NUMERICAL SIMULATION AND INDUSTRIAL APPLICATION OF THE PRODUCTION CASING STESS INSIDE STEAM-INJECTION WELLS
注蒸汽井套管应力的数值计算与工业应用

The production casing stress inside steam-injection wells is analyzed with a casing temperature field. The commercial software, ANSYS, is used to simulate the casing stress under different conditions, and the results indicate that the highest thermal stress is at the internal wall, exceeding the elastic yield ultimate stress of N80 casing, while the maximum thermal expansion occurs in the temperature-transition area. In case that the surrounding area of casings is emptied, the thermal strain will be much higher than the elastic strain limit, and should be mainly responsible for the deformation failure of casings. Based on the results, some preventive measures for casing deformation are proposed, which are verified through the application of TP120TH casings during the well completion in Liao'he oilfield.