DEEP BOREHOLE JACK Russian patent published in 1995 - IPC

FIELD: boreholes sticks removal. SUBSTANCE: to increase efficiency of damage elimination due to creation of thrust force in borehole, that exceeds tolerable starting loading on boring string, jack is provided with nut. Nut is located on load rotor and has longitudinal bulges on outer surface and side holes with cylindrical keys. Load rotor has longitudinal grooves on outer surface. Body is connected with cone by shearing member, is mounted between nut and cone with capability of axial movement, has inner drilling and longitudinal grooves to meet longitudinal bulges of nut. Keys are located in side holes of nut and longitudinal grooves of load rotor with capability of radial movement in case of axial movement of body and location of keys in drilling of body. EFFECT: deep borehole jack is used for boreholes sticks removal. 3 dwg