Influence of Geometrical and Physical Parameters of Cement on Loads of Casing and Cement

摘要

A mechanical model of casing, formation and cement is established under the action of the in-situ stress in the cementing section. According to the continuous displacement and radial stress conditions, the calculation formulas of loads applied to casing and cement are developed. The influences of geometrical and physical parameters of cement on loads and stresses of the casing and cement are analyzed. The result shows that the increase of Young's modulus of cement results in that the casing load increases firstly, and then decreases. The bigger Young's modulus of cement, the more load of cement. Along with the increase of Poisson's ratio of cement, cement and casing load become bigger Cement load is greater than the casing one, so it can avoid damaging casing.