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The Effects Of Varying Vibration Frequency And Power On Eficiency In Vibration Assisted Rotary Drilling
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Book Synopsis The Effects of Varying Vibration Frequency and Power on Eficiency in Vibration Assisted Rotary Drilling by : Babatunde Olaiya Yusuf
Download or read book The Effects of Varying Vibration Frequency and Power on Eficiency in Vibration Assisted Rotary Drilling written by Babatunde Olaiya Yusuf and published by . This book was released on 2011 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Drilling Performance and Penetration Mechanism Using Passive Vibration Assisted Rotary Drilling Technology by : Md. Shaheen Shah
Download or read book Investigation of Drilling Performance and Penetration Mechanism Using Passive Vibration Assisted Rotary Drilling Technology written by Md. Shaheen Shah and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Drilling performance is an essential goal in the petroleum and mining industry. Drilling Rate of Penetration (ROP) is influenced by the operating parameter: torque, Weight on Bit (WOB), fluid flow rate, Revolution per Minute (rpm), rock related parameters (rock type, rock homogeneousness, rock anisotropy orientation), and mechanical parameters (bit type, configuration of the Bottom Hole Assembly (BHA)). The Drilling Technology Laboratory (DTL) at Memorial University of Newfoundland has incorporated the passive Vibration Assisted Rotational Drilling Technology (pVARD) as a drilling tool. This tool includes three parts within a compliant part, a part that dampens and a torque transmitting unit that is inside the BHA of the drill string. This tool utilizes the natural vibrations of the drilling process to increase drilling efficiency and rate of penetration. In this thesis, laboratory and field drilling tests have been conducted by first and second generation pVARD tools respectively which could play a positive role in improving drilling penetration rate through modified bit-rock compliance from conventional drilling. This research aims to develop a fundamental guideline for rock strength measurement and to interlink mechanical tests for the purpose of evaluating drilling performance. The compressive rock strength has an inverse relationship with drilling efficiency. The average Unconfined Compressive Strength (UCS) and Indirect Tensile Strength (ITS) of the granite were obtained to be 168.4 MPa and 16.3 MPa respectively by the mechanical loading frame in the laboratory parameters following American Society for Testing and Materials (ASTM) standard. The pVARD operational details are important for optimal configuration and best drilling results. The study focused on designing pVARD to be consistent with a Large Drilling Simulator (LDS) selecting optimal Belleville springs. Compression tests and numerical studies have been carried out using a mechanical frame and simulation analysis respectively, for different Belleville Spring stacking scenarios. Mechanical and simulation studies with details of pre-planned drilling experiments can provide important guidelines for optimizing pVARD basics. The hysteresis effect analysis of LDS-pVARD springs also provided a coherent idea of energy dissipation during the cycle test. Depending on the rock type and drilling parameters can provide pre-settings and configurations of pVARD for optimal drilling performance. Finally, this dissertation focuses on the effects of vibration on the performance of a diamond coring bit when drilling on hard rock with a first-generation small lab scale vibration tool pVARD. Thereafter, Drill off Tests (DOTs) have been performed using a Small Drilling Simulator (SDS) with axial vibrations on the drill string in laboratory conditions. The vibration properties have been adjusted to various settings of spring compliance and dampening (rubber) material. The results of the evaluation of the experimental data show that the ROP increased by a maximum of 28% keeping WOB within the operational limits. The results and knowledge obtained from this study will help to design third generation pVARD tools.
Book Synopsis Development of Laboratory and Field Scale Passive Vibration Assisted Rotary Drilling Tools by : Brock Gillis
Download or read book Development of Laboratory and Field Scale Passive Vibration Assisted Rotary Drilling Tools written by Brock Gillis and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Drilling Technology Laboratory (DTL) at Memorial University of Newfoundland has been focused on increasing drilling efficiency through the utilization of downhole vibrations, also known as Vibration Assisted Rotary Drilling (VARD). The pursuit of VARD technologies is split between active and passive vibrations and the current thesis looks at the design, development, and testing of a Passive Vibration Assisted Rotary Drilling tool (pVARD). The pVARD tool acts as a spring and damper inside the bottom hole assembly of the drill string. It is a system that is tuned to utilize the natural vibrations of the drilling process to increase drilling efficiency and rate of penetration. Two different tools were designed. First, a laboratory scale tool designed to allow analysis into pVARD to be performed on the DTL's inhouse small drilling simulator. This would allow for rapid testing of many spring damper configurations. The second, a field scale tool, that would be used with six-inch drill bits in the DTL's first field trial of VARD technology. Powered by a water well drilling rig, this tool would be used to drill shale and granite and explore the pVARD technology on an industrial scale. Both tools required the design of axial and torque taking members as well as the arrangement of the spring damper system. Specific design attention was paid to making the tools easily reconfigurable so that different spring damper arrangements could be tested, both in the lab, and the field. This investigation explores the testing results of these two tools as compared to one another, as well as learning from the operation of them in the field and how these learning will be used to improve the next generation of pVARD tools.
