Research On Single Turbine Generator Automatic Vertical Drilling Tool

With the continuous exploration and development of oil and gas fields,the formation structure encountered in vertical drilling operations is becoming more and more complex,especially the problem of ’’anti-deviation and fast drilling’’ in high and steep structural formations has become a difficult point in vertical drilling operations.The traditional passive anti-deviation method limits the drilling pressure and drilling speed,and increases the drilling cost.Therefore,this paper designs an automatic vertical drilling tool driven by a generator with two functions of correcting and stabilizing.Based on the working principle of the push-type automatic vertical drilling tool,an automatic vertical drilling tool driven by a single turbine generator is designed in this paper.The turbine generator drive scheme design,stable platform support scheme optimization and structural design of the stable platform are carried out.The friction torque generated by the rotation of the bearing,the viscous friction torque of the drilling fluid on the rotating motion of the electronic warehouse shell,and the friction torque generated by the relative rotation of the disc valve are calculated and the influencing factors are analyzed.A tool control shaft rigid body dynamics model including friction torque and generator electromagnetic torque is established.The effects of drilling fluid pressure difference inside and outside the tool and the aperture of the disc valve flow channel on the friction torque of the disc valve were investigated.The results show that the increase of the drilling fluid pressure difference inside and outside the tool or the aperture of the disc valve flow channel will increase the friction torque of the disc valve,and at the same time,the fluctuation degree of the friction torque of the disc valve becomes stronger.When the drilling fluid pressure difference increases from 4MPa to 10 MPa,the fluctuation degree of the friction torque of the disc valve increases by146.7 %.When the aperture of the disc valve channel increases from 5mm to 6mm,the fluctuation degree of the disc valve friction torque increases by 12.2 %-14.5 %.Through the torque analysis of the tool control shaft,the stiffness analysis of the stable platform is carried out by using Solid Works and ANSYS software,and the strength analysis of the tool control shaft and the upper disc valve is carried out.The analysis results show that the above components meet the stiffness and strength requirements respectively,and the wear of disc valves of different materials under different drilling fluid pressure difference conditions is analyzed.The rigid body dynamics simulation model of the tool control shaft is built when the automatic vertical drilling tool performs the correction and stabilization tasks respectively,and the rigid body dynamics analysis of the tool control shaft is completed.The changes of the angular displacement,angular velocity and angular acceleration of the tool control shaft when the automatic vertical drilling tool performs the corresponding tasks are obtained.Through the above content,the function of the tool’s deviation correction and stability is proved,and the advantages of the single turbine generator automatic vertical drilling tool are explained.