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João Otavio Leite Nunes - One of the best experts on this subject based on the ideXlab platform.
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Estudo do controle de poços em operações de perfuração em aguas profundas e ultra profundas
2017Co-Authors: João Otavio Leite NunesAbstract:Resumo: O controle de poço sempre foi um assunto muito importante na exploração e explotação de óleo e gás, pois envolve aspectos econômicos, de segurança de pessoas e questões ambientais. O avanço das explorações offshore, particularmente em águas profundas e ultra-profundas, tem aumentado cada vez mais a relevância do controle de kicks e prevenção de blowouts. Práticas de perfuração largamente utilizadas têm sido otimizadas e reavaliadas, então novas tecnologias têm sido desenvolvidas para tratar problemas relacionados a operações de perfuração em águas profundas, tal como uma prática de controle de poço confiável e eficiente. Este esforço é de grande importância em paises como o Brasil, que tem a maior parte da produção de óleo e gás em campos offshore, sendo que a maioria dos campos localiza-se em águas profundas e ultra-profundas. Considerando-se tal cenário, um modelo matemático foi desenvolvido para simular um kick de gás e prever a variação de pressão na linha do Choke e no espaço anular de um poço, durante uma situação de controle de poço em águas profundas. Considerações sobre o efeito da geometria do poço, perdas de carga por fricção, expansão do influxo e modelagem bifásica foram implementadas. O efeito de algumas variáveis no controle de poço, tais como o pit gain, lâmina d'água, densidade e reologia do fluido de perfuração e vazão de bombeio foram estudadasAbstract: Well control has always been a very important issue in the oi! and gas exploitation business, since it involves money savings, people safety and environment threatening. The advancement of the exploration frontiers from onshore to offshore fields, particularly, deep and ultra-deep waters, has increased even more the relevance of kick control and blowout prevention during drilling operations. Widely used drilling practices have been optimized and re-evaluated, so have new technologies been developed to handle specific issues related to deepwater drilling operations, such as reliable and efficient well control practices. This effort has great importance to some countries like Brazil, which have most part of their oil and gas production concentrated on offshore wells, about of those reserves are located in deepwaters. Regarding such scenario, a mathematical model has been developed to simulate a gas kick and predict the pressure variation in the Choke Line and the annular space of the well during well control situation in deepwater scenarios. Considerations regarding the effects of wellbore geometry, frictional pressure losses, influx expansion, and two-phase flow aspects have been implemented in the present model. The effects of some variables in well control, such as the pit gain, water depth, mud weight and rheology and pump flow rate have been studie
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Estudo do controle de poços em operações de perfuração em aguas profundas e ultra profundas
Universidade Estadual de Campinas. Instituto de Geociencias, 2002Co-Authors: João Otavio Leite NunesAbstract:O controle de poço sempre foi um assunto muito importante na exploração e explotação de óleo e gás, pois envolve aspectos econômicos, de segurança de pessoas e questões ambientais. O avanço das explorações offshore, particularmente em águas profundas e ultra-profundas, tem aumentado cada vez mais a relevância do controle de kicks e prevenção de blowouts. Práticas de perfuração largamente utilizadas têm sido otimizadas e reavaliadas, então novas tecnologias têm sido desenvolvidas para tratar problemas relacionados a operações de perfuração em águas profundas, tal como uma prática de controle de poço confiável e eficiente. Este esforço é de grande importância em paises como o Brasil, que tem a maior parte da produção de óleo e gás em campos offshore, sendo que a maioria dos campos localiza-se em águas profundas e ultra-profundas. Considerando-se tal cenário, um modelo matemático foi desenvolvido para simular um kick de gás e prever a variação de pressão na linha do Choke e no espaço anular de um poço, durante uma situação de controle de poço em águas profundas. Considerações sobre o efeito da geometria do poço, perdas de carga por fricção, expansão do influxo e modelagem bifásica foram implementadas. O efeito de algumas variáveis no controle de poço, tais como o pit gain, lâmina d'água, densidade e reologia do fluido de perfuração e vazão de bombeio foram estudadasWell control has always been a very important issue in the oi! and gas exploitation business, since it involves money savings, people safety and environment threatening. The advancement of the exploration frontiers from onshore to offshore fields, particularly, deep and ultra-deep waters, has increased even more the relevance of kick control and blowout prevention during drilling operations. Widely used drilling practices have been optimized and re-evaluated, so have new technologies been developed to handle specific issues related to deepwater drilling operations, such as reliable and efficient well control practices. This effort has great importance to some countries like Brazil, which have most part of their oil and gas production concentrated on offshore wells, about of those reserves are located in deepwaters. Regarding such scenario, a mathematical model has been developed to simulate a gas kick and predict the pressure variation in the Choke Line and the annular space of the well during well control situation in deepwater scenarios. Considerations regarding the effects of wellbore geometry, frictional pressure losses, influx expansion, and two-phase flow aspects have been implemented in the present model. The effects of some variables in well control, such as the pit gain, water depth, mud weight and rheology and pump flow rate have been studie
Nunes, João Otavio Leite - One of the best experts on this subject based on the ideXlab platform.
