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Investigation Of Coupled Axial Lateral Torsional Drillstring Vibrations Using A Multi Body Dynamics Approach
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Book Synopsis Investigation of Coupled Axial-lateral-torsional Drillstring Vibrations Using a Multi-body Dynamics Approach by : Ehsan Fallahi
Download or read book Investigation of Coupled Axial-lateral-torsional Drillstring Vibrations Using a Multi-body Dynamics Approach written by Ehsan Fallahi and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Drillstring vibration is a very crucial phenomenon which has a great effect on the drilling process. The drillstring is responsible to transfer rotary motion and energy to the drill bit. Unwanted vibration causes reduction in the rate of penetration (ROP), bit wear and connection failure between drillstring parts. In this thesis, a model of a realistic drill collar is generated which can predict any possible motion of the drill collar. This study contains several analyses about drillstring vibration in three main modes. The focus is on the drill collar section of the drillstring because of the importance of this section in vibration generation of the whole drillstring. This study attempts to determine the vibration behavior of the drill collar in axial, lateral and torsional directions in the presence of vibration-assisted rotary drilling (VARD) and unbalanced rotation. The model includes self weight, hydraulic forces due to drilling mud circulation and most realistic boundary condition for each particular scenario. This model also can be used for coupled vibration states and determination of vibration behavior of the drillstring in three coupled modes, simultaneously. Simulation results show the vibration behavior of the drillstring due to several cases and boundary conditions. The time response to each single mode is expressed and will be validated by finite element method (FEM). The vibration behavior of the rotating drillstring in three coupled modes will be studied using unbalanced rotation of the drillstring. The rock-bit interaction will also be applied to the model. Finally, the effect of the VARD tool will be examined.
Book Synopsis Modeling and Simulation of Vibration in Deviated Wells by : Md. Mejbahul Sarker
Download or read book Modeling and Simulation of Vibration in Deviated Wells written by Md. Mejbahul Sarker and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: During the engineering of deviated well, drillstring is in the complicated moving state, strong vibration is the main reason that induces drillstring failure. Drillstring vibrations usually have axial vibration, lateral vibration, torsional vibration and the drillstring near the bottom of well usually coupled vibrates strongly. A dynamic model to predict the effect of drillstring parameters on the type and severity of vibration is desired by the oil industry, to understand and prevent conditions that lead to costly downhole tool failures and expensive tripping or removal of the string from the wellbore. High-fidelity prediction of lateral vibrations is required due to its coupling with potentially destructive axial and torsional vibration. This research work analyses the dynamics of a horizontal oilwell drillstring. In this dynamics, the friction forces between the drillstring and the borehole are relevant and uncertain. Drillstring contact with its borehole, which can occur continuously over a line of contact for horizontal shafts such as drillstrings, generates normal forces using a user-definable stiff spring constitutive law. Tangential contact forces due to friction between the drillstring and borehole must be generated in order for whirl to occur. The potential for backward whirl and stick-slip requires the transition between static and dynamic Coulomb friction. The proposed model computes the relative velocity between sliding surfaces when contact occurs, and enforces a rolling-without-slip constraint as the velocity approaches zero. When the surfaces become 'stuck', a force larger than the maximum possible static friction force is required to break the surfaces loose, allowing sliding to resume. The drillstring bottom-hole-assembly has been modeled using a three-dimensional multibody dynamics approach implemented in vector bond graphs. Rigid lumped segments with 6 degrees of freedom are connected by axial, torsional, shear, and bending springs to approximate continuous system response. Parasitic springs and dampers are used to enforce boundary conditions. A complete deviated drillstring has been simulated by combining the bottom-hole-assembly model with a model of drill pipe and collars. The pipe and collars are modeled using a lumped-segment approach that predict axial and torsional motions. The proposed dynamic model has been incorporated the lumped segment approach which has been validated with finite element representation of shafts. Finally, the proposed contact and friction model have been validated using finite element LS-DYNA® commercial software. The model can predict how axial and torsional bit-rock reactions are propagated to the surface, and the role that lateral vibrations near the bit plays in exciting those vibrations and stressing components in the bottom-hole-assembly. The proposed model includes the mutual dependence of these vibrations, which arises due to bit-rock interaction and friction dynamics between drillstring and wellbore wall. The model can simulate the downhole axial vibration tool (or Agitator®). Simulation results show a better weight transfer to the bit, with a low frequency and high amplitude force excitation giving best performance but can increase the severity of lateral shock. The uniqueness of this proposed work lies in developing an efficient yet predictive dynamic model for a deviated drillstring.
