This work considers the problem of the optimal design of an hydrogen transmission network. This design problem includes the topology determina tion and the pipelines dimensioning problem. We define a local search method that simultaneously looks for the least cost topology of the network and for the optimal diameter of each pipe. These two problems were generally solved separately these last years. The application to the case of development of future hydrogen pipeline networks in France has been conducted at the local, regional and national levels. We compare the proposed approach with another using Tabu search heuristic.

Offshore transportation of gaseous fluids frequently relies on flexible pipes. Flexible pipes are obtained from the helicoidal rolling of steel tape which induces a geometrical cavity from edge to edge. Along the pipe, the gas infinitely encounters the edge to edge cavity of the same shape at regular interval. In some service conditions, acoustic vibrations of huge amplitude can arise. Indeed, in front of each cavity, there is a shear layer where Kelvin-Helmholtz instability can occur. The flow encounters a large number of cavities on its path which gives rise to a new specific problem: is there a stabilized flow?Results of large eddy scale simulations are presented as a reference but they are very costly. This gives reason to develop a numerical solution of the Orr-Sommerfeld equation in order to analyze the temporal and spatial wave lengths generated by the shear layers in front of the cavities.First, we introduce the problem of flexible risers and the analysis of some RANS and LES modeling. Second, a bibliographical study describes the state of the art about vibrations induced by cavity. Third, we state the Orr-Sommerfeld equation and set the problem we want to solve in terms of generalized eigen values Numerical discretizations are based on finite difference approaches of fourth orders. The choice of the relevant eigen values among all those provided by the solutions of the numerical problem is the main difficulty to be tackled.

This work considers the problem of the optimal design of an hydrogen transmission network. This design problem includes the topology determination and the dimensioning problem. We dene a solution method that simultaneously looks for the least cost topology of the network and for the optimal diameter of each pipe. These two problems were generally solved separately these last years. The application to the case of development of future hydrogen pipeline networks in France has been conducted on several urban areas.

Vortex or eddy identification is still a complex problem from both the experimental and the theoretical standpoints. The different intuitive and mathematical criteria used to identify vortices are reviewed and observations are made about the weaknesses of most of the criteria. Jeong & Hussain [10] define a new method based on a mathematical criterion. We propose improving this method to yield a simple, accurate and suitable vortex definition. It is successfully applied to an unstable shear layer over a cavity in a pipe. In addition, a link between the vortex criterion and acoustic sources as defined by Lighthill is emphasized.

Multiphase pumping receive now a widespread acceptance of the oil industry. The paper describes the state of the art performance of the helico-axial technology invented and developed by the Institut francais du petrole (IFP). The size of the installed pumps has considerably increased as the industry gained confidence with the accumulation of field experience, both onshore and offshore. A single pump can rate up to 6 MW to-date, and helico-axial pumps are the largest multiphase pumps manufactured in the world. Further research works are still performed at IFP to improve the helico-axial pump performance but also to develop new applications of multiphase turbomachines: sour gas re-injection in solution, wet gas compressors, two-phase turbines. The paper describes the main axes of works and the methodologies applied for these developments. The most advanced experimental and computational techniques are used: laser Doppler anemometry on the experimental side, two-phase CFD simulation and shape optimisation by neural network and genetic algorithm on the design and calculation side.

the section must tit the impedance logs available at several well locations; consistency of the interpretation. A similar approach has been proposed by Gelfand and Lamer (1984). It can be used to check a lithological model guessed by the interpreter or to improve it for a better fit between synthetic and observed seismic sections, Our method relies ona quite different strategy and has advantages that will be emphasized in the following.

PreviousNext No AccessSEG Technical Program Expanded Abstracts 1988Wavelet analysis using well log informationAuthors: Vincent RichardJean BracVincent RichardInstitut Francaise du Petrole, France and Jean BracInstitut Francaise du Petrole, Francehttps://doi.org/10.1190/1.1892398 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InReddit Permalink: https://doi.org/10.1190/1.1892398FiguresReferencesRelatedDetailsCited byBayesian wavelet estimation from seismic and well dataArild Buland and Henning Omre20 November 2003 | GEOPHYSICS, Vol. 68, No. 6Wavelets, well ties, and the search for subtle stratigraphic trapsAnton Ziolkowski, John R. Underhill, and Rodney G. K. Johnston7 February 2012 | GEOPHYSICS, Vol. 63, No. 1Getting Better Quality Seismic Sections SEG Technical Program Expanded Abstracts 1988ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 1988 Pages: 1359 publication data© 1988 Copyright © 1988 Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 10 Feb 2005 CITATION INFORMATION Vincent Richard and Jean Brac, (1988), "Wavelet analysis using well log information," SEG Technical Program Expanded Abstracts : 946-949. https://doi.org/10.1190/1.1892398 Plain-Language Summary PDF DownloadLoading ...