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Journal of Thermal Analysis and Calorimetry

, Volume 135, Issue 6, pp 3353–3362 | Cite as

Study of the catalytic effect of copper oxide on the low-temperature oxidation of Tahe ultra-heavy oil

  • Yi-Bo LiEmail author
  • Hao Gao
  • Wan-Fen PuEmail author
  • Liang Li
  • Yafei Chen
  • Baojun BaiEmail author
Article

Abstract

The heavy metal compounds existing in a reservoir have a significant catalytic effect on the low-temperature oxidation of heavy oil during the in situ combustion (ISC) process. This study focused on the thermal behavior of Tahe ultra-heavy oil and the catalytic effect of copper oxide on low-temperature oxidation to probe into the applicability of the ISC technique. For this purpose, three samples, including Tahe crude oil, oxidized oil and oxidized oil-CuO, were studied by performing thermogravimetry (TG)/derivative thermogravimetry (DTG) and differential scanning calorimetry (DSC) with three different heating rates (5–10 and 15 °C min−1) at temperatures ranging from 30 to 830 °C. The result indicated that more fuel was produced to cause more exothermic heat in the high-temperature oxidation (HTO) zone as the heating rate increased. Kinetic parameter calculation detected that the activation energy of the crude oil was 13.73 kJ mol−1 in the low-temperature oxidation (LTO) stage and 131.72 kJ mol−1 in the HTO stage, respectively. Compared with TG/DSC analysis and the activation energy of the three samples, the activation energy of oxidized oil was reduced obviously in the HTO zone by the crude oil. Additional CuO accelerated fuel deposition in the low-temperature region with no reduction in the activation energy, revealing that CuO has a catalytic effect on Tahe crude oil to cause fuel deposition in LTO. Based on the comprehensive thermal performance and kinetic characterization of the crude oil, 69.61% of the crude oil remained in the final LTO, which can be oxidized as coke to supply sufficient fuel for the HTO stage. This finding indicates that the ISC technique may be feasible for Tahe oilfield development.

Keywords

Ultra-heavy oil TG/DSC Copper oxide Activation energy In situ combustion 

Notes

Acknowledgements

The authors wish to recognize financial support from Open Fund (PLN201720) of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University), the National Natural Science Foundation of China (Grant No: 51704245) and 13th Five-Year Plan (2016ZX05053-013). The suppliers of the oil samples and information are also acknowledged. The valuable comments made by the anonymous reviewers are sincerely appreciated.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationSouthwest Petroleum UniversityChengduChina
  2. 2.Department of Geosciences and Geological and Petroleum EngineeringMissouri University of Science and TechnologyRollaUSA
  3. 3.Research Institute of Petroleum Engineering, Northwest Oilfield CompanySinopecÜrümqiChina

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