Experimental study on control function of stabilized platform for rotary steering drilling tool
Weibin Cheng · Acta Petrologica Sinica · 2008
For realizing fully rotary steering drilling in modulated drilling system,there should be a stabilized platform in the rotary steering drilling tool to regulate and maintain the angle of tool surface.A prototype of alignment-navigated stabilized platform was designed on the basis of the dual closed loop cascade systems for controlling angular velocity and position.Algorithm and control pa- rameters for the platform were adjusted by the functional test of both the motor powered gear wheel driving and hydro-power driving with full velocity of water flow.When the generator rotate speed was from 500 r/min to 800 r/min and the rotate speed of lower valve plate was 60 r/min and frictional torque from 0.8 N,m to 7.5 N·m,the system step response time was about three seconds.Reliabil- ity and possibility of the system and control method were experimentally proved.