«Onshore and offshore oil and gas well construction»

Improvement of rotary methods of oil and gas well drilling

UDC: 622.24
DOI: -

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: motorized rotary drilling, rotary steerable system, screw downhole motor, mechanical rate of penetration

Annotation:

Nowadays an innovative technology for drilling directional wells that is based on using a relatively short screw motor with a curved sub with a small tilt angle has become widespread. During drilling of a vertical or inclined-straight interval of zenith angle stabilization, the drilling assembly slowly rotates or periodically turns using a rotor or a top power drive (TPD). If it is necessary to change the well inclination angle, the rotation of the assembly is stopped, thepulse duration modulation (PDM) motoris set in the desired azimuthal direction, and drilling goes on with a non-rotating drill string until the required zenith angle is reached. The "rotation-sliding" technology allows for almost precise drilling of all sections of a directional well in accordance with the design profile without lifting the hydraulic drilling motor (HDM) and bit to the surface, providing a significant increase of drilling technical and economic indicators due to the time reduction of tripping operations. The improvement of the "rotation-sliding" technology using rotary steerable systems with a screw downhole motor is considered. The conditions for the cost-effective use of a motorized rotary system are shown in comparison with the use of a screw downhole motor during drilling.

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