A Multiphysics Model for Assessing Casing Integrity in Sour Service Applications
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Abstract Structural integrity assessments are vital for ensuring the safety and efficiency of oil and gas wells, especially in sour service applications. The casings used in drilling operations are critical as mechanical barriers against leaks among different well-construction components. However, their susceptibility to environment-assisted crack growth, like sulfide stress cracking (SSC), presents challenges for casing mechanical integrity management. Conventional analytical methods are quick but can be overly conservative in material selection. Recently, multiphysics modelling of fracture has emerged as an accurate simulation approach, leveraging tools such as hydrogen diffusion models, fracture mechanics, and finite element analysis. In this work, a coupled deformation-diffusion phase-field finite element framework is used to model SSC nucleation and growth in a sour environment. The multiphysics model employs coupling between structural deformation, hydrogen diffusion due to H2S exposure, and fracture processes to simulate SSC. The numerical results show good agreement with the experimental data for different levels of H2S exposure. A numerical study is also conducted to study SSC nucleation and growth in pre-notched mini-pipe subjected to internal pressure and H2S exposure. The findings of this investigation provide valuable insights into the effectiveness of a coupled phase-field approach to study the combined role of stresses and through-wall hydrogen gradients on pipe failure.Keywords:
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The paper deals with modeling and simulation of the heat exchanger by means of finite difference method (FDM) and finite element method (FEM) in C# and Comsol Multiphysics environments. It refers to previously published papers on this problematic while introducing new approaches. The paper brings a short introduction of solution of above mentioned particular approaches in Comsol Multiphysics and C#.
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With point electric source as example, this paper describes direct current method forward modeling with COMSOL Multiphysics. By comparing and analyzing COMSOL Multiphysics modeling results and theoretic values of typical models, the validity and feasibility of direct current method forward modeling based on COMSOL Multiphysics is proved. Due to the powerful mesh dissection, solution function and abundant post process operation, it shows an important significance of applying COMSOL Multiphysics in geophysical modeling.
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У статті наводиться огляд проблем, що зустрічаються при моделюванні механічних процесів. Так само проведено аналіз застосування модуля «Механіка конструкцій» в програмному середовищі COMSOL Multiphysics для вирішення механічних завдань на прикладі моделі яка представляє собою тонкий металевий лист, який вдавлюється в штамп за допомогою пуансона. При прокаті листового металу явище деформації – є важливим етапом в технологічному процесі. Тому в роботі показана можливість застосування моделювання механічних процесів, як можливість проводити експериментальні дослідження за допомогою COMSOL Multiphysics. Також в роботі поведено аналіз літературних джерел, в яких розглядається питання моделювання механічних і фізичних процесів не тільки в програмному середовищі COMSOL Multiphysics., але і в інших програмних продуктах.
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An advanced Neuro-space mapping (Neuro-SM) multiphysics parametric modeling approach for microwave passive components is proposed in this paper. The electromagnetic (EM) domain model, which represents the EM responses with respect to geometrical parameters, is regarded as a coarse model. The multiphysics domain model, which represents the multiphysics responses with respect to both geometrical parameters and multiphysics parameters, is regarded as a fine model. The proposed model is constructed by the input mapping, the output mapping and the coarse model. The input mapping is used to map multiphysics parameters to EM parameters. The output mapping is introduced to further narrow the gap between the output of the coarse model and the multiphysics data. In addition, a three-stage training method is proposed for efficiently developing the proposed multiphysics model. The proposed technique, which combines the efficiency of EM analysis and the accuracy of multiphysics analysis, can achieve better accuracy with less multiphysics data than existing modeling methods. The developed Neuro-SM multiphysics model provides accurate and fast predictions of multiphysics responses. Therefore, the design cycle of microwave passive components is shortened while the modeling cost is significantly reduced. Two microwave filter examples are utilized to demonstrate the accuracy of the proposed parametric modeling technique.
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Создана математическая модель взаимодействия многолетнемерзлого грунта и трубопровода в программном комплексе Comsol Multiphysics 4.3b. Проведен анализ исходных данных для моделирования. Сделано заключение о том, что граничные условия третьего рода на поверхности грунта зависят от времени. Обозначены основные требования, предъявляемые к регрессионной модели, описывающей граничные условия на поверхности грунта. Разработана методика аппроксимации исходных данных рядами Фурье. Определено оптимальное число слагаемых в ряду Фурье, обеспечивающее плавное изменение аппроксимируемой величины при переходе от одного месяца к другому. При помощи инструментов пакета Matlab с интегрированным языком символьного исчисления MuPad сформировано выражение, задающее граничные условия в Comsol Multiphysics 4.3b. Выполнена проверка соответствия использованных символьных обозначений функций и переменных смысловому содержанию тех же символьных обозначений в интерпретируемом языке Comsol Multiphysics 4.3b.
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With point electric source and line electric source as example,the paper introduces in detail the process of carrying out DC forward modeling with COMSOL MULTIPHYSICS.By comparing and analyzing COMSOL MULTIPHYSICS modeling result and theoretic value of typical model,the validity and feasibility of DC method forward modeling based on COMSOL MULTIPHYSICS are proved.Due to the powerful mesh dissection,solution function and abundant post process operation,it has important significance to apply COMSOL MULTIPHYSICS in geophysical modeling.
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The total number of casing deformation wells in Shengli oil field has reached 2539 at the end of 2002 since Shengli oil field entered into comprehensive production in 1970, which greatly restricted its development. The casing deformation types mainly include casing deformation and casing breakage. The casing deformation mechanism includes bed glide and mudstone creepage which cause casing deformation or breakage under uneven ground stress. Aiming at the cause of casing deformation and breakage, the correspondingly preventive action was made. One is to prevent extraneous force from exceeding casing yield strength,the other is to augment casing strength. Obvious anti-deformation effect is obtained with the application of actions.
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Multiphysics modeling and simulation have a wide range of application in science and engineering. This paper discusses some challenges for computational electromagnetics in the modeling and simulation of multiphysics problems that involve the interaction between electromagnetic fields and other physical phenomena.
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