采油油管高速探伤技术的研究

采油油管连接长度约1500～7000m,管壁承压20MPa以上,管子内外壁受油、泥严重污染,各类缺陷多,危害大.超声、涡流等探伤方法不适合;水压法只能检测穿透型缺陷,且速度慢、操作复杂.根据对铁磁性油管施加稳恒磁场和缺陷使通过管壁磁通发生变化,在油管表面产生漏磁场的原理,形成的采油油管高速探伤技术及探伤仪,具有检测油管内外壁裂纹,腐蚀坑点、通孔、抽油杆对内壁磨损槽和壁厚变化等缺陷的功能.其检测速度为15～50m/min;检测灵敏度D1.0mm人工通孔;检测直经50～150mm;操作简单、运行稳定和检测可靠等.

A STUDY ON HIGH SPEED DETECTOR FOR PRODUCTION PIPES

Total length of linked production pipes are about 1500 7000m, side wall pressure is over 20MPa.There are many kinds of polluter such as dirt and sand and flaws on the wall,that is serious danger.Ultrasonic and eddying detector are not appropriate to detect flaw,and high pressure whater detector can only detect a little flaws such as hole but the speed is low,the operation is complex. When a steady and strong enough magneic flux pass along the pipe wall,flaw in wall can change the flux passing through the wall and form leaking magnetic field.According to the principle,the high speed flaw detector of extact oil pipe is designed and produced.It can detect flaws that in or on pipe wall such as craze,hole,hollow,groove and changed wall thickness.Detecting speed is 15 50m/min,ability D1 0 hole,diameter of tube between 50 150mm.The operation is simple,detection is steady and reliable.