Abstract：The distributions of casing load with uniform and non-uniform in-situ stresses in creep formations are studied by analytical and numerical methods，respectively. Firstly，taking the casing as the elastic foundation, analytical method is employed to analyze the casing loads with uniform in-situ stresses in the creep formations. Secondly，due to the difficulty of the analytical method in treating non-uniform in-situ stresses，finite element method is used instead. It is found that，under the conditions of both uniform and non-uniform in-situ stresses，the casing load will approach the elastic solution with sufficient time duration. Furthermore，the conclusions from numerical simulation for the non-uniform in-situ stresses are just opposite to the present acknowledged ones. For example，the casing loads are determined not only by the stress difference，but also by the stiffness ratio. These new conclusions are very important for applications and laboratory experiments and need special attentions.