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Estudo do controle de poços em operações de perfuração em aguas profundas e ultra profundas
[s.n.], 2018Co-Authors: Nunes, João Otavio LeiteAbstract:Orientador: Paulo Roberto RibeiroDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica e Instituto de GeocienciasResumo: O controle de poço sempre foi um assunto muito importante na exploração e explotação de óleo e gás, pois envolve aspectos econômicos, de segurança de pessoas e questões ambientais. O avanço das explorações offshore, particularmente em águas profundas e ultra-profundas, tem aumentado cada vez mais a relevância do controle de kicks e prevenção de blowouts. Práticas de perfuração largamente utilizadas têm sido otimizadas e reavaliadas, então novas tecnologias têm sido desenvolvidas para tratar problemas relacionados a operações de perfuração em águas profundas, tal como uma prática de controle de poço confiável e eficiente. Este esforço é de grande importância em paises como o Brasil, que tem a maior parte da produção de óleo e gás em campos offshore, sendo que a maioria dos campos localiza-se em águas profundas e ultra-profundas. Considerando-se tal cenário, um modelo matemático foi desenvolvido para simular um kick de gás e prever a variação de pressão na linha do Choke e no espaço anular de um poço, durante uma situação de controle de poço em águas profundas. Considerações sobre o efeito da geometria do poço, perdas de carga por fricção, expansão do influxo e modelagem bifásica foram implementadas. O efeito de algumas variáveis no controle de poço, tais como o pit gain, lâmina d'água, densidade e reologia do fluido de perfuração e vazão de bombeio foram estudadasAbstract: Well control has always been a very important issue in the oi! and gas exploitation business, since it involves money savings, people safety and environment threatening. The advancement of the exploration frontiers from onshore to offshore fields, particularly, deep and ultra-deep waters, has increased even more the relevance of kick control and blowout prevention during drilling operations. Widely used drilling practices have been optimized and re-evaluated, so have new technologies been developed to handle specific issues related to deepwater drilling operations, such as reliable and efficient well control practices. This effort has great importance to some countries like Brazil, which have most part of their oil and gas production concentrated on offshore wells, about of those reserves are located in deepwaters. Regarding such scenario, a mathematical model has been developed to simulate a gas kick and predict the pressure variation in the Choke Line and the annular space of the well during well control situation in deepwater scenarios. Considerations regarding the effects of wellbore geometry, frictional pressure losses, influx expansion, and two-phase flow aspects have been implemented in the present model. The effects of some variables in well control, such as the pit gain, water depth, mud weight and rheology and pump flow rate have been studied.MestradoGeocienciasMestre em Ciências e Engenharia de Petróle
Haiqing Cheng - One of the best experts on this subject based on the ideXlab platform.
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prediction of gas hydrate formation region in the wellbore of deepwater drilling
Petroleum Exploration and Development, 2008Co-Authors: Haiqing ChengAbstract:Abstract It is essential to consider the thermodynamics, temperature, and pressure conditions of gas hydrate formation in order to predict the gas hydrate formation region in the wellbore of deepwater drilling. Multiphase flow governing equations (including continuity equation and momentum conservation equation), temperature field equations in annulus and drill pipe, and hydrate formation thermodynamics equation are established based on the characteristics of deepwater drilling. The definite conditions, discrete methods, and iterative steps are given to solve the equations under different working conditions. Through examples of calculation, the impacts of relevant parameters on gas hydrate formation region during drilling, off drilling, and well killing process are discussed. The result shows that the hydrate formation region is getting small when circulation volume becomes great, inhibitor concentration becomes high, downtime becomes short, or Choke Line size becomes large. And the result also indicates that it is more efficient to consider multifactors to suppress hydrate formation. The parameters can be optimized based on the method.
