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中文摘要：
连续管具有起、下速度快，能实现钻井液连续循环，易于实现钻井自动化和智能化等优点。但由于存在管径小、管壁薄、使用寿命短等问题，有必要对连续管在超深井内工作时的工作安全性进行预估与评测。结合工程实例，用有限元分析方法对现有QT900连续管在超深、高温高压井内生产测试作业进行安全性评价。评价结果表明，现有QT900连续管在超深、高温高压井中测试作业时的工作安全性很低，特别是当连续管内、外压差过大时，可采用向连续管内注入高压液氮等措施使连续管内、外压差趋于平衡，提高连续管作业安全性。
英文摘要：
Coiled tubing （CT） has such strengths as no need of making a connection, achievement of continuous circulation of drilling fluid and achievement of drilling automation and intellectualization. However, due to the problems of small tubing diameter, thin tubing wall and short service life, it is necessary to predict and evaluate the operating safety of CT in superdeep well. Referring to the engineering examples, the finite element analysis method was used to make a safety evaluation of the current QT900 CT production testing operation in superdeep and high temperature and high pressure （HTHP） well. The findings show that there is a low operating safety with the current QT900 CT testing operation in superdeep and HTHP well, especially when the intemal and external pressure differential is extremely large. Then, the measures such as injection of high pressure liquid nitrogen into CT can be taken to balance the internal and external pressure differential, improving the CT operating safety.
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