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


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Article Info

DATE

2019-03

AUTHORS

Yi-Bo Li, Hao Gao, Wan-Fen Pu, Liang Li, Yafei Chen, Baojun Bai

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. More... »

PAGES

3353-3362

References to SciGraph publications

  • 2016-07. Determination of activation energy as a function of conversion for the oxidation of heavy and light crude oils in relation to in situ combustion in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2013-08. Catalytic effect analysis of metallic additives on light crude oil by TG and DSC tests in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2014-09. Thermal evaluation of heavy crude oil by simultaneous TG-DSC-FTIR: Part 2 in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2004-03. Light crude oil combustion in the presence of limestone matrix in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2010-03. Effect of different clay concentrations on crude oil combustion kinetics by thermogravimetry in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2006-02. Kinetics of crude oil combustion in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2015-11. Thermal characterization and model-free kinetics of biodiesel sample in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2006-05. Effect of clay on crude oil combustion by thermal analysis techniques in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2009-08. Influence of reservoir rock composition on the combustion kinetics of crude oil in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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    http://dx.doi.org/10.1007/s10973-018-7577-0

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    40 schema:description 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.
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