Experimental Investigation Of The Effect Of Axial Vibration Generated By Pressure Pulses On Drilling Performance
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Experimental Investigation Of The Effect Of Axial Vibration Generated By Pressure Pulses On Drilling Performance
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Author : Ahmed Elnahas
language : en
Publisher:
Release Date : 2014
Experimental Investigation Of The Effect Of Axial Vibration Generated By Pressure Pulses On Drilling Performance written by Ahmed Elnahas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
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.
Investigation Of Bit Rock Interaction For Rotary Drilling And Influence On Penetration Rate
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Author : Jinghan Zhong
language : en
Publisher:
Release Date : 2016
Investigation Of Bit Rock Interaction For Rotary Drilling And Influence On Penetration Rate written by Jinghan Zhong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
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.
Pulse Cavitation Vibrating Drilling Prototype Development And Evaluation
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Author : Oleksii Pronin
language : en
Publisher:
Release Date : 2012
Pulse Cavitation Vibrating Drilling Prototype Development And Evaluation written by Oleksii Pronin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Boring categories.
Investigation Of Drilling Performance And Penetration Mechanism Using Passive Vibration Assisted Rotary Drilling Technology
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Author : Md. Shaheen Shah
language : en
Publisher:
Release Date : 2020
Investigation Of Drilling Performance And Penetration Mechanism Using Passive Vibration Assisted Rotary Drilling Technology written by Md. Shaheen Shah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
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.
Investigation Of Enhancing Drill Cuttings Cleaning And Penetration Rate Using Cavitating Pressure Pulses
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Author : Sadegh Babapour
language : en
Publisher:
Release Date : 2014
Investigation Of Enhancing Drill Cuttings Cleaning And Penetration Rate Using Cavitating Pressure Pulses written by Sadegh Babapour and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Drilling efficiency is governed by rock cuttings removal by hydraulic forces. The mechanical force introduced by the drill bit removes the rock chips from the parent rock. The chips will be held down until the downward forces due to overburden pressure are overcome. The turbulent jet that flushes away these chips consists of static impingement and dynamic pressure fluctuations. Instead of providing high pressure and hence enhancing the pressure fluctuations of the turbulent jet by rig pumps, the existing fluid pressure can be used more effectively. A fluid passing a Convergent-Divergent venturi demonstrates significant pressure fluctuations due to the cavitation phenomenon. As the fluid passes the vena-contracta, according to the Bernoulli's principle, the fluid velocity increases and hence the pressure decreases. If pressure drops below the fluid vapor pressure, cavitation occurs and bubbles are created. Different prototypes were designed to investigate the probability of cavitation occurrence by using CFD simulations. The successful designs were venturis with diameters of 4 mm and 12 mm. Simulation software applies tetrahedral meshing to the prototype geometry for robust simulation results when geometry of the tool is complex. The results obtained confirmed the pressure pulses and occurrence of cavitation. An experimental setup consisting of a 12 mm venturi, two pressure sensors at upstream and downstream, and 3 load cells in a triangular combination, and a flow meter was used. The flow rate range was from 10 USGPM to 70 USGPM. The cavitation started at 25 USGPM with a shear noise that is the characteristics of a iii cavitating flow and the sensors recorded the pressure pulses at this point. The magnitude of pressure peaks ranged from 150 psi up to 600 psi. The second stage of the experiments was to investigate the effect of venturi and axial compliance in drilling. Compliant element used in these experiments consists of two plates with rubber mounts embedded between these two plates in an equilateral configuration. The rubber mounts enable the displacement of the upper plate on the base plate. An 8 mm venturi was also mounted on the drill string behind the bit as the vibration source. The experimental results show that the tool starts to cavitate and produce vibrations. The tool was tested with compliance and without compliance to seek the effects of the compliant element. Results show that when rigid (no compliance), the vibrations produced, did not have any significant effect on the rate of penetration (ROP). However, with integration of the compliant element, the vibrations produced by the tool intensified the natural vibration of the compliant element and the penetration rate increased.
Masters Theses In The Pure And Applied Sciences
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Author : W. H. Shafer
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Masters Theses In The Pure And Applied Sciences written by W. H. Shafer and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 22 (thesis year 1977) a total of 10,658 theses titles from 28 Canadian and 227 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. While Volume 22 reports theses submitted in 1977, on occasion, certain universities do report theses submitted in previous years but not reported at the time.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1966
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Mechanics, Applied categories.
Metals Abstracts
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Author :
language : en
Publisher:
Release Date : 1998
Metals Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Metallurgy categories.
Journal Of Lubrication Technology
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Author :
language : en
Publisher:
Release Date : 1974
Journal Of Lubrication Technology written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Engineering categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1992
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Aeronautics categories.