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Papers by Clovis R Maliska

Research paper thumbnail of Considerations about the internodal permeability evaluation in reservoir simulation, 2o Congresso Brasileiro de P&D em Petróleo & Gás, Rio de Janeiro

avaliação da permeabilidade nas interfaces dos volumes de controle durante a simulação de reserva... more avaliação da permeabilidade nas interfaces dos volumes de controle durante a simulação de reservatórios de petróleo e, depois, apresenta um método numérico que elimina esses problemas. O trabalho inicia realizando uma sucinta revisão bibliográfica e, na seqüência, apresenta a forma como as permeabilidades são interpretadas pelos simuladores comerciais. Neste contexto, são comentadas as implicações da utilização das médias harmônicas nos resultados das simulações numéricas. Finalmente, o método de volumes finitos baseado em elementos (EbFVM) é analisado, destacando a questão da avaliação das permeabilidades. Este método, além de permitir a utilização simultânea de elementos triangulares e quadriláteros, é muito adequado para o tratamento das permeabilidades. As duas possibilidades de armazenamento das propriedades físicas deste método e suas implicações na avaliação da permeabilidade são apresentadas. O armazenamento da permeabilidade nos elementos, em vez da prática usual de armazen...

Research paper thumbnail of Study of the Transmissibilities by Physical Similarity with Heat Transfer Problems

Resumo – Este trabalho apresenta um estudo das transmissibilidades, considerando apenas a influên... more Resumo – Este trabalho apresenta um estudo das transmissibilidades, considerando apenas a influência da geometria do reservatório de petróleo, através da similaridade física existente entre os fenômenos de transferência de massa em meios porosos e a transferência de calor. Inicialmente, a partir das equações de transporte, a transmissibilidade é definida, sendo na seqüência, apresentada a analogia entre as equações de transferência de calor e massa. Um problema bidimensional de transferência de calor, com solução analítica conhecida, é resolvido utilizandose quatro modelos diferentes de determinação de transmissibilidades. Pela comparação dos resultados, percebe-se que o modelo atualmente utilizado pelos simuladores comerciais, embora seja exato para problemas unidimensionais, não é o mais apropriado para problemas bidimensionais. Nestes casos recomenda-se a utilização do método que interpreta a malha como sendo a de Voronói.

Research paper thumbnail of Peaceman ’ S Well Model Evaluation for Non-Isolated and Partially Penetrating Wells

With the advance of the technology in the application of horizontal wells, skewed or with arbitra... more With the advance of the technology in the application of horizontal wells, skewed or with arbitrary trajectory, some authors have been developing methodologies in order to calculate an accurate well index, so that most of Peaceman’s model assumptions can be avoided. In these works, the mathematical formulation is more complex than the usual and the model is less restrictive. However, none of them show clearly the differences in the solutions that may exist between these recent models and the classical model when non-isolated and partially penetrating wells are employed. The objective of the present work is to evaluate Peaceman’s formulation in situations where three of its assumptions are violated, namely: isolated well, fully penetrating well and steady-state flow. Thus, the evaluation is done for partially penetrating wells near the boundaries and operating during the transient regime. For this purpose, a semi-analytical solution is obtained, based on Green’s function, and used as...

Research paper thumbnail of Clove hitch knot for scleral fixation of dislocated IOL – with temporary externalization of the haptics through a clear cornea incision

Investigative Ophthalmology & Visual Science, 2004

Research paper thumbnail of Correction to: Fundamentals of Computational Fluid Dynamics

Fluid mechanics and its applications, 2023

The original version of the chapter was published with incorrect symbol for the v-velocity in Cha... more The original version of the chapter was published with incorrect symbol for the v-velocity in Chapters 2, 5, 9, 10, 12 and 13, which has now been corrected. The book has been updated with the changes.

Research paper thumbnail of Avaliaςão de Modelos de Estimativa da Curvatura em Simulaςões Numéricas de Escoamentos Multifásicos

Mecánica Computacional, 2010

Research paper thumbnail of Mathematical Modelling and Numerical Simulation of the Well-reservoir Coupling Flow

ECMOR XIV - 14th European Conference on the Mathematics of Oil Recovery, Sep 8, 2014

ABSTRACT

Research paper thumbnail of Fundamentals of Computational Fluid Dynamics

Fluid mechanics and its applications, 2023

Research paper thumbnail of The Finite Volume Method

Fluid mechanics and its applications, 2023

Research paper thumbnail of Finding the Velocity Field—Pressure/Velocity Couplings

Fluid mechanics and its applications, 2023

Research paper thumbnail of Pressure Instabilities: From Navier–Stokes to Poroelasticity

