热采井口装置热蠕变失效分析

CREEP FAILURE ANALYSIS OF THERMAL RECOVERY WELLHEAD

针对热采井口装置在蒸汽驱和蒸汽吞吐两种工况下的热蠕变失效情况,进行了其材料30CrMo在390℃,四个不同应力下的蠕变试验,对试验结果进行了拟合,获得了复合时间强化模型参数。用短期的试验进行了验证,复合时间强化模型的计算值与试验值之间的误差小于15%。运用Ansys Workbench模拟了热采井口装置主要承压件在恒温恒载工况和断续加载工况下的蠕变失效过程,得到主要承压件在两种工况下的失效时间,对热采井口装置的使用寿命评估具有重要的意义。

In view of the creep failure of the thermal recovery wellhead under the conditions of steam flood and steam stimulation,the creep test of 30CrMo at 390℃and four different stresses was carried out.The test results were fitted and the parameters of the combined time hardening model were obtained.It is verified by short-term experiments that the error between the calculated value of the combined time hardening model and the test value is less than 15%.Using ANSYS Workbench,the creep failure process of the main pressure parts of the thermal recovery wellhead under constant temperature and load condition and intermittent load condition are simulated,and the failure time of the main pressure parts under two conditions is obtained,which is of great significance to the service life evaluation of the thermal recovery wellhead.