Drill Bit Contact Dynamics Including Side Cutting: Simulation and Validation

2017 ◽  
Vol 139 (2) ◽  
Author(s):  
Alfonso Callejo ◽  
Siamak Arbatani ◽  
József Kövecses ◽  
Masoud Kalantari ◽  
Nick R. Marchand
Keyword(s):  
Experimental Validation ◽  
Contact Forces ◽  
Contact Dynamics ◽  
Specific Method ◽  
Directional Drilling ◽  
Simulation Framework ◽  
Finite Segment ◽  
Oil Drilling ◽  
Simulation Techniques ◽  
Drilling Tools

Simulation techniques are increasingly becoming popular in recent years as a way of simulating oil drilling processes. Among them, directional drilling is a specific method that benefits enormously from such numerical techniques, inasmuch as the estimation of the wellbore curvature is crucial and cannot be properly estimated through approximate geometry methods. We present here some of the latest advances in bit contact dynamics, wellbore update algorithms, and experimental validation of side cutting, in the context of a finite element (FE) and finite segment simulation framework. The framework is based on the high-fidelity dynamic simulation of the mechanical system, including detailed geometry, large displacements, and accurate contact forces. The theoretical aspects, along with the experimental results, are thoroughly presented. Overall, this paper constitutes a step toward a more deterministic way of calculating build rates and designing downhole drilling tools.

scholarly journals Design and Calibration of a Force/Tactile Sensor for Dexterous Manipulation

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 966 ◽  
Author(s):  
Marco Costanzo ◽  
Giuseppe De Maria ◽  
Ciro Natale ◽  
Salvatore Pirozzi
Keyword(s):  
Experimental Validation ◽  
Sensory System ◽  
Tactile Sensor ◽  
Contact Forces ◽  
Dexterous Manipulation ◽  
Soft Contact ◽  
Grasping Force ◽  
Sense Of Touch ◽  
Human Sense ◽  
Robotic Applications

This paper presents the design and calibration of a new force/tactile sensor for robotic applications. The sensor is suitably designed to provide the robotic grasping device with a sensory system mimicking the human sense of touch, namely, a device sensitive to contact forces, object slip and object geometry. This type of perception information is of paramount importance not only in dexterous manipulation but even in simple grasping tasks, especially when objects are fragile, such that only a minimum amount of grasping force can be applied to hold the object without damaging it. Moreover, sensing only forces and not moments can be very limiting to securely grasp an object when it is grasped far from its center of gravity. Therefore, the perception of torsional moments is a key requirement of the designed sensor. Furthermore, the sensor is also the mechanical interface between the gripper and the manipulated object, therefore its design should consider also the requirements for a correct holding of the object. The most relevant of such requirements is the necessity to hold a torsional moment, therefore a soft distributed contact is necessary. The presence of a soft contact poses a number of challenges in the calibration of the sensor, and that is another contribution of this work. Experimental validation is provided in real grasping tasks with two sensors mounted on an industrial gripper.

scholarly journals Rotary steerable systems: mathematical modeling and their case study

2021 ◽  
Vol 11 (6) ◽  
pp. 2743-2761
Author(s):  
Caetano P. S. Andrade ◽  
J. Luis Saavedra ◽  
Andrzej Tunkiel ◽  
Dan Sui
Keyword(s):  
Directional Drilling ◽  
Steering Control ◽  
Fundamental Physics ◽  
Drilling Tools ◽  
Drilling Operations ◽  
Beam Bending ◽  
Extended Reach Drilling ◽  
And Control ◽  
2D And 3D

AbstractDirectional drilling is a common and essential procedure of major extended reach drilling operations. With the development of directional drilling technologies, the percentage of recoverable oil production has increased. However, its challenges, like real-time bit steering, directional drilling tools selection and control, are main barriers leading to low drilling efficiency and high nonproductive time. The fact inspires this study. Our work aims to contribute to the better understanding of directional drilling, more specifically regarding rotary steerable system (RSS) technology. For instance, finding the solutions of the technological challenges involved in RSSs, such as bit steering control, bit position calculation and bit speed estimation, is the main considerations of our study. Classical definitions from fundamental physics including Newton’s third law, beam bending analysis, bit force analysis, rate of penetration (ROP) modeling are employed to estimate bit position and then conduct RSS control to steer the bit accordingly. The results are illustrated in case study with the consideration of the 2D and 3D wellbore scenarios.

scholarly journals A Maintainance Cost Model Oil Drilling Tools

2009 ◽  
Vol 1 (2) ◽  
Author(s):  
Antonio Henriques De Araujo Júnior ◽  
Pedro Pereia Nunes Filho ◽  
Isabel Cristina Dos Santos ◽  
José Glênio Medeiros de Barros
Keyword(s):  
Rio De Janeiro ◽  
Cost Model ◽  
Oil Drilling ◽  
Drilling Tools ◽  
Model Oil

