Stick-Slip and Bit-Bounce Interaction in Oil-Well Drillstrings

2006 ◽  
Vol 128 (4) ◽  
pp. 268-274 ◽  
Author(s):  
Ahmet S. Yigit ◽  
Andreas P. Christoforou
Keyword(s):  
Control Strategies ◽  
Operating Conditions ◽  
Oil Well ◽  
Axial Motion ◽  
Stick Slip ◽  
Well Drilling ◽  
Wide Range ◽  
Equipment Failures ◽  
Drilling Operations ◽  
Major Factors

Drillstring vibrations and in particular stick-slip and bit-bounce are detrimental to oil-well drilling operations. Controlling these vibrations is essential because they may cause equipment failures and damage to the oil-well. A simple model that adequately captures the dynamics is used to simulate the effects of varying operating conditions on stick-slip and bit-bounce interactions. It is shown that the conditions at the bit/formation interface, such as bit speed and formation stiffness, are major factors in shaping the dynamic response. Due to the varying and uncertain nature of these conditions, simple operational guidelines or active rotary table control strategies are not sufficient to eliminate both stick-slip and bit-bounce. It is demonstrated that an additional active controller for the axial motion can be effective in suppressing both stick-slip and bit-bounce. It is anticipated that if the proposed approach is implemented, smooth drilling will be possible for a wide range of conditions.

scholarly journals A hybrid model for a drilling process for hydrocarbon well-boring operations

2017 ◽  
Vol 231 (4) ◽  
pp. 726-738
Author(s):  
MYA Alkaragoolee ◽  
KM Ebrahimi ◽  
R Whalley
Keyword(s):  
Drill String ◽  
Drilling Process ◽  
Stick Slip ◽  
Well Drilling ◽  
Hybrid Modelling ◽  
New Approach ◽  
Modelling Method ◽  
Drilling Equipment ◽  
Equipment Failures ◽  
Drilling Operations

In hydrocarbon well-drilling operations, self-excited, stick-slip vibration is considered as a source of drilling equipment failures, which also causes a reduction in the drilling penetration. This leads to delays and increase in the operational and equipment costs. A new approach using distributed-lumped (hybrid) modelling is considered as the first step in understanding the stick-slip phenomena in order to determine a solution to this problem. In this paper, a hybrid modelling scheme is the advocated modelling method proposed in contrast to the conventional lumped modelling. Three case studies are used to show that hybrid modelling is an accurate technique in the representation of stick-slip oscillations, particularly when the length of the drill string is high. The results show that the modelling technique adopted in this work can more accurately present the phenomena associated with stick-slip process.

Evaluation of Constitutive Equation for Stress in Solids in Porous Media Composed of Bridging Agents Used in Drilling Fluids

2012 ◽  
Vol 727-728 ◽  
pp. 1878-1883 ◽  
Author(s):  
Bruno Arantes Moreira ◽  
Flávia Cristina Assis Silva ◽  
Larissa dos Santos Sousa ◽  
Fábio de Oliveira Arouca ◽  
João Jorge Ribeiro Damasceno
Keyword(s):  
Porous Media ◽  
Constitutive Equation ◽  
Filter Cake ◽  
Drilling Fluid ◽  
Fluid Loss ◽  
Drilling Fluids ◽  
Oil Well ◽  
Well Drilling ◽  
Drilling Operations ◽  
The Stability

During oil well drilling processes in reservoir-rocks, the drilling fluid invades the formation, forming a layer of particles called filter cake. The formation of a thin filter cake and low permeability helps to control the drilling operation, ensuring the stability of the well and reducing the fluid loss of the liquid phase in the interior of the rocks. The empirical determination of the constitutive equation for the stress in solids is essential to evaluate the filtration and filter cake formation in drilling operations, enabling the operation simulation. In this context, this study aims to evaluate the relationship between the porosity and stress in solids of porous media composed of bridging agents used in drilling fluids. The concentration distribution in sediments was determined using a non-destructive technique based on the measure of attenuated gamma rays. The procedure employed in this study avoids the use of compression-permeability cell for the sediment characterization.

