Discussion of Six Eastern Mudstone Formation Casing Factors

The casing-cement annulus-formation mechanical model under the inhomogeneous stress modeled,by using the ANSYS software,the process of the casing deformation and destruction was simulated.Discussion on the failure degree of all the factors on the casing was made.The results showed that:1) inhomogeneous stress is the main factor that cause the casing damage;2) The resistance of the inhomogeneous stress on the casing cement annulus increase with the increment of the elastic modulus of the cement annulus;3) As the increment of the thickness of the cement annulus,the resistance of the inhomogenous stress of the casing cement annulus will increase,we advance new ways that predict and retard the casing damage in the oilfield.