DECENTRALIZER OF BOTTOM-HOLE LAYOUT Russian patent published in 1998 - IPC

FIELD: drilling technology in mining industry. SUBSTANCE: this is intended for directed cutting-in of second holes and correction of well hole in rotary drilling. Decentralizer of bottom-hole layout has shaft with adapters and installed between them is movable framework with resilient supporting strips. Made in lower end of framework is end-face tooth created by flight of spiral surface. Lower adapter has mating slot. Mounted above framework is sectional axial sliding support in the form of rings with corrugations on outer end faces of extreme rings. Plane of decentralizer operation which is determined by position of its supporting strips is preset by engaging framework tooth with slot in lower adapter and further turning of framework to required position which is monitored by means of telemetric system arranged in drilling string. Aforesaid engineering solution ensures setting and maintaining of decentralizer operating plane during drilling process and increases service life of equipment. EFFECT: higher efficiency. 2 dwg