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Author: search.filters.author.Doghmane, Mohamed ZinelabidineSubject: search.filters.subject.Torsional vibrations

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    Sliding mode controller design for torsional vibrations minimization under Rock-Bit interaction effects
    (Springer, 2022) Mendil, Chafiaa; Kidouche, Madjid; Doghmane, Mohamed Zinelabidine
    Torsional vibrations during drilling can have an adverse effect on drilling performance, as they generate Stick-slip phenomena, which reduces the quality of the drilling and the speed of penetration as well. The study of these vibrations can be done through the model of the torsion pendulum (mass-spring), because it is the model that responds to this type of systems. These models consist of several parallel discs, rotating around their common axis and connected to each other. Where, the drill pipes are represented by a torsion spring with a stiffness coefficient and the drill collars with a damping coefficient. The main objective of this study is to reduce the stick-slip vibrations in the drilling system so that the tool can follow the desired nominal angular velocity of the top drive in an optimal time. A simulation of a torsion model with two degrees of freedom has been tested in an open loop, and in order to analyze the severity of the vibrations, two rock-bit contact models with variable weight-on-bit has been studied. Moreover, a sliding mode controller is designed for each Rock-Bit model to achieve the goal of reducing torsional vibrations and to ensure that the Karnoop model global stability is guaranteed. The later implies that the stability is ensured for the other contact models. Furthermore, the obtained results demonstrated the effectiveness the designed controller in reducing the severe vibrations of the stick-slip phenomenon under the different rock-bit interaction effects, and also the robustness of the sliding mode control is verified for each rock-bit interaction
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    Hybrid sliding PID controller for torsional vibrations mitigation in rotary drilling systems
    (Institute of Advanced Engineering and Science, 2021) Mendil, Chafiaa; Kidouche, Madjid; Doghmane, Mohamed Zinelabidine
    During the drilling process, the drilling system devices can be exposed to several types of phenomena incited by lateral, axial, and torsional vibrations. The latter can lead to severe damages if they are not efficiently controlled and quickly mitigated. This research work is focused on the torsional vibrations, which are stimulated by the nonlinear dynamical interaction between the geological rocks and the drill bit. Wherein, a model with three degrees of freedom was designed to demonstrate the severity of the stick-slip phenomenon as consequence of torsional vibrations. The main objective of this study was to design a robust controller based on hybridizing a conventional PID controller with sliding mode approach in order to mitigate rapidly the torsional vibrations. Moreover, a comparative study between PI, PID and sliding mode controllers allowed us to emphasize the effectiveness of the new hybrid controller and improve the drilling system performances. Furthermore, the chattering phenomenon in the sliding surface was overcome by using the saturation function rather than the sign function. The obtained results proved the usefulness of the proposed controller in suppressing the stick-slip phenomenon for smart industrial drilling systems
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    A Study of the Parametric Variations Influences on Stick-Slip Vibrations in Smart Rotary Drilling Systems
    (2020) Mendil, Chafiaa; Kidouche, Madjid; Doghmane, Mohamed Zinelabidine
    During drilling operations, three type of vibrations can appear in the equipment of rotary drilling systems which are axial, torsional and lateral vibrations. Their influences, either simultaneously or separately, prevent the drilling rig from extracting oil and gas from the target reservoirs. Many researcher have indicated that the most damaging hazards in the borehole are those caused by Stick-slip phenomenon, it is the sever status of the torsional vibrations that happened most time along the tool string. It has been shown that one of the main re-generators of this phenomenon is non compatibility of drilling parameters with the type of the geological formations. Therefore, many studies have dedicated to find the appropriate choice of parameters during drilling but few of them have discussed the effect of their variation during the drilling process. The main objective of this study is to analyse the effects of variation of Drill pipes and BHA dimensions and drill mud viscosity on the severity of Stick-Slip vibrations. Moreover, the obtained results have allowed us to set the optimal values of these parameters in order to minimize torsional vibrations without reducing rate of penetration
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    Stick-Slip vibrations control strategy design for smart rotary drilling systems
    (2020) Doghmane, Mohamed Zinelabidine; Bacetti, Abdelmoumen; Kidouche, Madjid
    The objective of this paper is to design new strategy using three controllers for rotary drilling systems located in Algerian oil field. Torsional vibration is one of the most challenges facing petroleum drilling technology, it creates the stick- slip phenomenon that decreases Borehole quality, increases drilling cost through additional operations, and reduces penetration rate. The controllers are designed to minimize the vibrations so that maximize penetration rate and decreases drilling operation costs through avoiding unnecessary operations such as side track. The simulations results were so promising; thus a 3D prototype of rotary drilling systems has been realized in laboratory to validate the proposed approaches. Moreover, a graphical interface has been created to facilitate the use of this strategy by drilling field supervisors
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    Modeling of hydrocarbons rotary drilling systems under torsional vibrations : a survey
    (Springer, 2020) Mendil, Chafiaa; Kidouche, Madjid; Doghmane, Mohamed Zinelabidine
    Modeling of vibrations dynamic during drilling hydrocarbons wells is one of the main challenge facing drillers. Indeed, in order to design controllers that can eliminate or at least minimize such phenomenon, it is mandatory to know with some degrees of certain how the bit faces these vibrations. In literature, there are many models that have been designed to represent the drill string behaviour under torsional vibrations since they are the most harmful ones. It has been proven that stick-slip phase generated by the torsional vibrations is the generator of other types of phenomena (i.e. Bit bounce and whirling). The main objective of this study is to review all the models and compare them in order to set the advantages and drawback of each of them. Moreover, this comparison has allowed us to determine which model to use for designing robust controllers for mitigating the torsional vibrations, thus, diminish all of its effects and the other type of vibrations. The obtained results have supported and demonstrated the conclusive comparative study