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7 results on '"Xiong, Qiyong"'

4. Analysis of Xinjiang asphaltenes using high precision spectroscopy

Author

Kiyingi Wyclif, Jixiang Guo, Pan Jingjun, Weibing Deng, Yuqi Yang, Shiling Zhang, Xiong Qiyong, and Ruiying Xiong

Subjects
Degree of unsaturation, Materials science, General Chemical Engineering, Aryl, Electrospray ionization, Analytical chemistry, Aromaticity, 02 engineering and technology, General Chemistry, 021001 nanoscience & nanotechnology, Mass spectrometry, Fourier transform ion cyclotron resonance, chemistry.chemical_compound, 020401 chemical engineering, chemistry, 0204 chemical engineering, Fourier transform infrared spectroscopy, 0210 nano-technology, Asphaltene
Abstract

Asphaltenes are known for causing flow assurance problems in numerous oil fields. In this study we present a comparative spectroscopic analysis of Xinjiang heavy oil asphaltenes as part of ongoing research for an environmentally friendly and cheap chemical inhibitor. The goal is to predict the internal morphology of these asphaltenes through comparative analysis using high precision spectroscopy. Fourier transform infrared spectroscopy (FTIR), proton-nuclear magnetic resonance (H-NMR) and electrospray ionization Fourier transform ion cyclotron resonance combined with mass spectroscopy were used in this analysis. Several studies have demonstrated the enormous potential of these techniques to characterize hydrocarbons. Here we comparatively apply these techniques to characterize Xinjiang asphaltenes with reference to earlier imaging studies with atomic force and scanning tunneling microscopy to assign a structure to these asphaltenes. Results revealed the nature of the asphaltenes to be polycyclic, aromatic with both heteroatomic and metallic content. Thirteen basic and eleven non-basic/acidic nitrogen compounds fused within the aromatic network were identified. The mass distribution is in the range between 100-800 Da. H-NMR revealed various structural parameters (aromaticity and degree of unsaturation) and together with FTIR various functional groups were identified that include: ethers, sulphides, amides and sulfoxides. The predicted structures are consistent with the "island" and "aryl linked core" models.

Published
2020

7. The phase behavior of CO 2 injection in shale reservoirs with nano-pores.

Author

Wan T, Ding K, Xiong Q, and Guo J

Abstract

The main purpose of this paper is to study the solubility of CO 2 in oil and water phase under high temperature and pressure. Firstly, CO 2 -crude oil PVT experiments were carried out to determine the physical parameters of the reservoir fluid in the study field in order to clarify the interaction mechanism of CO 2 with the crude oil. Secondly, the solubility of CO 2 in the reservoir fluid under different pores and the minimum mixed-phase pressure of the CO 2 -crude oil system were calculated by the improved Peng-Robinson equation of state. In this paper, the effects of nano-pores limitation on CO 2 solubility were studied. The results show that pressure increase is favorable to CO 2 dissolution, the solubility increases with the increase of the oil-water ratio. CO 2 solubility decreases with temperature increase. The greater the mineralization of formation water, the lower the CO 2 solubility. Nanopore confinement causes the phase envelope to contract and the minimum mixed-phase pressure to decrease. When the pore radius is smaller, the restriction of the phase envelope is stronger. In this paper, the minimum mixing pressure of crude oil and carbon dioxide is reduced from 31.25 MPa at 50 nm to 21.25 MPa at 5 nm, thus it is beneficial for enhanced oil recovery (CO 2 -EOR). Nanopore confinement favors CO 2 to enhance shale oil recovery. The results of this study are critical to evaluate the effect of CO 2 sequestration, solubility and phase behavior changes of CO 2 in shale reservoirs with nano-pores., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

Published
2024
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