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Prediction of gas hydrate formation region in the wellbore of deepwater drilling
KeAi Communications Co. Ltd., 2008Co-Authors: Zhi-yuan Wang, Haiqing Cheng, Bao-jiang Sun, Yong-hai GaoAbstract:It is essential to consider the thermodynamics, temperature, and pressure conditions of gas hydrate formation in order to predict the gas hydrate formation region in the wellbore of deepwater drilling. Multiphase flow governing equations (including continuity equation and momentum conservation equation), temperature field equations in annulus and drill pipe, and hydrate formation thermodynamics equation are established based on the characteristics of deepwater drilling. The definite conditions, discrete methods, and iterative steps are given to solve the equations under different working conditions. Through examples of calculation, the impacts of relevant parameters on gas hydrate formation region during drilling, off drilling, and well killing process are discussed. The result shows that the hydrate formation region is getting small when circulation volume becomes great, inhibitor concentration becomes high, downtime becomes short, or Choke Line size becomes large. And the result also indicates that it is more efficient to consider multifactors to suppress hydrate formation. The parameters can be optimized based on the method. Key words: deepwater drilling, natural gas hydrate, multiphase flow governing equation, temperature field, thermodynamics equatio
Yammine A. - One of the best experts on this subject based on the ideXlab platform.
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Effect of Diffuser and Volute on Turbocharger Centrifugal Compressor Stability and Performance: Experimental Study Effet du diffuseur et de la volute sur la performance et la stabilité d’un compresseur centrifuge de suralimentation: étude expérimenta
EDP Sciences, 2011Co-Authors: Mohtar H., Chesse P., Chalet D., Hetet J.-f., Yammine A.Abstract:Engine downsizing is potentially one of the most effective strategies being explored to improve fuel economy. A main problem of downsizing using a turbocharger is the small range of stable functioning of the turbocharger centrifugal compressor at high boost pressures. Several techniques were studied to increase the compressor operating range without sacrificing the compressor efficiency. This paper presents the effect of delaying diffuser stability on the compressor performance and surge Line. Two different techniques were investigated, these are grooved and pinched diffuser. Moreover, the effect on retracting volute tongue on compressor performance is also studied. Pinched diffuser shifted surge Line to low flow rates, while dropping pressure through compressor. On the other hand, some interesting results were obtained when using grooved diffuser, these are pressure increase at high flow rates, and Choke Line shift to high flow rates. While retracting volute tongue was interesting in improving compressor efficiency, and pressure Lines at high speed. Le “downsizing” moteur est potentiellement l’une des stratégies les plus efficaces pour baisser la consommation carburant. Un problème majeur du “downsizing” à l’aide d’un turbocompresseur est la petite plage de fonctionnement stable du compresseur centrifuge à haute pression de suralimentation. Plusieurs techniques ont été étudiées pour augmenter la plage de fonctionnement du compresseur, sans sacrifier le rendement du compresseur. Cet article présente l’effet de la stabilisation du diffuseur sur la performance du compresseur et la ligne de pompage. Deux techniques différentes ont été étudiées, les sillons et le pincement diffuseur. De plus, l’effet de la diminution du bec de la volute sur les performances du compresseur a également été étudié. Le pincement du diffuseur a déplacé la ligne de pompage pour de faibles débits. Ce déplacement a été accompagné par une chute de pression et de rendement. Par ailleurs, des résultats intéressants ont été obtenus en utilisant un diffuseur avec des sillons, qui a permis d’augmenter la pression à débit élevé, et de déplacer la ligne de blocage vers le haut débit. Finalement, la modification du bec de la volute est intéressante dans l’amélioration de l’efficacité du compresseur et du taux de compression à grande vitesse
A. Yammine - One of the best experts on this subject based on the ideXlab platform.
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Effect of Diffuser and Volute on Turbocharger Centrifugal Compressor Stability and Performance: Experimental Study
Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles, 2011Co-Authors: H. Mohtar, Pascal Chesse, David Chalet, Jean-françois Hetet, A. YammineAbstract:Engine downsizing is potentially one of the most effective strategies being explored to improve fuel economy. A main problem of downsizing using a turbocharger is the small range of stable functioning of the turbocharger centrifugal compressor at high boost pressures. Several techniques were studied to increase the compressor operating range without sacrificing the compressor efficiency. This paper presents the effect of delaying diffuser stability on the compressor performance and surge Line. Two different techniques were investigated, these are grooved and pinched diffuser. Moreover, the effect on retracting volute tongue on compressor performance is also studied. Pinched diffuser shifted surge Line to low flow rates, while dropping pressure through compressor. On the other hand, some interesting results were obtained when using grooved diffuser, these are pressure increase at high flow rates, and Choke Line shift to high flow rates. While retracting volute tongue was interesting in improving compressor efficiency, and pressure Lines at high speed.