The smooth outer wall of the drill pipe reduces the risk of sticking and the difficulty of releasing the pipe. Compared with the conventional drill pipe, it is more suitable for horizontal drilling.
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Under the condition of the same borehole size, the reduced outer diameter of the tool joint increases the clearance between the drill string and the borehole wall, which makes the curvature of the kick off point larger, and can realize short radius and ultra-short radius drilling
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