FIELD: well drilling equipment; applicable in drilling vertical and directional wells. SUBSTANCE: guide rod has extension with drill bit and centralizer with flexible supporting strips forming framework. Centralizer has outer diameter Dc determined by relation Dc > Dd+2 mg/g, where Dd is drill bit diameter, m; m is mass of guide rod, kg; g is free fall acceleration, m/s2 f is rigidity of flexible supporting strips, n/m. EFFECT: higher accuracy in wellbore sinking. 1 dwg
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