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Article
Publication date: 1 December 1996

J.R. Weatherby, D.E. Munson and J.G. Argüello

Describes a set of numerical techniques which implement the rate‐dependent multi‐mechanism deformation (M‐D) constitutive model for rock salt in a finite element code for use in…

313

Abstract

Describes a set of numerical techniques which implement the rate‐dependent multi‐mechanism deformation (M‐D) constitutive model for rock salt in a finite element code for use in three‐dimensional, finite strain simulations of creep closure in deeply buried salt excavations. Presents essential details of the numerical implementation. The constitutive model is exercised in a three‐dimensional closure simulation of a large underground field experiment. Compares results from the simulation against actual closure measurements taken from the experiment.

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Engineering Computations, vol. 13 no. 8
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 6 July 2015

William Wagner Matos Lira, Giancarlo de Gusmão Gonçalves, Catarina Nogueira Araujo, Adeildo Soares Ramos Junior and Alejandro César Frery

– The purpose of this paper is to present an analysis of the effect of the temperature on the creep deformation during vertical well drilling in salt rocks in selected cases.

183

Abstract

Purpose

The purpose of this paper is to present an analysis of the effect of the temperature on the creep deformation during vertical well drilling in salt rocks in selected cases.

Design/methodology/approach

The authors performed numerical simulations by Finite Element Method, using non-linear viscoelastic models and weak thermomechanical coupling. The authors evaluated, in selected cases, the effect of temperature during salt rock vertical well drilling. Numerical examples were performed to validate the studies. More specifically, the authors considered the problem of vertical well drilling for oil exploration below these salt layers.

Findings

The authors concluded that the biggest reduction in the wellbore closure rate occurs when the wellbore is at low temperature with respect to the rock initial. This is due to two factors, namely, a reduced salt viscous strain rate and the thermal strain contrary to the well radial closure caused by the temperature variation. Beyond the creep effect, the thermal strain also affects the stress in the creep constitutive equation.

Practical implications

With recent oil discoveries in deep water, for example, in the pre-salt, where temperatures are high, the study of the influence of temperature is important, since it contributes to the increase of the creep. The results here presented are relevant, although the engineering aspects of a practical solution for reducing the wellbore displacement based on temperature variation is challenging. Such approach requires cooling mechanisms that delay the heating of the drilling fluid, which is surrounded by rocks at high temperature.

Originality/value

The main contribution of this paper is to present a numerical study, in selected cases, of the effect of temperature on the creep deformation during vertical well drilling in salt rocks, analyzing a possible reduction of these deformations when subjected to a temperature variation.

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Engineering Computations, vol. 32 no. 5
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 1 April 1992

J. Barton Cunningham

Suggests that successful managers develop practical theories orframeworks to guide their decision making and problem solving. Describeshow managers developed a framework for…

495

Abstract

Suggests that successful managers develop practical theories or frameworks to guide their decision making and problem solving. Describes how managers developed a framework for focusing performance appraisal, training and career development opportunities in a long‐term care hospital.

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Leadership & Organization Development Journal, vol. 13 no. 4
Type: Research Article
ISSN: 0143-7739

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Article
Publication date: 1 August 2001

Jaroslav Mackerle

Gives a bibliographical review of the error estimates and adaptive finite element methods from the theoretical as well as the application point of view. The bibliography at the…

1686

Abstract

Gives a bibliographical review of the error estimates and adaptive finite element methods from the theoretical as well as the application point of view. The bibliography at the end contains 2,177 references to papers, conference proceedings and theses/dissertations dealing with the subjects that were published in 1990‐2000.

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Engineering Computations, vol. 18 no. 5/6
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 1 December 2001

Jaroslav Mackerle

Gives a bibliographical review of the finite element meshing and remeshing from the theoretical as well as practical points of view. Topics such as adaptive techniques for meshing…

1907

Abstract

Gives a bibliographical review of the finite element meshing and remeshing from the theoretical as well as practical points of view. Topics such as adaptive techniques for meshing and remeshing, parallel processing in the finite element modelling, etc. are also included. The bibliography at the end of this paper contains 1,727 references to papers, conference proceedings and theses/dissertations dealing with presented subjects that were published between 1990 and 2001.

