CENTRALIZER Russian patent published in 2004 - IPC

FIELD: equipment for examination of geological exploratory and production wells by geophysical methods, alignment of downhole apparatuses in string of drill pipes. SUBSTANCE: centralizer has body with ribs, supporting members mounted for radial movement and spring. Supporting members come in the form of levers comprising two interconnected links. Upper link of lever is attached to rib of body anchored on axle and movable in radial direction. Lower link of lever is attached to rib of ring mounted uniaxially on body and movable with reference to body in axial direction alone. Ring is spring-loaded relative to nut which also installed on body. Links of levers are hinged to body, ring and one another. Body of centralizer can rest against collar made on axle on one side and its other side can be fixed against axial movement by retaining ring. Connection threads, joints and concentric grooves accommodating sealing rings and securing electric connection and tightness of downhole equipment connected to centralizer can be made on both sides of axle of centralizer. Thrust ring can be placed between nut and spring of centralizer. EFFECT: raised functional reliability of centralizer with increase of accuracy of alignment and adjustment of aligning force across supporting members. 3 cl, 2 dwg