Discussion on Ultrasonic Testing(UT) for Drill Collar

It briefly introduced purpose and classification of drill collar,testing requirements for drill collar in API and petroleum industry standard,as well as the common problems in UT detection.It analyzed effect factors from several aspects,such as couplant,accuracy of calibrating manual hole in UT specimen,selecting K value of UT head,radius of curvature and abrasion of UT head,machining mode of drill collar deep hole,hydrocele or oil in the inside surface of drill collar,scanning direction and speed in testing,and so on.It put forward attentions during UT course.