Catalytic Oxidation Experiment of Transition Metal Cobalt Salt in In-situ Combustion for Heavy Oil

doi:10.3969/j.issn.1006-6535.2022.02.020

Abstract

Abstract: On account of the difficulties for the secondary heavy oil ignition in the in-situ combustion of Hongqian Pilot Test Area, Xinjiang, an experimental study on the catalytic oxidation of heavy oil by transition metal salt was conducted to evaluate the effect of transition metal salt in promoting the stable advancement of the front end of heavy oil in-situ combustion. A physical simulation experiment of in-situ combustion was conducted with one-dimensional combustion tube to analyze the effect of cobalt salt on the peak temperature and front edge advance of heavy oil in-situ combustion. A simultaneous thermal analyzer (TG-DTA) was used to measure the oxidation process of heavy oil, establish the kinetic equation of heavy oil catalytic oxidation, and calculate the activation energy and fingertip factor in the three stages (low-temperature oxidation, fuel deposition and high-temperature oxidation) of the heavy oil combustion. The results showed that after the addition of cobalt nitrate, the activation energy of low-temperature oxidation of heavy oil was reduced by 32%, the activation energy at fuel deposition stage was reduced by 31%, the high-temperature oxidation stage was advanced, and the peak temperature of heavy oil combustion was reduced by 50 ℃; the peak temperature difference at the front edge of in-situ combustion was reduced by 90 ℃, realizing the stable advance of the front edge of in-situ combustion. The study results can theoretically and technically support the secondary ignition process of oil recovery by in-situ combustion.

Key words: oil recovery by in-situ combustion, secondary ignition, catalytic oxidation, cobalt nitrate, dynamics simulation

CLC Number:

TE345

Han Xiaoqiang, Li Xiao, Peng Xiaoqiang, Ru Candong, Zhang Jizhou, Shi Hao, Li Zhongquan. Catalytic Oxidation Experiment of Transition Metal Cobalt Salt in In-situ Combustion for Heavy Oil[J]. Special Oil & Gas Reservoirs, 2022, 29(2): 135-140.

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