Under the Non-Uniform Ground Stress Condition for Simulating the Casing Deformation

Abstract

To the issue about the casing deformation, the paper main study the casing deformation law under the non-uniform ground stress condition, by the ways that the finite element software. The results of the study shows that under the non-uniform ground stress condition, the casing maximum deformation is parallel to the maximum horizontal stress direction. With the increase of the difference between maximum horizontal stress and minimum horizontal stress, the casing deformation increase gradually. And with the elasticity modulus of rock and the Poisson’s ratio of formation increase, the maximum deformation is lessen. The elasticity modulus of rock have more effect than the Poisson’s ratio of formation. When the elasticity modulus of rock exceed a certain threshold, casing deformation would not be effected by the elasticity modulus of rock.
Key words: Non-uniform ground stress; Casing deformation; The elasticity modulus of rock; The Poisson’s ratio of formation