ISO/TR TECHNICAL REPORT 26762 First edition 2008-07-15 Natural gas Upstream area Allocation of gas and condensate Gaz naturel - Zone amont - Allocation du gaz et du condensat Reference number ISO/TR 26762:2008(E) ISO2008 Tby IHS under lic itted without license from IHS Not for Resale ISO/TR 26762:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below COPYRIGHTPROTECTEDDOCUMENT @ ISO2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's member body in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISo 2008 - Allrights reserved ed without license from IHS Not for Resale ISO/TR 26762:2008(E) Contents Page Foreword. Introduction 1 Scope 2 Normative references . 3 Economic aspects 3.1 Overview.... 3.2 Uncertainty and costs, 3.3 Allocation system overview..... 4 Allocation from different viewpoints and terminology . 4.1 Physical system... 4.2 Gas/condensate system overview .... 4.3 Physical system terms.......... 12 4.4 Definitions for allocation systems .. 4.5 Allocation from a commercial viewpoint.. 16 5 Quantity measurement for gas and condensate .. 21 5.1 Introduction..... 21 5.2 Quantity measurement by type of fluid streams . 6 Quality measurement .... 6.1 Sampling and analysis . 33 6.2 Analysis... 35 6.3 Uncertainties .35 6.4 7 7.1 Calculation at the measurement point.. .38 7.2 Balancing and reconciliation.... 39 7.3 .40 7.4 Line packing and stock change, 41 8 Lift, injection and utility gas . 8.1 General. 42 8.2 Lift gas 42 8.3 Injectiongas 8.4 Utility gas .. 43 8.5 Uncertainty considerations for lift, injection and utility gas.. 44 9 Uncertainty General considerations .45 9.1 Economicconsequences. .45 9.2 Sensitivity..... 9.3 Allocation principle.. .48 9.4 Uncertainty determination 48 10 Validation... .49 10.1 General. .49 10.2 Meter validation.... .49 10.3 Allocation procedures and process validation... .50 10.4 .50 10.5 Process-model validation ... 10.6 Allocation-process results validation .50 10.7 Software validation... 50 Copyrght Internatinal Organizaionforsandardizalon'ghts reserved ili ut license from IHS Not for Resale ISO/TR 26762:2008(E) 11 Classification of allocation processes.... 51 11.1 General descriptions and calculations, 51 11.2 Allocation systems layout.... 60 12 Mis-measurements - Measurement-correction and estimations. ..65 Annex A (informative) Adjust for impurities ..66 Annex B (informative) Adjustments for fuel/utilitylvent/flare gas . ..67 Annex c (informative) Wet gas.. 68 Annex D (informative) Codes, abbreviations and acronyms ..71 Annex E (informative) Conversion of molar percent to mass percent. ..73 Annex F (informative) Conversion of mole percent to per cent of the calorific value... ..74 Annex G (informative) Conversion of mole per cent to volume percent 75 Annex H (informative) Components of gas and liquid reported.. 76 Bibliography .... @ Iso 2008-All rights reserved Not for Resale ISO/TR 26762:2008(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work