耐热聚烯烃管内衬修复临界缺陷尺寸研究

Study on Critical Defect Size of HTPO Inner Repaired Pipelines

塔河油田针对含腐蚀穿孔型缺陷管道通常采取内衬修复技术,常用的内衬修复技术包括耐热聚烯烃管(HTPO)内穿插修复技术和承压连续软管修复技术。其中HTPO管体本身不承压,成本较低,而承压软管本身可以承压,成本相对较高,对于如何合理地选择内衬修复材料,现场并没有一个明确的答案。为此,通过将实际工程问题简化为物理模型,进而利用有限元软件建立相关模型,给出了HTPO内衬修复管道的临界缺陷尺寸的计算方法,并通过全尺寸水压爆破试验进行验证。经过验证的有限元模型可以准确地给出塔河油田常用管道在运行压力2.5MPa和4.0 MPa下采用HTPO内衬修复的临界缺陷尺寸,可为现场实际施工提供技术指导。

In Ta He oilfield,inner repairing technique is usually adopted to repair the pipe with corrosion perforated defect,which includes HTPO interpenetration repair technology and continuous pressure hose repair technology. The HTPO pipe can’t sustain pressure while its cost is low,and the continuous pressure hose can sustain pressure while its cost is high. But,there is no clear understanding on how to select inner repair material reasonably on site. To solve this problem,by simplifying the actual engineering problem into a physical model,the finite element software was used to establish the relevant model for calculation,which could give the critical defect size of the HTPO inner repair pipeline and could be verified by full-scale hydraulic test. The verified finite element model could accurately give the critical defect size of the commonly used pipelines in Ta He oilfield,which was repaired by HTPO pipe under the operating pressure of 2.5 MPa and 4.0 MPa,providing technical guidance for the actual field construction on site.