The undesired stick-slip vibration is the main source of PDC bit failure, such as tooth fracture and tooth loss. Therefore, the study of PDC bit failure base on stick-slip vibration analysis is crucial to prolong the service life of PDC bit and improve ROP (Rate Of Penetration). For this purpose, a piecewise-smooth torsional model with 4-DOF (degree of freedom) of drilling string system improper PDC bit is proposed to simulate non-impact drilling. In this model, both the friction and cutting behaviors of PDC bit are innovatively introduced. The results reveal that PDC bit is easier to fail than other drilling tools due to the severer stick/slip vibration. Moreover, reducing WOB (Weight On Bit) and improving driving torque can be effectively mitigate the stick-slip vibration of PDC bit. Therefore, PDC bit failure can be alleviated by optimizing drilling parameters. In addition, a new 4-DOF torsional model is established to simulate torsional impact drilling and the effect of torsional impact on PDC bit’s stick-slip vibration is analyzed by applying an engineering example. It can be concluded that torsional impact can mitigate stick-slip vibration, prolong the service of PDC bit and improve drilling efficiency, which is consistent with the field experiment results.

Drilling operations are performed to access underground water, oil and gas resources. In this process, a very broad set of interdependencies has been created to achieve a single goal. The term drilling in this study refers to access to hydrocarbon resources at depths of several thousand meters under the ground. The drilling operation is performed by a drilling rig. These include: hoist system, drilling mud rotation system, rotary system, eruption control system and required power supply system. The result of this extensive set of forces is the transfer of the forces produced to the drilling rig to achieve the desired goal.

All the events ahead in this research are a series of events that take place between the ground level drilling tools and the deep ground drilling. The assemblage that forms the ground-level tool to the drill bit is known as the drill string.

The drilling string is selected according to the type of formation, the depth of drilling, and other factors, but any drill field that the operating client chooses includes at least: Drill collar, drill pipe, damper, stabilizers, joint and bit. Generating and transmitting power on the surface of the earth transfers the required energy to the drill through a drill string. This transfer of force sometimes drills a few millimeters below ground level the force required for drilling. Applied to the drill, these two forces advance deeper into the formations.


Modelling and Vibration Analysis of Drill String and Drilling Bit and Effect of Stick/slip Vibration on It Optimal Operation

Division / Sponsors: 
Aerospace, Bioengineering, Applied Mechanics, Design Engineering Division, Advanced Energy Systems, Manufacturing Engineering Division, Noise Control and Acoustics, Nondestructive Evaluation, Diagnosis, and Prognosis (NDPD), Nuclear Engineering Division, Process Industries Division, Fluids Engineering, Heat Transfer, Materials, Microelectromechanical Systems, Safety Engineering and Risk Analysis, Computers & Information in Engineering


Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2020/volume/84478

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