procedure for the assembly of sleeves and beet in particular to oil drilling and apparatus for carrying out the procedure

摘要

Process and device for connecting in a tight manner the end of a pipe presenting a cone thread to a corresponding tubular sleeve and subjected to high torques. The holding forces generated by the clamp chucks create some deformations in the pipe which make a tight screwing more difficult. Further, the speed changes of the massive clamp chucks require slow rhythm of work and drive powers which are not compatible with a rational mounting system. The invention provides for a two-step process, wherein an auxiliary spindle (19, 20) is screwed into the sleeve (14) which will be screwed to the extremity of the pipe (5) by means of said spindle (19, 20). This auxiliary spindle (19, 20) is then removed and the end of the pipe (5) and the sleeve (14) are further tightened one against the other under high torque by two rotating clamp chucks (2, 9). The clamp chucks are disposed in such a manner that they allow eccentric and angle variations to take up the mounting tolerances of the pipe sections (5, 14). The clamp flanges (26) are hydraulically operated and hold the pipe sections (5, 14) substantially around the whole contour thereof. The device is preferably used for the preassembly at the factory of pipes aimed at being engaged in oil-well drillings.