Based on the Downhole Oscillating Device (DOD) newly developed for purpose of improving drilling efficiency, Computational Fluid Dynamics (CFD) simulation is conducted. The axial vibration force created by the DOD is thoroughly investigated. The simulation is focused on the valve part which generates the fluid pressure pulsations. Fluid flow rate and/or back pressure is applied to the model as boundary conditions. The DOD’s application will also induce the inertia phenomenon of the fluid column above the tool. This phenomenon is also studied based on parametric analysis. Within the simulation results, a dynamic model is developed to further investigate the effect of the oscillating force generated by the DOD on drilling efficiency. Nonlinearities in the bit-rock interaction are taken into account in the model. Simulation results show that application of the DOD in drilling may improve the ROP at least by 5%.

Volume Subject Area:
Dynamics, Vibration and Control
Keywords:
vibration, CFD simulation, fluid inertia, bit-rock interaction
Topics:
Boundary-value problems, Computational fluid dynamics, Drilling, Dynamic analysis, Dynamic models, Excitation, Fluid dynamics, Fluid pressure, Fluids, Inertia (Mechanics), Manufacturing, Pressure, Rocks, Simulation, Simulation results, US Department of Defense, Valves, Vibration
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