Book Synopsis Dynamic of Tubing String in Complex Oil and Gas Well: Theory and Application by : Xiaoqiang Guo
Download or read book Dynamic of Tubing String in Complex Oil and Gas Well: Theory and Application written by Xiaoqiang Guo and published by Springer Nature. This book was released on with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Elastodynamic and Finite Element Analysis of Coupled Lateral-axial Vibration of a Drillstring with a Downhole Vibration Generator and Shock Sub by : Ahmad Ghasemloonia
Download or read book Elastodynamic and Finite Element Analysis of Coupled Lateral-axial Vibration of a Drillstring with a Downhole Vibration Generator and Shock Sub written by Ahmad Ghasemloonia and published by . This book was released on 2013 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Well Path, Tortuosity and Drillstring Design on the Transmission of Axial and Torsional Vibrations from the Bit and Mitigation Control Strategies by : Roman J. Shor
Download or read book The Effect of Well Path, Tortuosity and Drillstring Design on the Transmission of Axial and Torsional Vibrations from the Bit and Mitigation Control Strategies written by Roman J. Shor and published by . This book was released on 2016 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: As well designs become increasingly complicated, a complete understanding of drillstring vibrations is key to maximize drilling efficiency, to reduce drillstring dysfunction and to minimize drillstring, tool, and borehole damage. Torque and drag models exist that seek to quantify the effects of borehole inclination and tortuosity on static friction along the drillstring; however, the effects on dynamic friction remains poorly understood. This dissertation begins with a review of the past fifty years of work on drillstring dynamics models, an overview of the proposed control strategies and a summary deployed vibration mitigation applications within the drilling industry. Derivations from first principles of a series of computationally efficient axial and torsional drillstring models in both the frequency and time domains are then presented and verified with field data. The transfer matrix approach is used to predict the severity of axial vibrations along the drillstring and is verified using a series of case studies using field data. Harmonic axial vibrations within drillstrings are either induced intentionally, in the case of axial oscillation tools midway along the drillstring, or unintentional, in the case of bit bounce. Two case studies of bit bounce are first evaluated to ensure model validity for a harmonic excitation at a the bit and the model is found to accurately predict bit bounce based on surface rotation rates. Induced axial oscillations, generated by axial oscillation tools, are then investigated to quantify friction reduction and drilling efficiency improvements. Optimal placement is found to depend on wellbore geometry, but is usually restricted to periodic regions of the drillstring. These optimizations are then verified using field trials and suggest that improved placement can result in 20% or more reduction in friction along the drillstring. Two applications of torsional drillstring vibrations are then investigated -- stick slip mitigation and drillstring imaging. The time domain form of the torsional drillstring model is used first to evaluate the effectiveness of three types of top drive controllers -- stiff controllers, tuned PI controllers and impedance matching controllers -- in mitigating stick slip oscillations. Then, the transfer matrix method is applied to evaluate the effect of wellbore geometry on drillstring mobility to conclude that higher order modes of stick slip may become dominant in non-vertical wellbores. The feasibility of drillstring imaging using torsional signals from surface is then investigated to identify inputs and methods that show promise in three setups of varying complexity -- a hanging beam, a laboratory drillstring model and a drilling rig. Two techniques show promise -- white noise injection and model fitting of a step response -- in identifying larger features, including drillstring length and BHA location. However, low sampling frequencies and low bandwidth inputs reduce the ability to image small features such as friction points along the wellpath.
