Abstract
The purpose of this work is the experimental investigation and the mathematical modeling of the impact force behavior in a vibro-impact system, where an impact pendulum is mounted on a cart that moves with a prescribed displacement. The dynamics of the system will be evaluated considering different excitation frequencies and changing the impact gap. Experimental data are used to validate the mathematical model. The mathematical model allows a detailed nonlinear analysis, showing the rich response of the system, which includes dynamical jumps, bifurcations and chaos. In impact systems, discrepancies between numerical results and experimental measurements are common due to the difficulty in describing all factors that influence the resulting impact force profile. The use of wires to suspend the impacting body has the purpose to limit these uncertainties.
Highlights
Oil well drilling in hard rock formations is still a great challenge for oil companies
The results using an elastic supported hammer presented an interesting amount of different nonlinearities (Aguiar et al [28]), but included discrepancies in the validation due to hammer dynamics
The purpose of this work is the experimental investigation and the mathematical modeling of the impact force behavior in a vibro-impact system, where an impact pendulum is mounted on a cart that moves with a prescribed displacement
Summary
Oil well drilling in hard rock formations is still a great challenge for oil companies. The motivation of this work is to use the already existent vibrations in the drillstring [2,4], to generate an harmonic load on the bit and an excitation in a steel mass (hammer) which will cause impacts, see Fig. 1. The concept of this hybrid drilling technique is to reinsert the energy wasted on axial vibration, back into the drilling process, with the use of impacts. The idea of combinining a percussive action to rotary drilling is not new, being first developed by Hausser and Nusse & Grafer in 1955, as referenced in the works of Batako et al [5]
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