Expansion oil well cement with temperature resistance

The invention discloses an expansion oil well cement with temperature resistance, and relates to the technical field of oil well cement manufacturing of oil and gas well cementing, a certain amount of a polyurethane elastic component is added to oil well cement slurry and is uniformly mixed, by use of the expansion characteristics of the polyurethane elastic component, and oil well cement slurry which can block off cracks and micro annular space gaps and can ensure low permeability of set cement, can be formed at high temperature and under high pressure. The expansion oil well cement with the temperature resistance solves the problem that oil well cement is poor in strain resistant capacity, and can effectively extend the life of oil wells. The expansion oil well cement with the temperature resistance is stable in performance at room temperature and high temperature (150 DEG C), good in rheological property, and controllable in thickening time, and the set cement gas detection permeability is lower than 0.05mD.