Book Synopsis Dynamic Analysis of a Drill-string Under Deterministic and Random Excitations by : Hongyuan Qiu
Download or read book Dynamic Analysis of a Drill-string Under Deterministic and Random Excitations written by Hongyuan Qiu and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Drill-strings are slender structures used to dig into the rock in search of oil and gas. Failures of drill-strings are time and money consuming and therefore the dynamics of drill-strings must be investigated and carefully controlled. In the thesis, a dynamic model of the drill-string that is suitable for predicting axial, torsional and lateral vibrations is built using Euler-Bernoulli beam theory. The drillstring is driven by a DC motor on the top and is subjected to distributed loads due to its own weight as well as bit/formation interaction. The model is axial-torsional, lateral-torsional coupled. Under deterministic excitations, the model captures stickslip behavior in drilling operation. Analysis on its negative effect on drilling performance is made, and potential mitigation measures are also discussed. In random model, the excitations to the drill-bit are modeled as combination of deterministic and random components. Monte Carlo (MC) simulation is employed to obtain the statistics of the response. Two cases of random excitation with different intensities are investigated. The results from MC simulation are compared against that from deterministic case. Secondly, the thesis focuses on the drill-string torsional vibration and its stick-slip analysis. A finite element model of the drillstring with inclusion of both deterministic and random excitations is also developed. Simulation is carried out under certain parameters and it is shown that in deterministic case the torsional vibration may behave stick-slip. With change of some parameters, bifurcation and chaos of the system are observed. In the random case, Monte Carlo simulation and path integration method are used to capture the probabilistic information of the response. The results of path integration match well to those of deterministic cases. Although there are some limitations, this thesis will help the author better understand drill-string downhole behaviors and lay a foundation for further research work.
Book Synopsis Investigation of Torsional Vibrations in a Drillstring Using Modeling and Laboratory Experimentation by : Parimal Arjun Patil
Download or read book Investigation of Torsional Vibrations in a Drillstring Using Modeling and Laboratory Experimentation written by Parimal Arjun Patil and published by . This book was released on 2013 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conferences--2005 by :
Download or read book Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conferences--2005 written by and published by . This book was released on 2005 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Robot and Multibody Dynamics by : Abhinandan Jain
Download or read book Robot and Multibody Dynamics written by Abhinandan Jain and published by Springer Science & Business Media. This book was released on 2010-12-17 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Robot and Multibody Dynamics: Analysis and Algorithms provides a comprehensive and detailed exposition of a new mathematical approach, referred to as the Spatial Operator Algebra (SOA), for studying the dynamics of articulated multibody systems. The approach is useful in a wide range of applications including robotics, aerospace systems, articulated mechanisms, bio-mechanics and molecular dynamics simulation. The book also: treats algorithms for simulation, including an analysis of complexity of the algorithms, describes one universal, robust, and analytically sound approach to formulating the equations that govern the motion of complex multi-body systems, covers a range of more advanced topics including under-actuated systems, flexible systems, linearization, diagonalized dynamics and space manipulators. Robot and Multibody Dynamics: Analysis and Algorithms will be a valuable resource for researchers and engineers looking for new mathematical approaches to finding engineering solutions in robotics and dynamics.
Book Synopsis A Comprehensive Model of Drill-string Dynamics Using Cosserat Rod Theory by : Marcos Silveira
Download or read book A Comprehensive Model of Drill-string Dynamics Using Cosserat Rod Theory written by Marcos Silveira and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The drill-strings used in drilling operate under extreme condi- tions, therefore, an accurate understanding of their dynamics is necessary and has attracted much interest. Although a bottom hole assembly (BHA) is to a great ex- tent responsible for the dynamics of the system, the in uence of the drill-pipes has been increasingly neglected by current models. Their dynamics and geometrical behaviour should be better analysed for a deeper understanding of underlying phe- nomena. For example, under stick-slip oscillations, the torque on the drill-string may cause torsional buckling of the drill-pipes, incurring in helical con guration, in which the apparent length is reduced, a ecting the forces at the bit{rock interface. With such behaviour and interactions in mind, this work focuses on elaborating a comprehensive mathematical model to investigate the dynamics of drill-strings, with attention to the drill-pipes section. Firstly, lower dimensional models are used to analyse the stick-slip limit cycle and its limits of existence. Then, a model developed for MEMS is used as a base for a comprehensive model using the formu- lation of Cosserat rods. Relevant boundary conditions are applied and a numerical simulation procedure is established. Simulations are performed for a range of sce- narios under stick-slip occurrence, and the behaviour of the drill-pipes is analysed. Focus is then given to axial vibrations with bit-bounce and the in uence on stick- slip, later to lateral vibrations with whirling motion of the drill-pipes, and nally to helical con gurations, taken by the drill-string under combined torsional, axial and lateral loads, showing the consequent shortening of the drill-string.
