Combustion State and Burning Front Prediction During Combustion Assisted Gravity Drainage Process in Horizonal Wells

doi:10.7657/XJPG20200210

Abstract

Abstract:

Accurate prediction of combustion state and burning front in super-heavy oil horizontal wells during combustion assisted gravity drainage process is beneficial to the timely regulation and control of field test. Physical simulation experiments have been carried out with a self-developed 3D physical simulation model for fire flooding. Combining with the production data, the paper calculates the volume of combustion chamber to predict the combustion front in horizontal wells during combustion assisted gravity drainage process, and characterizes the combustion states of oil zone by using parameters such as gas components, temperature and pressure during production. The results show that temperature is a parameter which can directly reflect combustion state; under the steady combustion state there is an angle about 30° between the combustion chamber and the extension direction of the horizontal section in horizontal wells, showing an overlapping combustion feature; coking zone and oil bank form in the upper end of the horizontal well, which can prevent fire from advancing into the horizontal well. In the steady combustion stage during the combustion assisted gravity drainage process, the content of CO₂ in the produced gases is higher than 10%, the content of O₂ is lower than 3%, the temperature of the horizontal section is lower than 300 ℃ and the pressure differential of oil wall is lower than the half of the production pressure differential. Gas channeling will occur during fire flooding when the above conditions can not be reached.

Key words: fire flooding, burning front, physical simulation, combustion chamber, oil bank, pressure differential, gas channeling, coking

CLC Number:

TE357.41

PENG Xiaoqiang, HAN Xiaoqiang, YANG Yang, ZHANG Jizhou, XU Jingrun. Combustion State and Burning Front Prediction During Combustion Assisted Gravity Drainage Process in Horizonal Wells[J]. Xinjiang Petroleum Geology, 2020, 41(2): 199-203.

Figures/Tables 6

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