing, the soft lithography, and the lithography–etching, microfluidic pore model offers a direct and visual way to study the process of geological related pore-scale transport phenomena. In this paper, recent progress of microfluidic pore model mimicking the geological porous media are discussed, which can apply on many disciplines such as environmental, petroleum engineering and geosciences. The purpose of this review is to highlight the significant features of microfluidic pore model application in geological porous medium pertaining research, as well as to provide engineer/scientist an overview of materials and fabrication methods to manufacture micromodels. Furthermore, the outlook of intensively using micromodel as a multifunction real-time analysis tool is proposed to help the reader to enhance their understanding of pore-scale transport phenomena related to geological porous medium. Also, potential critical issues of micromodels in both research and teaching are discussed. The overall role of this review for microfluidic application is intended to provide benefits to professors, students, and other scientists not only in research but also in teaching fields.
Mechanism of Action of Antibacterial Agents
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