Sedimentation of solids in drilling fluids used in oil well drilling operations

2018 ◽  
Vol 162 ◽  
pp. 137-142 ◽  
Author(s):  
Nara Brandão Costa Santos ◽  
Flávia Marques Fagundes ◽  
Fábio de Oliveira Arouca ◽  
João Jorge Ribeiro Damasceno
Keyword(s):  
Drilling Fluids ◽  
Oil Well ◽  
Well Drilling ◽  
Drilling Operations

scholarly journals Data–Driven Control Techniques for Renewable Energy Conversion Systems: Wind Turbine and Hydroelectric Plants

2019 ◽  
Author(s):  
Silvio Simani ◽  
Stefano Alvisi ◽  
Mauro Venturini
Keyword(s):  
Renewable Energy ◽  
Energy Conversion ◽  
Wind Turbine ◽  
Control Strategies ◽  
Operating Conditions ◽  
Renewable Energy Resources ◽  
Control Techniques ◽  
Wide Range ◽  
Energy Conversion Systems ◽  
Hydroelectric Plants

The interest on the use of renewable energy resources is increasing, especially towards wind and hydro powers, which should be efficiently converted into electric energy via suitable technology tools. To this aim, data--driven control techniques represent viable strategies that can be employed for this purpose, due to the features of these nonlinear dynamic processes working over a wide range of operating conditions, driven by stochastic inputs, excitations and disturbances. Some of the considered methods, such as fuzzy and adaptive self--tuning controllers, were already verified on wind turbine systems, and similar advantages may thus derive from their appropriate implementation and application to hydroelectric plants. These issues represent the key features of the work, which provides some guidelines on the design and the application of these control strategies to these energy conversion systems. The working conditions of these systems will be also taken into account in order to highlight the reliability and robustness characteristics of the developed control strategies, especially interesting for remote and relatively inaccessible location of many installations.

Optimum control of an automotive direct injection diesel engine for low exhaust emissions

2001 ◽  
Vol 215 (11) ◽  
pp. 1225-1236 ◽  
Author(s):  
M Capobianco
Keyword(s):  
Diesel Engine ◽  
Control Strategies ◽  
Direct Injection ◽  
Experimental Information ◽  
Operating Conditions ◽  
Pollutant Emissions ◽  
Control Variables ◽  
Wide Range ◽  
Di Diesel Engine ◽  
Definition Of

The paper presents the latest results of a wide investigation performed at the University of Genoa on the control of automotive direct injection (DI) diesel engines. A dedicated procedure was developed which enables analysis of the behaviour of engine operating parameters as a function of two control variables with a limited amount of experimental information and the definition of proper control strategies. A first application of the procedure is presented in the paper with reference to a typical turbocharged DI diesel engine for automotive applications. The exhaust gas recirculation (EGR) rate and the position of the turbocharger waste-gate regulating valve were assumed as control variables and the behaviour of the most important engine parameters was analysed in a wide range for 15 steady state operating conditions related to the European driving cycle. Particular attention was paid to the most significant pollutant emissions and to the exhaust boundary conditions for the application of a low temperature lean de-NOx catalyst. Two different control strategies were also developed by which the catalyst conversion efficiency and the NOx engine tail pipe emission were individually optimized, taking account of some operating limits for specific parameters.

A Novel Micro-Positioning Stage With Large-Stroke and Adjustable Stiffness

2021 ◽  
Author(s):  
Zhijun Yang ◽  
Bingyu Cai ◽  
Ruiqi Li ◽  
Hao Peng ◽  
Youdun Bai
Keyword(s):  
Large Deformation ◽  
Control Strategies ◽  
Operating Conditions ◽  
Flexure Hinge ◽  
Pid Algorithm ◽  
Wide Range ◽  
Non Linear ◽  
Micro Motion ◽  
Motion Stage ◽  
Application Requirements

Abstract The existing micro-motion stage based on flexure hinge can hardly meet the requirements of a high-precision stage with large stroke and variable operating conditions (especially variable frequency operation). In this paper, a flexible hinge micro-motion stage with adjustable stiffness is presented. A wide range of stiffness and frequency adjustments are realized by changing the length of the flexure hinge through the movement of the support. However, the change on the stiffness of the flexure hinge is non-linear when is in large deformation. It is difficult to use the traditional PID algorithm to control such nonlinear system without the complete mathematical model, and much more complicated control strategies are required to deal with the condition of large deformation of the flexure hinge. In this paper, the active disturbance rejection control (ADRC) strategy is adopted to solve the above non-linear control problem without relying on the complete system model. A novel model-compensated ADRC based on the dynamic characteristics is proposed to further improve the performance of the micro-motion stage. Experiments show that the ADRC with model compensation (MADRC) can achieve high positioning and tracking precision faster than the conventional ADRC. The presented micro-motion stage based on stiffness-adjustable flexure hinges and MADRC design is capable to meet the industrial application requirements of large stroke or variable working conditions.