O objetivo deste trabalho é propor um modelo de custeio por atividade para estimar os custos de manutenção de ferramentas utilizadas na perfuração de poços de petróleo. Procura-se demonstrar a exeqüibilidade da aplicação de um sistema de custeio baseado em atividades, que permite apurar com maior precisão o custo dos processos produtivos de uma empresa de serviços por meio do custeio das suas atividades e dos seus processos produtivos. O trabalho foi desenvolvido como um estudo de caso, a partir de pesquisa de campo em uma empresa de manutenção de ferramentas com atuação no norte do Estado do Rio de Janeiro. A pesquisa demonstrou que o custeio por atividades pode ser empregado como ferramenta de tomada de decisão possibilitando sua utilização, tanto para gestão de custos como para racionalização das atividades produtivas e não produtivas, ao permitir reconhecer a real agregação de valor das atividades aos produtos/serviço prestado.

An Efficient Erection Simulation Methodology for the Modular Construction of Offshore Platform Based on Points Cloud Data

2015 ◽  
Author(s):  
Jung Kwan Seo ◽  
Deok Eun Kim
Keyword(s):  
Laser Scanning ◽  
Three Dimensional ◽  
Measurement Data ◽  
Construction Process ◽  
Modular Construction ◽  
Simulation Framework ◽  
Simulation Methodology ◽  
Cloud Data ◽  
Simulation Techniques ◽  
Simulation Systems

Requests for the accurate planning of the erection process using modelling and simulation techniques have recently increased in many engineering fields, including shipbuilding and the offshore industries. In this study, an efficient erection simulation framework is proposed based on three-dimensional (3-D) measurement data that can support the development of various simulation systems for modular construction planning in the offshore and shipbuilding industries. The proposed simulation framework can be used to predict the erection state to optimise any gap, weak point and/or overlap of the modular construction process on the basis of 3-D laser scanning measurement data. To evaluate the efficiency and applicability of the proposed simulation framework, the framework is applied to the drillship modular erection process. The results show that the proposed simulation framework provides a consistent, integrated developmental environment for an erection process in the offshore industries. In addition, it can be expected that the time costs and risks of on-site fatality associated with the erection process will be reduced.

Modeling Contact Dynamics of Vanes With Adjustable Upstream Flow Angles

2012 ◽  
Author(s):  
Daniel Schurzig ◽  
Sebastian Tatzko ◽  
Lars Panning-von Scheidt ◽  
Jörg Wallaschek
Keyword(s):  
Coulomb Friction ◽  
Nonlinear Behavior ◽  
Simulation Method ◽  
Forced Response ◽  
Contact Forces ◽  
Contact Dynamics ◽  
Flow Angle ◽  
Complementarity Conditions ◽  
Time Stepping ◽  
Upstream Flow

In this paper, a simulation method is proposed for a sub-category of compressor vanes showing nonlinear behavior due to an adjustable upstream flow angle. The proposed algorithm computes the forced response of a single vane based on the New-mark time stepping scheme after reducing the structural matrices using the Craig-Bampton method. The contacts are modeled by Coulomb friction and Newton impact constraints. Contact forces are determined using linear complementarity conditions with decoupled orthogonal friction force directions. Different discretization methods for the cylindrical contact partners are proposed. Finally, numerical results are shown in order to validate the proposed algorithms.

FRICTIONAL INDETERMINANCY OF FORCES IN HARD-DISK PACKINGS

2003 ◽  
Vol 17 (29) ◽  
pp. 5623-5630 ◽  
Author(s):  
TAMÁS UNGER ◽  
JÁNOS KERTÉSZ
Keyword(s):  
Random Walk ◽  
Friction Coefficient ◽  
Contact Forces ◽  
Contact Dynamics ◽  
Force Fluctuations ◽  
Packing Structure ◽  
Hard Particles ◽  
Rigid Disks ◽  
Dynamics Simulations ◽  
Disk Packings

We study the statical indeterminacy of contact forces in 2D random frictional packings of perfectly rigid disks. Based on contact dynamics simulations we perform a random walk in the force space in order to explore the equilibrium force-states for a fixed packing structure. Our measurement is in agreement with the isostaticity of frictionless hard particles, in that case forces are fully determined. For non-zero friction coefficient the problem gets undetermined, the possible force fluctuations are growing with increasing friction up to a maximum at friction coefficient around 0.1. Further increase of friction reduces the force fluctuations on the average.

