Structure for connecting inner pipe of drill rod and pup joint of drill rod
A technology of connecting structure and short joints, applied in the direction of drill pipe, drill pipe, casing, etc., can solve the problems of safety accident, easy tripping, vibration, etc., and achieve the effect of avoiding relative rotation, improving work stability and work efficiency
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[0010] The specific embodiments of the present invention will be described below in conjunction with the drawings.
[0011] see figure 1 and figure 2 , The present invention includes an inner tube 1 with an internal thread 11 at one end and a short section 2 with an external thread 21 at one end. The internal tube 1 and the short section 2 are screw-connected through the internal thread 11 and the external thread 21; the short section 2 The root of the external thread 21 has a positioning flange 22. When the sub-section 2 is screwed to the inner tube 1, the positioning flange 22 abuts the end 11 of the inner tube 1 to prevent excessive spiraling between the sub-section 2 and the inner tube 1. It is not convenient to separate the two. In the present invention, the other end of the short section 2 is a connecting portion 23 with an internal thread, and the connecting portion 23 is used for screw connection with another inner tube.
[0012] The above description is an explanation o...
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