A mechanical model for predicting casing creep load in high temperature wells

Casing collapse is a long-standing problem. Current studies mainly focus on the impact of a single element on casing collapse. In real conditions, however, it is often caused by a comprehensive set of elements. In this paper, a new mechanical model is presented to predict external load of casing. The influence of both rock flow and thermal expansion is taken into consideration. In order to get analytical result, the formation temperature distribution is also discussed. The analytical solution of the model indicates that the compound load is bigger than the addition of their individual effects.