Analysis of Thermal-Mechanical for Casing Damage in Steam Injection Wells

In steam injection wells, the temperature of heat steam is very high and casing is heated during steam injection process, which has become the main reason of casing damage. Therefore, finite element model is very important to analyze the thermal mechanical coupling and casing damage in steam injection wells. Three-dimensional finite element model is investigated; geometry model is constructed with native and parasolid method in ADINA. The casing is modeled by native method and strata are modeled by parasolid method, casing is subtracted and merged with strata by Boolean Operation. Comprehensive loads are defined in structure model, and temperature load in thermal model. In thermal model, all materials are treated as heat conduction material. Thermal-mechanical coupling and casing damage are calculated with finite element model of thermal-mechanical coupling. According to the calculating results, the mechanism of casing damage is analyzed. Finally, some advice is proposed to the protection of casing in steam injection wells.