Book Synopsis Study of Belleville Springs and Bond Graph Analysis of Passive Vibration Assisted Rotary Drilling Tool by : Dipesh Maharjan
Download or read book Study of Belleville Springs and Bond Graph Analysis of Passive Vibration Assisted Rotary Drilling Tool written by Dipesh Maharjan and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 2008, the effect of active/passive sources of drilling vibration has been a topic of research at the Drilling Technology Laboratory of Memorial University of Newfoundland. Drill-off tests have been conducted in many different settings using fully instrumented lab-scale drill rigs (Small Drilling Simulator (SDS) and Large Drilling Simulator (LDS)) and through field trials in order to validate these effects and the researchers have been able to acquire substantially prominent results, which is evident from improved drilling rates and increased dynamic downhole weight on bit (DDWOB). One of the outcomes from those experiments is the development of novel passive Vibration assisted Rotary Drilling (p-VARD) Tool, which harnesses the vibration generated at bit-rock interface to improve the drilling rate and the measured DDWOB. The p-VARD tool uses different configuration of Belleville springs and elastomer to produce desired value of tool compliance and modify the damping. The research outcomes in this thesis explain the dynamic behaviour of the p-VARD tool and helps us understand the actual phenomenon inside the tool, which results in this behaviour. Mass-spring-damper schematics of the rigid and compliant drilling systems are analyzed with the help of bond graphs in 20-sim. Results show that the p-VARD can lower the drill string natural frequency significantly enabling it to resonate at the frequencies of the top drive. In order to facilitate the p-VARD experiments in a more controlled environment, the tool has been designed for the LDS, which is more advanced than the SDS. The dynamic simulation of the Belleville springs is in itself, a separate area of research that is used for the dynamic analysis of the p-VARD tool design. The LDS offers a wide range of rotary speeds and weight on bit and can be operated fully automatically or manually. P-VARD experiments in LDS will enable us to characterize the tool properties in more depth. The LDS p-VARD tool is designed with a minimum safety factor of 3.4 against the maximum torque generated by the LDS. It utilizes a uniformly grooved sensor plates with five identical and one distinct cross-section, which is attached to the outer shell to track the axial movement of the tool. The tool is designed such that the torque is transmitted from the inner shaft to the outer shell through four uniformly spaced keys and for fluid transmission, a 13 mm through hole is made through the middle of the tool.
Book Synopsis Vibration Assisted Machining by : Lu Zheng
Download or read book Vibration Assisted Machining written by Lu Zheng and published by John Wiley & Sons. This book was released on 2021-02-16 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book to comprehensively address the theory, kinematic modelling, numerical simulation and applications of vibration assisted machining Vibration Assisted Machining: Theory, Modelling and Applications covers all key aspects of vibration assisted machining, including cutting kinematics and dynamics, the effect of workpiece materials and wear of cutting tools. It also addresses practical applications for these techniques. Case studies provide detailed guidance on the design, modeling and testing of VAM systems. Experimental machining methods are also included, alongside considerations of state-of-the-art research developments on cutting force modeling and surface texture generation. Advances in computational modelling, surface metrology and manufacturing science over the past few decades have led to tremendous benefits for industry. This is the first comprehensive book dedicated to design, modelling, simulation and integration of vibration assisted machining system and processes, enabling wider industrial application of the technology. This book enables engineering students and professionals in manufacturing to understand and implement the latest vibration assisted machining techniques. Highlights include: Comprehensive coverage of the theory, kinematics modelling, numerical simulation and applications of vibration assisted machining (VAM) Case studies with detailed guidance on design, modelling and testing of VAM systems, as well as experimental machining methods Discussion of state-of-the-art research developments on cutting force modelling and surface texture generation Coverage of the history of VAM, its current applications and future directions for the technology Vibration Assisted Machining: Theory, Modelling and Applications provides engineering students, researchers, manufacturing engineers, production supervisors, tooling engineers, planning and application engineers and machine tool designers with the fundamentals of vibration assisted machining, along with methodologies for developing and implementing the technology to solve practical industry problems.
