1,720,962 research outputs found
Decision-making Tool For Knowledge-based Projects In Offshore Production Systems
No full textThe development of an offshore field demands knowledge of many experts to choose the different components of an offshore production system. All the specialized parts of this knowledge are intrinsically related. The aim of this paper is to use Fuzzy Sets and knowledge-based systems to describe and formalize the phases of development of an offshore production system project, in order to share and to manage the required knowledge for carrying out a project, while at the same time proposing alternatives for the oil field configuration. © Springer-Verlag Berlin Heidelberg 2012.7637 LNAI692701et al.,Sociedad Colombiana de Computacion (SCo2),Universidad de Caldas,Universidad Nacional de Colombia,Universidad Tecnologica de Bolivar en Cartagena,Universidad Tecnologica de PereiraPublisher: Springer VerlagWang, X., Chan, C.W., Hamilton, H.J., Design of knowledge-based systems with the ontology-domain-system approach (2002) 14th International Conference on Software Engineering and Knowledge Engineering, pp. 233-236. , Ischia, Italy, July 15-19Bargach, S., Martin, C.A., Smith, R.G., Managing drilling knowledge for improved efficiency and reduced operational risk (2001) SPE/IADC Drilling Conference, p. 67821Chao, K.M., Smith, P., Hills, W., Florida-James, B., Norman, P., Knowledge sharing and reuse for engineering design integration (1998) Expert Systems with App., 14 (3), pp. 399-408Soh, C.K., Soh, A.K., An approach to automate the design of fixed offshore platforms (1993) Computers & Structures, 46 (4), pp. 221-254Franco, K.P.M., Morooka, C.K., Mendes, J.R.P., Guilherme, I.R., Desenvolvimento de um sistema inteligente para auxiliar a escolha de sistema para produção no mar (2002) 2o Congresso Brasileiro de P&D em Petróleo & Gás, Rio de Janeiro, , in portugueseSerapião, A.B.S., Guilherme, I.R., Morooka, C.K., Mendes, J.R.P., Franco, K.P.M., Um sistema inteligente para escolha dentre alternativas de sistemas marítimos de produção (2003) VI Simpósio Brasileiro de Inte Ligência Artificial, Bauru-SP, , Brazil In PortugueseKlir, G.J., Yuan, B., (1995) Fuzzy Sets and Fuzzy Logic-Theory and Applications, , 1st edn Prentice-Hal
Artificial Immune Systems For Classification Of Petroleum Well Drilling Operations
No full textThis paper presents two approaches of Artificial Immune System for Pattern Recognition (CLONALG and Parallel AIRS2) to classify automatically the well drilling operation stages. The classification is carried out through the analysis of some mud-logging parameters. In order to validate the performance of AIS techniques, the results were compared with others classification methods: neural network, support vector machine and lazy learning. © Springer-Verlag Berlin Heidelberg 2007.4628 LNCS4758Unneland, T., Hauser, M., Real-Time Asset Management: From Vision to Engagement-An Operator's Experience (2005) Proc. SPE Annual Technical Conference and Exhibition, , Dallas, USAYue, Z.Q., Lee, C.F., Law, K., Tham, L.G., Automatic monitoring of rotary-percussive drilling for ground characterization - illustrated by a case example in Hong Kong (2003) International Journal of Rock Mechanics & Mining Sciences, 41, pp. 573-612de Castro, L., Timmis, J., (2002) Artificial immune systems: A new computational approach, , Springer, London. UKde Castro, L.N., Von Zuben, F.J., The Clonal Selection Algorithm with Engineering Applications (2000) Proceedings of the Genetic and Evolutionary Computation Conference (GECCO '00), Workshop on Artificial Immune Systems and Their Applications, pp. 36-37. , Whitley, L.D, Goldberg, D.E, Cantú-Paz, E, Spector, L, Parmee, I.C, Beyer, H.