Download or read book Friction Dynamics written by Xiandong Liu and published by Woodhead Publishing. This book was released on 2016-07-20 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Friction Dynamics: Principles and Applications introduces readers to the basic principles of friction dynamics, which are presented in a unified theoretical framework focusing on some of the most important engineering applications. The book's chapters introduce basic concepts and analytical methods of friction dynamics, followed by sections that explore the fundamental principles of frictions. Concluding chapters focus on engineering applications in brake dynamics, the friction dynamics of rods used in oil suck pump systems, and the friction impact dynamics of rotors. This book provides comprehensive topics and up-to-date results, also presenting a thorough account of important advancements in friction dynamics which offer insights into varied dynamic phenomena, helping readers effectively design and fabricate stable and durable friction systems and components for various engineering and scientific friction dynamical systems. - Investigates the most critical engineering and scientific applications - Provides the most comprehensive reference of its kind - Offers a systematic treatment and a unified framework - Explores cutting-edge methodologies to address non-stationary, non-linear dynamics and control
Book Synopsis Reservoir Formation Damage by : Faruk Civan
Download or read book Reservoir Formation Damage written by Faruk Civan and published by Elsevier. This book was released on 2011-08-30 with total page 1135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reservoir Formation Damage, Second edition is a comprehensive treatise of the theory and modeling of common formation damage problems and is an important guide for research and development, laboratory testing for diagnosis and effective treatment, and tailor-fit- design of optimal strategies for mitigation of reservoir formation damage. The new edition includes field case histories and simulated scenarios demonstrating the consequences of formation damage in petroleum reservoirsFaruk Civan, Ph.D., is an Alumni Chair Professor in the Mewbourne School of Petroleum and Geological Engineering at the University of Oklahoma in Norman. Dr. Civan has received numerous honors and awards, including five distinguished lectureship awards and the 2003 SPE Distinguished Achievement Award for Petroleum Engineering Faculty. - Petroleum engineers and managers get critical material on evaluation, prevention, and remediation of formation damage which can save or cost millions in profits from a mechanistic point of view - State-of-the-Art knowledge and valuable insights into the nature of processes and operational practices causing formation damage - Provides new strategies designed to minimize the impact of and avoid formation damage in petroleum reservoirs with the newest drilling, monitoring, and detection techniques
Book Synopsis IUTAM Symposium on Nonlinear Dynamics for Advanced Technologies and Engineering Design by : Marian Wiercigroch
Download or read book IUTAM Symposium on Nonlinear Dynamics for Advanced Technologies and Engineering Design written by Marian Wiercigroch and published by Springer Science & Business Media. This book was released on 2013-01-11 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear dynamics has been enjoying a vast development for nearly four decades resulting in a range of well established theory, with the potential to significantly enhance performance, effectiveness, reliability and safety of physical systems as well as offering novel technologies and designs. By critically appraising the state of the art, it is now time to develop design criteria and technology for new generation products/processes operating on principles of nonlinear interaction and in the nonlinear regime, leading to more effective, sensitive, accurate, and durable methods than what is currently available. This new approach is expected to radically influence the design, control and exploitation paradigms, in a magnitude of contexts. With a strong emphasis on experimentally calibrated and validated models, contributions by top-level international experts will foster future directions for the development of engineering technologies and design using robust nonlinear dynamics modelling and analysis.
