ABOUT THE ROTATION OF THE DRILL STRING DURING OPERATION OF A POSITIVE DISPLACEMENT MOTOR WITH A DRILL BIT
Simonyants S.S. – Doctor of Technical Sciences, Professor, Gubkin Russian State University of Oil and Gas (National Research University), firstname.lastname@example.org
All Tai Mustafa – Postgraduate student, Gubkin Russian State University of Oil and Gas (National Research University), email@example.com
Key words: well drilling, downhole screw motor, drill string.
The operation of a positive displacement motor (PDM) during the rotation of the drill pipe (DP) is considered. It is shown that the braking mode of the PDM is especially dangerous during the rotation of the DP. A formula has been obtained for determining the rotational speed of the PDM and the bit, taking into account the rotation of the DP.