THE EFFECT OF THE ANISOTROPY DRILLING INDEX ON THE DEVIATION OF THE WELL AXIS FROM THE DESIGN PROFILE

Analytical studies of the interaction of the load on the bottom and the bottom hole assembly of the drill string with the bottom itself and the wall of the well during drilling tilted formations have been carried out. The correlation interrelation among the drilling index of anisotropy, zenith angle, the slope of the seams, geometric characteristics of the well, the bottom hole assembly of the drill string and the axial load on the bit has been proved. Analytical studies of the impact of bottom hole assembly of the drill string containing a centralizer on the bottom itself and the borehole wall have been performed. It has been found that with an increase in the axial load on the bit and the gap between the loaded drill pipes and the borehole wall from the bit to the point of contact, the column with the borehole wall distance decreases, and the centralizer in the bottomhole assembly of the drill string increases this distance, thus increasing bit load without the risk of the zenith angle deviation.