西南石油大学学报(自然科学版)

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Single Factor Analysis of Casing Force Based on the Numerical Simulation

Yu Xianbin1,2*, Chen Xiaoqing1, Ji Youjun3   

  1. 1. Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu,Sichuan 610041,China
    2. University of Chinese Academy of Sciences,Shijingshan,Beijing 100049,China
    3. School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China
  • Online:2015-08-01 Published:2015-08-01

Abstract:

Casing damage is always a problem in the process of oil field development,so it is significance for the study of
casing failure mechanism and its influencing factors to ensure the casing security. Based on fluid-solid coupling theory,a
new mathematical model which was used to simulate the stress distribution of the combination about casing-cement sheath
-formation was established considering seepage and stress interaction during oil development process. Besides,the numerical
simulation was carried out by the finite element software ABAQUS that describes radial compressive force of casing under
different water injection pressure,formation parameters,casing parameters and in-situ stress. The results show that radial
compressive force of casing will increase as the water injection pressure,casing wall thickness and poisson′s ratio and elasticity
modulus of formation increasing. However,radial compressive force of casing will decrease with elastic modulus and diameter
of casing,formation permeability and in-situ stress increasing. The results can provide the theoretical guidance for protecting
and preventing casing damage.

Key words: casing, water injection pressure, single factor analysis, radial compressive force, numerical simulation