Book Synopsis Investigation of Bit-Rock Interaction for Rotary Drilling and Influence on Penetration Rate by : Jinghan Zhong
Download or read book Investigation of Bit-Rock Interaction for Rotary Drilling and Influence on Penetration Rate written by Jinghan Zhong and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis a comprehensive investigation of non-natural vibration on enhanced drilling performance is studied. The Drilling Technology Laboratory (DTL) at Memorial University of Newfoundland has been working on a passive Vibration Assisted Rotational Drilling (p-VARD) tool which helps to increase the drilling rate of penetration (ROP) during laboratory testing and filed work for this couple of years. It has been proven by laboratory experiments and filed work that axial vibration can play a dramatically positive role in improving drilling ROP. Meanwhile, the laboratory measurement and field trial results show that the new passive vibration tool with sensor-sub can provide compatible and accurate data to identify drill string motions including rotatory speed, bit orientation, and bit vibrations including axial, lateral, torsional vibrations and bit whirl. These raw data from each drilling experiment can supply a sufficient research basis for numerical simulation. This thesis focuses on the effect of axial vibration on polycrystalline diamond compact (PDC) bit drilling performance using Discrete Element Method (DEM) simulation and experiments with the new vibration tool. Drill-off tests were conducted in the laboratory with axial vibration on the drill string. Vibration properties were adjusted by different settings of spring compliance and dampening layers. In order to study the cutting performance of the new tool, a PFC2D (Particle Flow Code in 2 Dimensions) numerical model was developed to simulate the micro-crack generation and propagation during the drilling process in synthetic rock samples. This experimental data was used to calibrate this numerical model to real drilling situations. The analyses of the Mechanic Specific Energy (MSE), the Material Removal Rate (MRR) and the Depth of Cut (DOC) are compared with a non-vibration case to evaluate ROP and drilling efficiency. The simulations result demonstrated significant increase in drilling performance when the p-VARD tool was used in the process. Simulation results of the two types of conditions of tools were analyzed and compared in lab and field work experiment respectively. The experimental data agrees with numerical simulation results which indicate it as a promising method to simulate PDC cutter-rock interaction with DEM modelling using the new pVARD tool.
Book Synopsis Experimental Investigation of the Rate of Penetration of Vibration Assisted Rotary Drilling by : Heng Li
Download or read book Experimental Investigation of the Rate of Penetration of Vibration Assisted Rotary Drilling written by Heng Li and published by . This book was released on 2011 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of the Effect of Axial Vibration Generated by Pressure Pulses on Drilling Performance by : Ahmed Elnahas
Download or read book Experimental Investigation of the Effect of Axial Vibration Generated by Pressure Pulses on Drilling Performance written by Ahmed Elnahas and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Considering the fact that improving drilling efficiency contributes to the industry success, many academic organizations, industrial research organizations and companies have invested in research that leads to better drilling experience, time wise and efficiency wise. This thesis is a research based study that aims to find new methods to improve drilling efficiency. The study investigates the effect of vibration generated using periodic pressure pulses created at the bit by a down-hole tool on the drilling efficiency, and in fact demonstrates that the technology can improve drilling efficiency. The study is based on various sets of laboratory experiments, which were conducted to characterize the functionality of a Pressure Pulses Generating (PPG) down-hole tool, and to test the effect of the down-hole tool output on actual drilling experiments. Two different setups were used to conduct the experiments in laboratory environment. In the drilling experiments synthetic rock was used as test specimens with highly controlled properties and strength. The drilling experiments were conducted at different simulated down-hole condition, including bottom hole pressures, and different fluid flow rates. The study also highlighted the effect of varying the drill string compliance on the overall effect of induced down-hole axial vibration. Finally the study sets base for further investigation and experiment that will be conducted using a bigger scale setup similar to land drill rigs.
