水下三维激光扫描在导管架平台损伤测量中的应用

Application of 3D Underwater Laser Scanner in Damage Detection of the Jacket Platform

海洋石油导管架结构受损点的尺寸测量目前主要使用机械卡尺测量,这种测量方法存在较大的误差,无法全面评估损伤点对导管架的影响,为此,需要引进新的方法和技术来满足导管架损伤点的测量。为准确评估损伤点对导管架的影响,保证导管架运营的安全,采用水下机器人(ROV)搭载三维激光扫描仪,分别对中国某海域导管架的阳极和已知损伤区域进行激光扫描,通过对激光点云数据的处理,得到被测物的三维模型,从而实现损伤结构的尺寸测量。研究结果表明,激光扫描仪便于ROV搭载和安装,可以应用于导管架已知损伤点的测量,测量精度可达毫米级。激光扫描测量的精度受诸多因素影响,作业时需优化作业方式,从而得到高质量的数据。ROV搭载水下三维激光技术,为深水结构物的尺寸测量提供了一种高精度的可行性方案,可以进行水下结构物的三维建模和尺寸测量,调查结果准确可靠,为后续的完整性评估提供参考。

The size measurement of the damaged point of offshore oil jacket structure currently mainly uses mechanical calipers.This measurement method has large errors and cannot fully evaluate the impact of the damaged point on the jacket.Therefore,it is necessary to introduce new methods and technologies to meet the measurement of damage point of jacket and accurately assess the impact of the damage points on the jacket to ensure the safety of the jacket operations.In a certain sea area of China,an underwater robot(ROV)equipped with underwater laser scanner was used to scan the anode of the jacket and the known damage area.Through the processing of laser point cloud data,a three dimensional model of the measured object was obtained,thereby realizing the size measurement of the structure.The laser scanner was easier to be mounted on ROV and could be applied to the measurement of known damage point of the jacket,and the measurement accuracy could reach the millimeter level.The precision of laser scanning measurement is affected by many factors,so it is necessary to optimize the operation method to obtain high quality data.ROV with underwater laser technology provides a high precision feasibility solution for dimensional measurement of deep water structures.It can be implemented for three dimensional modeling and size measurement of underwater structures.The survey results are accurate and reliable,which will provide a reference for subsequent integrity assessment in the future.