许多在役油气管道由于自身结构特点、地形环境、敷设情况等条件限制无法实施管道内缺陷检测，致使整个管线系统的安全受到威胁。为了实现管道内缺陷检测，采用非接触式磁力检测技术进行管道全线缺陷检测，运用磁记忆检测技术定性分析和超声波测厚定量分析方法检测开挖管道来验证非接触式磁力检测结果，形成一套针对埋地管道的快速高效的缺陷检测方法体系。工程实践表明，该检测方法能够在埋地管道限制条件和非开挖状态下进行管道缺陷检测，实现腐蚀缺陷管段的精确定位和损伤等级评价，提高检测效率和经济效益。

Defect detection cannot be implemented to many in-service oil and gas pipelines due to the restrictions of structural characteristics of pipelines, terrain environment and laying conditions, resulting in the safety risk of the entire pipeline system. In order to achieve the detection of defects in pipelines, non-contact magnetic detection technology was used to detect defects in the entire pipelines. And then the results tested by no-contact magnetic detection technology were verified by qualitative analysis of magnetic memory detection technology and quantitative analysis of ultrasonic thickness measurement for excavated pipelines. In this way, a fast and efficient defect detection method system for buried pipelines was formed. The engineering practice showed that this detection method can be used to defect detection under restricted conditions and in non-excavation state of buried pipelines, to accurately locate the corrosion defect sections, to identify the damage level and to improve the detection efficiency and economic benefits.