Book Synopsis Analysis and Control of Oilwell Drilling Vibrations by : Martha Belem Saldivar Márquez
Download or read book Analysis and Control of Oilwell Drilling Vibrations written by Martha Belem Saldivar Márquez and published by Springer. This book was released on 2015-03-09 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports the results of exhaustive research work on modeling and control of vertical oil well drilling systems. It is focused on the analysis of the system-dynamic response and the elimination of the most damaging drill string vibration modes affecting overall perforation performance: stick-slip (torsional vibration) and bit-bounce (axial vibration). The text is organized in three parts. The first part, Modeling, presents lumped- and distributed-parameter models that allow the dynamic behavior of the drill string to be characterized; a comprehensive mathematical model taking into account mechanical and electric components of the overall drilling system is also provided. The distributed nature of the system is accommodated by considering a system of wave equations subject to nonlinear boundary conditions; this model is transformed into a pair of neutral-type time-delay equations which can overcome the complexity involved in the analysis and simulation of the partial differential equation model. The second part, Analysis, is devoted to the study of the response of the system described by the time-delay model; important properties useful for analyzing system stability are investigated and frequency- and time-domain techniques are reviewed. Part III, Control, concerns the design of stabilizing control laws aimed at eliminating undesirable drilling vibrations; diverse control techniques based on infinite--dimensional system representations are designed and evaluated. The control proposals are shown to be effective in suppressing stick-slip and bit-bounce so that a considerable improvement of the overall drilling performance can be achieved. This self-contained book provides operational guidelines to avoid drilling vibrations. Furthermore, since the modeling and control techniques presented here can be generalized to treat diverse engineering problems, it constitutes a useful resource to researchers working on control and its engineering application in oil well drilling.
Book Synopsis Investigation of Vibration Related Signals for Monitoring of Large Open-pit Rotary Electric Blasthole Drills by : Edward A. Branscombe
Download or read book Investigation of Vibration Related Signals for Monitoring of Large Open-pit Rotary Electric Blasthole Drills written by Edward A. Branscombe and published by . This book was released on 2010 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigated the monitoring and analysis of signals related to the vibration of large rotary blasthole drills. The research focused on a machine with electric drilling actuators: such machines are used as primary production equipment in the drill-and-blast cycle of the surface (open-pit) mining process. The performance of such machines is limited by the onset of severe vibrations, which can arise due to the interaction of geology, bit, drill string, machine structure, and control settings. Experimental data for the thesis were obtained during field periods at an iron ore mine in Minnesota's Mesabi Iron Range. The data acquisition and signal analysis techniques which were utilized are presented, including smoothing of signals and calculated variables such as specific energy. Ambient vibration sources and vibration aliasing issues are investigated. Results from analyzing structural response tests indicate that, as expected, the natural frequency of the drill mast decreases with increasing bit depth - although the mounting position of accelerometers distorts this trend. The pull down force (weight on bit) is shown to have no appreciable impact on the mast's natural frequency, nor on the mast's damping ratio. A strong relationship between rotary speed and the dominant vibration frequency peaks at 3x and 6x rotary speed is demonstrated, and a physical explanation of the 6x vibration peak is postulated. The rotary motor current is shown to consistently exhibit frequency peaks at 3x and 6x rotation speed, indicating that this variable is a good candidate for use either as a substitute for accelerometer feedback, or as an auxiliary signal to detect down-the-hole vibration when it is not manifested by the mast mounted accelerometers. System identification is used to demonstrate that the dynamic relationship between vibration and rotary current, while it can be modeled locally, varies with depth and geology and hence is essentially a time-varying process. This results in the amplitude of rotary current not being usable as a proxy for vibration amplitude. Nonetheless, it is demonstrated that the root-mean-square (RMS) of the low frequency current oscillations, in a nonlinear combination with the RMS of the current signal as a whole, may be able to serve as a proxy for the RMS of the vibration signal.