-G, eds, Morgan Kaufmann, Las Vegas, Nevada, USAde Castro, L.N., Von Zuben, F.J., Learning and optimization using the clonal selection principle (2002) IEEE Transactions on Evolutionary Computation, 6 (3), pp. 239-251Watkins, A., Boggess, L., A new classifier based on resource limited Artificial Immune Systems (2002) Proc. 2002 Congress on Evolutionary Computation (CEC2002), , Honolulu, Hawaii. IEEE Press, New YorkWatkins, A., Timmis, J., Boggess, L., Artificial Immune Recognition System (AIRS): An Immune-Inspired Supervised Learning Algorithm (2004) Genetic Programming and Evolvable Machines, 5 (3), pp. 291-317Watkins, A., Timmis, J., Artificial Immune Recognition System (AIRS): Revisions and Refinements (2002) Proc. of 1st International Conference on Artificial Immune Systems (ICARIS2002), pp. 173-181. , Timmis, J, Bentley, P.J, eds, University of Kent at CanterburyWatkins, A., Timmis, J.: Exploiting Parallelism Inherent in AIRS, an Artificial Immune Classifier. In: Nicosia, G., Cutello, V., Bentley, P.J., Timmis, J. (eds.) ICARIS 2004. LNCS, 3239, pp. 427-438. Springer, Heidelberg (2004)Tavares, R.M., Mendes, J.R.P., Morooka, C.K., Plácido, J.C.R., Automated Classification System for Petroleum Well Drilling using Mud-Logging Data (2005) Proc. of 18th International Congress of Mechanical Engineer.Offshore & Petroleum and Engineering, , Ouro Preto, BrazilSerapião, A.B.S., Tavares, R.M., Mendes, J.R.P., Morooka, C.K., Classificação automática da operação de perfuração de poços de petróleo através de redes neurais (2005) Proc. of VII Brazilian Symposium on Intelligent Automation (SBAI), , São Luís-MA, BrazilSerapião, A.B.S., Tavares, R.M., Mendes, J.R.P., Guilherme, I.R., Classification of Petroleum Wells Drilling Operations Using Support Vectors Machine (SVM) (2006) Proc. of International Conference on Computational Intelligence for Modelling, Control and Automation (CIMCA'2006), , IEEE Computer Society, Sydney, AustraliaAtkeson, C.G., Moore, A.W., Schaal, S., Locally weighted learning (1997) Artificial Intelligence Review, 11 (1-5), pp. 11-73Kyllingstad, A., Horpestad, J.L., Klakegg, S., Kristiansen, A., Aadnoy, B.S., Factors Limiting the Quantitative Use of Mud-Logging Data (1993) Proc. of the SPE Asia Pacific Oil and Gas Conference, , SingaporeAda, G.L., Nossal, G.J.V., The Clonal Selection Theory (1987) Scientific American, 257 (2), pp. 50-57Berek, C., Ziegner, M., The Maturation of the Immune Response (1993) Imm. Today, 14 (8), pp. 400-40
Evaluation Of Numerical Methods Applied In The Analysis Of The Transient Flow Of Pipeline Systems
No full textBrazilian subsea exploration is increasing specially after the post salt petroleum field discovery. Several challenges have been imposed for the production of those fields. In this scenery, the transport of oil and gas from the production field to the continent is a problem, especially when the fields are located at a great distance from the coast. A possible solution could be the use of subsea pipeline systems, for the transportation of the fluids produced from the petroleum wells. For the pipeline system design it is highly recommended the evaluation of the transient flow, considering the water hammer phenomenon. The definition for this phenomenon is given by the pressure variation due to operation singularities in the pipe system. The disruption in the flow originated by the operation of valves or failure of a pump can be listed as some of the main causes of the water hammer. The basic equations to model the water hammer in fluid mechanics comes from two partial differential equations, the equation of continuity and momentum. The solution of those equations can be obtained by different numerical methods. In this context, this work seeks to contrast results obtained by finite difference method (FDM), the method of characteristics (MOC) and finite elements method (FEM) solutions for the water hammer problem. Those numerical methods were implemented and used to solve a simple system, which are composed of an infinite reservoir, a pipeline and a valve. In this case the valve is closed, originating the water hammer