Abstract:

In high-temperature(HT)-high-pressure(HP) gas wells and steam injection wells,the heat stress caused by temperature difference had great effect on contact pressure of casing joints.The distribution of the contact pressure became non-unifonn with the HT difference，the effective stress in casing joints was about equal to its yield strength，and the joints produced the plastic deformation. As a result, sealing ability of casing joints should be paid another attention. The mechanical model was set up for casing joints with the elastic-plastic finite element method.The influence of the temperature to casing joints was analyzed because of change of temperature, which will provide a quantitative basis for safe using of casing joints in HT wells

Key words: temperature, casing joint, contact pressure, finite element analysis