ROTARY CLOSED-LOOP STEERABLE DRILLING SYSTEM

Rotary closed-loop drilling technology is one of the hi-techs of today’s drilling industry,and it represents the direction of drilling technology in the future.The typical structures and characteristics of rotary closed-loop drilling systems at home and aboard,together with their integrating methods,downhole directional controlling units,and surface monitoring systems are described.The rotary steerable drilling tools have many advantages,such as continuous 3D steering,extending reach in length,improving drilling speed,shortening completion time,and cutting down drilling cost,etc.A rotary steerable closed-loop drilling system MRSS developed by Steering Drilling Institute is presented,focuses on its direction controlling principle,five parts of compositions,and main technical features.It stresses on the importance of developing and integrating drilling information and planning software.