Articles

Impact of Water/CO2-Rock Interactions on Formation Physical Properties in EGS

  • BAO Xinhua ,
  • WU Yongdong ,
  • WEI Mingcong ,
  • JIN Xianpeng ,
  • WANG Shuyuan
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  • 1. College of Environment and Resources, Jilin University, Changchun 130021, China;
    2. Daqing Oil-field Limited Liability Company, PetroChina, Daqing 163000, China

Received date: 2013-09-22

  Revised date: 2014-03-24

  Online published: 2014-05-29

Abstract

The enhanced geothermal system (EGS) is an engineering technique that has been created to extract economical amounts of heat from geothermal resources of low permeability and porosity. After the heat-exchange fluid is injected into the deep geothermal reservoir, there will be a water-rock interaction in the fracture channel, causing the dissolution and precipitation of reservoir minerals and changing the physical properties of the fracture channel, influencing long-time running of EGS significantly. This paper concerns a typical granite in Soultz as a geothermal reservoir and builds up a one-dimensional MINC model. Then CO2 and water with identical temperatures and pressures are injected to contrast the effects of injected fluid water/CO2-rock interactions on the fractures in EGS. Results show that the effect of water-rock interaction of CO2-EGS on fracture channel properties is less obvious than that of H2OEGS on the same operation mode.

Cite this article

BAO Xinhua , WU Yongdong , WEI Mingcong , JIN Xianpeng , WANG Shuyuan . Impact of Water/CO2-Rock Interactions on Formation Physical Properties in EGS[J]. Science & Technology Review, 2014 , 32(14) : 42 -47 . DOI: 10.3981/j.issn.1000-7857.2014.14.006

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