phenomenon. Although it can be considered a simple problem, it allows the evaluation of those numerical methods. Performance, convergence and accuracy were evaluated in order to support the choice of the best numerical method for the development of a numerical simulator used in complex and greater pipeline system design. Copyright © 2012 by ASME.7PARTS A, B, C, D513521Caetano, E.F., Do Vale, O.R., Torres, F.R., Silva, J.A., Field experience with multiphase boosting systems at campos basin Brazil (2005) Proc. 2005 Offshore Technology Conference, , Houston, USAShiguemoto, D.A., Tsukada, R.I., Mastelaro, V.R., Mendes, J.R.P., Serapião, A.B.S., Estevam, V., Numerical simulation of an oil and gas subsea separation and pumping system for offshore petroleum production using the method of characteristics (2011) Proc. 21st International Congress of Mechanical Engineering, , Natal, BrazilWylie, E.B., Streeter, V.L., (1993) Fluid Transients in Systems, , Prentice Hall, New Jersey, EUATsukada, R.I., Flora, B.F., Gigli, A.C.S., Mendes, J.R.P., Serapião, A.B.S., Análise dos cálculos do golpe de aríete em dutos utilizando os métodos das diferenças finitas e método das características (2012) Proc. 7th Congresso Nacional de Engenharia Mecânica, , (in Portuguese), Maranhão, BrazilShiliang, Z., Zhenhu, M., A new mathematical model and using finite difference methods to simulate pipeline water hammer (2011) Proc. 2011 IEEE International Conference on Computer Science and Automation Engineering (CSAE), , Xangai, ChinaSzymkiewicz, R., Mitosek, M., Analysis of unsteady pipe flow using the modified finite element method (2005) Commun. Numer. Meth. Engng, 21, pp. 183-199LeVeque, R.J., Finite difference methods for ordinary and partial differential equations: Steady-state and time-dependent problems (1955) Society for Industrial and Applied Mathematics, , Philadelphia, EUAVitkovsky, J.P., Bergant, A., Simpson, A.R., Lambert, M.F., Systematic evaluation of one-dimensional unsteady friction models in simple pipelines (2006) J. Hydraul. Eng., p. 132Joukowsky, N.E., (1898) Memoirs of the Imperial Academy Society of St. Petersburg, 9 (5), pp. 341-424. , (Russian translated by O Simin 1904), Proceedings of the Amer. Water Works Assoc. 24Allievi, L., Teoria del colpo d'ariete (1913) Atti Collegio Ing. Arch, , (English translation by Halmos EE 1929), The Theory of Waterhammer, " Trans. ASM
Classification Of Petroleum Well Drilling Operations Using Support Vector Machine (svm)
No full textDuring the petroleum well drilling operation many mechanical and hydraulic parameters are monitored by an instrumentation system installed in the rig called a mud-logging system. These sensors, distributed in the rig, monitor different operation parameters such as weight on the hook and drillstring rotation. These measurements are known as mud-logging records and allow the online following of all the drilling process with well monitoring purposes. However, in most of the cases, these data are stored without taking advantage of all their potential. On the other hand, to make use of the mud-logging data, an analysis and interpretationt is required. That is not an easy task because of the large volume of information involved. This paper presents a Support Vector Machine (SVM) used to automatically classify the drilling operation stages through the analysis of some mud-logging parameters. In order to validate the results of SVM technique, it was compared to a classification elaborated by a Petroleum Engineering expert. © 2006 IEEE.Burges, C.J.C., A tutorial on support vector machines for pattern recognition (1998) Data Mining and Knowledge Discovery, 2 (2), pp. 1-47Cristianini, N., Shawe-Taylor, J., (2000) An Introduction to support vector machines and other kernel-based learning methods, , Cambridge University Press, CambridgeHsu, C.-W., Lin, C.