SHOCK-ABSORBER TURBODRILL Russian patent published in 2000 - IPC

FIELD: mining industry, particularly, drilling equipment for drilling of deep wells for oil and gas with use of turbodrills. SUBSTANCE: shock-absorber turbodrill includes spindle, turbine section, piston mechanism. Spindle shaft is fixed in its body for axial motion in thrust bearings through value of 4-25 mm. Spindle half-coupling has freedom for axial motion relative to half-coupling of turbine section shaft due to splines, or square or hexahedral cross-section. Installed between half-coupling and thrust end of half-coupling is spring. Body of turbine section is fastened to piston mechanism rod with help of thrust upper sub. Located under piston inside body mechanism is spring whose lower end thrusts body tension sub. Rod has through hole hydraulically communicated body piston space with internal space of turbine section body. EFFECT: higher drilling efficiency due to reduction to possible minimum of dynamic component of bit axial load. 2 cl, 3 dwg