ABSTRACT

Flexible risers are composite cylindrical structures, which are widely used in offshore oil and gas production facilities. Failure of a flexible riser during operation causes major economic and environmental losses. The improvement of structural integrity programs based on nondestructive techniques and risk-based inspections is therefore utterly important. In this article, the feasibility of using the eddy current technique to identify wire rupture of a riser tensile armor is studied. As an important part of the work, an innovative coil prototype (probe) is developed based on the eddy current technique. To assist the construction of the prototype, numerical simulations using the Finite Element Method are applied to reproduce the physical nondestructive test (NDT) and the results are used as support for determining the parameters of the inspection circuit. The resulting signal in all analyses proved the efficacy and viability of Eddy Current Test to inspect the tensile armors of flexible pipes with eventual ruptures.

摘要

柔性立管是复合圆柱结构，广泛应用于海上油气生产设施。柔性立管在运行期间发生故障会导致重大的经济和环境损失。因此，基于无损技术和基于风险的检查改进结构完整性计划非常重要。本文研究了使用涡流技术识别立管拉伸铠装导线断裂的可行性。作为工作的重要组成部分，基于涡流技术开发了一种创新的线圈原型（探针）。为了协助原型的构建，使用有限元方法的数值模拟被应用于再现物理无损检测（NDT），结果被用作确定检查电路参数的支持。所有分析中产生的信号证明了涡流测试在检查最终破裂的柔性管道的拉伸铠装方面的有效性和可行性。