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Engineering Computations, vol. 18 no. 8
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 1 October 2002

J. Barton Cunningham, Philip Gerrard, Herbert Schoch and Chung Lai Hong

Managers and entrepreneurs are increasingly being challenged to respond to a world where it is harder to effectively make and implement their decisions. Over half the decisions…

1568

Abstract

Managers and entrepreneurs are increasingly being challenged to respond to a world where it is harder to effectively make and implement their decisions. Over half the decisions managers make are never implemented. We have observed entrepreneurs and managers in a wide range of situations in various countries, who illustrate a different set of assumptions for making decisions. They illustrate an entrepreneurial logic, a process of creatively defining and taking action to make sense out of situations which require new frameworks, assumptions and understandings. They assume that many challenges are not predictable and controllable. Certain control‐oriented attitudes and behaviors inhibit people from thinking this way, such as attempts to make decisions without fully understanding the right question, and overly relying on statistics. Certain reframing attitudes and behaviors – diversity in thinking, asking the right questions, and reframing and adapting quickly – illustrate ways to make sense of the paradoxes and uncertainties in the new economy.

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Management Decision, vol. 40 no. 8
Type: Research Article
ISSN: 0025-1747

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Article
Publication date: 1 May 2002

David C. Bell, John S. Atkinson and Victoria Mosier

Describes how HIV and AIDS are carried and spread, particularly for high‐risk groups, but adds that it is not only behavioural but also those behaviours in conjunction with…

263

Abstract

Describes how HIV and AIDS are carried and spread, particularly for high‐risk groups, but adds that it is not only behavioural but also those behaviours in conjunction with others. Employs figures and tables for added explanation and emphasis. Chronicles some individual case studies showing different “risk” behaviours and types of “unsafe” practices. Makes clear that the use of varied types of education are of major importance in the fight against ignorance and nonchalance in the battle against AIDS.

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International Journal of Sociology and Social Policy, vol. 22 no. 4/5/6
Type: Research Article
ISSN: 0144-333X

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Available. Content available
Book part
Publication date: 14 September 2018

Abstract

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Authenticity & Tourism
Type: Book
ISBN: 978-1-78754-817-6

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Book part
Publication date: 10 May 2017

Dara E. Purvis

In recent years, school districts have faced numerous questions surrounding accommodations of transgender students. Strong objections to accommodations have been voiced in public…

Abstract

In recent years, school districts have faced numerous questions surrounding accommodations of transgender students. Strong objections to accommodations have been voiced in public argument and litigation, primarily in the areas of athletics, bathrooms, and dress codes. As younger transgender students express their gender identity at school, however, the existing objections are weakened by considering the context of elementary rather than high school students. Greater numbers of young transgender students will likely encourage accommodation of trans students of all ages, as well as challenge the gender binary unconsciously taught in school.

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Studies in Law, Politics, and Society
Type: Book
ISBN: 978-1-78714-344-9

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Book part
Publication date: 26 November 2020

Christopher W. J. Steele and Timothy R. Hannigan

Talk of “macrofoundations” helps foreground the constitutive and contextualizing powers of institutions – dynamics that are inadvertently obscured by the imagery of…

Abstract

Talk of “macrofoundations” helps foreground the constitutive and contextualizing powers of institutions – dynamics that are inadvertently obscured by the imagery of microfoundations. Highlighting these aspects of institutions in turn opens intriguing lines of inquiry into institutional reproduction and change, lived experience of institutions, and tectonic shifts in institutional configurations. However, there is a twist: taking these themes seriously ultimately challenges any naïve division of micro and macro, and undermines the claim of either to a genuinely foundational role in social analysis. The authors propose an alternative “optometric” imagery – positioning the micro and the macro as arrays of associated lenses, which bring certain things into focus at the cost of others. The authors argue that this imagery should not only encourage analytic reflexivity (“a more optometric institutionalism”) but also draw attention to the use of such lenses in everyday life, as an underexplored but critical phenomenon for institutional theory and research (“an institutionalist optometry”).

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Macrofoundations: Exploring the Institutionally Situated Nature of Activity
Type: Book
ISBN: 978-1-83909-160-5

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