Fluid mechanics and its applications, 2023

Research paper thumbnail of A Performance Assessment of P-V Coupling Techniques for Solving Incompressible Flows on Colocated Unstructured Grids

Research paper thumbnail of Calculating three-dimensional fluid flows using nonorthogonal grids

Numerical Methods in Laminar and Turbulent Flow, 1983

Research paper thumbnail of Three-Dimensional Advection/Diffusion of <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow></mrow><annotation encoding="application/x-tex"></annotation></semantics></math></span><span class="katex-html" aria-hidden="true"></span></span>\phi$$

Fluid mechanics and its applications, 2023

Research paper thumbnail of Conservation Equations—Physical and Mathematical Aspects

Fluid mechanics and its applications, 2023

Research paper thumbnail of Introducing General Grids Discretization

Fluid mechanics and its applications, 2023

Research paper thumbnail of Coordinate Transformation—General Curvilinear Coordinate Systems

Fluid mechanics and its applications, 2023

Research paper thumbnail of Advection and Diffusion—Interpolation Functions

Fluid mechanics and its applications, 2023

Research paper thumbnail of General Recommendations for Conceiving and Testing Your Code

Fluid mechanics and its applications, 2023

Research paper thumbnail of Reservoir and Well Coupling Simulation with Distributed Algorithm

Brazilian Journal of Petroleum and Gas, Jan 6, 2016

A major goal when using a horizontal well is to increase the productivity rate when compared to t... more A major goal when using a horizontal well is to increase the productivity rate when compared to the vertical layout, due to a larger area of the reservoir exposed to the well. The coupled solution into the reservoir and through the well requires finding the answer to the Darcy equation in the reservoir and the Navier-Stokes equations in the well. Additionally, several types of completion, which introduce new flow resistances, such as completions with inflow control device (ICD), stinger completion, packed off, gravel pack, and slotted liner are considered. All these details are not available with the current reservoir simulators, since the level of local detail would require a very large computational time and a complex model. In this work, the coupling between the reservoir and the well is accomplished through a distributed system, where the flow, at various types of completion, is handled through correlations obtained analytically or provided by completion equipment manufacturers. The proposed procedure consists of a fast tool, accurate and easy to use for a petroleum engineer. The results of this work show that the distributed system allows a detailed view of the flow into the well and its completion, quantifying the flow rate and pressure over the annular and liner for different types of completion, adding more physics into these simulations.

Research paper thumbnail of Considerations about the internodal permeability evaluation in reservoir simulation, 2o Congresso Brasileiro de P&D em Petróleo & Gás, Rio de Janeiro

avaliação da permeabilidade nas interfaces dos volumes de controle durante a simulação de reserva... more avaliação da permeabilidade nas interfaces dos volumes de controle durante a simulação de reservatórios de petróleo e, depois, apresenta um método numérico que elimina esses problemas. O trabalho inicia realizando uma sucinta revisão bibliográfica e, na seqüência, apresenta a forma como as permeabilidades são interpretadas pelos simuladores comerciais. Neste contexto, são comentadas as implicações da utilização das médias harmônicas nos resultados das simulações numéricas. Finalmente, o método de volumes finitos baseado em elementos (EbFVM) é analisado, destacando a questão da avaliação das permeabilidades. Este método, além de permitir a utilização simultânea de elementos triangulares e quadriláteros, é muito adequado para o tratamento das permeabilidades. As duas possibilidades de armazenamento das propriedades físicas deste método e suas implicações na avaliação da permeabilidade são apresentadas. O armazenamento da permeabilidade nos elementos, em vez da prática usual de armazen...

Research paper thumbnail of Study of the Transmissibilities by Physical Similarity with Heat Transfer Problems

Resumo – Este trabalho apresenta um estudo das transmissibilidades, considerando apenas a influên... more Resumo – Este trabalho apresenta um estudo das transmissibilidades, considerando apenas a influência da geometria do reservatório de petróleo, através da similaridade física existente entre os fenômenos de transferência de massa em meios porosos e a transferência de calor. Inicialmente, a partir das equações de transporte, a transmissibilidade é definida, sendo na seqüência, apresentada a analogia entre as equações de transferência de calor e massa. Um problema bidimensional de transferência de calor, com solução analítica conhecida, é resolvido utilizandose quatro modelos diferentes de determinação de transmissibilidades. Pela comparação dos resultados, percebe-se que o modelo atualmente utilizado pelos simuladores comerciais, embora seja exato para problemas unidimensionais, não é o mais apropriado para problemas bidimensionais. Nestes casos recomenda-se a utilização do método que interpreta a malha como sendo a de Voronói.

