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Development of the AdjustableAngle Bend Drill Pipe
Zhang Guowei, Su Shanlin, Hao Rongming, Wang Xin
In the processing of downhole accidents especially reservoir head accident, the fish head was not in the middle of the hole, and even attached to the variation of well radius was big. Therefore it was very difficult to implement common fishing method. On the site flexible elbow joints and bending drill pipes were generally to use to look for the fish. It would bend drill pipes many times, then cause waste and even safety accidents. According to this situation, the adjustableangle bend drill pipe was designed. It consisted of top connection, spline body, adjustable sleeve and lowercontact and so on. By adjusting spline body and adjustable sleeve, 0°~4°angle adjustment could be finished. The model machine of the adjustableangle bend drill pipe had been manufactured and applied to many oil wells. The results showed that it was available that the adjustableangle bend drill pipe was applied to fish the fishing head, which was easy to adjust the pipe on wellhead. The application was successful and 300 thousands could be saved per well.
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