scholarly journals Tinjauan Penerapan Analisa Jabatan dan Komunikasi Organisasi sebagai Pengukuran Motivasi dan Dampaknya pada Kinerja Karyawan Berdasarkan Pendekatan SPSS VS LISREL

2012 ◽  
Vol 3 (1) ◽  
pp. 70
Author(s):  
Antonius Nico Kristanto ◽  
Haryadi Sarjono
Keyword(s):  
Data Processing ◽  
Significant Influence ◽  
Research Method ◽  
Survey Method ◽  
Oil Drilling ◽  
Drilling Tools ◽  
Manufacturing Company ◽  
Research Type ◽  
Chemical Materials

PT Indo Nuansa Jaya is a chemical materials manufacturing company for oil drilling and drilling tools in Indonesia. The selling level of chemical materials for drilling in 2008 has reached to 348 units, in 2009 to 549 units, and in 2010 decreased to 447 units. The research method used is survey method; meanwhile the research type is associative. Data is gathered from questionnaire to employees. Data processing is using SPSS 16.0 and then compared to the result from data processing using LISREL 8.80. The research resulted that the analysis of duties has relation in 0,628 and has significant influence in (0.516)2 = 26.63% towards motivation. From the result, it could be founded that motivation could influence employees performance in (0.412)2 or 16,97%.

Simultaneous Prediction of Muscle, Ligament and Tibiofemoral Contact Forces via Optimally Tracking Subject-Specific Gait Dynamics

2013 ◽  
Author(s):  
D. G. Thelen ◽  
K. W. Choi ◽  
A. Schmitz
Keyword(s):  
Joint Kinematics ◽  
Simulation Software ◽  
Contact Forces ◽  
Muscle Forces ◽  
Simulation Framework ◽  
Gait Dynamics ◽  
Knee Mechanics ◽  
Internal Joint ◽  
Subject Specific ◽  
And Cartilage

Computational models are needed to estimate soft tissue loads during movement. It would be ideal to perform such estimates on a subject-specific basis, where the information could be used clinically for assessing injury risk, planning treatment and monitoring rehabilitation outcomes. Musculoskeletal simulation software has evolved to the point that it is now relatively straight forward to estimate muscle forces needed to emulate subject-specific joint kinematics and kinetics [1]. These muscle forces can subsequently be used as boundary conditions in a knee mechanics model to estimate the associated ligament and cartilage loads [2]. However, this serial simulation approach may ignore inherent interactions between musculoskeletal dynamics and internal joint mechanics. That is, cartilage contact forces and ligament tension can potentially contribute to joint moment equilibrium [3]. Further, ligament stretch may allow joint kinematics to vary in a way that affects muscle moment arms and lines of action about the joint. Thus, it would be preferable if muscle, ligament and cartilage contact loads were estimated simultaneously so that these interactions are accounted for. The objective of this study was to incorporate a six degree of freedom tibiofemoral model into an existing subject-specific gait simulation framework [4]. In this study, we introduce the computational model, and then use it to track measured gait dynamics of a subject with an instrumented knee joint replacement. A comparison of the model-predicted and measured tibiofemoral contact forces provides a basis for assessing the validity of this novel co-simulation framework.

Pitch-Heave Dynamics of a Segmented Skirt Air Cushion

2002 ◽  
Vol 46 (02) ◽  
pp. 121-137
Author(s):  
T.A. Graham ◽  
P.A. Sullivan
Keyword(s):  
Nonlinear Response ◽  
Experimental Validation ◽  
Basic Structure ◽  
Quantitative Agreement ◽  
Contact Forces ◽  
Test Model ◽  
Air Supply ◽  
Surface Contact ◽  
Air Cushion ◽  
Heave Motion

The formulation and experimental validation of a mathematical model of the nonlinear pitch-heave dynamics of an uncompartmented, segmented skirt cushion system for an air cushion vehicle are described. This system relies on surface contact to attain static stiffness in pitch and roll. The formulation includes a dynamic model of the lift air system, the effect of segment flexibility on effective cushion capacitance and on hovergap, and hysteretic skirt-surface contact forces. Predictions of linear stability and of nonlinear response to pitch disturbances are made for two skirt materials, the first generating considerable hysteresis in pitch stiffness, and the second having much greater extensibility but negligible hysteresis. These predictions are compared with experimental results obtained from a 900 kg test model. The basic structure of the system's stability characteristics are correctly predicted; this includes a nonlinear pitch-heave instability associated with coupling between pitch and heave motion, and with the modulation of the cushion volume by pitch motion. However, there remain unaccounted sources of cushion damping. This and other factors, such as sensitivity of the predicted results to the flexure of the panels that form the model air supply plenum, make close quantitative agreement between theory and experiment difficult to achieve.

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