连续油管椭圆度恒磁检测技术及装置研究

针对连续油管储藏、使用和寿命分析对椭圆度检测的要求 ,根据恒磁检测原理和简化等效磁路的计算分析 ,研制了连续油管椭圆度恒磁检测装置。装置由恒磁检测传感器、光电编码器、信号采集处理卡、计算机 (包括信号分析处理软件 )以及显示打印单元等组成。室内静态和动态试验表明 ,装置分析处理软件能够适应一次检测油管 2 0 0 0m ,最大椭圆度检测平均相对误差为 1 2 7%。辽河油田现场试验时检测连续油管 12 0 0m ,表明装置整套软硬件运行正常 ,检测数据稳定 ,有较强的现场适应性和可靠性。

Method and apparatus for constant magnetic inspection of ellipticity of coiled tubing

The study of online inspection of ellipticity of coiled tubing is of great i m portance since the ellipticity is one of the bases for judging the life of the c oiled tubing. On the basis of the criterion of constant magnetic inspection, an apparatus for testing the coiled tubing ellipticity with constant magnetic field is developed. The apparatus is comprised of constant magnetic inspection sensor , photoelectric coder, signal acquisition and processing card, computer and disp lay and printing unit. Static and dynamic tests show that, the apparatus can be used to deal with 2000m coiled tubing once, with a mean relative error of 1 27 % in testing the maximum ellipticity. 1200m coiled tubing was inspected by thi s apparatus in Liaohe Oilfield, and the result shows that stable inspection data were obtained, and this proves the apparatus having high adaptability and relia bility.