摘要
在注蒸汽吞吐井的井筒应力模型中引入井筒温度场,利用ANSYS软件对不同约束条件下井筒的应力场进行了计算.结果表明,最大热应力发生在套管内壁,超过了N80套管的弹性屈服极限,最大热膨胀发生在温度过渡区.当套管周围掏空时,热应变远大于材料的弹性极限应变,是诱发热采井套管变形损坏的主要原因.为此提出了相应的套管损坏防治措施,在油田现场采用厚壁合金钢TP120TH套管完井,试验结果验证了防治措施的有效性.
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 NS0 casing, while the maximum thermal expansion occurs in the temperature-transition area. In case that the surroundingarea 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.
出处
《力学与实践》
CSCD
北大核心
2008年第1期66-69,46,共5页
Mechanics in Engineering
关键词
蒸汽吞吐井
套管应力场
数值模拟
套管变形
现场试验
steam-injection well, casing stress field, numerical simulation, casing deformation, field experiment
