FIELD: well drilling.
SUBSTANCE: method for drilling a wellbore with a drilling rig includes rotation of a drill string and a drill bit using a drilling rig drive system, application of the initial weight of the drill string as the axial load on the bit (WOB — weight on bit) of the drilling rig, measuring the properties of the drilling rig to obtain the expected rotation speed of the drilling bit and changing the weight of the drill string as the WOB of the drilling rig so that the corresponding change in the axial load acting in the well on the drill bit, occurred simultaneously with change of expected rotation speed of drilling bit. Change in weight of drill string as WOB drilling rig additionally includes control of target object of control WOB, which is a predetermined signal summed with a signal, obtained from linear combination with delayed measurements of rotation speed and torque of drill string on surface, wherein the delay is the difference between the time of propagation of the torsional and axial component from the surface to the vicinity of the bit.
EFFECT: enabling reduction or attenuation of torsional vibrations of the drill string.
12 cl, 9 dwg
