Study on the Characteristics of Changes in Heavy Oil Components during In-Situ Combustion

doi:10.3969/j.issn.1006-6535.2021.04.013

Abstract

Abstract: In view of the complicated changes in heavy oil components during in-situ combustion, the characteristics of changes in heavy oil components between different zones in the in-situ combustion were studied based on CMG-WinProp module. The results of the study showed that the heavy components were cracked into light components by high-temperature oxidation reaction in the combustion zone; the light components were polymerized and converted into heavy components in the coking zone; the light oil after combustion reaction was mainly accumulated in the oil bank zone. The change of the phase diagram showed that with the progress of in-situ combustion, the reservoir temperature was gradually increased, the gas-liquid area was gradually widened, and the critical point of phase diagram moved to the upper left with the increase of light component content. The study results are of great significance for further understanding the laws of component changes in the thermal recovery of heavy oil.

Key words: in-situ combustion, thermal recovery of heavy oil, component migration, phase change

CLC Number:

TE345

Jiang Haiyan, Li Tianyue, Du Kun, Yuan Shibao, Zhang Yupeng. Study on the Characteristics of Changes in Heavy Oil Components during In-Situ Combustion[J]. Special Oil & Gas Reservoirs, 2021, 28(4): 96-101.

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