Development of an Innovative Model-Based Stick/Slip Control System

Rudat, Jens; Dashevskiy, Dmitriy

doi:10.2118/139996-ms

Cited by 38 publications

(7 citation statements)

References 19 publications

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“…Rudat and Dashevskiy 13 modeled the drillstring as a mechanical oscillator with rotational SDOF (Figure 2). The model was used to determine optimal parameters by predicting the intensity of downhole stick–slip vibration.…”

Section: Stick–slip Vibration With Uncoupled Modelsmentioning

confidence: 99%

Stick–slip vibrations in oil well drillstring: A review

Tang

Guo

Zhu

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

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A survey of the literature related to theoretical and experimental studies on stick-slip vibration in oilwell drillstring is carried out in this study. It aims to explain key concepts and present the existing methods for studying this phenomenon. After briefly describing the stick-slip vibration related problems, theoretical models for such phenomenon are discussed including both coupled and uncoupled models. Discussion for experimental investigations including both laboratory and field tests are hereinafter addressed. This study aims to summarize the literature related to the stick-slip vibration, and help researchers in understanding and suppressing such phenomenon.

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Section: Stick–slip Vibration With Uncoupled Modelsmentioning

confidence: 99%

Stick–slip vibrations in oil well drillstring: A review

Tang

Guo

Zhu

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

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“…6 describes how the resistive torque at the drill bit is modelled based on the friction law presented in [7,8].…”

Section: Friction Torque Modellingmentioning

confidence: 99%

Numerical Application of a Stick-Slip Control and Experimental Analysis using a Test Rig

2018

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Abstract. Part of the process of exploration and development of an oil field consists of the drilling operations for oil and gas wells. Particularly for deep water and ultra deep water wells, the operation requires the control of a very flexible structure which is subjected to complex boundary conditions such as the nonlinear interactions between drill bit and rock formation and between the drill string and borehole wall. Concerning this complexity, the stick-slip phenomenon is a major component related to the torsional vibration and it can excite both axial and lateral vibrations. With these intentions, this paper has the main goal of confronting the torsional vibration problem over a test rig numerical model using a real-time conventional controller. The system contains two discs in which dry friction torques are applied. Therefore, the dynamical behaviour were analysed with and without controlling strategies. General Introduction Oilwell drilling and test-rig model overviewThe actual organizational model of oil and gas industry is no longer sustainable with oil prices below $50 a barrel. Christopher et al. (2016) [1] describes what they call the "potentially game-changing disruptions that may lead oil and gas companies to rethink their operating models fundamentally". Then, to address the industry challenges, this paper focuses its efforts on modelling conventional drilling operations using a reduced scale set-up model.Briefly, the drilling process involves rock failure by a rotating drill bit. To rotate this drill bit from the top-end position (surface), the drilling rig's power source is used to turn a rotary table. A mechanism, consisting of master bushing and kelly is used to transmit the rotation from the rotary table (or top drive) to the drill string. The drill string is the subsurface component through which torque is transmitted from the surface to the bottom of the drilling system (downhole). It consists of connected lengths of drill pipes, the bottom hole assembly (BHA), and the drill bit. The BHA is the portion of the drill string between the drill pipe and the drill bit. It is made up, primarily, of drill collars (DC) and heavy weight drill pipe (HWDP).Previous studies have identified three types of vibrations that may occur during drilling operations: Torsional, Lateral and Axial, as cited in [2][3][4].In order to reproduce the phenomena inherent to the torsional vibrations present in the rotating drilling system e-mail: leopereiradias@yahoo.com.br e-mail: bruno.cayres@cefet-rj.br e-mail: hans@puc-rio.br a reduced-scale test rig set-up model (shown in Fig. 1) was developed at the PUC-Rio Dynamics and Vibration Laboratory. The set-up model consists of an electrical and a mechanical subsystems. Electrical subsystem represents the drilling rig's power source and the rotary table (or top drive), while the mechanical system represents the drill pipes, BHA and drill bit.The test rig consists of three degrees of freedom: disc 1 (R1), disc 2 (R2) and the DC-motor inertia. Also, it contains an electric ...

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“…Torqueand-drag models have recently seen significant development (see Tikhonov et al 2013;Mitchell et al 2013;and Ødegård et al 2013) and should soon be available to supplement earlier models for real-time automation applications. Additional models are under development for drillstring dynamics and other issues (e.g., see Rudat and Dashevskiy 2011). Koederitz and Johnson (2011) have investigated the use of drilling models-that is, models of the drilling process, such as the mechanical specific energy-in control systems designed for drilling-process optimization.…”

Section: Models and Simulatorsmentioning

confidence: 99%

Drilling-Systems Automation: Current State, Initiatives, and Potential Impact

Macpherson

Wardt²,

Florence

et al. 2013

SPE Drilling &Amp; Completion

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Drilling automation is the control of the drilling process by automatic means, ultimately reducing human intervention to a minimum. The concept of automating the drilling process has generated considerable interest, yet there is a lack of agreement on exactly what it is, what it entails, and how to implement it. As with industrial automation in the 1990s, the adoption of open standards enabling automation will have a significant impact on the underlying business model. In the oilfield-drilling industry, the business model describes the relationship between operator, drilling contractor, service company, and equipment supplier.The goal of drilling-systems automation is to increase productivity and quality, improve personnel safety, and effectively manage risk. Principal drivers of drilling automation include well complexity, data overload, efficiency, repetitive well manufacturing, access to limited expert resources, knowledge transfer as a result of the exodus of skilled employees, and health, safety, and environmental concerns. With so many drivers, and their potential economic benefits, it is understandable that there are many automation-related initiatives within the industry.Drilling through geopressured, possibly erratic, lithologies to a remote and possibly poorly defined target in a safe manner is not a simple task to automate. It is challenging. Drilling automation focuses on the drilling system and drilling operations, which entail combining various subsystems, including the downhole bottomhole assembly (BHA) and its measurement and active components, the drillstring, fluid, and drilling rig and its subassemblies. Operations include conventional overbalanced-, managed-pressure-, and underbalanced-drilling operations, and their various procedures, such as tripping and making connections. This paper examines and defines drilling-systems automation, its drivers, enablers and barriers, and its current state and goals. In particular, the paper looks at the vision of drilling-systems automation, and the role played by open, collaborative initiatives among all segments of the drilling industry. Although commitment to automation by the drilling industry appears by many to lag behind the level of commitment in other major industries, there are segments of the drilling industry that have reached a high level of automation on a commercial basis. There is also significant collaboration among interested parties in creating a standardized, open environment for data flow to foster the development of systems automation.

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Development of an Innovative Model-Based Stick/Slip Control System

Cited by 38 publications

References 19 publications

Stick–slip vibrations in oil well drillstring: A review

Stick–slip vibrations in oil well drillstring: A review

Numerical Application of a Stick-Slip Control and Experimental Analysis using a Test Rig

Drilling-Systems Automation: Current State, Initiatives, and Potential Impact

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