Monitoring and control strategies to manage pressure fluctuations during oil well drilling

2018 ◽  
Vol 166 ◽  
pp. 337-349 ◽  
Author(s):  
Márcia Peixoto Vega ◽  
Gabrielle Fontella de Moraes Oliveira ◽  
Lindoval Domiciano Fernandes ◽  
André Leibsohn Martins
Keyword(s):  
Control Strategies ◽  
Pressure Fluctuations ◽  
Oil Well ◽  
Monitoring And Control ◽  
Well Drilling ◽  
And Control

scholarly journals Multi-dimensional semi-analytical model for axial stick–slip of a rod sliding on a surface with Coulomb friction

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401983153
Author(s):  
Sigve Hovda
Keyword(s):  
Constant Velocity ◽  
Coulomb Friction ◽  
Element Model ◽  
Oil Well ◽  
Stick Slip ◽  
Well Drilling ◽  
Lumped Element ◽  
Fundamental Understanding ◽  
Real Time Applications ◽  
Lumped Element Model

A multi-dimensional lumped element model of a long non-rotating rod that moves on a slick surface with both dynamic and static Coulomb friction is outlined. The rod is accelerated to a constant velocity, and the free end of the rod experiences the effect of stick and slip. This article describes a new modeling approach, where the model is able to switch between different linear semi-analytical sub-models, depending on how much of the rod is moving. Fundamental understanding of the stick–slip effect is revealed, and a potential shortcoming of the model is also discussed. The model is computationally effective and may be suitable for real-time applications in, for instance, oil-well drilling.

Effect of Oxide Stabilizers and Surface Metallization on the Wetting Behaviour of Silver Based Brazing Alloys onto Zirconia Substrates for Oil Well Drill Bits Application

2012 ◽  
Vol 730-732 ◽  
pp. 191-196
Author(s):  
Jorge Carlos Pereira ◽  
Poliana Rochele Santos ◽  
João Moreno Silva ◽  
Rubens Maribondo Nascimento ◽  
Antonio Eduardo Martinelli
Keyword(s):  
Drilling Fluid ◽  
High Vacuum ◽  
Oil Well ◽  
Stabilized Zirconia ◽  
Well Drilling ◽  
Drill Bits ◽  
Metal Metal ◽  
Metal Ceramic ◽  
Drilling Operations ◽  
Ceramic Interfaces

Tricone drill bits with hard ceramic inserts are often used in oil well drilling operations. However, the cutting action and breakdown of the rock formation produces failures on the tricone bits, which mainly are related to wear, partial or total rupture of the drill bit body or ceramic inserts, thermal shock, and corrosion. Brazing is a well established technique to joint metal-metal, ceramic-ceramic and ceramic-metal materials. Wetting phenomena plays an essential role in the production of metal/ceramic interfaces if a liquid phase is present. Stabilized zirconia with yttria and magnesia can be an interesting material for hard ceramic inserts application on drill bits when oil well or the drilling fluid has acid characteristics. In this work, silver based brazing alloys were melted onto zirconia substrates under high vacuum. The effect of oxide stabilizers and the metallized surface on the wetting behaviour were studied. Better results were found for the yttria stabilized zirconia system using AgCu with 3% Ti as filler alloy.

Fundamentals of Microwave Heating and Drying of Drilled Cuttings

2017 ◽  
Vol 899 ◽  
pp. 528-533 ◽  
Author(s):  
Arley Silva Rossi ◽  
Marina Seixas Pereira ◽  
Jéssika Marina dos Santos ◽  
Irineu Petri Jr. ◽  
Carlos Henrique Ataíde
Keyword(s):  
Microwave Heating ◽  
Drilling Fluid ◽  
Microwave Drying ◽  
Drilling Fluids ◽  
Oil Well ◽  
Environmental Legislation ◽  
Well Drilling ◽  
Alternative Technologies ◽  
Drilling Operations ◽  
Kinetics Of

Drilled cuttings contaminated by non aqueous drilling fluids are the major waste from oil well drilling activities. More restrictive environmental legislation has led to the search for alternative technologies to promote cuttings decontamination according to the law. The mixture of cuttings and fluid returning from the well goes through a set of separation equipments, called solids control systems, in order to recover the drilling fluid for reuse. The cuttings from the solids control system must be decontaminated before they can be discharged into the sea. Microwave heating has been studied over the past few years as an alternative to promote the decontamination of this waste and has been shown to be a promising technology. This work aimed to investigate fundamental aspects of microwave heating and drying of drilled cuttings. The heating curve of two different drilling fluids commonly employed in well-drilling operations was obtained. The kinetics of drying of cuttings contaminated with these drilling fluids was also investigated. It was evaluated the behavior of organic phase and water removal in the microwave drying process.

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