The Experts below are selected from a list of 1848 Experts worldwide ranked by ideXlab platform
M Izadi - One of the best experts on this subject based on the ideXlab platform.
-
investigating supercritical co 2 foam propagation distance conversion from strong foam to weak foam vs gravity segregation
Transport in Porous Media, 2020Co-Authors: M IzadiAbstract:This study investigates how to determine the optimal supercritical CO2 foam injection strategies, in terms of total injection rate (or injection pressure, equivalently) and injection foam quality, to place injected foams deep and far into the Reservoir. Two different mechanisms that limit field foam propagation, such as “conversion from strong foam to weak foam” and “gravity segregation,” are examined separately, and the results are combined together. The first is performed by using a mechanistic foam model based on bubble population balance, while the second is conducted by an analytical model (called Stone and Jenkins model) and Reservoir simulations with a commercial software (CMG-STARS). Note that the gas-phase mobility, required as a key input parameter for gravity segregation simulations, is calibrated by the mechanistic model, which is a significant advance in this study. The results from both mechanisms show in general that foam propagation distance increases with increasing injection pressure or rate (which is often limited by the formation fracturing pressure) and increases with decreasing foam quality down to a certain threshold foam quality below which the distance is not sensitive to foam quality any longer. It is found that the mobilization pressure gradient (i.e., the pressure gradient above which foam films are mobilized to create a population of bubbles) plays a key role to determine the distance. Therefore, the injection of supercritical CO2 foams with lower mobilization pressure gradient should be more favored in field applications. As a step prior to real-world Reservoir applications, this study deals with a relatively ideal Reservoir (i.e., large homogeneous Cylindrical Reservoir) focusing on the steady state after foam treatment in the absence of oil.
-
investigating supercritical co2 foam propagation distance conversion from strong foam to weak foam vs gravity segregation
Transport in Porous Media, 2020Co-Authors: M Izadi, Seung Ihl KamAbstract:This study investigates how to determine the optimal supercritical CO2 foam injection strategies, in terms of total injection rate (or injection pressure, equivalently) and injection foam quality, to place injected foams deep and far into the Reservoir. Two different mechanisms that limit field foam propagation, such as “conversion from strong foam to weak foam” and “gravity segregation,” are examined separately, and the results are combined together. The first is performed by using a mechanistic foam model based on bubble population balance, while the second is conducted by an analytical model (called Stone and Jenkins model) and Reservoir simulations with a commercial software (CMG-STARS). Note that the gas-phase mobility, required as a key input parameter for gravity segregation simulations, is calibrated by the mechanistic model, which is a significant advance in this study. The results from both mechanisms show in general that foam propagation distance increases with increasing injection pressure or rate (which is often limited by the formation fracturing pressure) and increases with decreasing foam quality down to a certain threshold foam quality below which the distance is not sensitive to foam quality any longer. It is found that the mobilization pressure gradient (i.e., the pressure gradient above which foam films are mobilized to create a population of bubbles) plays a key role to determine the distance. Therefore, the injection of supercritical CO2 foams with lower mobilization pressure gradient should be more favored in field applications. As a step prior to real-world Reservoir applications, this study deals with a relatively ideal Reservoir (i.e., large homogeneous Cylindrical Reservoir) focusing on the steady state after foam treatment in the absence of oil.
Marco Tulio De Carvalho Ferraz - One of the best experts on this subject based on the ideXlab platform.
