Browsing by Author "Meddah, Sabrina"

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Axial-Torsional Vibrations Interaction Analysis and Decoupling in Drill String Systems
(2024) Meddah, Sabrina; Tadjer, Sid Ahmed; Kidouche, Madjid
Rotary drilling system is an important and crucial electromechanical system used in petroleum industry, it is used to drill holes and extract oil and gas from targeted reservoirs beneath the surface. The rate of penetration (ROP) is one of the quantitative metrics used to assess the performance of the drilling system. However, the appearance of unwanted vibrations generally leads to decrease of this performance and increase the nonproductive time (NPT), in addition to drill string damages and wears. These vibrations are classified according to their propagation direction into three types: Axial, Lateral and Torsional. Many researches have been dedicated to designing robust controller to mitigate such vibrations separately. Nevertheless, vibrations often occur simultaneously, with interactions between them. This interaction can have a direct influence on the robustness of the designed controllers. Thus, in order to design a robust controller that mitigate the most frequent vibrations (Axial and torsional), it is necessary to analyze the interaction between them and decouple them before application of any controller. The main objective of this study is to analyze the interaction between the axial and torsional vibrations in the Two-input two-output (TITO) drill string model and to design appropriate decouplers for the system. Based on the obtained results, we demonstrate a significant interaction between the torsional and axial vibrations, and proved that the introduced decouplers have omitted these interaction terms with a minimum influence on the whole dynamic of drill-string system. Therefore, applying this decoupling process is highly recommended to enhance the robustness of the controller in mitigating axial and torsional vibrations simultaneously.
Interaction analysis and coupled vibrations control in rotary drilling systems
(Universite M'Hamed Bougara Boumerdès : Institut de Génie Eléctrique et Eléctronique, 2025) Meddah, Sabrina; Idir, Abdelhakim(Directeur de thèse)
This work focus on coupled vibration analyses of torsional-axial and torsional-lateral interactions control with a PID classic and an FOPID controller optimized by PSO for rotary drilling systems, oil and gaze field, in different Scenario. Where, the vibrations encountered during drilling operations are strongly coupled, resulting in complex effects on drilling performance. These vibrations can be categorized into three types based on their propagation directions within the drilling systems: axial, lateral, and torsional. While many researchers have individually studied each type of vibration, the robustness of developed controllers depends on considering the coupling effects of the other vibrations that are often overlooked. To ensure the robustness of such controllers, it is imperative to analyze the interaction effects of the control systems, specifically focusing on the torsional-axial and torsional-lateral interactions. The primary objective of this thesis is to investigate the interactions among these three types of vibrations and subsequently propose controllers for the coupled cases based on the interaction analysis results. The proposed contribution of interaction analysis was demonstrated through simulation studies under MATLAB, and FOPID controller was designed then optimized using PSO technique and RN. The deep analyses of obtained results demonstrated improved system controller robustness compared to previous studies
PID Control Design of Strongly Coupled Axial-Torsional Vibrations in Rotary Drilling Systems
(Wydawnictwo SIGMA-NOT, 2024) Meddah, Sabrina; Idir, Abdelhakim; Tadjer, Sid Ahmed; Doghmane, Mohamed Zinelabidine; Kidouche, Madjid
Drilling operations can encounter considerable challenges posed by strong, coupled vibrations that exert a complex influence on rotary drilling system performance. These vibrations are classified into three distinct types based on their propagation direction: axial, lateral, and torsional. Previous research efforts have predominantly focused on examining each vibration type in isolation. However, the effectiveness and resilience of developed controllers are profoundly affected by the often overlooked coupling effects arising from other types of vibrations. In this study, we propose the implementation of a Proportional-Integral-Derivative (PID) controller for the coupled Axial-Torsional vibration system. The research presented herein is dedicated to investigate the performance of the controller under strongly coupled vibrations. To address the dynamic vibrations encountered during drilling, it is imperative to understand the intricate behavior of the drill bit in response to these vibrations before designing controllers to mitigate their impact. Numerous models have been proposed in the existing literature to elucidate the behavior of the drill string under axial-torsional vibrations. The objective of this research is to develop a comprehensive model of the drilling system and investigate the robustness of the PID controller to mitigate the adverse effects of coupled Axial-Torsional vibrations. By effectively analysing the obtained results, this study has contributed to the optimization and improvement of drilling operations under sever coupled vibrations.