12-01 16:33:51 In the case of normal tripping, the slope shoulder drill pipe that is lifted while sitting on the elevator will not be subjected to bending loads. The macroscopic characteristics of drill pipe bending indicate that the drill pipe undergoes bending deformation after being subjected to abnormal bending loads. This shows that the elevator bears an abnormal bending load during the lifting process. Only when a single hoist ring trip occurs, the drill pipe at the shoulder of the inclined geological drill pipe slope sitting on the elevator will bear the abnormal bending load. When the bending load of the electric drill
rod exceeds its bearing capacity, the drill rod will undergo bending deformation. The influence of the position of the bending point of the drill pipe, in the case of single lifting ring trip, the drill pipe sitting on the elevator after tilting has two bending fulcrums: one is the lower plane position of the elevator, and the other is the slippery triangular drill The position of the end face of the lever plate. If the bending point of the drill pipe is at the lower plane of the elevator, the distance between the bending point of the drill pipe and the sealing shoulder surface of the female threaded joint should be 630mm. This is inconsistent with the actual distance between the bending point of the drill pipe and the sealing end face of the female threaded joint (860mm), and the difference between the two is 230mm. This shows that the assumption that the bending point of the drill pipe is at the lower plane of the elevator notch drill pipe is not valid. If the bending point of the drill pipe is at the end face of the three slips, the distance between the bending point of the drill pipe and the sealing end surface of the internal thread joint should be the same as the shortest distance between the uppermost impression of the slip and the sealing end face of the internal thread joint of the electric drill pipe. The shortest distance between the actual drill pipe bending point and the uppermost imprint position of the slips and the sealing shoulder surface of the diamond drill bit thread joint in the drill pipe is exactly the same (860mm), and the electric drill pipe bending point is exactly at the uppermost imprint position of the slip. This shows that the hypothesis that the bending point of the drill pipe is located on the end face of the three slip tooth plates is established.
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