-
Analise do comportamento de reservatorios submetidos a segregação gravitacional usando pseudo-funções
2014Co-Authors: Marco Tulio De Carvalho FerrazAbstract:Resumo: O objetivo deste trabalho é a análise do comportamento de um reservatório de gás em solução, submetido ao mecanismo de segregação gravitacional, durante a fase de recuperação primária. O sistema físico contempla a análise bidimensional de um reservatório cilíndrico, com o poço no centro, produzindo da porção inferior do mesmo. Foi analisado o fluxo de óleo e gás na presença de água conata imóvel. Efeitos capilares são desprezados e efeitos gravitacionais são considerados. O fluido pode ser descrito pelo modelo Beta. Resultados são gerados por um simulador comercial totalmente impléito. Essencialmente, este estudo é uma analogia dos trabalhos de Serra, Chen e Poston e Lima, com maior enfoque nos aspectos de segregação gravitacional. Aspectos do comportamento de reservatórios submetidos à segregação gravitacional, são mostrados, com análise acerca de alguns parâmetros que a controlam. Dentro de algumas limitações, o uso de pseudo-funções nas equações de fluxo multifásico, leva a formas lineares, análogas à solução do líquido de baixa compressibilidade e propriedades constantes. Fazendo uso destas definições e hipóteses acopladas às curvas tipo de Fetkovich, comparações são feitas quando da obtenção de parâmetros do reservatório, para as análises com e sem o uso das pseudo-funções. Os resultados obtidos mostram que o uso das pseudo-funções reduzem bastante as não linear idades presentes nas equações de fluxo multifásicoAbstract: The main purpose of this work is to study the behavior of a solution - gas Reservoir under a gas-cap drive during natural depletion. The physical system consists of a two-dimensional Cylindrical Reservoir, with a well at the center, producing from its lower portion. We consider the flow of oi! and gas in the presence of gravitacional effects. Capillary effects are negleted. Thé fluid behavior can be described by the Black-Oil model (13 - model). Results are generated from a commercial multipurpose Reservoir simulator. Essentially, this work is similar the ones developed by Serra, Chen and Poston and Lima, but with more emphasys to gravity segregation in two-dimensional flow. Aspects of the behavior of Reservoirs under gravity segregation are shown, with some analysis of the parameters which control the mecanism.Under certain conditions the use of pseudo-functions in the multiphase flow equations, give linear aspects similar to the solution of low compressibility liquid. Using these approaches and definitions and the type curve of Fetkovich, comparisions are made to obtaining Reservoirs parameters, with and without the use of pseudo- function
Ferraz, Marco Tulio De Carvalho - One of the best experts on this subject based on the ideXlab platform.
-
Analise do comportamento de reservatorios submetidos a segregação gravitacional usando pseudo-funções
[s.n.], 2018Co-Authors: Ferraz, Marco Tulio De CarvalhoAbstract:Orientadores: Kelsen Valente Serra, Fernando Rodriguez de la GarzaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia MecanicaResumo: O objetivo deste trabalho é a análise do comportamento de um reservatório de gás em solução, submetido ao mecanismo de segregação gravitacional, durante a fase de recuperação primária. O sistema físico contempla a análise bidimensional de um reservatório cilíndrico, com o poço no centro, produzindo da porção inferior do mesmo. Foi analisado o fluxo de óleo e gás na presença de água conata imóvel. Efeitos capilares são desprezados e efeitos gravitacionais são considerados. O fluido pode ser descrito pelo modelo Beta. Resultados são gerados por um simulador comercial totalmente impléito. Essencialmente, este estudo é uma analogia dos trabalhos de Serra, Chen e Poston e Lima, com maior enfoque nos aspectos de segregação gravitacional. Aspectos do comportamento de reservatórios submetidos à segregação gravitacional, são mostrados, com análise acerca de alguns parâmetros que a controlam. Dentro de algumas limitações, o uso de pseudo-funções nas equações de fluxo multifásico, leva a formas lineares, análogas à solução do líquido de baixa compressibilidade e propriedades constantes. Fazendo uso destas definições e hipóteses acopladas às curvas tipo de Fetkovich, comparações são feitas quando da obtenção de parâmetros do reservatório, para as análises com e sem o uso das pseudo-funções. Os resultados obtidos mostram que o uso das pseudo-funções reduzem bastante as não linear idades presentes nas equações de fluxo multifásicoAbstract: The main purpose of this work is to study the behavior of a solution ¿ gas Reservoir under a gas-cap drive during natural depletion. The physical system consists of a two-dimensional Cylindrical Reservoir, with a well at the center, producing from its lower portion. We consider the flow of oil and gas in the presence of gravitacional effects. Capillary effects are negleted. The fluid behavior can be described by the Black-Oil model (13 - model). Results are generated from a commercial multipurpose Reservoir simulator. Essentially, this work is similar the ones developed by Serra, Chen and Poston and Lima, but with more emphasys to gravity segregation in two-dimensional flow. Aspects of the behavior of Reservoirs under gravity segregation are shown, with some analysis of the parameters which control the mecanism.Under certain conditions the use of pseudo-functions in the multiphase flow equations, give linear aspects similar to the solution of low compressibility liquid. Using these approaches and definitions and the type curve of Fetkovich, comparisions are made to obtaining Reservoirs parameters, with and without the use of pseudo- functionsMestradoMestre em Engenharia de Petróle
Seung Ihl Kam - One of the best experts on this subject based on the ideXlab platform.
