Sources and Influencing Factors of Associated Gas in Thermal Recovery of Heavy Oil

doi:10.3969/j.issn.1006-6535.2022.03.009

Abstract

Abstract: In response to unclear sources of associated gas during thermal stimulation by steam injection, laboratory experiments were conducted on crude oil, core and formation water samples from Block Qi 40, Liaohe Oilfield with high-temperature and high-pressure reaction still to explore the generation mechanism and influencing factors of associated gas. The study results showed that, crude oil was the main source of associated gas in thermal recovery and mainly took place in aquathermolysis, and reservoir minerals played a catalytic role in the aquathermolysis; the starting temperature of associated gas production was 150 ℃, and its production increased with the increase of temperature, when the temperature reached 300 ℃, the joint action of aquathermolysis and heavy oil pyrolysis led to a sharp increase of associated gas production; at 250 ℃, the aquathermolysis of crude oil was basically completed after 9 days, after which there was no significant increase in associated gas production. The study is of guiding significance for the full utilization of associated gas in thermal recovery of Liaohe Oilfield by steam injection.

Key words: thermal recovery of heavy oil, associated gas, aquathermolysis, physical simulation, Block Qi 40

CLC Number:

TE345

Wang Guodong. Sources and Influencing Factors of Associated Gas in Thermal Recovery of Heavy Oil[J]. Special Oil & Gas Reservoirs, 2022, 29(3): 64-68.

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