抽油杆是油田机械采油系统的主要受力构件,工作中承受拉-拉交变载荷。现场调查表明,其主要失效形式之一是由于抽油杆表面存在裂纹源,应用双磁芯差动式涡流检测探头能够快速准确地检测抽油杆。介绍了抽油杆专用探头的设计原理及其应用情况。实验表明该探头满足现场使用的要求。 Sucker rod is the main mechanical component of the oil field mechanical components, work under tension - pull alternating load. Field investigations show that one of the main failure modes is the presence of a crack source on the surface of the sucker rod. The use of a dual-core differential eddy current probe enables fast and accurate detection of the sucker rod. The design principle of sucker rod probe and its application are introduced. Experiments show that the probe to meet the requirements of field use.