Development and Analysis of Device Based Flexible Impact for Improving Rate of Penetration
In view of the technical problems such as low mechanical drilling speed and serious drill bit vibration caused by stick-slip phenomenon during oil drilling,a downhole speed acceleration device with a planetary gear and a torsion spring structure is designed.Utilizing the moment of inertia of the input shaft and the upper drilling column system when encountering obstruction,a flexible high-torque impact is given to the drill bit to ensure drilling continuity in encountering hard points while offsetting the torsional vibration caused by the fluctuation of the bit encountering obstruction.By analyzing the dynamics of the planetary gear at the moment of encounter,the influence of different structural parameters on the output torque is obtained.ABAQUS dynamics simulation module is used to verify the effectiveness of the device,and the simulation results shows that the use of the device can effectively mitigate drill vibration.The experimental results of the prototype show that the working principle of the device is feasible and the speed increase is obvious.The drilling speed is increased by 1.5 times when the device is used,and the rock chips returned from the wellhead show uniform and larger particles with polygonal shape,and the cutting process of the drill bit is in a good condition of stable deep cutting.
stick-slip phenomenonacceleration damping devicedrill string vibrationdynamic analysisfinite element simulation
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