NIPPLE AND INTERSECTION STABILIZERS Russian patent published in 1996 - IPC

FIELD: construction of wells. SUBSTANCE: nipple stabilizer consists of sub and rotating bushing with ribs which form gap between them. Gap accommodates radial plain bearing which is made of a set of antifriction metal rings alternating with T-shaped adjusting rings of small thickness. In this case, all free hollows are filled with grease or oil. Lower part is connected with inner nut, and bushing is connected with outer nut. Installed between nuts are seals and fluoroplastic end thrust ring. Located also from atop, but between bushing and sub, are seals and plain thrust bearing of wear-resistant material. Besides, rib external surface is coated with fluoroplastic varnishes and compositions. Intersection stabilizer of downhole motor differs from nipple stabilizer only in that it has only one nut simultaneously connected with sub and body of downhole motor. EFFECT: higher efficiency. 2 cl, 3 dwg