Book Synopsis Investigation of Drillstring Vibration Reduction Tools by : Mohammed Fayez Al Dushaishi
Download or read book Investigation of Drillstring Vibration Reduction Tools written by Mohammed Fayez Al Dushaishi and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Drilling related problems such as drillstring vibration is an important cause of premature failure of drillstring components and drilling inefficiency. The vibration of drillstring interferes with measurement collected while drilling. In severe cases, drillstring vibration will lead to wellbore instability that will result in an increase in the operation cost. In the late 1980's, a lot of studies and techniques were developed to mitigate drillstring vibration and downhole vibration measurements were introduced to the industry in two forms; real time measurements and memory devices measurements. A study of drillstring vibration of three different wells located in the Norwegian North Sea was analyzed. The bottom hole assembly (BHA) of two wells consisted of anti-vibration technology. The study involved a verification of anti stalling technology (AST) and V-stab vibration reduction tools. Part of the study illustrates the different in lateral vibration in different wells of matching lithology which include a statistical analysis of anti-vibration tools performance. Finally, a statistical analysis was conducted on downhole vibration measurement to investigate the sampling rate of the device. Alternating lithology has a big impact on lateral vibration; however, lateral vibration is not the same for different wells in the same formations due to the difference in the BHA assemblies. The study showed that lateral vibration using the V-stab was lower than the one using the AST tool. Considering torsional vibration, the analysis reveled [sic] that V-stab has a lower stick/slip severity than the AST tool. The field study showed that the roller-cone bit generates less torsional vibration than the PDC bit due to different cutting actions. One of the important findings was that there was no correlation between drillstring vibration and mechanical specific Energy (MSE)"--Abstract, leaf iii
Book Synopsis Seismic While Drilling by : F.B Poletto
Download or read book Seismic While Drilling written by F.B Poletto and published by Elsevier. This book was released on 2004-06-30 with total page 547 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to give a theoretical and practical introduction to seismic-while-drilling by using the drill-bit noise. This recent technology offers important products for geophysical control of drilling. It involves aspects typical of borehole seismics and of the drilling control surveying, hitherto the sole domain of mudlogging. For aspects related to the drill-bit source performance and borehole acoustics, the book attempts to provide a connection between experts working in geophysics and in drilling. There are different ways of thinking related to basic knowledge, operational procedures and precision in the observation of the physical quantities. The goal of the book is to help "build a bridge" between geophysicists involved in seismic while drilling - who may need to familiarize themselves with methods and procedures of drilling and drilling-rock mechanics - and drillers involved in geosteering and drilling of "smart wells" - who may have to familiarize themselves with seismic signals, wave resolution and radiation. For instance, an argument of common interest for drilling and seismic while drilling studies is the monitoring of the drill-string and bit vibrations. This volume contains a large number of real examples of SWD data analysis and applications.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1992 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low-Complexity Controllers for Time-Delay Systems by : Alexandre Seuret
Download or read book Low-Complexity Controllers for Time-Delay Systems written by Alexandre Seuret and published by Springer Science & Business Media. This book was released on 2014-04-12 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume in the newly established series Advances in Delays and Dynamics (ADD@S) provides a collection of recent results on the design and analysis of Low Complexity Controllers for Time Delay Systems. A widely used indirect method to obtain low order controllers for time delay systems is to design a controller for the reduced order model of the plant. In the dual indirect approach, an infinite dimensional controller is designed first for the original plant model; then, the controller is approximated by keeping track of the degradation in performance and stability robustness measures. The present volume includes new techniques used at different stages of the indirect approach. It also includes new direct design methods for fixed structure and low order controllers. On the other hand, what is meant by low complexity controller is not necessarily low order controller. For example, Smith predictor or similar type of controllers include a copy of the plant internally in the controller, so they are technically infinite dimensional. However, they have very nice numerical properties from the point of reliable implementation. Therefore, such predictor-based controllers are considered as low complexity. This book includes new predictor-based design techniques, with several application examples.
