关键词: 连续管; 无损检测; 缺陷; 椭圆度

Abstract: LXGJ-1 coiled tubing non-destructive testing system can be used for field service at the oilfield and indoor coiled tubing testing at the oil base. It includes two main parts – defect detecting device and ovality detecting device. The testing system can effectively inspect thickness and local defects of coiled tubing according to magnetic leakage detecting principle. It uses the high-precision anti-interference displacement sensor to effectively inspect diameter of coiled tubing. The results from indoor tests and field application indicated that inspection on partial defects and ovality of coil tubing made by this system reached the API RP5C7 requirements. All the functional indexes of the whole system reached the same level of its international counterparts. The successful development and application of this system filled a blank in this technology at home and promoted China’s coiled tubing technological development and application. Non-destructive testing of coiled tubing in service can effectively avoid the hidden faults in service safety caused by failure of coiled tubing, save production cost and provide scientific data for application and management of coiled tubing. The testing system has a broad prospect for application.

Key words: coiled tubing, NDT, defect, ovality