CURRENT  TECHNOLOGY  OF  COMBINATION  DRILLING  OF  DIRECTIONAL  WELLS  USING  A  DOWNHOLE  DRILLING  MOTOR-DEFLECTOR.

V.V. Prokhorenko – Ph.D. in Engineering, Head of Department
OJSC NPO “Burovaya Tekhnika”

The current technology of directional and horizontal well drilling makes integrated use of benefits provided by different well-path control techniques. The article focuses on the combination drilling method where well path is controlled through interchanging sliding and rotation modes in appropriate wellbore intervals. The  author analyzes the behavior of BHA that includes a drill bit and a deflecting downhole drilling motor bearing centralizers.  It is shown that the diameter and position of the centralizers determine performance of the deflecting BHA  while rotating the drill string.

Key words: downhole drilling motor; turbodrill-deflector; sliding mode; centralizer; bent sub; BHA analytical model.

CURRENT  TECHNOLOGY  OF  COMBINATION  DRILLING  OF  DIRECTIONAL  WELLS  USING  A  DOWNHOLE  DRILLING  MOTOR-DEFLECTOR.

V.V. Prokhorenko – Ph.D. in Engineering, Head of Department
OAO NPO “Burovaya Tekhnika”

The current technology of directional and horizontal well drilling makes integrated use of benefits provided by different well-path control techniques. The article focuses on the combination drilling method where well path is controlled through interchanging sliding and rotation modes in appropriate wellbore intervals. The  author analyzes the behavior of BHA that includes a drill bit and a deflecting downhole drilling motor bearing centralizers.  It is shown that the diameter and position of the centralizers determine performance of the deflecting BHA  while rotating the drill string.

Key words: downhole drilling motor; turbodrill-deflector; sliding mode; centralizer; bent sub; BHA analytical model.