Influence of thermal compensation of geothermal reservoir rock formation on CO2 plume geothermal system performance

LI Jingyan1 LIU Zhongliang1 ZHOU Yu1 LI Yanxia1

(1.Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China 100124)

【Abstract】Carbon dioxide plume geothermal system (CPGS) can be used to exploit geothermal energy and realize carbon dioxide geological sequestration simultaneously. The thermal compensation from the rock formation around the geothermal reservoir is one of the important factors that affect the performance of CPGS. Based on a three dimensional base and cap rocks enclosed heat reservoir model, the influences of the thermal compensation on the temperature evolutionary process of the rock and fluid in the geothermal reservoir and the heat collection performance of CPGS were studied. The distribution of geothermal reservoir temperature and the temperature of production fluid were compared with those without consideration of the thermal compensation. The results showed that the thermal compensation reduced both the production fluid temperature variation along the vertical direction and its temperature decreasing rate in the later period of system operation, and therefore extended the lifetime of CPGS and gains better heat collection performance. With consideration of the thermal compensation, the heat production was improved significantly. The results also showed that the thermal compensation of the base rocks was stronger than that of the cap rocks.

【Keywords】 rock formation; geothermal reservoir; thermal compensation; carbon dioxide; geothermal system; porous media; numerical simulation;

【DOI】

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(Translated by LIANG T)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 68, No. 12, Pages 4526-4536

December 2017

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Article Outline

Abstract

  • Introduction
  • 1 Mathematical model
  • 2 Example setting
  • 3 Results and discussion
  • 4 Conclusion
  • References