A in-service oil
drill rob detecting, grading and evaluation method includes the following steps: 1, oil
drill rob detecting preparatory work; 2, measuring the
drill rob inner and outer
joints number; 3, measuring the drill rob
pipe body number; 4, detecting and repairing the drill rob joint thread and the sealing
shoulder surface; 5, measuring the straightness of the drill rob, visual measuring and depopulating the drill rob hydrophthalmos; 6, detecting the inner wall
corrosion from the drill rob inner and outer thread joints to the
pipe body in the 1.2 m scope of the
pipe body centre; 7, detecting the drill rob with ultrasonic; 8, detecting drill rob
electromagnetic induction; 9, detecting the drill rob joints thread
magnetic powder; 10, electromagnetic detecting the abnormal zone and re-detecting the inner wall
corrosion in the scope of 1.2 m of two ends of drill rob with
endoscope; 11, classifying the detection data and marking in different levels; 12, writing the classify statistics and reports. The beneficial effects of the invention are: comprehensive total detecting and classifying evaluating the old in-service oil drill rob, it can effectively avoid the frequent condition of various accidents in the
oil field drilling construction using in-service oil drill rob.