FIELD: well drilling. SUBSTANCE: well tool is used for application of axial load to long body located in wellbore formed in underground formation and has at least one rotating body provided with many shafts capable of radial motion to wall of wellbore with selected contact force between shaft and wall of wellbore. Shafts are oriented after motion to wellbore so that they may roll along spiral path over wall of wellbore. Well tool ensures rotation of each rotary body. Well tool additionally has means for measurement of axial load produced by tool and system for control of the axial load by means of regulation of rotating body torque in response to measured axial load. EFFECT: higher efficiency of well drilling. 1 dwg
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