Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (2): 108-113.doi: 10.3969/j.issn.1673-8926.2014.02.017

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Research and application of wellbore temperature and pressure distribution models for CO2 injection well

ZHANG Yonggang， LUO Yi， LIU Yuelong， LU Yulin， WEI Kaipeng   

  1. Research Institute of Engineering and Technology， Sinopec North Branch， Zhengzhou 450006， China
  • Online:2014-04-06 Published:2014-04-06

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Abstract:

In order to explain the gas breakthrough phenomenon in CO2 flooding field test and accurately optimize the injection pressure, a mathematical model to describe the temperature and pressure distribution was established based on the analysis of wellbore heat transmission and the theory of heat transfer. The temperature and pressure distribution for CO2 injection well in Honghe Oilfield was studied, meanwhile the gas breakthrough phenomenon in CO2 flooding field test was explained by the model combined with the actual injection parameter. The results show that the wellbore temperature increases with the increasing of well depth, while keeps lower than the formation temperature, and the wellbore pressure increases linearly approximately with the increasing of well depth. The greater injection pressure leads to that the bottomhole pressure exceeds formation fracture pressure, which is the root cause of gas breakthrough. The theoretical calculation agreed well with the field analysis, which shows that the model had an excellent guiding significance to the field test.

Key words: clastic reservoir with low porosity and low permeability, main controlling factors, diagenesis facies, Lower Cretaceous, Tanzhuang Sag

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