FIELD: oil and gas industry.
SUBSTANCE: device includes a nipple, tool joint box with sealing devices, which are adjoined by means of conical thread. Structures of thread in the form of projections of nipple are provided at least with two grooves being the cavities for excess lubrication and/or sludge, which are located along common generatrix of cone surface of the thread, offset relative to each other in circumferential and axial direction and have the depth not exceeding the height of profile of threaded structures. Total length of grooves along the above generatrixes considering the width of thread bottoms does not exceed the length of threaded section of the nipple in the same direction.
EFFECT: increasing strength and stability of the connection and providing the tightness.
3 cl, 6 dwg
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