基于数字图像技术的钻杆裂纹检测研究

Research for Detecting Surface of Drill Pipe Based on Digital Image Technology

数字图像在石油钻杆无损检测中应用广泛,文中重点介绍荧光磁粉成像法。基于该原理,设计实现了一个表面裂纹无损检测软件,利用钻杆图像颜色较为单一、干扰因素较少以及图像结构稳定的优点,在分析钻杆表面裂纹走向的基础上,主要讨论了图像二值化后裂纹的识别算法和裂纹真伪性的判断。提出了基于顺序扫描法的改进裂纹识别算法,可以有效地进行裂纹识别,以及利用圆形度进行裂纹真伪识别判断,实验结果证明该系统检测效果良好、效率高。

The digital image applies widely in loasless examination of the petroleum drill rod. The fluorescence magnetic powder image method is introduced mainly in this paper. Based on this principle, a surface crack lossless examination software has been designed. Using its merits of relatively unitary imaging color in the drill rod, less influencing factors as well as stable image structure, discussed mainly crack recognition algorithm by imaging binaryzation and crack judgement which is true or false on the basis of analyzing surface crack in the drill rod. Based on the order scanning method, proposed of improving crack recognition algorithm in order to carry on crack recognition effectively as well as crack judgement which is true or false by rotundity. The result shows that it has good effect and high efficiency in the process of examining.