METHOD OF WELL DIRECTIONAL DRILLING OF DEFLECTING TOOL WITH GUIDE ROD Russian patent published in 2003 - IPC

FIELD: drilling technique; applicable in drilling of directional and horizontal wells. SUBSTANCE: essence of invention consists in keeping the axis of lower end of guide rod with bit in center of wellbore cross-section during well drilling, and wellbore curving is effected by displacement of upper end of guide rod from well axis to wall of wellbore opposite to direction of curving, and keeping it at said wall by force Fc determined by calculation, and keeping axis of lower end of guide rod with bit in center of wellbore cross-section is accomplished by flexible supporting strips of frame of supporting-centering member of flexible centralizer. Rigidity of supporting strips is determined by calculation. EFFECT: increased accuracy of wellbore orientation. 1 dwg