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真空隔热套管是近年来研制成功的新型油井套管,地面测试结果证明其具有良好的隔热性能。但是,将其应用于稠油热采油井形成的隔热套管井筒是否能够满足稠油热采需要,尚需对其强度状况及井筒隔热情况进行深入研究。该文以稠油热采过程中的实际注蒸汽数据为基础,在井筒传热计算结果基础上,结合真空隔热套管结构及完井井筒结构,利用热弹性力学理论,对真空隔热套管井筒套管的内管、外管强度分别进行了计算、分析,利用内外管在不同井深处的应力计算结果,得出了井深、注蒸汽温度等因素对真空隔热套管井筒安全的影响规律。从而为真空隔热套管的正确使用及进一步完善提供了理论依据,也为实施正确的固井工艺提供了参考。
Vacuum heat-insulated bushing is a new type of oil well casing developed in recent years. The ground test result proves that it has good heat insulation performance. However, it is still necessary to conduct an in-depth study on its strength and wellbore insulation if it is applied to the thermal insulation casing well formed by heavy oil thermal recovery wells. Based on the actual steam injection data in heavy oil thermal recovery process, based on the calculation results of wellbore heat transfer and the combination of vacuum thermal insulation casing structure and wellbore structure, the thermal insulation theory The inner tube and the outer tube of the wellbore casing were calculated and analyzed respectively. Based on the stress calculation results of the inner and outer tubes at different depths, the influence of well depth and steam injection temperature on the safety of the vacuum insulated casing wellbore was obtained law. So as to provide a theoretical basis for the correct use and further improvement of the vacuum insulated bushing, as well as provide a reference for implementing the correct cementing process.