Abstract
This paper investigates the addition of shape memory alloy (SMA) couplers as pipe joints in a drill-string, exploiting the hysteretic behavior related to the superelastic effect. The main idea is to attenuate critical torsional vibrations, especially stick-slip oscillations. A lumped parameter model is used to represent the torsional dynamics of the drill-string, with an imposed angular speed at the top and a nonlinear bit-rock interaction at the bottom. The thermomechanical behavior of the SMA is described using a constitutive model with internal variables. Numerical simulations are carried out comparing responses of the conventional system with the one with SMA couplers. It is shown that the drilling operating map (angular speed at the top vs. weight on bit) has a broader safe operating zone with the couplers. A parametric analysis is carried out establishing the influence of the SMA couplers’ in the drill-string dynamics. The influence of the material properties, the distribution along the drill-pipes, and the SMA coupler length, are investigated. All discussions compare the operating map in each new configuration showing that SMA couplers avoid critical operating conditions.
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