Asphaltene deposition under different injection gases and reservoir conditions

Xiong, Ruiying; Guo, Jixiang; Kiyingi, Wyclif; Luo, Hui; Li, Su

doi:10.1016/j.cherd.2023.03.036

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…At present, the methods for studying the deposition characteristics of asphaltene mainly include the microscopic method, capillary microdeposition simulation, the dynamic light scattering method, and so on [10][11][12][13][14][15][16]. But the microscopy methods are less effective under high-temperature and high-pressure experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Asphaltene Deposition Behavior in Diluted Heavy Oil under High-Pressure Conditions

Yang,

Wu,

Guo

et al. 2023

Energies

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Some oil wells in the Tahe oilfield have been reported to produce extremely heavy oil due to asphaltene deposition. To enhance the flow of crude oil through the wellbore, engineers adopted the use of light oil from nearby wells to dissolve the heavy crude in the wells’ sections to maximize recovery from the Tahe oilfield. However, this mixing has led to the problem of accelerated asphaltene deposition, which often blocks the wellbore in the process. In this research, the factors that influence the stability of diluted heavy oil, temperature, and mixing ratio on asphaltene deposition characteristics under high pressure are studied using a high-temperature and high-pressure crude oil flow property experimental device based on the differential pressure method. The results under high pressure show that the initial deposition pressure of asphaltene decreases as the experimental temperature increases. With an increase in the mixing light oil ratio, the initial deposition pressure of diluted heavy oil increases, and the deposition trend of asphaltene strengthens. The asphaltene accumulation and deposition will be aggravated by filling quartz sand and pipe diameter changes. The research here is helpful to understand the deposition characteristics of asphaltene during the production of diluted heavy oil. It offers significant guidance in the prevention and control of asphaltene precipitation in heavy oil wells.

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