Finite element analysis of tooth load distribution on P-110S conic threaded connections

Chen, Shoujun; Li, Qiang; Zhang, Yi; An, Qi

doi:10.1016/j.ijpvp.2011.01.004

Cited by 19 publications

(9 citation statements)

References 15 publications

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“…As can be seen, the load distribution is non-uniform and the last engaged thread (flank 1) concentrated load and can be a fatigue cracking site if the connection is subjected to cyclic loading. The result of load distribution in the API Round connection was very similar to a previous numerical work 16 , in which the authors also found that the three first load flanks concentrates most of the load when an 9 5/8 in. P110 API Round connection was subjected to axial tensile stress.…”

Section: Resultssupporting

confidence: 87%

“…In this approach, an initial interference between the threads of pin and box as a function of make-up turns was solved by the software in a primary stage. Many researchers have shown that this approach results in a stress distribution over the threads close to that obtained in physical models 2,16,17 . The initial interference δ (or radial overlap) value was calculated by the Equation 1 16 , and the parameters were obtained for the API 5B standard.…”

Section: Introductionsupporting

confidence: 52%

See 1 more Smart Citation

Evaluation of Standard API Casing Connections and Parametric API Buttress Improvement by Finite Element Analysis

et al. 2016

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Threaded and coupled connections generally present a non-uniform stress distribution, which is related to the higher stiffness of the box when compared to the pin. The non-uniform stress distribution can contribute to fatigue cracks and other failure modes in high pressure oil wells. An API 5CT P110 steel obtained from a seamless pipe was mechanically characterized. FEA models were carried out to investigate and compare two API casing connections under make-up torque and tensile efforts. A parametric study was performed using numerical models to determine the influence of some geometric features on the behavior of the API Buttress threaded connection. The API Buttress connection supported higher tensile loads than the API Short Round, however both standard connections showed high stress concentration in the last engaged thread and a non-uniform stress distribution. The manufacturing of grooves at the first and the last engaged threads proved to be an efficient way to reduce the stress concentration of Buttress casing connection and could be an alternative to the development of new products.

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Section: Resultssupporting

confidence: 87%

Section: Introductionsupporting

confidence: 52%

Evaluation of Standard API Casing Connections and Parametric API Buttress Improvement by Finite Element Analysis

et al. 2016

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“…Interference between pin and box, δ, is calculated from Equation 1, where N is the number of turns, P is the pitch and T is the thread taper [21]: Slave and master surfaces define the interaction between pin and box in the threaded region. The contact algorithm restricts surface adhesion and penetration.…”

Section: Fe Modelling Assumptionsmentioning

confidence: 99%

Leakage Resistance Envelopes of API 8 Round Casing Connections using FE Analysis

Uribe

Carrazedo

Beck

2019

Lat. Am. j. solids struct.

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Leakage resistance of casing connections can be evaluated by extremely expensive testing procedures. Although testing is required for connection validation, significant amount of resources can be saved by complementing testing with Finite Element (FE) analysis. In this regard, a broadly accepted criterion to characterize leaks in FE simulation is still required. This paper proposes an objective and accurate criterion to characterize leakage resistance of casing connections in axisymmetric FE simulation. The criterion is based on stab flank contact pressures and stab flank engaged length parameters. The criterion is tested in application to API 8 Round LTC connections (5 ½ J55 14lb/ft), and confronted with test results. Leakage envelopes are obtained considering make-up torque and tensile axial loads. The influence of taper on connection sealability is also investigated. The long term goal of the investigation is to derive probabilistic leakage envelopes of casing connections considering manufacturing tolerances, effect of thermal cycles, and seal ovalization due to bending during assembly.

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“…Na Figura 5 pode-se observar o comportamento de uma conexão do tipo rosca-luva com filetes do tipo Buttress quando submetida a carregamento trativo. Devido à geometria cônica das regiões rosqueadas no tubo e na luva, durante a montagem da conexão há o surgimento de tensões que podem ultrapassar o limite de escoamento do material e que correspondem ao torque de montagem [14][15][16][17][18].Um dos principais objetivos de novos projetos de conexões é reduzir a concentração de tensão observada na região do último filete encaixado do tubo quando a conexão é submetida a carregamento trativo (Figura 5).…”

Section: Projeto De Conexões Octgunclassified

Tecnologia De Conexões Do Tipo Rosca-Luva Em Tubos Para Revestimento De Poços De Petróleo - Revisão

Porcaro¹,

Cândido²,

Trindade³

et al. 2019

ABM Proceedings

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Resumo Colunas de revestimento de poços de óleo e gás são submetidas a pressões e temperatura cada vez maiores, portanto necessitam de alta resistência mecânica e alta tenacidade. Os tubos que formam as colunas são unidos por conexões roscaluva, que são pontos críticos para a integridade estrutural. Geralmente empregam-se tubos sem costura especificados segundo a Norma API 5CT com modelos de conexões que atendem às especificações da Norma API 5B, no entanto, para exploração em condições severas e offshore, conexões premium ou proprietárias têm sido desenvolvidas por empresas privadas há mais de sessenta anos. Estas conexões são projetadas para aumentar a integridade estrutural em condições extremas, mantendo um mínimo de padronização exigido e, em alguns casos, são intercambiáveis com conexões padrão API. O presente trabalho apresenta e discute os modos de falhas mais recorrentes das conexões padronizadas e como se dá o desenvolvimento de novos produtos a partir de modificações nas geometrias básicas API. Estudos experimentais e de simulação numérica são apresentados em artigo homônimo. Palavras-chave:Conexões OCTG; Casing; API Buttress e API Short Round.

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Finite element analysis of tooth load distribution on P-110S conic threaded connections

Cited by 19 publications

References 15 publications

Evaluation of Standard API Casing Connections and Parametric API Buttress Improvement by Finite Element Analysis

Evaluation of Standard API Casing Connections and Parametric API Buttress Improvement by Finite Element Analysis

Leakage Resistance Envelopes of API 8 Round Casing Connections using FE Analysis

Tecnologia De Conexões Do Tipo Rosca-Luva Em Tubos Para Revestimento De Poços De Petróleo - Revisão

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