Research paper thumbnail of Peaceman ’ S Well Model Evaluation for Non-Isolated and Partially Penetrating Wells

With the advance of the technology in the application of horizontal wells, skewed or with arbitra... more With the advance of the technology in the application of horizontal wells, skewed or with arbitrary trajectory, some authors have been developing methodologies in order to calculate an accurate well index, so that most of Peaceman’s model assumptions can be avoided. In these works, the mathematical formulation is more complex than the usual and the model is less restrictive. However, none of them show clearly the differences in the solutions that may exist between these recent models and the classical model when non-isolated and partially penetrating wells are employed. The objective of the present work is to evaluate Peaceman’s formulation in situations where three of its assumptions are violated, namely: isolated well, fully penetrating well and steady-state flow. Thus, the evaluation is done for partially penetrating wells near the boundaries and operating during the transient regime. For this purpose, a semi-analytical solution is obtained, based on Green’s function, and used as...

Research paper thumbnail of Clove hitch knot for scleral fixation of dislocated IOL – with temporary externalization of the haptics through a clear cornea incision

Investigative Ophthalmology & Visual Science, 2004

Research paper thumbnail of Correction to: Fundamentals of Computational Fluid Dynamics

Fluid mechanics and its applications, 2023

The original version of the chapter was published with incorrect symbol for the v-velocity in Cha... more The original version of the chapter was published with incorrect symbol for the v-velocity in Chapters 2, 5, 9, 10, 12 and 13, which has now been corrected. The book has been updated with the changes.

Research paper thumbnail of Avaliaςão de Modelos de Estimativa da Curvatura em Simulaςões Numéricas de Escoamentos Multifásicos

Mecánica Computacional, 2010

Research paper thumbnail of Mathematical Modelling and Numerical Simulation of the Well-reservoir Coupling Flow

ECMOR XIV - 14th European Conference on the Mathematics of Oil Recovery, Sep 8, 2014

ABSTRACT

Research paper thumbnail of Fundamentals of Computational Fluid Dynamics

Fluid mechanics and its applications, 2023

Research paper thumbnail of The Finite Volume Method

Fluid mechanics and its applications, 2023

Research paper thumbnail of Finding the Velocity Field—Pressure/Velocity Couplings

Fluid mechanics and its applications, 2023

Research paper thumbnail of Pressure Instabilities: From Navier–Stokes to Poroelasticity

Fluid mechanics and its applications, 2023

Research paper thumbnail of A Performance Assessment of P-V Coupling Techniques for Solving Incompressible Flows on Colocated Unstructured Grids

Research paper thumbnail of Calculating three-dimensional fluid flows using nonorthogonal grids

Numerical Methods in Laminar and Turbulent Flow, 1983

Research paper thumbnail of Three-Dimensional Advection/Diffusion of <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow></mrow><annotation encoding="application/x-tex"></annotation></semantics></math></span><span class="katex-html" aria-hidden="true"></span></span>\phi$$

Fluid mechanics and its applications, 2023

Research paper thumbnail of Conservation Equations—Physical and Mathematical Aspects

Fluid mechanics and its applications, 2023

Research paper thumbnail of Introducing General Grids Discretization

Fluid mechanics and its applications, 2023

Research paper thumbnail of Coordinate Transformation—General Curvilinear Coordinate Systems

Fluid mechanics and its applications, 2023

Research paper thumbnail of Advection and Diffusion—Interpolation Functions

Fluid mechanics and its applications, 2023

Research paper thumbnail of General Recommendations for Conceiving and Testing Your Code

Fluid mechanics and its applications, 2023

Research paper thumbnail of Reservoir and Well Coupling Simulation with Distributed Algorithm

Brazilian Journal of Petroleum and Gas, Jan 6, 2016

A major goal when using a horizontal well is to increase the productivity rate when compared to t... more A major goal when using a horizontal well is to increase the productivity rate when compared to the vertical layout, due to a larger area of the reservoir exposed to the well. The coupled solution into the reservoir and through the well requires finding the answer to the Darcy equation in the reservoir and the Navier-Stokes equations in the well. Additionally, several types of completion, which introduce new flow resistances, such as completions with inflow control device (ICD), stinger completion, packed off, gravel pack, and slotted liner are considered. All these details are not available with the current reservoir simulators, since the level of local detail would require a very large computational time and a complex model. In this work, the coupling between the reservoir and the well is accomplished through a distributed system, where the flow, at various types of completion, is handled through correlations obtained analytically or provided by completion equipment manufacturers. The proposed procedure consists of a fast tool, accurate and easy to use for a petroleum engineer. The results of this work show that the distributed system allows a detailed view of the flow into the well and its completion, quantifying the flow rate and pressure over the annular and liner for different types of completion, adding more physics into these simulations.