-J., A comparison of methods for multi-class support vector machines (2002) IEEE Transactions on Neural Networks, 13 (2), pp. 415-425Kyllingstad, A., Horpestad, J.L., Klakegg, S., Kristiansen, A., Aadnoy, B.S., Factors Limiting the Quantitative Use of Mud-Logging Data (1993) Proceedings of the SPE Asia Pacific Oil and Gas Conference, , SingaporeYue, Z.Q., Lee, C.F., Law, K., Tham, L.G., Automatic monitoring of rotary-percussive drilling for ground characterization - illustrated by a case example in Hong Kong (2003) International Journal of Rock Mechanics & Mining Sciences, 41, pp. 573-612Tavares, R.M., Mendes, J.R.P., Morooka, C.K., Plácido, J.C.R., Automated Classification System for Petroleum Well Drilling using Mud-Logging Data (2005) 18th International Congress of Mechanical Engineer, , Offshore & Petroleum and Engineering, Ouro PretoVapnik, V., (1998) Statistical Learning Theory, , John Wiley & Son
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Isothermal And Non-isothermal Transient Gas Flow In Submarine Pipeline
No full textThe discoveries of the Pre-salt oilfields have driven the development of new technologies to enable the production of the deepwater reservoirs. In this scenario, subsea pipelines play an important role. Analysis of the steady and transient flow inside the pipes should be addressed in the design, considering the variation of the fluid properties. In this context, a pipe flow simulator project has been developed to attend gas flow analysis for petroleum industry. In this project, the fluid compressibility factor (Z-factor) and the viscosity are considered function of the pressure, temperature and gas composition. The non-isothermal transient gas flow were calculated using the Method of Characteristics (MOC). The results shown the difference of the isothermal and non-isothermal steady state and transient flow. © 2015 by ASME.10Londono, F.E., Archer, R.A., Blasingame, T.A., Correlations for hydrocarbon-gas viscosity and gas density: Validation and correlation of behavior using a large-scale database (2005) SPE Reservoir Evaluation and Engineering, , DecemberLee, A.L., Gonzales, M.H., Eakin, B.E., The viscosity of natural gases (1966) Journal of Petroleum Technology, , AugustMelo, A.V., Mendes, J.R.P., Serapião, A., Veras, A., Unicamp, D.M., Ricardo, J., Unicamp, P.M., Unesp, A.B.D.S.S.A., Controle inteligente supervisor para o separador VASPS (2007) 4ž DPPETRO ÂA Ş Associação Brasileira de Petróleo e Gás., 1, pp. 1-10Ricardo, J., Mendes, P., Tsukada, R.I.L., Shiguemoto, D.A., Mastelaro, V.R., Mendes, J.R.P., Serapiao, A.B.S., Estevam, V., (2011) Numerical Simulation of An Oil and Gas Subsea Separation and Pumping System for Offshore Petroleum Production Using the Method of Characteristics, , 21st Brazilian Congress of Mechanical EngineeringNalin, A.F., Shiguemoto, D.A., Tsukada, R.I., Serapião, A.S.B., Mendes, J.R.P., Beatriz, A., Serapião, D.S., Natural gas properties evaluation for pipe flow simulation (2013) 22nd International Congress of Mechanical EngineeringDranchuk, P.M., Abou-Kassem, J.H., Calculation of z-factor for natural gases using equations of state (1975) J. Can. of Pet. Tech., pp. 34-36. , July-SeptWylie, E.B., Streeter, V.L., Suo, L., (1993) Fluid Transients in Systems, , Prentice HallFlora, B.F., Tsukada, R.I., Rodrigues, V.M., Mendes, J.R.P., Serapião, A.S.B., (2012) Evaluation of Numerical Methods Applied in the Analysis of the Transient Flow of Pipeline Systems, 7, p. 513. , Fluids and Heat Transfer, Parts A, B C, and D, ASMEYow, W., Numerical error on natural gas transient calculations (1972) Journal of Basic Engineering, 94 (2), p. 422. , JuneOsiadacz, A.J., Chaczykowski, M., Comparison of isothermal and non-isothermal pipeline gas flow models (2001) Chemical Engineering Journal, 81 (1-3), pp. 41-51. , JanASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 201531 May 2015 through 5 June 201
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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