Hydraulic micro-rotation safety joint for downhole tubular column
A technology for downhole pipe strings and safety joints, which is applied in the direction of drill pipes, casings, and drilling equipment. The effect of easy operation
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[0028] Such as Figure 1 to Figure 10 As shown, the hydraulic micro-twist safety joint for downhole pipe strings of the present invention includes an upper joint 1 and a lower joint 3, the upper inner cavity of the upper joint 1 is provided with a tapered female thread 1e that is screwed with the upper pipe string, and the lower joint 3 The outer end of the pipe is provided with a tapered male thread 3a which is screwed with the lower pipe string. The central holes of the upper joint 1 and the lower joint 3 are coaxial and communicate with each other. The upper end of the lower joint 3 is provided with a cylinder 2 extending upwards. The inner cavity of the cylinder 2 is equipped with a sliding sleeve that can slide axially along the inner wall of the cylinder 2. 4. The central hole of the sliding sleeve 4 gradually shrinks from top to bottom, and the lower end is provided with a bell-shaped ball seat 4d. The ball seat 4d is equipped with a steel ball 7 that can be closed. The...
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