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Optimization of well spacing to achieve a stable combustion during the THAI process

Author

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  • Zhao, Renbao
  • Yu, Shuai
  • Yang, Jie
  • Heng, Minghao
  • Zhang, Chunhui
  • Wu, Yahong
  • Zhang, Jianhua
  • Yue, Xiang-an

Abstract

Toe-to-Heel Air Injection (THAI) is a great potential in improving energy efficiency for heavy oil/bitumen recovery. A 3D cylindrical combustion model with large size is used to carry out several experiments using Xinjiang (China) crude oil. The evolution of the fire chamber, temperature variation rate, and mass of burned carbon were analyzed using temperature measurements and flue gas composition analysis. Coke zone was quantified in the variation of zone thickness and distribution characteristics. The results reveal that there is a prevailing stable propagation of the combustion front during the first one third of the process for varying injector to producer spacing. Oxygen breakthrough is more susceptible for smaller separations and the combustion zone is reduced in length. Larger combustion fronts with greater relative propagation in the horizontal direction occurs when the well spacing is larger. The distribution of coke is significantly influenced by the injector/producer spacing. For a THAI pattern with greater injector/producer spacing, a smaller inclination angle of the coke zone occurs and the likelihood of oxygen breakthrough to the horizontal production well is lessened. Hence, the injector to producer spacing needs to be considered in designing a safe THAI process for potentially larger efficiency and optimum economics.

Suggested Citation

  • Zhao, Renbao & Yu, Shuai & Yang, Jie & Heng, Minghao & Zhang, Chunhui & Wu, Yahong & Zhang, Jianhua & Yue, Xiang-an, 2018. "Optimization of well spacing to achieve a stable combustion during the THAI process," Energy, Elsevier, vol. 151(C), pages 467-477.
    • Handle: RePEc:eee:energy:v:151:y:2018:i:c:p:467-477
    DOI: 10.1016/j.energy.2018.03.044
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    References listed on IDEAS

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    1. Giacchetta, Giancarlo & Leporini, Mariella & Marchetti, Barbara, 2015. "Economic and environmental analysis of a Steam Assisted Gravity Drainage (SAGD) facility for oil recovery from Canadian oil sands," Applied Energy, Elsevier, vol. 142(C), pages 1-9.
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    3. Pang, Zhan-xi & Wu, Zheng-bin & Zhao, Meng, 2017. "A novel method to calculate consumption of non-condensate gas during steam assistant gravity drainage in heavy oil reservoirs," Energy, Elsevier, vol. 130(C), pages 76-85.
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    Cited by:

    1. Yan, Yunfei & Wu, Gange & Huang, Weipeng & Zhang, Li & Li, Lixian & Yang, Zhongqing, 2019. "Numerical comparison study of methane catalytic combustion characteristic between newly proposed opposed counter-flow micro-combustor and the conventional ones," Energy, Elsevier, vol. 170(C), pages 403-410.
    2. Cheng, Linsong & Liu, Hao & Huang, Shijun & Wu, Keliu & Chen, Xiao & Wang, Daigang & Xiong, Hao, 2018. "Environmental and economic benefits of Solvent-Assisted Steam-Gravity Drainage for bitumen through horizontal well: A comprehensive modeling analysis," Energy, Elsevier, vol. 164(C), pages 418-431.

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