Contribution à la suppression du phénomène stick slip et à la construction d'un observateur de dimension infinie en forage pétrolier

Abstract : The different types of drilling vibrations play an important role in the malfunctioning of the drilling operations because the lead to the premature rupture of the trains, consequently, to the Loss of the tool at the bottom hole and also damage to the machine. Much of our analysis in this specification relates to the control of the phenomenon of vibration of twisting leading to a controlled rotational speed on the edge. The mathematical aspects and simulation results will be detailed. The modeling of the torsion phenomenon affecting the drill string during was represented by a second order partial differential equation : linear type integrating the phenomenon of friction. Two entries appear in the boundary conditions in terms of the speed of the train and the reaction with the soil. It is therefore a matter of designating the speed which ensures adequate rotation for drilling and which avoid the torsional phenomenon of twist taking into account the interaction of formation with the soil. The dynamic of the drill string stability depends on a system of fluid which should be injected to bring cuttings out of the well bore and amplify the torsional vibrations phenomena. To suppress fracturing collapse or influx of fluids surrounding the well, it is important to integrate the dynamic of the pressure in this study : PDE-ODE control problem. Finally, we are concerned with the problem of boundary observer stabilization for a system of hyperbolic PDEs which describes the drilling systems. The design relies on the top boundary measurements only.
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Samir Toumi. Contribution à la suppression du phénomène stick slip et à la construction d'un observateur de dimension infinie en forage pétrolier. Automatique / Robotique. Université Paris-Saclay; Université de Carthage (Tunisie), 2017. Français. ⟨NNT : 2017SACLE034⟩. ⟨tel-01761475⟩

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