-
investigating supercritical co2 foam propagation distance conversion from strong foam to weak foam vs gravity segregation
Transport in Porous Media, 2020Co-Authors: M Izadi, Seung Ihl KamAbstract:This study investigates how to determine the optimal supercritical CO2 foam injection strategies, in terms of total injection rate (or injection pressure, equivalently) and injection foam quality, to place injected foams deep and far into the Reservoir. Two different mechanisms that limit field foam propagation, such as “conversion from strong foam to weak foam” and “gravity segregation,” are examined separately, and the results are combined together. The first is performed by using a mechanistic foam model based on bubble population balance, while the second is conducted by an analytical model (called Stone and Jenkins model) and Reservoir simulations with a commercial software (CMG-STARS). Note that the gas-phase mobility, required as a key input parameter for gravity segregation simulations, is calibrated by the mechanistic model, which is a significant advance in this study. The results from both mechanisms show in general that foam propagation distance increases with increasing injection pressure or rate (which is often limited by the formation fracturing pressure) and increases with decreasing foam quality down to a certain threshold foam quality below which the distance is not sensitive to foam quality any longer. It is found that the mobilization pressure gradient (i.e., the pressure gradient above which foam films are mobilized to create a population of bubbles) plays a key role to determine the distance. Therefore, the injection of supercritical CO2 foams with lower mobilization pressure gradient should be more favored in field applications. As a step prior to real-world Reservoir applications, this study deals with a relatively ideal Reservoir (i.e., large homogeneous Cylindrical Reservoir) focusing on the steady state after foam treatment in the absence of oil.
Howard A Stone - One of the best experts on this subject based on the ideXlab platform.
-
inertial gravity current produced by the drainage of a Cylindrical Reservoir from an outer or inner edge
Journal of Fluid Mechanics, 2019Co-Authors: Marius Ungarish, Lailai Zhu, Howard A StoneAbstract:We consider the time-dependent flow of a fluid of density $\unicode[STIX]{x1D70C}_{1}$ in a vertical Cylindrical container embedded in a fluid of density $\unicode[STIX]{x1D70C}_{2}~({<}\unicode[STIX]{x1D70C}_{1})$ whose side boundary is suddenly removed and the fluid drains freely from the edge. We show that in the inertial–buoyancy regime (large initial Reynolds number) the flow is modelled by the shallow-water equations and bears similarities to a gravity current released from a lock (the dam-break problem) driven by the reduced gravity $g^{\prime }=(1-\unicode[STIX]{x1D70C}_{2}/\unicode[STIX]{x1D70C}_{1})g$ . This formulation is amenable to an efficient finite-difference solution. Moreover, we demonstrate that similarity solutions exist, and show that the flow created by the dam break approaches the predicted self-similar behaviour when the volume ratio ${\mathcal{V}}(t)/{\mathcal{V}}(0)\approx 1/2$ where $t$ is time elapsed from the dam break. We considered two cases of drainage: (i) outward from the outer boundary in a full-radius Reservoir; and (ii) inward from the inner radius in an annular-shaped Reservoir. For the first case the similarity solution is expressed analytically, while the second case is more complicated and requires a numerical solution. In both cases ${\mathcal{V}}(t)/{\mathcal{V}}(0)$ decays like $t^{-2}$ , but the details are different. The similarity solutions admit an adjustable virtual-origin constant, which we determine by matching with the finite-difference solution. The analysis is valid for both Boussinesq and non-Boussinesq systems, and a wide range of geometric parameters (inner and outer radii, and height). The importance of the neglected viscous terms increases with time, and eventually the inertial–buoyancy model becomes invalid. An estimate for this occurrence is also provided. The predictions of the model are compared to results of direct numerical simulations; there is good agreement for the position of the interface and for the averaged radial velocity, and excellent agreement for ${\mathcal{V}}(t)/{\mathcal{V}}(0)$ . A box model is used for estimating the effect of a partial (over a sector) dam break. This study is an extension of the work for a rectangular Reservoir of Momen et al. ( J. Fluid Mech. , vol. 827, 2017, pp. 640–663). We demonstrate that there are some similarities, but also significant differences, between the rectangular and the Cylindrical Reservoirs concerning the velocity, shape of the interface and rate of drainage, which are of interest in applications. The overall conclusion is that this simple model captures very well the flow field under consideration.
