Abstract

The main cause of deformation is the formation of fluid in the annulus between the casing and tubing. After freezing, this liquid changes from liquid to solid. The pressure then destroys the casing lining and cement sheath. In general, this opinion is correct. However, the studies do not include the propagation of lateral and normal stresses in cement, as well as the effect of the presence (or absence) of adhesion, as well as the effect of these elements on the strength of the entire structure. The above facts and the occurrence of problems in operation became the reason for the study [1]. The main reasons for the formation of the sealing external pressure are the freezing pressure in permafrost and its pressure in the zone of rock flow. As a rule, this pressure is local, therefore it obeys the mechanics of a continuous medium [2].