Book Synopsis Dynamic Analysis of Bottom Hole Assembly with External Vibrating Force Excitation by : Lei Wang
Download or read book Dynamic Analysis of Bottom Hole Assembly with External Vibrating Force Excitation written by Lei Wang and published by . This book was released on 2013 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bit Wear Analysis and Optimization for Vibration Assisted Rotary Drilling (VARD) Using Impregnated Diamond Bits by : Alireza Abtahi
Download or read book Bit Wear Analysis and Optimization for Vibration Assisted Rotary Drilling (VARD) Using Impregnated Diamond Bits written by Alireza Abtahi and published by . This book was released on 2011 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modelling the Dynamics of Vibration Assisted Drilling Systems Using Substructure Analysis by : Vahid Ostad Ali Akbari
Download or read book Modelling the Dynamics of Vibration Assisted Drilling Systems Using Substructure Analysis written by Vahid Ostad Ali Akbari and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Vibration Assisted Machining (VAM) refers to a non-conventional machining process where high-frequency micro-scale vibrations are deliberately superimposed on the motion of the cutting tool during the machining process. The periodic separation of the tool and workpiece material, as a result of the added vibrations, leads to numerous advantages such as reduced machining forces, reduction of damages to the material, extended tool life, and enabling the machining of brittle materials. Vibration Assisted Drilling (VAD) is the application of VAM in drilling processes. The added vibrations in the VAD process are usually generated by incorporating piezoelectric transducers in the structure of the toolholder. In order to increase the benefits of the added vibrations on the machining quality, the structural dynamics of the VAD toolholder and its coupling with the dynamics of the piezoelectric transducer must be optimized to maximize the portion of the electrical energy that is converted to mechanical vibrations at the cutting edge of the drilling tool. The overall dynamic performance of the VAD system depends of the dynamics of its individual components including the drill bit, concentrator, piezoelectric transducer, and back mass. In this thesis, a substructure coupling analysis platform is developed to study the structural dynamics of the VAD system when adjustments are made to its individual components. In addition, the stiffness and damping in the joints between the components of the VAD toolholder are modelled and their parameters are identified experimentally. The developed substructure coupling analysis method is used for structural modification of the VAD system after it is manufactured. The proposed structural modification approach can be used to fine-tune the dynamics of the VAD system to maximize its dynamic performance under various operational conditions. The accuracy of the presented substructure coupling method in modeling the dynamics of the VAD system and the effectiveness of the proposed structural modification method are verified using numerical and experimental case studies.
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 The Effects of Vibration Frequencies on Physical, Perceptual and Cognitive Performance by : Ann Nakashima
Download or read book The Effects of Vibration Frequencies on Physical, Perceptual and Cognitive Performance written by Ann Nakashima and published by . This book was released on 2006 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the study of crewmember performance in land-driven vehicles, it is necessary to consider the effects of vibration on the human body. The Advanced Vehicle Architecture for a Net enabled Combat Environment Technology Demonstrator Project (ADVANCE TDP) aims to demonstrate improved crew performance using an integrated multi-layered vectronics network, supported by an active suspension system that stabilizes the vehicle platform. This review discusses the effects of different frequencies and magnitudes of vibration on specific aspects of performance: manual control, vision, perception and cognition. The results of the numerous studies that have been done on manual tracking and visual acuity during vibration exposure have been well-documented and summarized. It has been demonstrated that vibration does not significantly affect performance on simple perceptual tasks involving auditory or visual detection of signals. Vibration has been shown to have a negative effect on complex cognitive tasks; however, vibration frequency or magnitude dependencies have not been proven.
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 Human Response to Vibration by : Neil J. Mansfield
Download or read book Human Response to Vibration written by Neil J. Mansfield and published by CRC Press. This book was released on 2004-10-28 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through continued collaboration and the sharing of ideas, data, and results, the international community of researchers and practitioners has developed an understanding of many facets of the human response to vibration. At a time when the EU is preparing to adopt a directive on health risks arising from occupational exposure to vibration, Human Response to Vibration offers authoritative guidance on this complex subject. Individual chapters in the book examine issues relating to whole-body vibration, hand-arm vibration, and motion sickness. Vibration measurements and standards are also addressed. This book meets the needs of those requiring knowledge of human response to vibration in order to make practical improvements to the physical working environment. Written with the consultant, practitioner, researcher, and student in mind, the text is designed to be an educational tool, a reference, and a stimulus for new ideas for the next generation of specialists.
